Ismael Martel Bravo - Huelva University (original) (raw)
Papers by Ismael Martel Bravo
We studied the reaction dynamics induced at Coulomb barrier energies by the weakly-bound Radioact... more We studied the reaction dynamics induced at Coulomb barrier energies by the weakly-bound Radioactive Ion Beam 7 Be (S α = 1.586 MeV) on medium-mass (58 Ni) and heavy (208 Pb) targets. The experiments were performed at INFN-LNL (Italy), where a 2-3×10 5 pps 7 Be secondary beam was produced with the RIB in-flight facility EXOTIC. Charged reaction products were detected by means of high-granularity silicon detectors in rather wide angular ranges. The contribution presents an up-to-date status of the data analysis and theoretical interpretation for both systems.
Centro Científico Tecnológico de Huelva, 2019
Theranostic, has positioned itself as a promising technique to fight cancer, especially when usin... more Theranostic, has positioned itself as a promising technique to fight cancer, especially when using radioactive isotopes, where it has demonstrated good efficiency in human cancer treatment and in the animal phase study. The technique basically consists in using a chemical element with several radioactive isotopes. One diagnostic (gamma or β+ emitter) and another isotope of the same therapeutic element (alpha, β+, β-or Auger electrons). These isotopes must be linked to a vector molecule expressed by the tumor cells of the corresponding type of cancer. Radioisotopes can also be encapsulated in nanoparticles.
Near-barrier scattering of [sup 6]He and [sup 11]Be
AIP Conference Proceedings, 2008
Experiments on halo nuclei at energies around the Coulomb barrier can provide good quality data o... more Experiments on halo nuclei at energies around the Coulomb barrier can provide good quality data on elastic, inelastic, breakup and nucleon transfer reactions. This information turns out to be very important to understand the structure and dynamics of these exotic nuclei. In this work we present relevant results obtained from recent scattering experiments of 11Be and 6He on heavy targets
The University of Huelva is presently involved in R&D projects for developing RF accelerator cavi... more The University of Huelva is presently involved in R&D projects for developing RF accelerator cavities. Two types of cavities are presently under design, a prototype of room temperature RFQ injector and a quarter-wave resonator for high intensity heavy-ion linear accelerators. The laboratory is equipped with dedicated test-bench for RF measurements, which includes high-power RF generators, network analyzer, amplifiers and power meters. A clean room is also available having a dedicated space for high-precision mechanical metrology and cavity mounting, together with a vertical cryostat for superconducting cavity test.
A new frontier: neutron-shell structure below Pb along N=127 isotone via the 206 Hg(d,p) reaction
APS April Meeting Abstracts, 2019
Elastic scattering measurements for the system 7Be+28Si at 17.2 MeV
AIP Conference Proceedings, 2015
Elastic scattering of {sup 7}Be+{sup 28}Si was studied at several near barrier energies for probi... more Elastic scattering of {sup 7}Be+{sup 28}Si was studied at several near barrier energies for probing the energy dependence of the optical potential. Our analysis at 17.2 MeV will be presented in this article and discussed, in terms of Continuum Coupled Channel Calculations (CDCC). This research is part of a long term plan concerning the energy dependence of the optical potential for weakly bound projectiles, at near barrier energies and for probing the potential threshold anomaly. The experiment took place at the EXOTIC facility - Laboratori Nationali di Legnaro (LNL), and refers to an angular distribution measurement, using the detector array EXPADES (Exotic Particle Detection System). Results at 9 MeV (Rutherford region) were also analyzed and were used for estimating the solid angle. Our analysis for other energies is under process.
The low-energy part of the LINCE facility [1] can be based on a 72.75 MHz normal-conducting RFQ d... more The low-energy part of the LINCE facility [1] can be based on a 72.75 MHz normal-conducting RFQ designed to give a 450 keV/u boost for A/Q=7 ions in about 5 m length. The vanes have been electromagnetically designed to accommodate dedicated RF windows producing effective separation of the RFQ modes in an octagonal-shaped resonance chamber [2]. This article outlines the optimization of the quality factor of the cavity by using numerical methods for electromagnetic calculations. Experimental results of RF test carried out on a prototype are also discussed.
Journal of Physics: Conference Series, 2018
In this contribution we describe the first results obtained for the investigation of the elastic ... more In this contribution we describe the first results obtained for the investigation of the elastic scattering process in the reactions induced by the Radioactive Ion Beams 7 Be and 8 B on a 208 Pb target at Coulomb barrier energies. The experimental data were analyzed within the framework of the optical model in order to extract the total reaction cross section. The comparison with data available in literature for reactions induced on 208 Pb by light ions in the mass range A = 6-8 shows that the loosely-bound 8 B has the largest reactivity.
Physical Review C, 2018
Angular distributions for the inclusive 4 He and 6 He production cross sections in the 8 He + 208... more Angular distributions for the inclusive 4 He and 6 He production cross sections in the 8 He + 208 Pb system at incident energies of 16 and 22 MeV measured at the SPIRAL facility of the GANIL laboratory are presented. Using a combination of kinematical arguments and distorted wave Born approximation (DWBA) calculations, neutron transfer reactions were inferred to be the dominant contributors to both inclusive cross sections. Modeldependent values for the ratios of two-to one-neutron stripping, σ 2n /σ 1n , were derived and compared with previous results for 8 He and 6 He projectiles incident on other heavy targets. Three-and four-neutron stripping were inferred to be the main processes leading to 4 He production, although the exact mechanism remains to be elucidated.
EPJ Web of Conferences, 2019
Elastic scattering and breakup angular distribution measurements for the systems 6,7Li + p were p... more Elastic scattering and breakup angular distribution measurements for the systems 6,7Li + p were performed at the MAGNEX facility of the Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (INFN-LNS) in Catania, in the energy range of (2.3–5.4)AMeV. The breakup channel was identified and quantified adopting the algorithm MULTIP.Within this algorithm which is a Monte Carlo simulation code, the history of the breakup fragments can be tagged from the rest frame of the decay nucleus itself to the laboratory frame. Angular distribution data of both elastic scattering and breakup were analyzed under the same theoretical model and the influence of continuum on the elastic channel was investigated.
Physical Review C, 2018
Several states of proton-unbound isotopes 30 Ar and 29 Cl were investigated by measuring their in... more Several states of proton-unbound isotopes 30 Ar and 29 Cl were investigated by measuring their in-flight decay products, 28 S+proton+proton and 28 S+proton, respectively. A refined analysis of 28 S-proton angular correlations indicates that the ground state of 30 Ar is located at 2.45 +0.05 −0.10 MeV above the two-proton emission threshold. The theoretical investigation of the 30 Ar ground state decay demonstrates that its mechanism has the transition dynamics with a surprisingly strong sensitivity of the correlation patterns of the decay products to the two-proton decay energy of the 30 Ar ground state and the one-proton decay energy as well as the one-proton decay width of the 29 Cl ground state. The comparison of the experimental 28 S-proton angular correlations with those resulting from Monte Carlo simulations of the detector response illustrates that other observed 30 Ar excited states decay by sequential emission of protons via intermediate resonances in 29 Cl. Based on the findings, the decay schemes of the observed states in 30 Ar and 29 Cl were constructed. For calibration purposes and for checking the performance of the experimental setup, decays of the previously-known states of a two-proton emitter 19 Mg were remeasured. Evidences for one new excited state in 19 Mg and two unknown states in 18 Na were found.
Journal of Physics: Conference Series, 2017
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
EPJ Web of Conferences, 2016
Two and multi particle correlations from the decay of sources produced in 12 C+ 24 Mg and 12 C+ 2... more Two and multi particle correlations from the decay of sources produced in 12 C+ 24 Mg and 12 C+ 208 Pb collisions at E=35 AM eV have been studied by using the forward part (1 o < θ lab < 30 o) of the CHIMERA multi-detector. Correlations and invariant mass spectroscopy are used to explore simultaneous and sequential decays of resonances in light isotopes with Z∼3-6, produced in peripheral collisions via the break-up of excited quasi-projectiles. Among them we mention 5 Li, 6 Li, 6 Be, 8 Be and the astrophysically important state in 12 C decaying into three alpha particles. Results and future perspectives at the INFN-LNS will be presented.
Physical Review C, 2017
Angular distribution measurements were performed at each energy with the multidetector array EXPA... more Angular distribution measurements were performed at each energy with the multidetector array EXPADES in conjunction with two Parallel-Plate Avalanche Counters (PPAC) to enable beam ray reconstruction of the events. The data are analyzed in a double-folding framework and the energy evolution of the optical potential as well as the total reaction cross sections are deduced and discussed.
Physical Review C, 2016
Elastic scattering measurements were performed for the 7 Li +p system in inverse kinematics at en... more Elastic scattering measurements were performed for the 7 Li +p system in inverse kinematics at energies of 16, 25, 35, and 38.1 MeV and for the 7 Li +d system at 38.1 MeV. The heavy ejectiles were detected by the large acceptance MAGNEX spectrometer at the Laboratori Nazionali del Sud in Catania, Italy. The results are analyzed using the Jeukenne-Lejeune-Mahaux and continuum discretized coupled channel frameworks. In the latter case the cluster structure of 7 Li proves to be critical for the theoretical interpretation of the experimental results.
Physical Review C, 2017
An exclusive measurement of the breakup of 7 Li incident on a proton target was performed at 38.1... more An exclusive measurement of the breakup of 7 Li incident on a proton target was performed at 38.1 MeV (5.44 MeV/nucleon), probing the direct part of the excitation to the continuum. The two cluster constituents of 7 Li, 4 He, and 3 H, were recorded in coincidence in the MAGNEX spectrometer and a silicon detector respectively. Both detection systems were set at forward angles and the measurement of both kinematical solutions allowed the determination of a breakup angular distribution over a wide angular range in the center-of-mass frame. Comprehensive simulations provided the detection efficiency of the system and via the appropriate kinematics the transformation of the cross sections from the laboratory to the center-of-mass reference frame. The experimental results are analyzed and discussed together with previous elastic scattering data using the Continuum Discretized Coupled Channels (CDCC) framework and are found to be in satisfactory agreement. It was found that while the breakup cross section was dominated by the nonresonant component, the most important influence on the elastic scattering was due to coupling to the 7/2 − resonance of 7 Li.
Physical review letters, Jan 14, 2017
Angular distributions of the elastic, inelastic, and breakup cross sections of the halo nucleus ^... more Angular distributions of the elastic, inelastic, and breakup cross sections of the halo nucleus ^{11}Be on ^{197}Au were measured at energies below (E_{lab}=31.9 MeV) and around (39.6 MeV) the Coulomb barrier. These three channels were unambiguously separated for the first time for reactions of ^{11}Be on a high-Z target at low energies. The experiment was performed at TRIUMF (Vancouver, Canada). The differential cross sections were compared with three different calculations: semiclassical, inert-core continuum-coupled-channels and continuum-coupled-channels ones with including core deformation. These results show conclusively that the elastic and inelastic differential cross sections can only be accounted for if core-excited admixtures are taken into account. The cross sections for these channels strongly depend on the B(E1) distribution in ^{11}Be, and the reaction mechanism is sensitive to the entanglement of core and halo degrees of freedom in ^{11}Be.
Acta Physica Polonica B, 2016
The structure and dynamics of 8 He have been studied through the collision process with a 208 Pb ... more The structure and dynamics of 8 He have been studied through the collision process with a 208 Pb target at energies of 22 and 16 MeV, above and below the Coulomb barrier, respectively. The energy and angular distributions of the elastically scattered 8 He and the 6,4 He fragments were measured. In this paper, we discuss the method used to determine the effective position of the beam spot on the reaction target and the scattering and solid angles of each pixel of the detector array.
EPJ Web of Conferences, 2016
We investigated the reaction dynamics induced by the Radioactive Ion Beams 7 Be and 8 B on a 208 ... more We investigated the reaction dynamics induced by the Radioactive Ion Beams 7 Be and 8 B on a 208 Pb target at energies around the Coulomb barrier. The two measurements are strongly interconnected, being 7 Be (S α = 1.586 MeV) the loosely bound core of the even more exotic 8 B (S p = 0.1375 MeV) nucleus. Here we summarize the present status of the data analysis for the measurement of the elastic scattering process for both reactions and the preliminary results for the optical model analysis of the collected data.
Physics Letters B, 2015
The strength functions of the π f 5/2 , πp 3/2 and π f 7/2 orbitals in neutron-rich 71 Cu were ob... more The strength functions of the π f 5/2 , πp 3/2 and π f 7/2 orbitals in neutron-rich 71 Cu were obtained in a 72 Zn(d, 3 He) 71 Cu proton pickup reaction in inverse kinematics using a radioactive beam of 72 Zn at 38 MeV/u. A dedicated setup was developed to overcome the experimental challenges posed by the low cross section of the reaction and the low energy of the outgoing 3 He particles. The excitation-energy spectrum was reconstructed and spectroscopic factors were obtained after analysis of the angular distributions with the finite-range Distorted-Wave Born Approximation (DWBA). The results show that unlike for the π f 5/2 orbital and contrary to earlier interpretation, the π f 7/2 single-particle strength distribution is not appreciably affected by the addition of neutrons beyond N = 40.
We studied the reaction dynamics induced at Coulomb barrier energies by the weakly-bound Radioact... more We studied the reaction dynamics induced at Coulomb barrier energies by the weakly-bound Radioactive Ion Beam 7 Be (S α = 1.586 MeV) on medium-mass (58 Ni) and heavy (208 Pb) targets. The experiments were performed at INFN-LNL (Italy), where a 2-3×10 5 pps 7 Be secondary beam was produced with the RIB in-flight facility EXOTIC. Charged reaction products were detected by means of high-granularity silicon detectors in rather wide angular ranges. The contribution presents an up-to-date status of the data analysis and theoretical interpretation for both systems.
Centro Científico Tecnológico de Huelva, 2019
Theranostic, has positioned itself as a promising technique to fight cancer, especially when usin... more Theranostic, has positioned itself as a promising technique to fight cancer, especially when using radioactive isotopes, where it has demonstrated good efficiency in human cancer treatment and in the animal phase study. The technique basically consists in using a chemical element with several radioactive isotopes. One diagnostic (gamma or β+ emitter) and another isotope of the same therapeutic element (alpha, β+, β-or Auger electrons). These isotopes must be linked to a vector molecule expressed by the tumor cells of the corresponding type of cancer. Radioisotopes can also be encapsulated in nanoparticles.
Near-barrier scattering of [sup 6]He and [sup 11]Be
AIP Conference Proceedings, 2008
Experiments on halo nuclei at energies around the Coulomb barrier can provide good quality data o... more Experiments on halo nuclei at energies around the Coulomb barrier can provide good quality data on elastic, inelastic, breakup and nucleon transfer reactions. This information turns out to be very important to understand the structure and dynamics of these exotic nuclei. In this work we present relevant results obtained from recent scattering experiments of 11Be and 6He on heavy targets
The University of Huelva is presently involved in R&D projects for developing RF accelerator cavi... more The University of Huelva is presently involved in R&D projects for developing RF accelerator cavities. Two types of cavities are presently under design, a prototype of room temperature RFQ injector and a quarter-wave resonator for high intensity heavy-ion linear accelerators. The laboratory is equipped with dedicated test-bench for RF measurements, which includes high-power RF generators, network analyzer, amplifiers and power meters. A clean room is also available having a dedicated space for high-precision mechanical metrology and cavity mounting, together with a vertical cryostat for superconducting cavity test.
A new frontier: neutron-shell structure below Pb along N=127 isotone via the 206 Hg(d,p) reaction
APS April Meeting Abstracts, 2019
Elastic scattering measurements for the system 7Be+28Si at 17.2 MeV
AIP Conference Proceedings, 2015
Elastic scattering of {sup 7}Be+{sup 28}Si was studied at several near barrier energies for probi... more Elastic scattering of {sup 7}Be+{sup 28}Si was studied at several near barrier energies for probing the energy dependence of the optical potential. Our analysis at 17.2 MeV will be presented in this article and discussed, in terms of Continuum Coupled Channel Calculations (CDCC). This research is part of a long term plan concerning the energy dependence of the optical potential for weakly bound projectiles, at near barrier energies and for probing the potential threshold anomaly. The experiment took place at the EXOTIC facility - Laboratori Nationali di Legnaro (LNL), and refers to an angular distribution measurement, using the detector array EXPADES (Exotic Particle Detection System). Results at 9 MeV (Rutherford region) were also analyzed and were used for estimating the solid angle. Our analysis for other energies is under process.
The low-energy part of the LINCE facility [1] can be based on a 72.75 MHz normal-conducting RFQ d... more The low-energy part of the LINCE facility [1] can be based on a 72.75 MHz normal-conducting RFQ designed to give a 450 keV/u boost for A/Q=7 ions in about 5 m length. The vanes have been electromagnetically designed to accommodate dedicated RF windows producing effective separation of the RFQ modes in an octagonal-shaped resonance chamber [2]. This article outlines the optimization of the quality factor of the cavity by using numerical methods for electromagnetic calculations. Experimental results of RF test carried out on a prototype are also discussed.
Journal of Physics: Conference Series, 2018
In this contribution we describe the first results obtained for the investigation of the elastic ... more In this contribution we describe the first results obtained for the investigation of the elastic scattering process in the reactions induced by the Radioactive Ion Beams 7 Be and 8 B on a 208 Pb target at Coulomb barrier energies. The experimental data were analyzed within the framework of the optical model in order to extract the total reaction cross section. The comparison with data available in literature for reactions induced on 208 Pb by light ions in the mass range A = 6-8 shows that the loosely-bound 8 B has the largest reactivity.
Physical Review C, 2018
Angular distributions for the inclusive 4 He and 6 He production cross sections in the 8 He + 208... more Angular distributions for the inclusive 4 He and 6 He production cross sections in the 8 He + 208 Pb system at incident energies of 16 and 22 MeV measured at the SPIRAL facility of the GANIL laboratory are presented. Using a combination of kinematical arguments and distorted wave Born approximation (DWBA) calculations, neutron transfer reactions were inferred to be the dominant contributors to both inclusive cross sections. Modeldependent values for the ratios of two-to one-neutron stripping, σ 2n /σ 1n , were derived and compared with previous results for 8 He and 6 He projectiles incident on other heavy targets. Three-and four-neutron stripping were inferred to be the main processes leading to 4 He production, although the exact mechanism remains to be elucidated.
EPJ Web of Conferences, 2019
Elastic scattering and breakup angular distribution measurements for the systems 6,7Li + p were p... more Elastic scattering and breakup angular distribution measurements for the systems 6,7Li + p were performed at the MAGNEX facility of the Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (INFN-LNS) in Catania, in the energy range of (2.3–5.4)AMeV. The breakup channel was identified and quantified adopting the algorithm MULTIP.Within this algorithm which is a Monte Carlo simulation code, the history of the breakup fragments can be tagged from the rest frame of the decay nucleus itself to the laboratory frame. Angular distribution data of both elastic scattering and breakup were analyzed under the same theoretical model and the influence of continuum on the elastic channel was investigated.
Physical Review C, 2018
Several states of proton-unbound isotopes 30 Ar and 29 Cl were investigated by measuring their in... more Several states of proton-unbound isotopes 30 Ar and 29 Cl were investigated by measuring their in-flight decay products, 28 S+proton+proton and 28 S+proton, respectively. A refined analysis of 28 S-proton angular correlations indicates that the ground state of 30 Ar is located at 2.45 +0.05 −0.10 MeV above the two-proton emission threshold. The theoretical investigation of the 30 Ar ground state decay demonstrates that its mechanism has the transition dynamics with a surprisingly strong sensitivity of the correlation patterns of the decay products to the two-proton decay energy of the 30 Ar ground state and the one-proton decay energy as well as the one-proton decay width of the 29 Cl ground state. The comparison of the experimental 28 S-proton angular correlations with those resulting from Monte Carlo simulations of the detector response illustrates that other observed 30 Ar excited states decay by sequential emission of protons via intermediate resonances in 29 Cl. Based on the findings, the decay schemes of the observed states in 30 Ar and 29 Cl were constructed. For calibration purposes and for checking the performance of the experimental setup, decays of the previously-known states of a two-proton emitter 19 Mg were remeasured. Evidences for one new excited state in 19 Mg and two unknown states in 18 Na were found.
Journal of Physics: Conference Series, 2017
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
EPJ Web of Conferences, 2016
Two and multi particle correlations from the decay of sources produced in 12 C+ 24 Mg and 12 C+ 2... more Two and multi particle correlations from the decay of sources produced in 12 C+ 24 Mg and 12 C+ 208 Pb collisions at E=35 AM eV have been studied by using the forward part (1 o < θ lab < 30 o) of the CHIMERA multi-detector. Correlations and invariant mass spectroscopy are used to explore simultaneous and sequential decays of resonances in light isotopes with Z∼3-6, produced in peripheral collisions via the break-up of excited quasi-projectiles. Among them we mention 5 Li, 6 Li, 6 Be, 8 Be and the astrophysically important state in 12 C decaying into three alpha particles. Results and future perspectives at the INFN-LNS will be presented.
Physical Review C, 2017
Angular distribution measurements were performed at each energy with the multidetector array EXPA... more Angular distribution measurements were performed at each energy with the multidetector array EXPADES in conjunction with two Parallel-Plate Avalanche Counters (PPAC) to enable beam ray reconstruction of the events. The data are analyzed in a double-folding framework and the energy evolution of the optical potential as well as the total reaction cross sections are deduced and discussed.
Physical Review C, 2016
Elastic scattering measurements were performed for the 7 Li +p system in inverse kinematics at en... more Elastic scattering measurements were performed for the 7 Li +p system in inverse kinematics at energies of 16, 25, 35, and 38.1 MeV and for the 7 Li +d system at 38.1 MeV. The heavy ejectiles were detected by the large acceptance MAGNEX spectrometer at the Laboratori Nazionali del Sud in Catania, Italy. The results are analyzed using the Jeukenne-Lejeune-Mahaux and continuum discretized coupled channel frameworks. In the latter case the cluster structure of 7 Li proves to be critical for the theoretical interpretation of the experimental results.
Physical Review C, 2017
An exclusive measurement of the breakup of 7 Li incident on a proton target was performed at 38.1... more An exclusive measurement of the breakup of 7 Li incident on a proton target was performed at 38.1 MeV (5.44 MeV/nucleon), probing the direct part of the excitation to the continuum. The two cluster constituents of 7 Li, 4 He, and 3 H, were recorded in coincidence in the MAGNEX spectrometer and a silicon detector respectively. Both detection systems were set at forward angles and the measurement of both kinematical solutions allowed the determination of a breakup angular distribution over a wide angular range in the center-of-mass frame. Comprehensive simulations provided the detection efficiency of the system and via the appropriate kinematics the transformation of the cross sections from the laboratory to the center-of-mass reference frame. The experimental results are analyzed and discussed together with previous elastic scattering data using the Continuum Discretized Coupled Channels (CDCC) framework and are found to be in satisfactory agreement. It was found that while the breakup cross section was dominated by the nonresonant component, the most important influence on the elastic scattering was due to coupling to the 7/2 − resonance of 7 Li.
Physical review letters, Jan 14, 2017
Angular distributions of the elastic, inelastic, and breakup cross sections of the halo nucleus ^... more Angular distributions of the elastic, inelastic, and breakup cross sections of the halo nucleus ^{11}Be on ^{197}Au were measured at energies below (E_{lab}=31.9 MeV) and around (39.6 MeV) the Coulomb barrier. These three channels were unambiguously separated for the first time for reactions of ^{11}Be on a high-Z target at low energies. The experiment was performed at TRIUMF (Vancouver, Canada). The differential cross sections were compared with three different calculations: semiclassical, inert-core continuum-coupled-channels and continuum-coupled-channels ones with including core deformation. These results show conclusively that the elastic and inelastic differential cross sections can only be accounted for if core-excited admixtures are taken into account. The cross sections for these channels strongly depend on the B(E1) distribution in ^{11}Be, and the reaction mechanism is sensitive to the entanglement of core and halo degrees of freedom in ^{11}Be.
Acta Physica Polonica B, 2016
The structure and dynamics of 8 He have been studied through the collision process with a 208 Pb ... more The structure and dynamics of 8 He have been studied through the collision process with a 208 Pb target at energies of 22 and 16 MeV, above and below the Coulomb barrier, respectively. The energy and angular distributions of the elastically scattered 8 He and the 6,4 He fragments were measured. In this paper, we discuss the method used to determine the effective position of the beam spot on the reaction target and the scattering and solid angles of each pixel of the detector array.
EPJ Web of Conferences, 2016
We investigated the reaction dynamics induced by the Radioactive Ion Beams 7 Be and 8 B on a 208 ... more We investigated the reaction dynamics induced by the Radioactive Ion Beams 7 Be and 8 B on a 208 Pb target at energies around the Coulomb barrier. The two measurements are strongly interconnected, being 7 Be (S α = 1.586 MeV) the loosely bound core of the even more exotic 8 B (S p = 0.1375 MeV) nucleus. Here we summarize the present status of the data analysis for the measurement of the elastic scattering process for both reactions and the preliminary results for the optical model analysis of the collected data.
Physics Letters B, 2015
The strength functions of the π f 5/2 , πp 3/2 and π f 7/2 orbitals in neutron-rich 71 Cu were ob... more The strength functions of the π f 5/2 , πp 3/2 and π f 7/2 orbitals in neutron-rich 71 Cu were obtained in a 72 Zn(d, 3 He) 71 Cu proton pickup reaction in inverse kinematics using a radioactive beam of 72 Zn at 38 MeV/u. A dedicated setup was developed to overcome the experimental challenges posed by the low cross section of the reaction and the low energy of the outgoing 3 He particles. The excitation-energy spectrum was reconstructed and spectroscopic factors were obtained after analysis of the angular distributions with the finite-range Distorted-Wave Born Approximation (DWBA). The results show that unlike for the π f 5/2 orbital and contrary to earlier interpretation, the π f 7/2 single-particle strength distribution is not appreciably affected by the addition of neutrons beyond N = 40.