Rolf Elmér - Academia.edu (original) (raw)
Papers by Rolf Elmér
Harvard Deusto Marketing Y Ventas, 2009
Un consumidor puede salir de un sitio web con la misma rapidez con la que ha entrado si no le lla... more Un consumidor puede salir de un sitio web con la misma rapidez con la que ha entrado si no le llama la atencion inmediatamente o no presenta productos o promociones relevantes que se correspondan con lo que esta buscando. Por ello, es necesario implementar prestaciones que ayuden a atraer, retener y maximizar al cliente on-line.
Physical Review Letters, 1997
ABSTRACT Slow ramping of the CELSIUS storage ring has been utilized to measure the yield of charg... more ABSTRACT Slow ramping of the CELSIUS storage ring has been utilized to measure the yield of charged pions in proton and heavy ion induced collisions with continuously varying beam energy. Boltzmann-Uehling-Uhlenbeck predictions, including Fermi momenta of nucleons in nuclei, follow the general shape of the p-nucleus excitation functions quite well except for a general overestimation of the backward emission. For heavy ion reactions the calculated yield also falls off faster with decreasing beam energy than the data. No statistically significant narrow resonances are observed.
![Research paper thumbnail of K+Emission in Symmetric Heavy Ion Reactions at Subthreshold Energies [Phys. Rev. Lett. 77, 4884 (1996)]](https://attachments.academia-assets.com/95987070/thumbnails/1.jpg)
](Physical Review Letters, 1997
The differential cross section data representing A 58 and A 20 at 85 ± and 125 ± in Fig. 4 (mid a... more The differential cross section data representing A 58 and A 20 at 85 ± and 125 ± in Fig. 4 (mid and right parts of figure) should contain the information " 3 0.1". Note that corresponding data are correctly presented in Fig. 2.
Physical Review C, 1995
Page 1. PHYSICAL REVIEW C VOLUME 51,NUMBER 5 MAY 1995 BRIEF REPORTS Brief Reports are short paper... more Page 1. PHYSICAL REVIEW C VOLUME 51,NUMBER 5 MAY 1995 BRIEF REPORTS Brief Reports are short papers which report on completed research or are addendato papers previously published in the Physical Review. ...
Physica Scripta, 1994
ABSTRACT Results on isotopic effects in the production of light fragments in reactions of 14A and... more ABSTRACT Results on isotopic effects in the production of light fragments in reactions of 14A and 32A MeV 14N ions with 112Sn and 124Sn are presented. The data are discussed in the frameworks of classical Weisskopf evaporation and an alternative Fermi gas prescription. The source isospin dependence of the production rates is consistent only with the latter prescription. It is emphasized that similar data from p-nucleus reactions and from projectile-like fragments in 40Ar induced reactions behave in the same way.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1996
We present range telescopes for measurements of low energy K+ mesons together with first in-beam ... more We present range telescopes for measurements of low energy K+ mesons together with first in-beam results. The hardware trigger, based on the observation of the μ+ from the K+ → μ+ + νμ decay channel, is designed for subthreshold hadron-nucleus and heavy ion reactions, where the kaon fraction of the total number of charged particles is ⪡ 10−4. The geometrical
Physical Review C, 2000
Pion excitation functions in proton-nucleus collisions, from the absolute threshold to 500 MeV, h... more Pion excitation functions in proton-nucleus collisions, from the absolute threshold to 500 MeV, have been measured with 1 MeV beam energy resolution at the CELSIUS storage ring, operating in slow ramping mode. Total yields, angular distributions, and target mass dependence of ϩ production are generally reproduced well by QMD calculations. The ϩ / Ϫ ratios are not reproduced equally well, obviously because the detailed description of the pion interaction with the Coulomb field is very delicate.
Physics Letters B, 1993
Neutron-proton correlation functions in 30.4 MeV 4°Ar+ 197Au, 12C, CH2 reactions have been measur... more Neutron-proton correlation functions in 30.4 MeV 4°Ar+ 197Au, 12C, CH2 reactions have been measured. In contrast to the nn and pp correlations, which exhibit the shape expected from quantum symmetrization effects and nuclear + Coulomb (pp) f'malstate interaction, the np function shows much less correlation strength. This may be due to Coulomb repulsion on the proton and/ or to a larger effective spin than expected. Selecting high energy nucleons strengthens both the np and pp correlations.
Physical Review C, 1993
Exclusive events for central collision of 94Kr on Ag/Br emulsion at a bombarding energy of 70-120... more Exclusive events for central collision of 94Kr on Ag/Br emulsion at a bombarding energy of 70-120 MeV per nucleon point to an extremely large flow energy of the order of 10 MeV per nucleon for intermediate mass fragments. We show that this large radial flow energy is associated with an explosive breakup of the excited matter in the very early
Physical Review C, 1994
Cl! _ ` {-4 (li clei to break-up into several pieces have not yet been completely elucidated. (Se... more Cl! _ ` {-4 (li clei to break-up into several pieces have not yet been completely elucidated. (See [8-10] OCR Output information concerning the multifragmentation process, the mechanisms that cause nu barding energies. (See [1-7] and references therein). Despite large efforts in collecting is the most important reaction mechanism in central collisions at intermediate bom The break-up of nuclear systems into several fragments of intermediate sizes (IMF) system at relatively early stages of the collision process. cate that these angular pattems give information on the shape of the multifragmenting lyzed through simulations based on a molecular dynamical approach. The results indi at intermediate bombarding energies, and observed in emulsion experiments, are ana Abstract: The angular patterns of fragments produced in central heavy-ion collisions
Nuclear Physics A, 1991
... ENERGY HW BARZ', JP BONDORF 2, R. DONANGEL03, R. ELM4, FS HANSEN 2, B ..... more ... ENERGY HW BARZ', JP BONDORF 2, R. DONANGEL03, R. ELM4, FS HANSEN 2, B ... SERSTR4 3 'Zentralinstitut f Kernforschung, Rossendorf, 0-8051 Dresden, Germany 2 The Niels Bohr Institute ... Rio de Janeiro, 21945 Rio de Janeiro, Brazil 4 University of Lund, Sblvegatan 14 ...
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1992
A CCD-based system for reading and analyzing nuclear emulsion pictures is described. Profile and ... more A CCD-based system for reading and analyzing nuclear emulsion pictures is described. Profile and area measurements on tracks produced by stopping nuclei with charge 1 lo 79 are presented. The charge resolution is ranging from AZ/Z < 0.6 at a residual range of 100 Frn to AZ/Z 5 0.3 at 200 pm for all charges.
We present range telescopes for measurements of low energy K+ mesons together with first in-beam ... more We present range telescopes for measurements of low energy K+ mesons together with first in-beam results. The hardware trigger, based on the observation of the μ+ from the K+ -> μ+ + νμ decay channel, is designed for subthreshold hadron-nucleus and heavy ion reactions, where the kaon fraction of the total number of charged particles is ≪ 10-4. The geometrical efficiency is ~15% and the total efficiency ~4% for K+ registration in the present version of the detector.
We present range telescopes for measurements of low energy K+ mesons together with first in-beam ... more We present range telescopes for measurements of low energy K+ mesons together with first in-beam results. The hardware trigger, based on the observation of the μ+ from the K+ -> μ+ + νμ decay channel, is designed for subthreshold hadron-nucleus and heavy ion reactions, where the kaon fraction of the total number of charged particles is ≪ 10-4. The geometrical efficiency is ~15% and the total efficiency ~4% for K+ registration in the present version of the detector.
Harvard Deusto Marketing Y Ventas, 2009
Un consumidor puede salir de un sitio web con la misma rapidez con la que ha entrado si no le lla... more Un consumidor puede salir de un sitio web con la misma rapidez con la que ha entrado si no le llama la atencion inmediatamente o no presenta productos o promociones relevantes que se correspondan con lo que esta buscando. Por ello, es necesario implementar prestaciones que ayuden a atraer, retener y maximizar al cliente on-line.
Physical Review Letters, 1997
ABSTRACT Slow ramping of the CELSIUS storage ring has been utilized to measure the yield of charg... more ABSTRACT Slow ramping of the CELSIUS storage ring has been utilized to measure the yield of charged pions in proton and heavy ion induced collisions with continuously varying beam energy. Boltzmann-Uehling-Uhlenbeck predictions, including Fermi momenta of nucleons in nuclei, follow the general shape of the p-nucleus excitation functions quite well except for a general overestimation of the backward emission. For heavy ion reactions the calculated yield also falls off faster with decreasing beam energy than the data. No statistically significant narrow resonances are observed.
Physical Review Letters, 1997
The differential cross section data representing A 58 and A 20 at 85 ± and 125 ± in Fig. 4 (mid a... more The differential cross section data representing A 58 and A 20 at 85 ± and 125 ± in Fig. 4 (mid and right parts of figure) should contain the information " 3 0.1". Note that corresponding data are correctly presented in Fig. 2.
Physical Review C, 1995
Page 1. PHYSICAL REVIEW C VOLUME 51,NUMBER 5 MAY 1995 BRIEF REPORTS Brief Reports are short paper... more Page 1. PHYSICAL REVIEW C VOLUME 51,NUMBER 5 MAY 1995 BRIEF REPORTS Brief Reports are short papers which report on completed research or are addendato papers previously published in the Physical Review. ...
Physica Scripta, 1994
ABSTRACT Results on isotopic effects in the production of light fragments in reactions of 14A and... more ABSTRACT Results on isotopic effects in the production of light fragments in reactions of 14A and 32A MeV 14N ions with 112Sn and 124Sn are presented. The data are discussed in the frameworks of classical Weisskopf evaporation and an alternative Fermi gas prescription. The source isospin dependence of the production rates is consistent only with the latter prescription. It is emphasized that similar data from p-nucleus reactions and from projectile-like fragments in 40Ar induced reactions behave in the same way.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1996
We present range telescopes for measurements of low energy K+ mesons together with first in-beam ... more We present range telescopes for measurements of low energy K+ mesons together with first in-beam results. The hardware trigger, based on the observation of the μ+ from the K+ → μ+ + νμ decay channel, is designed for subthreshold hadron-nucleus and heavy ion reactions, where the kaon fraction of the total number of charged particles is ⪡ 10−4. The geometrical
Physical Review C, 2000
Pion excitation functions in proton-nucleus collisions, from the absolute threshold to 500 MeV, h... more Pion excitation functions in proton-nucleus collisions, from the absolute threshold to 500 MeV, have been measured with 1 MeV beam energy resolution at the CELSIUS storage ring, operating in slow ramping mode. Total yields, angular distributions, and target mass dependence of ϩ production are generally reproduced well by QMD calculations. The ϩ / Ϫ ratios are not reproduced equally well, obviously because the detailed description of the pion interaction with the Coulomb field is very delicate.
Physics Letters B, 1993
Neutron-proton correlation functions in 30.4 MeV 4°Ar+ 197Au, 12C, CH2 reactions have been measur... more Neutron-proton correlation functions in 30.4 MeV 4°Ar+ 197Au, 12C, CH2 reactions have been measured. In contrast to the nn and pp correlations, which exhibit the shape expected from quantum symmetrization effects and nuclear + Coulomb (pp) f'malstate interaction, the np function shows much less correlation strength. This may be due to Coulomb repulsion on the proton and/ or to a larger effective spin than expected. Selecting high energy nucleons strengthens both the np and pp correlations.
Physical Review C, 1993
Exclusive events for central collision of 94Kr on Ag/Br emulsion at a bombarding energy of 70-120... more Exclusive events for central collision of 94Kr on Ag/Br emulsion at a bombarding energy of 70-120 MeV per nucleon point to an extremely large flow energy of the order of 10 MeV per nucleon for intermediate mass fragments. We show that this large radial flow energy is associated with an explosive breakup of the excited matter in the very early
Physical Review C, 1994
Cl! _ ` {-4 (li clei to break-up into several pieces have not yet been completely elucidated. (Se... more Cl! _ ` {-4 (li clei to break-up into several pieces have not yet been completely elucidated. (See [8-10] OCR Output information concerning the multifragmentation process, the mechanisms that cause nu barding energies. (See [1-7] and references therein). Despite large efforts in collecting is the most important reaction mechanism in central collisions at intermediate bom The break-up of nuclear systems into several fragments of intermediate sizes (IMF) system at relatively early stages of the collision process. cate that these angular pattems give information on the shape of the multifragmenting lyzed through simulations based on a molecular dynamical approach. The results indi at intermediate bombarding energies, and observed in emulsion experiments, are ana Abstract: The angular patterns of fragments produced in central heavy-ion collisions
Nuclear Physics A, 1991
... ENERGY HW BARZ&amp;amp;#x27;, JP BONDORF 2, R. DONANGEL03, R. ELM4, FS HANSEN 2, B ..... more ... ENERGY HW BARZ&amp;amp;#x27;, JP BONDORF 2, R. DONANGEL03, R. ELM4, FS HANSEN 2, B ... SERSTR4 3 &amp;amp;#x27;Zentralinstitut f Kernforschung, Rossendorf, 0-8051 Dresden, Germany 2 The Niels Bohr Institute ... Rio de Janeiro, 21945 Rio de Janeiro, Brazil 4 University of Lund, Sblvegatan 14 ...
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1992
A CCD-based system for reading and analyzing nuclear emulsion pictures is described. Profile and ... more A CCD-based system for reading and analyzing nuclear emulsion pictures is described. Profile and area measurements on tracks produced by stopping nuclei with charge 1 lo 79 are presented. The charge resolution is ranging from AZ/Z < 0.6 at a residual range of 100 Frn to AZ/Z 5 0.3 at 200 pm for all charges.
We present range telescopes for measurements of low energy K+ mesons together with first in-beam ... more We present range telescopes for measurements of low energy K+ mesons together with first in-beam results. The hardware trigger, based on the observation of the μ+ from the K+ -> μ+ + νμ decay channel, is designed for subthreshold hadron-nucleus and heavy ion reactions, where the kaon fraction of the total number of charged particles is ≪ 10-4. The geometrical efficiency is ~15% and the total efficiency ~4% for K+ registration in the present version of the detector.
We present range telescopes for measurements of low energy K+ mesons together with first in-beam ... more We present range telescopes for measurements of low energy K+ mesons together with first in-beam results. The hardware trigger, based on the observation of the μ+ from the K+ -> μ+ + νμ decay channel, is designed for subthreshold hadron-nucleus and heavy ion reactions, where the kaon fraction of the total number of charged particles is ≪ 10-4. The geometrical efficiency is ~15% and the total efficiency ~4% for K+ registration in the present version of the detector.