The α-12C scattering studied via the Trojan-Horse method (original) (raw)
Related papers
EPJ Web of Conferences, 2015
The triton angular distribution in the 12 C(7 Li,t) 16 O reaction has been measured at 20 MeV incident energy. Comparison of the data with Finite Range DWBA and CDCC-CRC calculations show that breakup coupling effects are prominent in the transfer to the ground state. This observation is similar to that in the 12 C(6 Li,d) reaction at the same incident energy. The alpha spectroscopic factor of the 16 O ground state is determined (Sα=0.25) from a comparison of the measured angular distribution with respect to the CDCC-CRC calculations. The E2 S-factor of the 12 C(α,γ) reaction at 300 keV in the framework of a potential model is determined to be about 118 keV-barn.
Progress of Theoretical Physics Supplement, 2004
The Trojan Horse Method was applied to the 2 H(6 Li,α 3 He)n three-body reaction in order to extract the bare nucleus S(E) factor for the 6 Li(p,α) 3 He reaction. The three-body reaction was performed in two kinematically complete experiments at beam energies of 25 and 14 MeV. The selected quasi-free coincidence yield was compared with the result of a Monte Carlo calculation where the entering two-body cross section was the result of a Rmatrix parameterization of the direct two-body cross section. The quite good agreement throughout the investigated region above and below the p-6 Li Coulomb barrier, allowed for the extraction of the bare S(E) factor in the astrophysical energy region. The S(0) value together with an independent estimate of the screening potential Ue were derived and compared with those obtained from direct measurements.
The 12C + α reaction rate from the elastic 16O breakup
Nuclear Physics A, 1997
Evidence for direct elastic breakup of 160 into the c~-12C continuum with relative energies ranging from 900 to 1800 keV has been obtained in the scattering of 1527 MeV 160 projectiles off 2°8pb. An interpretation of E2 breakup including nuclear and Coulomb contributions leads to reduced electromagnetic transitions probabilities and astrophysical SE2 factors in reasonable agreement with direct measurements, showing that the method can be applied to extract the E2 part of the 12C(a, 3,) reaction rate. 0375-9474/97/$17.00 © 1997 -Elsevier Science B.V. All rights reserved. PIl: S0375-9474(97)00233-9
^{7,9,10}Be elastic scattering and total reaction cross sections on a ^{12}C target
Physical Review C, 2011
Elastic scattering angular distributions for 7 Be, 9 Be, and 10 Be isotopes on 12 C target were measured at laboratory energies of 18.8, 26.0, and 23.2 MeV, respectively. The analysis was performed in terms of optical model potentials using Woods-Saxon and double-folding form factors. Also, continuum discretized coupled-channels calculations were performed for 7 Be and 9 Be + 12 C systems to infer the role of breakup in the elastic scattering. For the 10 Be + 12 C system, bound states coupled-channels calculations were considered. Moreover, total reaction cross sections were deduced from the elastic scattering analysis and compared with published data on other weakly and tightly bound projectiles elastically scattered on the 12 C target, as a function of energy.
Few-body reactions investigated with the Trojan Horse Method
SciPost Physics Proceedings
The Trojan Horse Method is an indirect method to measure reaction cross sections at energies of interest for nuclear astrophysics, exploiting the nuclei clustering properties. Here it is presented with its general features and detailed for the case of the ^22H(d,p)^33H and ^22H(d,n)^33He measurements, where interesting results for astrophysics and energy fusion power plants have been obtained.
ScienceDirect α-particle elastic scattering from 12 C, 16 O, 24 Mg, and 28 Si
The elastic scattering of α-particle is analyzed in terms of the optical model over the energy 104-172.2 MeV for 12 C, 48.7-146 MeV for 16 O, 50-119 MeV for 24 Mg, and 104, 166, 120 and 240 MeV for 28 Si. We generate the real part of the optical model potential using the single folding model. In the single folding procedure, the ground state density of the target is folded with an effective density dependent α-nucleon interaction. For the imaginary part, the usual Woods-Saxon form is used. The parameters of the effective density dependent α-nucleon interaction are determined by fitting the experimental data of elastic scattering. The effective interaction's parameters are optimized using the χ 2 criterion. We reasonably reproduce the elastic scattering cross sections for all studied systems. The obtained results reflect the success of our obtained α-nucleon effective interaction. K.O. Behairy et al. / Nuclear Physics A 957 (2017) 332-346 333 tential. It is appropriate and helpful if one of the interacting pairs is a light nucleus or of simple structure like the α-particle [1]. α-particle is considered a satisfactory probe because it is a symmetric nucleus with spin and isospin zero. This spin and isospin saturation makes the α-nucleon effective interaction is simple to use for calculating the α-nucleus potential. This α-nucleon effective interaction is extensively and systematically studied at a wide range of energies and for many nuclei .
Quasifree Scattering in the ⁶Li(α, 2α)²H Reaction at E[α]=118 MeV
Three body breakup cross sections for the 6Li(a, 2a)2H reaction were measured at E,,,,=118 MeV in coplanar symmetric geometry. In spectra projected on the energy axis (E1) for one scattered a-particle, quasifree scattering enhancements were seen at the points of minimum recoil deuteron energy (Ed). The recoil deuteron momenta at these minima varied from-120 MeV/c to +226 MeV/c. DWIA calculations were used to analyze the experimental data. Except at 0a=35° and 50°, good fits to the data were obtained. The width of the QFS peak was 71 MeV/c (FWHM) and the spectroscopic factor C,,d was 0.82. These results were consistent with those obtained from the 6Li(p, pd)4He reaction. KEYWORDS: Nuclear reactions 6Li(a, 2a)2H, E= 118 MeV/ Measured three body breakup cross sections/ Compared with distorted wave impulse approximation calculations/ Enriched 6Li target.
12C+12C reactions at astrophysical energies: Tests of targets behaviour under beam bombardment
AIP Conference Proceedings, 2014
12 C(12 C, α) 20 Ne and 12 C(12 C, p) 23 Na are the most important reactions during the carbon burning phase in stars. Direct measurements at the relevant astrophysical energy (E=1.5±0.3MeV) are very challenging because of the extremely small cross sections involved and of the high beam-induced background originating from impurities in the targets. In addition, persistent resonant structures at low energies are not well understood and make the extrapolation of the cross section from high energy data very uncertain. As a preliminary step towards the measurements of the 12 C(12 C, α) 20 Ne and 12 C(12 C, p) 23 Na reactions we intend to investigate the behaviour of targets under beam bombardment, specifically the quantitative measurement of hydrogen and deuterium content of highly pure stable carbon targets in relation to target temperature. Experiments are taking place at the CIRCE accelerator in Caserta, Italy and preliminary results are presented here.