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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 21:10 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Nuclear and Elementary Particles Physics I
Title:
Astrophysical cross sections of 144Sm and 146Sm Isotopes
Authors:
Cristiana OPREA, Ioan Alexandru OPREA
Affiliation:
Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics,
141980 Dubna, Moscow Region, RF
E-mail
coprea2007@yahoo.co.uk
Keywords:
p-process, 146Sm, 144Sm, cross section, production ratio 146Sm/144Sm
Abstract:
A possible p-process chronometer could be the 146Sm nucleus and this issue is direct related to the uncertainties of production ratio 146Sm/144Sm observed in many meteorites and planetary bodies. One of the component of production ratios are the cross sections of type (alpha, gamma) and (alpha,n) which are leading to the formation of 146Sm and 144Sm isotopes. The (alpha, gamma) and (alpha,n) cross sections from the threshold up to 15-20 MeV’s were obtained. We have analyzed also the contribution to the cross sections of direct and pre-equilibrium processes not only of compound processes as there are done in other papers from literature. The contribution of direct and pre-equilibrium processes becomes important with the increasing of energy.
The cross section values obtained in the present evaluations are compared with experimental data if they exist and give new data on alpha - potentials and nuclear level densities. They could be used in the analysis of inverse reactions and for new measurements (alpha, gamma) and (alpha,n) reactions at different facilities.
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