UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2022-08-12 15:52

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Conference: Bucharest University Faculty of Physics 2016 Meeting


Section: Nuclear and Elementary Particles Physics


Title:
Astrophysical production of 146Sm Isotope


Authors:
Cristina OPREA, A. OPREA


Affiliation:
Frank Laboratory of Neutron Physics,Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, RF



E-mail
coprea2005@yahoo.co.uk


Keywords:
p-process, 146Sm, chronometer, 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 (a,g) and (a,n) which are leading to the formation of 146Sm and 144Sm isotopes. The (a,g) and (a,n) cross sections from the threshold up to 15-20 MeVís 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 a-potentials and nuclear level densities. They could be used in the analysis of inverse reactions and for new measurements (a,g) and (a,n) reactions at different facilities.