Low energy alpha-nucleus optical potential studied via (a,n) cross section measurements on Te isotopes
arxiv(2024)
Abstract
In several processes of stellar nucleosynthesis, like the astrophysical
gamma-process, nuclear reactions involving alpha particles play an important
role. The description of these reactions necessitates the knowledge of the
alpha-nucleus optical model potential (AOMP) which is highly ambiguous at low,
astrophysical energies. This ambiguity introduces a substantial uncertainty in
the stellar models for predicting elemental and isotopic abundances. The
experimental study of the AOMP is thus necessary which can be implemented by
measuring the cross section of alpha-induced nuclear reactions. At low
energies, (a,n) reactions are suitable for such a purpose. Therefore, in the
present work, the (a,n) cross sections of four Te isotopes have been measured,
mostly for the first time, and compared with theoretical predictions. The (a,n)
cross sections of 120,122,124,130Te have been measured in the energy range
between about 10 and 17 MeV using the activation method. The detection of the
gamma radiation following the decay of the radioactive reaction products were
used to determine the cross sections. The measured cross sections are compared
with statistical model calculations obtained from the widely used TALYS nuclear
reaction simulation code. Predictions using various available AOMPs are
investigated. It is found that the recently developed Atomki-V2 AOMP provides
the best description for all studied reactions and this potential also
reproduces well the total reaction cross sections from elastic scattering
experiments, when they are available in literature. We recommend therefore to
use the astrophysical reaction rates based on this potential for
nucleosynthesis models of heavy elements.
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