Radiative neutron capture reaction rates for r-process nucleosynthesis

Vinay Singh, Joydev Lahiri, Malay Kanti Dey, D. N. Basu

Submitted on 30 June 2022


About half of the elements beyond iron are synthesized in stars by rapid-neutron capture process (r-process). The stellar environment provides very high neutron flux in a short time ( seconds) which is conducive for the creation of progressively neutron-rich nuclei till the waiting point is reached after which no further neutron capture reactions proceed. At this point such extremely neutron-rich nuclei become stable via β decay. A detailed understanding of the r-process remains illusive. In the present work, we explore the radiative neutron-capture (n,γ) cross sections and reaction rates around the r-process peak near mass number eighty. The inherent uncertainties remain large in some cases, particularly in case of neutron-rich nuclei. When the low-energy enhancement exists, it results in significant increase in the reaction rate for neutron-capture.


Comment: 12 pages including 21 figures. arXiv admin note: text overlap with arXiv:1907.08054

Subjects: Nuclear Theory; Astrophysics - Solar and Stellar Astrophysics; Nuclear Experiment