Microscopic calculation of proton capture reactions in the mass 60–80 region and its astrophysical implications

Abstract

Microscopic optical potentials obtained by folding the DDM3Y interaction with the densities from Relativistic Mean Field approach have been utilized to evaluate S-factors of low-energy (p, γ) reactions in mass 60-80 region and to compare with experiments. The Lagrangian density FSU Gold has been employed. Astrophysical rates for important proton capture reactions have been calculated to study the behaviour of rapid proton nucleosynthesis for waiting point nuclei with mass less than A = 80.

Neutron capture reactions near theN=82shell-closure

“…This method has been followed in a number of our recent works [4][5][6][7][8][9]. For example, in Chakraborty et al [9], this procedure has been utilized to study proton capture reactions, important for the astrophysical p-process in mass 110−125 region.…”

Importance of Q-Values in Astrophysical Rapid Proton Capture Process

“…4 of Ref. [4], this is due to the fact that at 1.5 GK, the two proton capture process has a very large cross-section for this nucleus. In A = 88 and 92, we observe a somewhat similar behaviour, though the falling off at higher S p values is very slow.…”

Effects of NN potentials on p Nuclides in the A ∼100–120 region

“…In case of DDM3Y interaction, which is not obtained from the RMF theory, we folded it with RMF density from FSUGold. This FSUGold folded DDM3Y interaction have been used in earlier works [4][5][6][7][8] and successfully reproduced some astrophysically important cross sections and reaction rates in A ∼ 55-100 region. Therefore, we used this potential in A ∼ 100-120 region as an extension of earlier works.…”

“…In some earlier works [4][5][6][7][8], FSUGold was proved to be successful in reproducing experimentally obtained binding energy, charge radius and charge density data in the A∼55-100 region. Again in 1997, NL3 parameter set had been introduced by Lalazissis et al [21] with a aim to provide a better description not only for the properties of stable nuclei but also for those far from the β stability line and during last two decades, this parameter set successfully reproduces binding energy, charge radius etc of various elements throughout the periodic table [21,27].…”

“…This has the advantage of extending it to unknown mass regions. In some earlier works [4][5][6][7][8], this method has been used to study low energy proton reactions in the A ∼ 55-100 region. In a recent work [9], similar method has been used in 110-125 mass region.…”