Low-energy proton capture reactions in the mass 55-60 region are studied in a microscopic optical model. The nuclear density profile is calculated using the relativistic mean field theory. The DDM3Y interaction is folded with the theoretical density to obtain the proton-nucleus optical potential. A definite set of normalization parameters has been obtained for the concerned mass region by comparing with all available experimental data in this mass region. These parameters have been used to obtain proton capture rates for astrophysically important reactions in this mass region.

GAUTAM GANGOPADHYAY

Physics

ABHIJIT BHATTACHARYYA

SAUMI DUTTA

DIPTI CHAKRABORTY

Fulltext

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Physical Review C

Radiative thermal neutron capture cross sections over the range of thermal energies from 1 keV to 1 MeV are studied in the statistical Hauser-Feshbach formalism. The optical model potential is constructed by folding the density-dependent M3Y nucleon-nucleon interaction with radial matter densities of target nuclei obtained from relativistic-mean-field (RMF) theory. The standard nuclear reaction code talys1.8 is used for calculation of cross sections. The nuclei studied in the present work reside near the Z=28 proton shell closure and are of astrophysical interest, taking part in p,s, and r processes of nucleosynthesis. The Maxwellian-averaged cross-section (MACS) values for energies important for astrophysical applications are presented. © 2016 American Physical Society.

Microscopic folding model analysis of the radiative (n,Î³) reactions near the Z=28 shell closure and the weak s process

Radiative thermal neutron capture cross sections over the range of thermal energies from 1 keV to 1 MeV are studied in the statistical Hauser-Feshbach formalism. The optical model potential is constructed by folding the density-dependent M3Y nucleon-nucleon interaction with radial matter densities of target nuclei obtained from relativistic-mean-field (RMF) theory. The standard nuclear reaction code TALYS1.8 is used for calculation of cross sections. The nuclei studied in the present work reside near the Z = 28 proton shell closure and are of astrophysical interest, taking part in p, s, and r processes of nucleosynthesis. The Maxwellian-averaged cross-section (MACS) values for energies important for astrophysical applications are presented.

Microscopic folding model analysis of the radiative (n, gamma) reactions near the Z=28 shell closure and the weak s process

Neutron capture cross sections have been calculated in nuclei near the N=82 neutron shell-closure. These nuclei are of astrophysical interest, participating in the s-process and the p-process. A semimicroscopic optical model has been used with the potential being obtained through folding the target density with the DDM3Y nucleon-nucleon interaction. Theoretical density values have been calculated using the relativistic mean-field approach. The calculated cross sections, as a function of neutron energy, agree reasonably well with experimental measurements. Maxwellian-averaged cross sections, important for astrophysical processes, have been calculated. © 2016 American Physical Society.

Neutron capture reactions near the N=82 shell-closure

The radiative neutron capture cross sections for nuclei participating in the s-process and the p-process nucleosynthesis in and around the N=50 closed neutron shell have been calculated in a statistical semimicroscopic Hauser-Feshbach approach for the energy range of astrophysical interest. A folded optical-model potential is constructed utilizing the standard DDM3Y real nucleon-nucleon interaction. The folding of the interaction with target radial matter densities, obtained from the relativistic mean-field theory, is done in coordinate space using the spherical approximation. The standard nuclear reaction code talys1.8 is used for cross-section calculation. The cross sections are compared with experimental results. Maxwellian-averaged cross sections and astrophysical reaction rates for a number of selected nuclei are also presented. © 2016 American Physical Society.

Neutron capture reactions relevant to the s and p processes in the region of the N=50 shell closure

Proton capture cross sections in the energy range of astrophysical interest for mass region 40-54 have been calculated in the Hauser-Feshbach formalism with the reaction code talys1.6. The density-dependent M3Y effective nucleon-nucleon interaction folded with target radial matter densities from the relativistic mean field approach is used to obtain the semimicroscopic optical potential. A definite normalization of potential well depths has been used over the entire mass region. The (p,γ) rates of some reactions, important in the astrophysical scenario, are calculated using the potential in the relevant mass region. © 2016 American Physical Society.

Journal	Physical Review C
Publisher	AMER PHYSICAL SOC
ISSN	2469-9985
Open Access	No