Astrophysical reaction rates with realistic nuclear level densities

Scientific paper - Original scientific paper

• Author: A Sangeeta
• Author: T. Ghosh
• Author: B. Maheshwari
• Author: G. Saxena
• Author: B. K. Agrawal
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Realistic nuclear level densities (NLDs) obtained within the spectral distribution method (SDM) are employed to study nuclear processes of astrophysical interest. The merit of SDM lies in the fact that the NLDs corresponding to many-body shell-model Hamiltonians consisting of residual interaction can be obtained for the full configurational space without recourse to the exact diagnolization of huge matrices. We calculate NLDs and s -wave neutron resonance spacings which agree reasonably well with the available experimental data. By employing these NLDs, we compute reaction cross sections and astrophysical reaction rates for radiative neutron capture in few Fe-group nuclei and compare them with experimental data as well as with those obtained with NLDs from phenomenological and microscopic mean-field models. The results obtained for the NLDs from SDM are able to explain the experimental data quite well. These results are of particular importance since the configuration mixing through the residual interaction naturally accounts for the collective excitations. In the mean-field models, the collective effects are included through the vibrational and rotational enhancement factors, and their NLDs are further normalized at low energies with neutron resonance data.

• Keywords (english): Level densities; shell model; astrophysical reaction rates
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C
• Numbering: vol. 105, no. 4, 044320
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.105.044320
• URN:NBN: urn:nbn:hr:217:244322
• Publication: 2022
• Project: Number: TTP-2018-07-3554; Title (croatian): Exotic Nuclear Structure and Dynamics; Title (english): Exotic Nuclear Structure and Dynamics; Acronym: ExoNSD; Leader: Kosuke Nomura; Jurisdiction: Croatia; Funding stream: TTP
• Document URL: https://link.aps.org/doi/10.1103/PhysRevC.105.044320
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2022 American Physical Society. Received 11 June 2021; Revised 7 March 2022; Accepted 25 March 2022; Published 20 April 2022.
• Created on: 2023-09-13 19:30:55