35,37,39S isotopes in sd–pf space: Shell-model interpretation

Saxena, A.; Srivastava, P. C.; Hirsch, Jorge G.; Kota, V. K. B.; Ermamatov, M. J.

doi:10.1016/j.nuclphysa.2017.02.008

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…The shape transitions in the neutron-rich exotic Si and S isotopes are explained on the basis of the tensor-force nature of the Hamiltonian by developing SDPF-MU interaction [47]. The shell model calculations for neutron-rich S isotopes could explain the available experimental level scheme, electric quadrupole and the magnetic dipole moments, and spectroscopic factors using sd-pf model space [48]. A detailed theoretical shell model investigation in sd and sd-pf model spaces for 28 Mg highlighted the significance of pf-shell contributions for explaining three higher energy levels beyond 7MeV [49].…”

Section: Introductionmentioning

confidence: 99%

Indispensability of cross-shell contributions in neutron resonance spacing

Ghosh,

Sangeeta,

Maheshwari

et al. 2024

J. Phys. G: Nucl. Part. Phys.

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Spin and parity dependent nuclear level densities (NLDs) are obtained for configuration interaction shell model using a numerically efficient spectral distribution method. The calculations are performed for 24Na, 25,26,27Mg nuclei using full sd-pf model space that incorporates the cross-shell excitations from sd to pf-shell. The NLDs so obtained are then employed to determine the s-wave neutron resonance spacing (D0) which is one of the crucial inputs for the predictions of astrophysical reaction rates. Though the considered nuclei are not neutron-rich, the contributions from cross-shell excitations to pf-shell are indispensable to explain the experimental data for D0 which otherwise are significantly overestimated.

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Section: Introductionmentioning

confidence: 99%

Indispensability of cross-shell contributions in neutron resonance spacing

Ghosh,

Sangeeta,

Maheshwari

et al. 2024

J. Phys. G: Nucl. Part. Phys.

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Extended Applications of SU(3)

Kota

2020

SU(3) Symmetry in Atomic Nuclei

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Shell-model based study of the direct capture in neutron-rich nuclei

Sieja

Goriely

2021

Eur. Phys. J. A

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The radiative neutron capture rates for isotopes of astrophysical interest are commonly calculated within the statistical Hauser-Feshbach reaction model. Such an approach, assuming a high level density in the compound system, can be questioned in light and neutron-rich nuclei for which only a few or no resonant states are available. Therefore, in this work we focus on the direct neutron-capture process. We employ a shell-model approach in several model spaces with well-established effective interactions to calculate spectra and spectroscopic factors in a set of 50 neutronrich target nuclei in different mass regions, including doubly-, semi-magic and deformed ones. Those theoretical energies and spectroscopic factors are used to evaluate direct neutron capture rates and to test global theoretical models using average spectroscopic factors and level densities based on the Hartree-Fock-Bogoliubov plus combinatorial method. The comparison of shell-model and global model results reveals several discrepancies that can be related to problems in level densities. All the results show however that the direct capture is non-negligible with respect to the by-default Hauser-Feshbach predictions and can be even 100 times more important for the most neutron-rich nuclei close to the neutron drip line.

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35,37,39S isotopes in sd–pf space: Shell-model interpretation

Cited by 4 publications

References 31 publications

Indispensability of cross-shell contributions in neutron resonance spacing

Indispensability of cross-shell contributions in neutron resonance spacing

Extended Applications of SU(3)

Shell-model based study of the direct capture in neutron-rich nuclei

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