dorsal/arxiv
View SchemaThe strength of nuclear shell effects at N=126 in the r-process region
| Authors | A. R. Farhan, M. M. Sharma |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0601018 |
| URL | https://arxiv.org/abs/nucl-th/0601018 |
| DOI | 10.1103/PhysRevC.73.045803 |
| Journal | Phys.Rev. C73 (2006) 045803 |
Abstract
We have investigated nuclear shell effects across the magic number N=126 in the region of the r-process path. Microscopic calculations have been performed using the relativistic Hartree-Bogoliubov approach within the framework of the RMF theory for isotopic chains of rare-earth nuclei in the r-process region. The Lagrangian model NL-SV1 with the inclusion of the vector self-coupling of omega meson has been employed. The RMF results show that the shell effects at N=126 remain strong and exhibit only a slight reduction in the strength in going from the r-process path to the neutron drip line. This is in striking contrast to a systematic weakening of the shell effects at N=82 in the r-process region predicted earlier in the similar approach. In comparison the shell effects with microscopic-macroscopic mass formulae show a near constancy of shell gaps leading to strong shell effects in the region of r-process path to the drip line. A recent analysis of solar-system r-process abundances in a prompt supernova explosion model using various mass formulae including the recently introduced mass tables based upon HFB approach shows that whilst mass formulae with weak shell effects at N=126 give rise to a spread and an overproduction of nuclides near the third abundance peak at A~190, mass tables with droplet models showing stronger shell effects are able to reproduce the abundance features near the third peak appropriately. In comparison, several analyses of the second r-process peak at A~130 have required weakened shell effects at N=82. Our predictions in the RMF theory with NL-SV1, which exhibit weaker shell effects at N=82 and stronger one at N=126 in the r-process region, support the conjecture that a different nature of the shell effects at the magic numbers may be at play in r-process nucleosynthesis of heavy nuclei.
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"abstract": "We have investigated nuclear shell effects across the magic number N=126 in\nthe region of the r-process path. Microscopic calculations have been performed\nusing the relativistic Hartree-Bogoliubov approach within the framework of the\nRMF theory for isotopic chains of rare-earth nuclei in the r-process region.\nThe Lagrangian model NL-SV1 with the inclusion of the vector self-coupling of\nomega meson has been employed. The RMF results show that the shell effects at\nN=126 remain strong and exhibit only a slight reduction in the strength in\ngoing from the r-process path to the neutron drip line. This is in striking\ncontrast to a systematic weakening of the shell effects at N=82 in the\nr-process region predicted earlier in the similar approach. In comparison the\nshell effects with microscopic-macroscopic mass formulae show a near constancy\nof shell gaps leading to strong shell effects in the region of r-process path\nto the drip line. A recent analysis of solar-system r-process abundances in a\nprompt supernova explosion model using various mass formulae including the\nrecently introduced mass tables based upon HFB approach shows that whilst mass\nformulae with weak shell effects at N=126 give rise to a spread and an\noverproduction of nuclides near the third abundance peak at A~190, mass tables\nwith droplet models showing stronger shell effects are able to reproduce the\nabundance features near the third peak appropriately. In comparison, several\nanalyses of the second r-process peak at A~130 have required weakened shell\neffects at N=82. Our predictions in the RMF theory with NL-SV1, which exhibit\nweaker shell effects at N=82 and stronger one at N=126 in the r-process region,\nsupport the conjecture that a different nature of the shell effects at the\nmagic numbers may be at play in r-process nucleosynthesis of heavy nuclei.",
"arxiv_id": "nucl-th/0601018",
"authors": [
"A. R. Farhan",
"M. M. Sharma"
],
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"nucl-th",
"astro-ph"
],
"doi": "10.1103/PhysRevC.73.045803",
"journal_ref": "Phys.Rev. C73 (2006) 045803",
"title": "The strength of nuclear shell effects at N=126 in the r-process region",
"url": "https://arxiv.org/abs/nucl-th/0601018"
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