dorsal/arxiv
View SchemaA deformed QRPA formalism for single and two-neutrino double beta decay
| Authors | R. Alvarez-Rodriguez, P. Sarriguren, E. Moya de Guerra, L. Pacearescu, A. Faessler, F. Simkovic |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0411039 |
| URL | https://arxiv.org/abs/nucl-th/0411039 |
| DOI | 10.1103/PhysRevC.70.064309 |
| Journal | Phys.Rev. C70 (2004) 064309 |
Abstract
We use a deformed QRPA formalism to describe simultaneously the energy distributions of the single beta Gamow-Teller strength and the two-neutrino double beta decay matrix elements. Calculations are performed in a series of double beta decay partners with A = 48, 76, 82, 96, 100, 116, 128, 130, 136 and 150, using deformed Woods-Saxon potentials and deformed Skyrme Hartree-Fock mean fields. The formalism includes a quasiparticle deformed basis and residual spin-isospin forces in the particle-hole and particle-particle channels. We discuss the sensitivity of the parent and daughter Gamow-Teller strength distributions in single beta decay, as well as the sensitivity of the double beta decay matrix elements to the deformed mean field and to the residual interactions. Nuclear deformation is found to be a mechanism of suppression of the two-neutrino double beta decay. The double beta decay matrix elements are found to have maximum values for about equal deformations of parent and daughter nuclei. They decrease rapidly when differences in deformations increase. We remark the importance of a proper simultaneous description of both double beta decay and single Gamow-Teller strength distributions. Finally, we conclude that for further progress in the field it would be useful to improve and complete the experimental information on the studied Gamow-Teller strengths and nuclear deformations.
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"abstract": "We use a deformed QRPA formalism to describe simultaneously the energy\ndistributions of the single beta Gamow-Teller strength and the two-neutrino\ndouble beta decay matrix elements. Calculations are performed in a series of\ndouble beta decay partners with A = 48, 76, 82, 96, 100, 116, 128, 130, 136 and\n150, using deformed Woods-Saxon potentials and deformed Skyrme Hartree-Fock\nmean fields. The formalism includes a quasiparticle deformed basis and residual\nspin-isospin forces in the particle-hole and particle-particle channels. We\ndiscuss the sensitivity of the parent and daughter Gamow-Teller strength\ndistributions in single beta decay, as well as the sensitivity of the double\nbeta decay matrix elements to the deformed mean field and to the residual\ninteractions. Nuclear deformation is found to be a mechanism of suppression of\nthe two-neutrino double beta decay. The double beta decay matrix elements are\nfound to have maximum values for about equal deformations of parent and\ndaughter nuclei. They decrease rapidly when differences in deformations\nincrease. We remark the importance of a proper simultaneous description of both\ndouble beta decay and single Gamow-Teller strength distributions. Finally, we\nconclude that for further progress in the field it would be useful to improve\nand complete the experimental information on the studied Gamow-Teller strengths\nand nuclear deformations.",
"arxiv_id": "nucl-th/0411039",
"authors": [
"R. Alvarez-Rodriguez",
"P. Sarriguren",
"E. Moya de Guerra",
"L. Pacearescu",
"A. Faessler",
"F. Simkovic"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.70.064309",
"journal_ref": "Phys.Rev. C70 (2004) 064309",
"title": "A deformed QRPA formalism for single and two-neutrino double beta decay",
"url": "https://arxiv.org/abs/nucl-th/0411039"
},
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