Relativistic Treatment of Hypernuclear Decay
| dc.creator | Zhou, L. | |
| dc.creator | Piekarewicz, J. | |
| dc.date | 1999-02-15 | |
| dc.date.accessioned | 2026-07-07T11:11:52Z | |
| dc.date.available | 2026-07-07T11:11:52Z | |
| dc.description | We compute for the first time the decay width of lambda-hypernuclei in a relativistic mean-field approximation to the Walecka model. Due to the small mass difference between the lambda-hyperon and its decay products---a nucleon and a pion---the mesonic component of the decay is strongly Pauli blocked in the nuclear medium. Thus, the in-medium decay becomes dominated by the non-mesonic, or two-body, component of the decay. For this mode, the lambda-hyperon decays into a nucleon and a spacelike nuclear excitation. In this work we concentrate exclusively on the pion-like modes. By relying on the analytic structure of the nucleon and pion propagators, we express the non-mesonic component of the decay in terms of the spin-longitudinal response function. This response has been constrained from precise quasielastic (p,n) measurements done at LAMPF. We compute the spin-longitudinal response in a relativistic random-phase-approximation model that reproduces accurately the quasielastic data. By doing so, we obtain hypernuclear decay widths that are considerably smaller---by factors of two or three---relative to existing nonrelativistic calculations. | |
| dc.description | Revtex: 18 pages and 4 postscript figures | |
| dc.identifier | https://arxiv.org/abs/nucl-th/9902034 | |
| dc.identifier | http://arxiv.org/abs/nucl-th/9902034 | |
| dc.identifier | Phys.Rev.C60:024306,1999 | |
| dc.identifier | doi:10.1103/PhysRevC.60.024306 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/191242 | |
| dc.subject | Nuclear Theory | |
| dc.title | Relativistic Treatment of Hypernuclear Decay | |
| dc.type | text |