dorsal/arxiv
View SchemaSingle and double coincidence nucleon spectra in the weak decay of Lambda hypernuclei
| Authors | E. Bauer, G. Garbarino, A. Parreno, A. Ramos |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0602066 |
| URL | https://arxiv.org/abs/nucl-th/0602066 |
| DOI | 10.1016/j.nuclphysa.2010.01.246 |
| Journal | Nucl.Phys.A836:199-224,2010 |
Abstract
Recent progress has been experienced in the field of hypernuclear weak decay, especially concerning the ratio of the neutron- to proton-induced Lambda non-mesonic decay rates, G_n/G_p. Theoretical analyses of nucleon coincidence data have been performed in a finite nucleus framework. They led to the extraction of G_n/G_p values in agreement with pure theoretical estimates, thus providing an evidence for the solution of a longstanding puzzle. Here we present an alternative approach to the problem, based on a nuclear matter formalism extended to finite nuclei via the local density approximation. The work is motivated by the exigence to make the determination of G_n/G_p from data less model dependent. One-meson-exchange potentials are used for describing both the one- and two-nucleon induced decays, Lambda N -> n N and Lambda N N -> n N N. For the latter, treated within a microscopic approach, the channels Lambda n n -> n n n and Lambda p p -> n p p are included in addition to the mode Lambda n p -> n n p already considered, in a phenomenological way, in previous studies. The propagation of the final nucleons in the residual nucleus is simulated by an intranuclear cascade code. We evaluate single and double coincidence nucleon spectra for the non-mesonic decay of C-12-Lambda. Through the comparison of our predictions with KEK coincidence data we determine G_n/G_p=0.43 \pm 0.10 for this hypernucleus, confirming previous finite nucleus analyses.
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"abstract": "Recent progress has been experienced in the field of hypernuclear weak decay,\nespecially concerning the ratio of the neutron- to proton-induced Lambda\nnon-mesonic decay rates, G_n/G_p. Theoretical analyses of nucleon coincidence\ndata have been performed in a finite nucleus framework. They led to the\nextraction of G_n/G_p values in agreement with pure theoretical estimates, thus\nproviding an evidence for the solution of a longstanding puzzle. Here we\npresent an alternative approach to the problem, based on a nuclear matter\nformalism extended to finite nuclei via the local density approximation. The\nwork is motivated by the exigence to make the determination of G_n/G_p from\ndata less model dependent. One-meson-exchange potentials are used for\ndescribing both the one- and two-nucleon induced decays, Lambda N -\u003e n N and\nLambda N N -\u003e n N N. For the latter, treated within a microscopic approach, the\nchannels Lambda n n -\u003e n n n and Lambda p p -\u003e n p p are included in addition\nto the mode Lambda n p -\u003e n n p already considered, in a phenomenological way,\nin previous studies. The propagation of the final nucleons in the residual\nnucleus is simulated by an intranuclear cascade code. We evaluate single and\ndouble coincidence nucleon spectra for the non-mesonic decay of C-12-Lambda.\nThrough the comparison of our predictions with KEK coincidence data we\ndetermine G_n/G_p=0.43 \\pm 0.10 for this hypernucleus, confirming previous\nfinite nucleus analyses.",
"arxiv_id": "nucl-th/0602066",
"authors": [
"E. Bauer",
"G. Garbarino",
"A. Parreno",
"A. Ramos"
],
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"nucl-th"
],
"doi": "10.1016/j.nuclphysa.2010.01.246",
"journal_ref": "Nucl.Phys.A836:199-224,2010",
"title": "Single and double coincidence nucleon spectra in the weak decay of Lambda hypernuclei",
"url": "https://arxiv.org/abs/nucl-th/0602066"
},
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