Role of the isovector nucleon-nucleus interaction potential in nonmesonic hypernuclear decay

Journal Article · Wed Dec 15 04:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.067305· OSTI ID:21499304

Barbero, C; Mariano, A ^[1]; Duarte, S B ^[2]

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1. Facultad de Ciencias Exactas, Departamento de Fisica, Universidad Nacional de La Plata, 1900 La Plata (Argentina)
2. Centro Brasileiro de Pesquisas Fisicas, Rua Dr Xavier Sigaud 150 CEP 22290-180, Rio de Janeiro-RJ (Brazil)

We develop a theoretical finite nucleus framework for the evaluation of the coincidence number of pairs N{sub nN} and the asymmetry parameter a{sub {Lambda}} in nonmesonic hypernuclear decay {Lambda}N{yields}nN, and introduce the effect of final-state interactions. The primary nonmesonic weak hyperon-nucleon decay process is described through the independent-particle shell model. We work within the 2p1h subspace of final states, assuming a simple approach for finite nuclei based on the eikonal approximation. An optical potential including the nucleon-nucleus isoscalar and isovector interactions is introduced to take into account the minimum nuclear-medium effects. The calculated values for {sub {Lambda}}{sup 5}He and {sub {Lambda}}{sup 12}C show that our treatment of final-state interactions, even those considered as restricted to a subspace of states, brings the independent-particle model results closer to the experimental data.

• OSTI ID: 21499304
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 82; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
APPROXIMATIONS
ASYMMETRY
BARYONS
CALCULATION METHODS
EIKONAL APPROXIMATION
ELEMENTARY PARTICLES
FERMIONS
FINAL-STATE INTERACTIONS
HADRONS
HYPERONS
INTERACTIONS
ISOVECTORS
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEI
NUCLEONS
PARTICLES
SHELL MODELS
SINGLE-PARTICLE MODEL
STRANGE PARTICLES
TENSORS
VECTORS