Role of ground-state correlations in hypernuclear nonmesonic weak decay

Journal Article · Tue Jun 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.064315· OSTI ID:21388590

Bauer, E ^[1]; Garbarino, G ^[2]

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1. Departamento de Fisica, Universidad Nacional de La Plata, C. C. 67, 1900 La Plata (Argentina)
2. Dipartimento di Fisica Teorica, Universita di Torino, and INFN, Sezione di Torino, I-10125 Torino (Italy)

The contribution of ground-state correlations (GSCs) to the nonmesonic weak decay of {sub L}AMBDA{sup 12}C and other medium to heavy hypernuclei is studied within a nuclear-matter formalism implemented in a local-density approximation. We adopt a weak transition potential including the exchange of the complete octets of pseudoscalar and vector mesons, as well as a residual strong interaction modeled on the Bonn potential. Leading GSC contributions, at first order in the residual strong interaction, are introduced on the same footing for all isospin channels of one- and two-nucleon induced decays. Together with fermion antisymmetrization, GSCs turn out to be important for an accurate determination of the decay widths. Besides opening the two-nucleon stimulated decay channels, for {sub L}AMBDA{sup 12}C GSCs are responsible for 14% of the rate GAMMA{sub 1} while increasing the GAMMA{sub n}/GAMMA{sub p} ratio by 4%. Our final results for {sub L}AMBDA{sup 12}C are GAMMA{sub NM}=0.98, GAMMA{sub n}/GAMMA{sub p}=0.34, and GAMMA{sub 2}/GAMMA{sub NM}=0.26. The saturation property of GAMMA{sub NM} with increasing hypernuclear mass number is clearly observed. The agreement with data of our predictions for GAMMA{sub NM}, GAMMA{sub n}/GAMMA{sub p}, and GAMMA{sub 2} is rather good.

• OSTI ID: 21388590
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 81; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
APPROXIMATIONS
BARYONS
BASIC INTERACTIONS
BOSONS
CALCULATION METHODS
CARBON 12
CARBON ISOTOPES
CORRELATIONS
DENSITY
ELEMENTARY PARTICLES
ENERGY LEVELS
EVEN-EVEN NUCLEI
FERMIONS
FORECASTING
GROUND STATES
HADRONS
HYPERNUCLEI
INTERACTIONS
ISOSPIN
ISOTOPES
LIGHT NUCLEI
MASS NUMBER
MATTER
MESONS
NUCLEAR FRAGMENTS
NUCLEAR MATTER
NUCLEI
NUCLEONS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
SATURATION
STABLE ISOTOPES
STRONG INTERACTIONS
VECTOR MESONS