Doublet-spacing enhancement caused by {Lambda}N-{Sigma}N coupling in {sub {Lambda}L}i hypernuclear isotopes
- Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198 (Japan)
We theoretically investigate energy spacings of doublets in {sub {Lambda}L}i hypernuclear isotopes with A=7-10 in shell-model calculations with a {Lambda}N-{Sigma}N coupling effect. The calculated results show that the energy shifts are {Delta}{epsilon}=0.09-0.28 MeV and the {Sigma}-mixing probabilities are P{sub {Sigma}}=0.10%-0.34% in {Lambda} ground states for the isotopes because of the {Lambda}N-{Sigma}N coupling in the first-order perturbation. It is found that the energy spacing of the doublet is enhanced as a neutron number N increases; the contribution of the {Lambda}N-{Sigma}N coupling interaction is comparable to that of the {Lambda}N interaction in the neutron-rich {Lambda} hypernuclei. The coherent mechanism of this doublet-spacing enhancement is also discussed in terms of Fermi-type and Gamow-Teller-type {Lambda}N-{Sigma}N couplings.
- OSTI ID:
- 21499479
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevC.83.034310; (c) 2011 American Institute of Physics; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COUPLING
COUPLINGS
DISTURBANCES
GAMOW-TELLER RULES
GROUND STATES
HYPERNUCLEI
INTERACTIONS
ISOTOPES
MEV RANGE
MIXING
NEUTRONS
PERTURBATION THEORY
PROBABILITY
SHELL MODELS
BARYONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
FERMIONS
HADRONS
MATHEMATICAL MODELS
NUCLEAR FRAGMENTS
NUCLEAR MODELS
NUCLEI
NUCLEONS