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, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 83; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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ELEMENTARY PARTICLES
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ENERGY RANGE
FERMIONS
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GROUND STATES
HADRONS
HYPERNUCLEI
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ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MIXING
NEUTRONS
NUCLEAR FRAGMENTS
NUCLEAR MODELS
NUCLEI
NUCLEONS
PERTURBATION THEORY
PROBABILITY
SHELL MODELS