gamma transitions in A = 7 hypernuclei and a possible derivation of hypernuclear size
199910 pages
Published in:
- Phys.Rev.C 59 (1999) 2351-2360
Citations per year
Abstract: (APS)
On the basis of the Λ5He+N+N three-body model which has successfully been applied to a systematic study of the energy and nucleon halo structure of the A=7 isotriplet hypernuclei, strengths of γ transitions in Λ7Li and Λ7He are calculated. The new model confirms that the B(E2;5/2+→1/2+) value in Λ7Li is reduced remarkably in comparison with the corresponding B(E2;3+→1+) in the core nucleus 6Li.This is due to the gluelike role of the Λ particle which induces a contraction of the core nuclear size. It is suggested that a measurement of the 5/2+→1/2+E2 transition rate in Λ7Li (ongoing at KEK as E419) provides a unique opportunity to derive the hypernuclear size and hence to confirm the size contraction experimentally. The E2 and M1 transition strengths are also predicted for low-lying states in the hypernucleus Λ7He whose core nucleus 6He is known to have a neutron halo. Another prediction is made of much enhanced E2 transitions in Λ7Li from the 5/2+ and 3/2+(T=1) states which are expected to have a proton halo structure.- Lambda: hypernucleus
- lithium: hypernucleus
- helium: hypernucleus
- three-body problem
- hypernucleus: wave function
- energy levels: transition
- photon: emission
- partial wave: multipole
- pi+ nucleus: nuclear reaction
- hypernucleus: hadroproduction
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