Relation between shrinkage effect and compression of the rotational spectrum in the Λ7Li hypernucleus

K. Hagino, T. Koike

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

It has been shown experimentally that the 6Li nucleus shrinks by adding a Λ particle while its spectrum is also compressed. We discuss the compatibility of these two effects, contrasting also with a relation between the shrinkage effect and the stability of the spectrum in the Λ9Be hypernucleus. To this end, we employ two-body d-Λ5He and α-Λ5He cluster models for the Λ7Li and Λ9Be hypernuclei, respectively. We first argue that a Gaussian-like interaction between two clusters leads to a stabilization of the spectrum against an addition of a Λ particle, even though the intercluster distance is reduced. In the case of Λ7Li, the spin-orbit interaction between the intercluster motion and the deuteron spin has to be considered also. We show that the shrinkage effect makes the expectation value of the spin-orbit potential larger, lowering the excitation energy for the 6Li(3+)- Λ(1/2+) level.

Original languageEnglish
Article number064325
JournalPhysical Review C - Nuclear Physics
Volume84
Issue number6
DOIs
Publication statusPublished - 2011 Dec 27

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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