Four-body cluster structure of a = 7-10 double-Λ hypernuclei

Emiko Hiyama, M. Kamimura, T. Motoba, T. Yamada, Y. Yamamoto

Research output: Contribution to journalArticle

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Abstract

Energy levels of the double-Λ hypernuclei ΛΛ7 He, ΛΛ7 Li, ΛΛ8 Li, ΛΛ9 Li, ΛΛ9 Be, and ΛΛ10 Be are predicted on the basis of an α+x+Λ+Λ four-body model, where x = n, p, d, t, 3He, and α, respectively. Interactions between the constituent particles are determined so as to reproduce reasonably the observed low-energy properties of the α+x nuclei (5He, 5Li, 6Li, 7Li, 7Be, 8Be) and the existing data for Λ-binding energies of the x + Λ and α+x+Λ systems (Λ3H, Λ4H, Λ5He, Λ6He, Λ6Li, Λ8Li, Λ8Be, Λ9 Be). An effective ΛΛ interaction is constructed so as to reproduce, within the α+Λ+Λ model, the BΛΛ of ΛΛ6 He, which was extracted from the emulsion experiment, the NAGARA event. With no adjustable parameters for the α+x+Λ+Λ system, BΛΛ of ground and bound excited states of the double-Λ hypernuclei with A=7-10 are calculated within the Gaussian-basis coupled-rearrangement-channel method. The Demachi-Yanagi event, identified recently as ΛΛ10Be, is interpreted as an observation of its 2+ excited state on the basis of the present calculation. Structural changes in the α + x core nuclei, due to the interaction of the Λ particles, are found to be substantial, and these play an important role in estimating the ΛΛ bond energies of those hypernuclei.

Original languageEnglish
Article number024007
Pages (from-to)240071-2400713
Number of pages2160643
JournalPhysical Review C - Nuclear Physics
Volume66
Issue number2
DOIs
Publication statusPublished - Aug 1 2002

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hypernuclei
nuclei
interactions
emulsions
excitation
estimating
binding energy
energy levels
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Hiyama, E., Kamimura, M., Motoba, T., Yamada, T., & Yamamoto, Y. (2002). Four-body cluster structure of a = 7-10 double-Λ hypernuclei. Physical Review C - Nuclear Physics, 66(2), 240071-2400713. [024007]. https://doi.org/10.1103/PhysRevC.66.024007

Four-body cluster structure of a = 7-10 double-Λ hypernuclei. / Hiyama, Emiko; Kamimura, M.; Motoba, T.; Yamada, T.; Yamamoto, Y.

In: Physical Review C - Nuclear Physics, Vol. 66, No. 2, 024007, 01.08.2002, p. 240071-2400713.

Research output: Contribution to journalArticle

Hiyama, E, Kamimura, M, Motoba, T, Yamada, T & Yamamoto, Y 2002, 'Four-body cluster structure of a = 7-10 double-Λ hypernuclei', Physical Review C - Nuclear Physics, vol. 66, no. 2, 024007, pp. 240071-2400713. https://doi.org/10.1103/PhysRevC.66.024007
Hiyama, Emiko ; Kamimura, M. ; Motoba, T. ; Yamada, T. ; Yamamoto, Y. / Four-body cluster structure of a = 7-10 double-Λ hypernuclei. In: Physical Review C - Nuclear Physics. 2002 ; Vol. 66, No. 2. pp. 240071-2400713.
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