TY - JOUR

T1 - Four-body cluster structure of [Formula Presented] double-Λ hypernuclei

AU - Hiyama, E.

AU - Kamimura, M.

AU - Motoba, T.

AU - Yamada, T.

AU - Yamamoto, Y.

PY - 2002

Y1 - 2002

N2 - Energy levels of the double-Λ hypernuclei [Formula Presented] [Formula Presented] [Formula Presented] and [Formula Presented] are predicted on the basis of an [Formula Presented] four-body model, where [Formula Presented] and [Formula Presented] respectively. Interactions between the constituent particles are determined so as to reproduce reasonably the observed low-energy properties of the [Formula Presented] nuclei [Formula Presented] and the existing data for Λ-binding energies of the [Formula Presented] and [Formula Presented] systems [Formula Presented] An effective ΛΛ interaction is constructed so as to reproduce, within the α+Λ+Λ model, the [Formula Presented] of [Formula Presented] which was extracted from the emulsion experiment, the NAGARA event. With no adjustable parameters for the [Formula Presented] system, [Formula Presented] of ground and bound excited states of the double-Λ hypernuclei with [Formula Presented] are calculated within the Gaussian-basis coupled-rearrangement-channel method. The Demachi-Yanagi event, identified recently as [Formula Presented] is interpreted as an observation of its [Formula Presented] excited state on the basis of the present calculation. Structural changes in the [Formula Presented] 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.

AB - Energy levels of the double-Λ hypernuclei [Formula Presented] [Formula Presented] [Formula Presented] and [Formula Presented] are predicted on the basis of an [Formula Presented] four-body model, where [Formula Presented] and [Formula Presented] respectively. Interactions between the constituent particles are determined so as to reproduce reasonably the observed low-energy properties of the [Formula Presented] nuclei [Formula Presented] and the existing data for Λ-binding energies of the [Formula Presented] and [Formula Presented] systems [Formula Presented] An effective ΛΛ interaction is constructed so as to reproduce, within the α+Λ+Λ model, the [Formula Presented] of [Formula Presented] which was extracted from the emulsion experiment, the NAGARA event. With no adjustable parameters for the [Formula Presented] system, [Formula Presented] of ground and bound excited states of the double-Λ hypernuclei with [Formula Presented] are calculated within the Gaussian-basis coupled-rearrangement-channel method. The Demachi-Yanagi event, identified recently as [Formula Presented] is interpreted as an observation of its [Formula Presented] excited state on the basis of the present calculation. Structural changes in the [Formula Presented] 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.

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U2 - 10.1103/PhysRevC.66.024007

DO - 10.1103/PhysRevC.66.024007

M3 - Article

AN - SCOPUS:85035288182

VL - 66

SP - 13

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 2

ER -