Elsevier

Physics Letters B

Volume 110, Issue 6, 15 April 1982, Pages 428-432
Physics Letters B

Experimental observation of the Σ hypernuclei, Σ6H and Σ16C

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Abstract

The hypernuclei Σ6H and Σ16C were observed by the (K, π+) reaction on targets of 6Li and liquid O, respectively, at 713 MeV/c incident K momentum. Structure is seen in Σ6H which may be interpreted in terms of particle-hole excitations similar to the previously observed states in Λ6Li. The inablitity to resolve individual Σ hypernuclear levels in Σ16C, due in part to the excitation of non-coherent states as a result of the large momentum transfer of about 130 MeV/c, precludes the extraction of the Σ-nucleus spin-orbit potential strength. The Σ-nucleus well depth appears to be 7 to 10 MeV less than that for the Λ.

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    Nowadays more than 40 single Λ-hypernuclei, and few double-Λ [5–11,15] and single-Ξ [16,17] ones have been identified. On the contrary, it has not been possible to prove without any ambiguity the existence of Σ-hypernuclei (see e.g., Refs. [18–26]) which suggest that the Σ-nucleon interaction is most probably repulsive [27–36]. A simple theoretical description of Λ-hypernuclei consist of an ordinary nuclei with the Λ sitting in the single-particle states of an effective Λ-nucleus mean field potential.

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Research supported by the US DOE under Contracts DE AS05-76ERO-3948, DE-AC02-76CHO-0016, DEAC02-76RO-3244, and ED-AC02-77ERO-4195.

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