Experimental observation of the Σ hypernuclei, Σ6H and Σ16C

H. Piekarz, S. Bart, R. Hackenburg, A. D. Hancock, E. V. Hungerford, B. Mayes, K. Sekharan, J. Piekarz, M. Deutsch, R. E. Chrien, S. Chen, M. LeVine, D. Maurizio, M. May, H. Palevsky, Y. Xu, P. D. Barnes, B. Basslleck, R. Eisenstein, R. GraceC. Maher, P. Pile, R. Rieder, W. Wharton, R. L. Stearns

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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.

Original languageEnglish
Pages (from-to)428-432
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number6
StatePublished - 15 Apr 1982
Externally publishedYes

Bibliographical note

Funding Information:
Bertlm et al. \[1\] have recently reported the observation of structure m the (K-, 7r-) reaction on 9Be near the ~ threshold. This spectrum may be interpreted as extubltmg two narrow states of width smaller than 8 MeV. The possibdlty of narrow Z-hypernu-clear states has led to renewed theoretical interest m the structure and width of such levels, with the hope of obtaining hyperon-nuclear potential reformation simdar to that extracted from the now well studied A-hypernuclel \[2-6\].I n order to verify and expand the knowledge of 1C hypernuclel the Brookhaven hypernu- ¢~ Research supported by the US DOE under Contracts DE AS05-76ERO-3948, DE-AC02-76CHO-0016, DEAC02-76ERO-3244, and ED-AC02-77ERO-4195.


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