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APS » Journals » Phys. Rev. Lett. » Volume 51 » Issue 23
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Phys. Rev. Lett. 51, 2085–2088 (1983)

Observation of Hypernuclear Gamma-Ray Transitions in Λ7Li and Λ9Be

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M. May, S. Bart, S. Chen, R. E. Chrien, D. Maurizio, P. Pile, and Y. Xu
Brookhaven National Laboratory, Upton, New York 11973

R. Hackenburg, E. Hungerford, H. Piekarz, and Y. Xue
University of Houston, Houston, Texas 77004

M. Deutsch and J. Piekarz
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

P. D. Barnes, G. Franklin, R. Grace, C. Maher, R. Rieder, J. Szymanski, and W. Wharton
Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213

R. L. Stearns
Vassar College, Poughkeepsie, New York 12601

B. Bassalleck
University of New Mexico, Albuquerque, New Mexico 87131

B. Budick
New York University, New York, New York 10003

Received 29 September 1983; published in the issue dated 5 December 1983

γ-ray transitions of energy 2.034 ± 0.023 MeV in the hypernucleus Λ7Li and 3.079 ± 0.040 MeV in the hypernucleus Λ9Be are observed. In both cases, the energy of the γ ray in the hypernucleus ΛAZ is very close to the energy of the first excited state of the nuclear core. The γ rays are interpreted as arising from core transitions in the presence of the Λ particle. The size of the shift places limits on the strength of the ΛN spin-dependent interaction.

© 1983 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.51.2085
DOI:
10.1103/PhysRevLett.51.2085
PACS:
21.80.+a, 23.20.Lv, 25.80.Nv
 
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