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Phys. Rev. C 73, 012501(R) (2006) [5 pages]

Cascade gamma decay in the <sub>Lambda</sub><sup>7</sup>Li hypernucleus

M. Ukai,1 S. Ajimura,2 H. Akikawa,3 D. E. Alburger,4 A. Banu,5 R. E. Chrien,4 G. B. Franklin,6 J. Franz,7 O. Hashimoto,1 T. Hayakawa,2 H. Hotchi,4 K. Imai,3 T. Kishimoto,2 M. May,4 D. J. Millener,4 S. Minami,2 Y. Miura,1 T. Miyoshi,1 K. Mizunuma,1 T. Nagae,8 S. N. Nakamura,1 K. Nakazawa,9 Y. Okayasu,1 P. Pile,4 B. P. Quinn,6 A. Rusek,4 Y. Sato,8 R. Sutter,4 H. Takahashi,3 L. Tang,10 H. Tamura,1 K. Tanida,11 L. Yuan,10 and S. H. Zhou12

(E930('01) Collaboration)

1Department of Physics, Tohoku University, Sendai 980-8578, Japan
2Department of Physics, Osaka University, Toyonaka 560-0043, Japan
3Department of Physics, Kyoto University, Kyoto 606-8502, Japan
4Brookhaven National Laboratory, Upton, New York 11973, USA
5GSI, Darmstadt D-64291, Germany
6Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
7Department of Physics, University of Freiburg, Freiburg D-79104, Germany
8Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801, Japan
9Department of Physics, Gifu University, Gifu 501-1193, Japan
10Department of Physics, Hampton University, Hampton, Virginia 23668, USA
11RIKEN, Wako 351-0198, Japan
12Department of Physics, China Institute of Atomic Energy, P.O. Box 275(80), Beijing 102413, China
Rapid Received 3 December 2004; published 27 January 2006

In a gamma-ray spectroscopy experiment with the (K-,pi-) reaction on a 10B target, we have observed the 7/2+-->5/2+ spin-flip M1 transition in <sub>Lambda</sub><sup>7</sup>Li via gamma-gamma coincidence with the 5/2+-->1/2+E2 transition. This is the first successful gamma-gamma coincidence measurement for hypernuclei. The measured M1   gamma-ray energy is 470.8±1.9(stat)±0.6(syst) keV. The spacing of the 7/2+,5/2+ doublet is consistently explained using the strengths of the spin-spin, Lambda-spin-orbit, and tensor interactions obtained from previous gamma-spectroscopy experiments.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.73.012501
DOI: 10.1103/PhysRevC.73.012501
PACS: 21.80.+a; 13.75.Ev; 23.20.Lv; 25.80.Nv
  • 21.80.+a
    Hypernuclei
  • 13.75.Ev
    Hyperon–nucleon interactions (energy<=10 GeV)
  • 23.20.Lv
    Nuclear gamma transitions and level energies
  • 25.80.Nv
    Kaon-induced nuclear reactions
  • YEAR: 2006
KEYWORDS: nuclei with mass number 6 to 19, hypernuclei, gamma-ray spectra, kaon-nucleus reactions, high spin states, nuclear cascades, spin-orbit interactions

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