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29 March 2024
 
  » arxiv » 1212.1133

 Article overview


Direct Measurements of the Lifetime of Heavy Hypernuclei
X. Qiu ; L. Tang ; A. Margaryan ; P. Achenbach ; A. Ahmidouch ; I. Albayrak ; D. Androic ; A. Asaturyan ; R. Asaturyan ; O. Ates ; R. Badui ; P. Baturin ; W. Boeglin ; J. Bono ; E. Brash ; P. Carter ; C. Chen ; X. Chen ; A. Chiba ; E. Christy ; M. M. Dalton ; S. Danagoulian ; R. De Leo ; D. Doi ; M. Elaasar ; R. Ent ; H. Fenker ; Y. Fujii ; M. Furic ; M. Gabrielyan ; L. Gan ; F. Garibaldi ; D. Gaskell ; A. Gasparian ; T. Gogami ; O. Hashimoto ; T. Horn ; B. Hu ; E. V. Hungerford ; M. Jones ; H. Kanda ; M. Kaneta ; M. Kawai ; D. Kawama ; H. Khanal ; M. Kohl ; A. Liyanage ; W. Luo ; K. Maeda ; P. Markowitz ; T. Maruta ; A. Matsumura ; V. Maxwell ; A. Mkrtchyan ; H. Mkrtchyan ; S. Nagao ; S. N. Nakamura ; A. Narayan ; C. Neville ; G. Niculescu ; M. I. Niculescu ; A. Nunez ; Nuruzzaman ; Y. Okayasu ; T. Petkovic ; J. Pochodzalla ; J. Reinhold ; V. M. Rodriguez ; C. Samanta ; B. Sawatzky ; T. Seva ; A. Shichijo ; V. Tadevosyan ; N. Taniya ; K. Tsukada ; M. Veilleux ; W. Vulcan ; F. R. Wesselmann ; S. A. Wood ; L. Ya ; T. Yamamoto ; Z. Ye ; K. Yokota ; L. Yuan ; S. Zhamkochyan ; L. Zhu ;
Date 5 Dec 2012
AbstractThe lifetime of a Lambda particle embedded in a nucleus (hypernucleus) decreases from that of free Lambda decay due to the opening of the Lambda N to NN weak decay channel. However, it is generally believed that the lifetime of a hypernucleus attains a constant value (saturation) for medium to heavy hypernuclear masses, yet this hypothesis has been difficult to verify. The present paper reports a direct measurement of the lifetime of medium-heavy hypernuclei produced with a photon-beam from Fe, Cu, Ag, and Bi targets. The recoiling hypernuclei were detected by a fission fragment detector using low-pressure multi-wire proportional chambers. The experiment agrees remarkably well with the only previously-measured single-species heavy-hypernucleus lifetime, that of Fe56_Lambda at KEK, and has significantly higher precision. The experiment disagrees with the measured lifetime of an unknown combination of heavy hypernuclei with 180<A<225 and, with a small statistical and systematic uncertainty, strongly favors the expected saturation of the lifetime decrease.
Source arXiv, 1212.1133
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