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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 | Abstract: | The 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 | Services: | Forum | Review | PDF | Favorites |
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