TY - JOUR
T1 - Lifetime measurements of medium-heavy Λ hypernuclei
AU - Park, H.
AU - Bhang, H.
AU - Youn, M.
AU - Hashimoto, O.
AU - Maeda, Kazushige
AU - Sato, Y.
AU - Takahashi, T.
AU - Aoki, K.
AU - Kim, Y. D.
AU - Noumi, H.
AU - Omata, K.
AU - Outa, H.
AU - Sekimoto, M.
AU - Shibata, T.
AU - Hasegawa, T.
AU - Hotchi, H.
AU - Ohta, Y.
AU - Ajimura, S.
AU - Kishimoto, T.
PY - 2000/1/1
Y1 - 2000/1/1
N2 - We have measured the lifetimes of the weak decay of 12ΛC, 28ΛSi, and 56ΛFe hypernuclei which were produced via a (π+,K+) reaction at KEK 12-GeV PS. The lifetimes were obtained by direct measurement of the production and decay time of the hypernucleus using a fast timing counter system whose time resolution was about 83 ps. Our results for the lifetimes of 12ΛC, 28ΛSi, and ΛFe are 231 ±15, 206±11, and 215±14 ps, respectively. The lifetimes of 11ΛB and 27ΛA1 with the application of the gate to the pΛ state of the formation spectra of 12ΛC and 28ΛSi were also determined to be 211±13 and 203±10 ps. From the present work, it was found that the total decay width saturates according to the hypernuclear mass number even at A∼12. This suggests the importance of the proper treatment of the short range nature of the nonmesonic decay of A hypernuclei.
AB - We have measured the lifetimes of the weak decay of 12ΛC, 28ΛSi, and 56ΛFe hypernuclei which were produced via a (π+,K+) reaction at KEK 12-GeV PS. The lifetimes were obtained by direct measurement of the production and decay time of the hypernucleus using a fast timing counter system whose time resolution was about 83 ps. Our results for the lifetimes of 12ΛC, 28ΛSi, and ΛFe are 231 ±15, 206±11, and 215±14 ps, respectively. The lifetimes of 11ΛB and 27ΛA1 with the application of the gate to the pΛ state of the formation spectra of 12ΛC and 28ΛSi were also determined to be 211±13 and 203±10 ps. From the present work, it was found that the total decay width saturates according to the hypernuclear mass number even at A∼12. This suggests the importance of the proper treatment of the short range nature of the nonmesonic decay of A hypernuclei.
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M3 - Article
AN - SCOPUS:12944291518
VL - 61
SP - 540041
EP - 5400411
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
SN - 0556-2813
IS - 5
M1 - 054004
ER -