Lifetime measurements of medium-heavy Λ hypernuclei

H. Park; H. Bhang; M. Youn; O. Hashimoto; Kazushige Maeda; Y. Sato; T. Takahashi; K. Aoki; Y. D. Kim; H. Noumi; K. Omata; H. Outa; M. Sekimoto; T. Shibata; T. Hasegawa; H. Hotchi; Y. Ohta; S. Ajimura; T. Kishimoto

Lifetime measurements of medium-heavy Λ hypernuclei

H. Park, H. Bhang, M. Youn, O. Hashimoto, Kazushige Maeda, Y. Sato, T. Takahashi, K. Aoki, Y. D. Kim, H. Noumi, K. Omata, H. Outa, M. Sekimoto, T. Shibata, T. Hasegawa, H. Hotchi, Y. Ohta, S. Ajimura, T. Kishimoto

SCI - Physics

Research output: Contribution to journal › Article › peer-review

54 Citations (Scopus)

Abstract

We have measured the lifetimes of the weak decay of ¹²_ΛC, ²⁸_ΛSi, and ⁵⁶_ΛFe 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 ¹²_ΛC, ²⁸_ΛSi, and _ΛFe are 231 ±15, 206±11, and 215±14 ps, respectively. The lifetimes of ¹¹_ΛB and ²⁷_ΛA1 with the application of the gate to the p_Λ state of the formation spectra of ¹²_ΛC and ²⁸_ΛSi 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.

Original language	English
Article number	054004
Pages (from-to)	540041-5400411
Number of pages	4860371
Journal	Physical Review C - Nuclear Physics
Volume	61
Issue number	5
Publication status	Published - 2000 Jan 1

ASJC Scopus subject areas

Nuclear and High Energy Physics

Cite this

Lifetime measurements of medium-heavy Λ hypernuclei. / Park, H.; Bhang, H.; Youn, M.; Hashimoto, O.; Maeda, Kazushige; Sato, Y.; Takahashi, T.; Aoki, K.; Kim, Y. D.; Noumi, H.; Omata, K.; Outa, H.; Sekimoto, M.; Shibata, T.; Hasegawa, T.; Hotchi, H.; Ohta, Y.; Ajimura, S.; Kishimoto, T.

In: Physical Review C - Nuclear Physics, Vol. 61, No. 5, 054004, 01.01.2000, p. 540041-5400411.

Research output: Contribution to journal › Article › peer-review

Park, H. ; Bhang, H. ; Youn, M. ; Hashimoto, O. ; Maeda, Kazushige ; Sato, Y. ; Takahashi, T. ; Aoki, K. ; Kim, Y. D. ; Noumi, H. ; Omata, K. ; Outa, H. ; Sekimoto, M. ; Shibata, T. ; Hasegawa, T. ; Hotchi, H. ; Ohta, Y. ; Ajimura, S. ; Kishimoto, T. / Lifetime measurements of medium-heavy Λ hypernuclei. In: Physical Review C - Nuclear Physics. 2000 ; Vol. 61, No. 5. pp. 540041-5400411.

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title = "Lifetime measurements of medium-heavy Λ hypernuclei",

abstract = "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.",

author = "H. Park and H. Bhang and M. Youn and O. Hashimoto and Kazushige Maeda and Y. Sato and T. Takahashi and K. Aoki and Kim, {Y. D.} and H. Noumi and K. Omata and H. Outa and M. Sekimoto and T. Shibata and T. Hasegawa and H. Hotchi and Y. Ohta and S. Ajimura and T. Kishimoto",

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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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Lifetime measurements of medium-heavy Λ hypernuclei

Abstract

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