Lifetime Measurement of 12ΛC, 28ΛSi, and ΛFe Hypernuclei

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

doi:10.1103/PhysRevLett.81.4321

Lifetime Measurement of ¹²_ΛC, ²⁸_ΛSi, and ^_ΛFe Hypernuclei

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

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Abstract

We have measured lifetimes of Λ hypernuclei over a broad mass range explicitly identifying Λ hypernuclear production in the \(π⁺, K⁺\) reaction. The obtained results are τ\(¹²_ΛC\) = 231+/-15 ps, τ\(²⁸_ΛSi\) = 206+/-12 ps, and τ\(_ΛFe\) = 215+/-14 ps. The lifetimes of Λ hypernuclei over the mass region from carbon to iron are found almost constant at about 80% of that of free Λ within the statistical uncertainties. The short-range nature of the nonmesonic weak decay process, which is dominant in heavy Λ hypernuclei, is possibly responsible for the observed weak hypernuclear mass dependence.

Original language	English
Pages (from-to)	4321-4324
Number of pages	4
Journal	Physical review letters
Volume	81
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.81.4321
Publication status	Published - 1998 Nov 16
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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Bhang, H., Ajimura, S., Aoki, K., Hasegawa, T., Hashimoto, O., Hotchi, H., Kim, Y. D., Kishimoto, T., Maeda, K., Noumi, H., Ohta, Y., Omata, K., Outa, H., Park, H., Sato, Y., Sekimoto, M., Takahashi, T., Takahashi, T., & Youn, M. (1998). Lifetime Measurement of ¹²_ΛC, ²⁸_ΛSi, and ^_ΛFe Hypernuclei. Physical review letters, 81(20), 4321-4324. https://doi.org/10.1103/PhysRevLett.81.4321

Bhang, H, Ajimura, S, Aoki, K, Hasegawa, T, Hashimoto, O, Hotchi, H, Kim, YD, Kishimoto, T, Maeda, K, Noumi, H, Ohta, Y, Omata, K, Outa, H, Park, H, Sato, Y, Sekimoto, M, Takahashi, T, Takahashi, T & Youn, M 1998, 'Lifetime Measurement of ¹²_ΛC, ²⁸_ΛSi, and ^_ΛFe Hypernuclei', Physical review letters, vol. 81, no. 20, pp. 4321-4324. https://doi.org/10.1103/PhysRevLett.81.4321

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abstract = "We have measured lifetimes of Λ hypernuclei over a broad mass range explicitly identifying Λ hypernuclear production in the \(π+, K+\) reaction. The obtained results are τ\(12ΛC\) = 231+/-15 ps, τ\(28ΛSi\) = 206+/-12 ps, and τ\(ΛFe\) = 215+/-14 ps. The lifetimes of Λ hypernuclei over the mass region from carbon to iron are found almost constant at about 80% of that of free Λ within the statistical uncertainties. The short-range nature of the nonmesonic weak decay process, which is dominant in heavy Λ hypernuclei, is possibly responsible for the observed weak hypernuclear mass dependence.",

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AU - Bhang, H.

AU - Ajimura, S.

AU - Aoki, K.

AU - Hasegawa, T.

AU - Hashimoto, O.

AU - Hotchi, H.

AU - Kim, Y. D.

AU - Kishimoto, T.

AU - Maeda, K.

AU - Noumi, H.

AU - Ohta, Y.

AU - Omata, K.

AU - Outa, H.

AU - Park, H.

AU - Sato, Y.

AU - Sekimoto, M.

AU - Takahashi, T.

AU - Youn, M.

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N2 - We have measured lifetimes of Λ hypernuclei over a broad mass range explicitly identifying Λ hypernuclear production in the \(π+, K+\) reaction. The obtained results are τ\(12ΛC\) = 231+/-15 ps, τ\(28ΛSi\) = 206+/-12 ps, and τ\(ΛFe\) = 215+/-14 ps. The lifetimes of Λ hypernuclei over the mass region from carbon to iron are found almost constant at about 80% of that of free Λ within the statistical uncertainties. The short-range nature of the nonmesonic weak decay process, which is dominant in heavy Λ hypernuclei, is possibly responsible for the observed weak hypernuclear mass dependence.

AB - We have measured lifetimes of Λ hypernuclei over a broad mass range explicitly identifying Λ hypernuclear production in the \(π+, K+\) reaction. The obtained results are τ\(12ΛC\) = 231+/-15 ps, τ\(28ΛSi\) = 206+/-12 ps, and τ\(ΛFe\) = 215+/-14 ps. The lifetimes of Λ hypernuclei over the mass region from carbon to iron are found almost constant at about 80% of that of free Λ within the statistical uncertainties. The short-range nature of the nonmesonic weak decay process, which is dominant in heavy Λ hypernuclei, is possibly responsible for the observed weak hypernuclear mass dependence.

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Lifetime Measurement of ¹²_ΛC, ²⁸_ΛSi, and ^_ΛFe Hypernuclei

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