7λLi ground-state spin determined by the yield of γ-rays subsequent to weak decay

J. Sasao; D. Abe; H. Akikawa; K. Araki; H. Bhang; T. Endo; Y. Fujii; T. Fukuda; O. Hashimoto; K. Imai; H. Hotchi; Y. Kakiguchi; J. H. Kim; Y. D. Kim; T. Miyoshi; T. Murakami; T. Nagae; H. Noumi; H. Outa; K. Ozawa; T. Saito; Y. Sato; S. Satoh; R. Sawafta; M. Sekimoto; T. Takahashi; H. Tamura; L. Tang; K. Tanida; H. H. Xia; S. H. Zhou; L. H. Zhu

doi:10.1016/j.physletb.2003.11.022

⁷_λLi ground-state spin determined by the yield of γ-rays subsequent to weak decay

J. Sasao^*
, D. Abe
, H. Akikawa
, K. Araki
, H. Bhang
, T. Endo
, Y. Fujii
, T. Fukuda
, O. Hashimoto
, K. Imai
, H. Hotchi
, Y. Kakiguchi
, J. H. Kim
, Y. D. Kim
, T. Miyoshi
, T. Murakami
, T. Nagae
, H. Noumi
, H. Outa
, K. Ozawa

T. Saito, Y. Sato, S. Satoh, R. Sawafta, M. Sekimoto, T. Takahashi, H. Tamura, L. Tang, K. Tanida, H. H. Xia, S. H. Zhou, L. H. Zhu

^*此作品的通讯作者

Tohoku University
Kyoto University
Japan Atomic Energy Agency
Seoul National University
High Energy Accelerator Research Organization, Institute of Particle and Nuclear Physics
Osaka Electro-Communication University
The University of Tokyo
Sejong University
University of Houston
RIKEN
North Carolina A&T State University
Hampton University
China National Nuclear Corporation

科研成果: 期刊稿件 › 文章 › 同行评审

25 引用（Scopus）

摘要

Using a large-acceptance germanium detector array (Hyperball), we measured a γ-ray spectrum in coincidence with production of ⁷ _λLi bound states in the ⁷Li(π⁺, K⁺) reaction. We observed a γ-ray peak at 429 keV due to the transition from the first excited state of ⁷Be produced by the weak decay of ⁷_λLi, ⁷_λLi → ⁷Be*(1/2^-, 429 keV) + π^-. From the yield of this γ-ray, the branching ratio of the ⁷ _λLi weak decay to ⁷Be*(429) was obtained to be (6.0_-1.6^+1.3) x 10^-2. Compared with theoretically calculated values of the partial decay rates, the measurement indicates that the ground-state spin of ⁷_λLi is 1/ 2 but not 3/2.

源语言	英语
页（从-至）	258-264
页数	7
期刊	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
卷	579
期	3-4
DOI	https://doi.org/10.1016/j.physletb.2003.11.022
出版状态	已出版 - 22 1月 2004
已对外发布	是

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10.1016/j.physletb.2003.11.022

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Sasao, J., Abe, D., Akikawa, H., Araki, K., Bhang, H., Endo, T., Fujii, Y., Fukuda, T., Hashimoto, O., Imai, K., Hotchi, H., Kakiguchi, Y., Kim, J. H., Kim, Y. D., Miyoshi, T., Murakami, T., Nagae, T., Noumi, H., Outa, H., ... Zhu, L. H. (2004). ⁷_λLi ground-state spin determined by the yield of γ-rays subsequent to weak decay. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 579(3-4), 258-264. https://doi.org/10.1016/j.physletb.2003.11.022

@article{5bd4c8a3d539408db988b05a129f7223,

title = "7λLi ground-state spin determined by the yield of γ-rays subsequent to weak decay",

abstract = "Using a large-acceptance germanium detector array (Hyperball), we measured a γ-ray spectrum in coincidence with production of 7 λLi bound states in the 7Li(π+, K+) reaction. We observed a γ-ray peak at 429 keV due to the transition from the first excited state of 7Be produced by the weak decay of 7λLi, 7λLi → 7Be*(1/2-, 429 keV) + π-. From the yield of this γ-ray, the branching ratio of the 7 λLi weak decay to 7Be*(429) was obtained to be (6.0-1.6+1.3) x 10-2. Compared with theoretically calculated values of the partial decay rates, the measurement indicates that the ground-state spin of 7λLi is 1/ 2 but not 3/2.",

keywords = "Mesonic decay, Λ hypemuclei, ΛN interaction, γ spectroscopy",

author = "J. Sasao and D. Abe and H. Akikawa and K. Araki and H. Bhang and T. Endo and Y. Fujii and T. Fukuda and O. Hashimoto and K. Imai and H. Hotchi and Y. Kakiguchi and Kim, \{J. H.\} and Kim, \{Y. D.\} and T. Miyoshi and T. Murakami and T. Nagae and H. Noumi and H. Outa and K. Ozawa and T. Saito and Y. Sato and S. Satoh and R. Sawafta and M. Sekimoto and T. Takahashi and H. Tamura and L. Tang and K. Tanida and Xia, \{H. H.\} and Zhou, \{S. H.\} and Zhu, \{L. H.\}",

year = "2004",

month = jan,

day = "22",

doi = "10.1016/j.physletb.2003.11.022",

language = "英语",

volume = "579",

pages = "258--264",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "3-4",

}

Sasao, J, Abe, D, Akikawa, H, Araki, K, Bhang, H, Endo, T, Fujii, Y, Fukuda, T, Hashimoto, O, Imai, K, Hotchi, H, Kakiguchi, Y, Kim, JH, Kim, YD, Miyoshi, T, Murakami, T, Nagae, T, Noumi, H, Outa, H, Ozawa, K, Saito, T, Sato, Y, Satoh, S, Sawafta, R, Sekimoto, M, Takahashi, T, Tamura, H, Tang, L, Tanida, K, Xia, HH, Zhou, SH & Zhu, LH 2004, '⁷_λLi ground-state spin determined by the yield of γ-rays subsequent to weak decay', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷 579, 号码 3-4, 页码 258-264. https://doi.org/10.1016/j.physletb.2003.11.022

TY - JOUR

T1 - 7λLi ground-state spin determined by the yield of γ-rays subsequent to weak decay

AU - Sasao, J.

AU - Abe, D.

AU - Akikawa, H.

AU - Araki, K.

AU - Bhang, H.

AU - Endo, T.

AU - Fujii, Y.

AU - Fukuda, T.

AU - Hashimoto, O.

AU - Imai, K.

AU - Hotchi, H.

AU - Kakiguchi, Y.

AU - Kim, J. H.

AU - Kim, Y. D.

AU - Miyoshi, T.

AU - Murakami, T.

AU - Nagae, T.

AU - Noumi, H.

AU - Outa, H.

AU - Ozawa, K.

AU - Saito, T.

AU - Sato, Y.

AU - Satoh, S.

AU - Sawafta, R.

AU - Sekimoto, M.

AU - Takahashi, T.

AU - Tamura, H.

AU - Tang, L.

AU - Tanida, K.

AU - Xia, H. H.

AU - Zhou, S. H.

AU - Zhu, L. H.

PY - 2004/1/22

Y1 - 2004/1/22

N2 - Using a large-acceptance germanium detector array (Hyperball), we measured a γ-ray spectrum in coincidence with production of 7 λLi bound states in the 7Li(π+, K+) reaction. We observed a γ-ray peak at 429 keV due to the transition from the first excited state of 7Be produced by the weak decay of 7λLi, 7λLi → 7Be*(1/2-, 429 keV) + π-. From the yield of this γ-ray, the branching ratio of the 7 λLi weak decay to 7Be*(429) was obtained to be (6.0-1.6+1.3) x 10-2. Compared with theoretically calculated values of the partial decay rates, the measurement indicates that the ground-state spin of 7λLi is 1/ 2 but not 3/2.

AB - Using a large-acceptance germanium detector array (Hyperball), we measured a γ-ray spectrum in coincidence with production of 7 λLi bound states in the 7Li(π+, K+) reaction. We observed a γ-ray peak at 429 keV due to the transition from the first excited state of 7Be produced by the weak decay of 7λLi, 7λLi → 7Be*(1/2-, 429 keV) + π-. From the yield of this γ-ray, the branching ratio of the 7 λLi weak decay to 7Be*(429) was obtained to be (6.0-1.6+1.3) x 10-2. Compared with theoretically calculated values of the partial decay rates, the measurement indicates that the ground-state spin of 7λLi is 1/ 2 but not 3/2.

KW - Mesonic decay

KW - Λ hypemuclei

KW - ΛN interaction

KW - γ spectroscopy

UR - https://www.scopus.com/pages/publications/0346655354

U2 - 10.1016/j.physletb.2003.11.022

DO - 10.1016/j.physletb.2003.11.022

M3 - 文章

AN - SCOPUS:0346655354

SN - 0370-2693

VL - 579

SP - 258

EP - 264

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 3-4

ER -

7λLi ground-state spin determined by the yield of γ-rays subsequent to weak decay

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⁷_λLi ground-state spin determined by the yield of γ-rays subsequent to weak decay