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. OzawaT. 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

SCI - Physics

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

24 Citations (Scopus)

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 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.

Original language	English
Pages (from-to)	258-264
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	579
Issue number	3-4
DOIs	https://doi.org/10.1016/j.physletb.2003.11.022
Publication status	Published - 2004 Jan 22

Keywords

Mesonic decay
Λ hypemuclei
ΛN interaction
γ spectroscopy

ASJC Scopus subject areas

Nuclear and High Energy Physics

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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

⁷_λLi ground-state spin determined by the yield of γ-rays subsequent to weak decay. / 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.; Ozawa, K.; Saito, T.; Sato, Y.; Satoh, S.; Sawafta, R.; Sekimoto, M.; Takahashi, T.; Tamura, H.; Tang, L.; Tanida, K.; Xia, H. H.; Zhou, S. H.; Zhu, L. H.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 579, No. 3-4, 22.01.2004, p. 258-264.

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

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, vol. 579, no. 3-4, pp. 258-264. https://doi.org/10.1016/j.physletb.2003.11.022

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. ; Ozawa, K. ; Saito, T. ; Sato, Y. ; Satoh, S. ; Sawafta, R. ; Sekimoto, M. ; Takahashi, T. ; Tamura, H. ; Tang, L. ; Tanida, K. ; Xia, H. H. ; Zhou, S. H. ; Zhu, L. H. / ⁷_λLi ground-state spin determined by the yield of γ-rays subsequent to weak decay. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2004 ; Vol. 579, No. 3-4. pp. 258-264.

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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.}",

note = "Funding Information: The authors thank K. Nakamura and the KEK-PS staff for support of the experiment. They are also grateful to T. Motoba for discussion of the result. This work is supported by Grant-In-Aid for Scientific Research from The Ministry of Education of Japan, Nos. 08239102 and 11440070.",

year = "2004",

month = jan,

day = "22",

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

language = "English",

volume = "579",

pages = "258--264",

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

issn = "0370-2693",

publisher = "Elsevier",

number = "3-4",

}

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.

N1 - Funding Information: The authors thank K. Nakamura and the KEK-PS staff for support of the experiment. They are also grateful to T. Motoba for discussion of the result. This work is supported by Grant-In-Aid for Scientific Research from The Ministry of Education of Japan, Nos. 08239102 and 11440070.

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

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U2 - 10.1016/j.physletb.2003.11.022

DO - 10.1016/j.physletb.2003.11.022

M3 - Article

AN - SCOPUS:0346655354

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

SN - 0370-2693

IS - 3-4

ER -