Neutron energy spectra from the nonmesonic weak decay of Λ 12C and Λ89Y hypernuclei

J. H. Kim; H. Bhang; M. J. Kim; Y. D. Kim; H. Park; S. Ajimura; T. Kishimoto; S. Minami; T. Mori; A. Sakaguchi; Y. Shimizu; M. Sumihama; T. Endo; O. Hashimoto; T. Miyoshi; J. Nishida; T. Saito; Y. Sato; S. Satoh; T. Takahashi; H. Tamura; T. Fukuda; T. Nagae; H. Noumi; H. Outa; M. Sekimoto; H. Hotchi; K. Tanida; R. Sawafta; L. I. Tang

doi:10.1103/PhysRevC.68.065201

Neutron energy spectra from the nonmesonic weak decay of Λ ¹²C and Λ⁸⁹Y hypernuclei

J. H. Kim, H. Bhang, M. J. Kim, Y. D. Kim, H. Park, S. Ajimura, T. Kishimoto, S. Minami, T. Mori, A. Sakaguchi, Y. Shimizu, M. Sumihama, T. Endo, O. Hashimoto, T. Miyoshi, J. Nishida, T. Saito, Y. Sato, S. Satoh, T. TakahashiH. Tamura, T. Fukuda, T. Nagae, H. Noumi, H. Outa, M. Sekimoto, H. Hotchi, K. Tanida, R. Sawafta, L. I. Tang

School of Earth System Sciences

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Abstract

We have measured the neutron spectra emitted in the weak decay of Λ¹²C and Λ⁸⁹Y over the energy region above 10 MeV in the (π⁺, K⁺) reaction with better statistics and an improved signal-to-background ratio. The neutron yields in the nonmesonic weak decays were obtained from the spectra. By using the proton yield of Λ¹²C, the Γ_n/Γ_p ratio was estimated to be 0.51±0.15 (stat) from the neutron-to-proton yield ratio for the first time, which suggests the Γ _n/Γ_p ratio is significantly less than unity.

Original language	English
Article number	065201
Pages (from-to)	652011-652015
Number of pages	5
Journal	Physical Review C - Nuclear Physics
Volume	68
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.68.065201
State	Published - Dec 2003

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Kim, J. H., Bhang, H., Kim, M. J., Kim, Y. D., Park, H., Ajimura, S., Kishimoto, T., Minami, S., Mori, T., Sakaguchi, A., Shimizu, Y., Sumihama, M., Endo, T., Hashimoto, O., Miyoshi, T., Nishida, J., Saito, T., Sato, Y., Satoh, S., ... Tang, L. I. (2003). Neutron energy spectra from the nonmesonic weak decay of Λ ¹²C and Λ⁸⁹Y hypernuclei. Physical Review C - Nuclear Physics, 68(6), 652011-652015. Article 065201. https://doi.org/10.1103/PhysRevC.68.065201

@article{ff17db4dcda94a5782c4f27857273ac6,

title = "Neutron energy spectra from the nonmesonic weak decay of Λ 12C and Λ89Y hypernuclei",

abstract = "We have measured the neutron spectra emitted in the weak decay of Λ12C and Λ89Y over the energy region above 10 MeV in the (π+, K+) reaction with better statistics and an improved signal-to-background ratio. The neutron yields in the nonmesonic weak decays were obtained from the spectra. By using the proton yield of Λ12C, the Γn/Γp ratio was estimated to be 0.51±0.15 (stat) from the neutron-to-proton yield ratio for the first time, which suggests the Γ n/Γp ratio is significantly less than unity.",

author = "Kim, {J. H.} and H. Bhang and Kim, {M. J.} and Kim, {Y. D.} and H. Park and S. Ajimura and T. Kishimoto and S. Minami and T. Mori and A. Sakaguchi and Y. Shimizu and M. Sumihama and T. Endo and O. Hashimoto and T. Miyoshi and J. Nishida and T. Saito and Y. Sato and S. Satoh and T. Takahashi and H. Tamura and T. Fukuda and T. Nagae and H. Noumi and H. Outa and M. Sekimoto and H. Hotchi and K. Tanida and R. Sawafta and Tang, {L. I.}",

year = "2003",

month = dec,

doi = "10.1103/PhysRevC.68.065201",

language = "English",

volume = "68",

pages = "652011--652015",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "6",

}

Kim, JH, Bhang, H, Kim, MJ, Kim, YD, Park, H, Ajimura, S, Kishimoto, T, Minami, S, Mori, T, Sakaguchi, A, Shimizu, Y, Sumihama, M, Endo, T, Hashimoto, O, Miyoshi, T, Nishida, J, Saito, T, Sato, Y, Satoh, S, Takahashi, T, Tamura, H, Fukuda, T, Nagae, T, Noumi, H, Outa, H, Sekimoto, M, Hotchi, H, Tanida, K, Sawafta, R & Tang, LI 2003, 'Neutron energy spectra from the nonmesonic weak decay of Λ ¹²C and Λ⁸⁹Y hypernuclei', Physical Review C - Nuclear Physics, vol. 68, no. 6, 065201, pp. 652011-652015. https://doi.org/10.1103/PhysRevC.68.065201

TY - JOUR

T1 - Neutron energy spectra from the nonmesonic weak decay of Λ 12C and Λ89Y hypernuclei

AU - Kim, J. H.

AU - Bhang, H.

AU - Kim, M. J.

AU - Kim, Y. D.

AU - Park, H.

AU - Ajimura, S.

AU - Kishimoto, T.

AU - Minami, S.

AU - Mori, T.

AU - Sakaguchi, A.

AU - Shimizu, Y.

AU - Sumihama, M.

AU - Endo, T.

AU - Hashimoto, O.

AU - Miyoshi, T.

AU - Nishida, J.

AU - Saito, T.

AU - Sato, Y.

AU - Satoh, S.

AU - Takahashi, T.

AU - Tamura, H.

AU - Fukuda, T.

AU - Nagae, T.

AU - Noumi, H.

AU - Outa, H.

AU - Sekimoto, M.

AU - Hotchi, H.

AU - Tanida, K.

AU - Sawafta, R.

AU - Tang, L. I.

PY - 2003/12

Y1 - 2003/12

N2 - We have measured the neutron spectra emitted in the weak decay of Λ12C and Λ89Y over the energy region above 10 MeV in the (π+, K+) reaction with better statistics and an improved signal-to-background ratio. The neutron yields in the nonmesonic weak decays were obtained from the spectra. By using the proton yield of Λ12C, the Γn/Γp ratio was estimated to be 0.51±0.15 (stat) from the neutron-to-proton yield ratio for the first time, which suggests the Γ n/Γp ratio is significantly less than unity.

AB - We have measured the neutron spectra emitted in the weak decay of Λ12C and Λ89Y over the energy region above 10 MeV in the (π+, K+) reaction with better statistics and an improved signal-to-background ratio. The neutron yields in the nonmesonic weak decays were obtained from the spectra. By using the proton yield of Λ12C, the Γn/Γp ratio was estimated to be 0.51±0.15 (stat) from the neutron-to-proton yield ratio for the first time, which suggests the Γ n/Γp ratio is significantly less than unity.

UR - http://www.scopus.com/inward/record.url?scp=1342310143&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.68.065201

DO - 10.1103/PhysRevC.68.065201

M3 - Article

AN - SCOPUS:1342310143

SN - 0556-2813

VL - 68

SP - 652011

EP - 652015

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 6

M1 - 065201

ER -

Neutron energy spectra from the nonmesonic weak decay of Λ ¹²C and Λ⁸⁹Y hypernuclei

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