Nucleon-nucleon coincidence measurement in the non-mesonic weak decay of 5ΛHe and 12ΛC hypernuclei

S. Okada; S. Ajimura; K. Aoki; A. Banu; H. C. Bhang; T. Fukuda; O. Hashimoto; J. I. Hwang; S. Kameoka; B. H. Kang; E. H. Kim; J. H. Kim; M. J. Kim; T. Maruta; Y. Miura; Y. Miyake; T. Nagae; M. Nakamura; S. N. Nakamura; H. Noumi; Y. Okayasu; H. Outa; H. Park; P. K. Saha; Y. Sato; M. Sekimoto; T. Takahashi; H. Tamura; K. Tanida; A. Toyoda; K. Tsukada; T. Watanabe; H. J. Yim

doi:10.1016/j.nuclphysa.2005.02.035

Nucleon-nucleon coincidence measurement in the non-mesonic weak decay of ⁵_ΛHe and ¹²_ΛC hypernuclei

S. Okada
, S. Ajimura
, K. Aoki
, A. Banu
, H. C. Bhang
, T. Fukuda
, O. Hashimoto
, J. I. Hwang
, S. Kameoka
, B. H. Kang
, E. H. Kim
, J. H. Kim
, M. J. Kim
, T. Maruta
, Y. Miura
, Y. Miyake
, T. Nagae
, M. Nakamura
, S. N. Nakamura
, H. Noumi

Y. Okayasu, H. Outa, H. Park, P. K. Saha, Y. Sato, M. Sekimoto, T. Takahashi, H. Tamura, K. Tanida, A. Toyoda, K. Tsukada, T. Watanabe, H. J. Yim

School of Earth System Sciences

Institute of Science Tokyo
RIKEN
The University of Osaka
High Energy Accelerator Research Organization, Tsukuba
GSI Helmholtz Centre for Heavy Ion Research
Seoul National University
Osaka Electro-Communication University
Tohoku University
The University of Tokyo
Korea Research Institute of Standards and Science
Japan Atomic Energy Agency

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

5 Scopus citations

Abstract

We have measured both yields of neutron-proton and neutron-neutron pairs emitted from the non-mesonic weak decay process of _Λ ⁵He and _Λ¹²C hypernuclei produced via the (π⁺, K⁺) reaction for the first time. We observed clean back-to-back correlation of the np- and nn-pairs in the coincidence spectra for both hypernuclei. The ratio of those back-to-back pair yields, N_nn/N_np, must be close to the ratio of neutron- and proton-induced decay widths of the decay, Γ_n (Λn → nn)/Γ_p(Λp → np). The obtained ratios for each hypernuclei support recent calculations based on short-range interactions.

Original language	English
Pages (from-to)	196-199
Number of pages	4
Journal	Nuclear Physics A
Volume	752
Issue number	1-4 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.nuclphysa.2005.02.035
State	Published - 18 Apr 2005

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Okada, S., Ajimura, S., Aoki, K., Banu, A., Bhang, H. C., Fukuda, T., Hashimoto, O., Hwang, J. I., Kameoka, S., Kang, B. H., Kim, E. H., Kim, J. H., Kim, M. J., Maruta, T., Miura, Y., Miyake, Y., Nagae, T., Nakamura, M., Nakamura, S. N., ... Yim, H. J. (2005). Nucleon-nucleon coincidence measurement in the non-mesonic weak decay of ⁵_ΛHe and ¹²_ΛC hypernuclei. Nuclear Physics A, 752(1-4 SPEC. ISS.), 196-199. https://doi.org/10.1016/j.nuclphysa.2005.02.035

@article{564710ffeb6747e4a7bb579039eea0ab,

title = "Nucleon-nucleon coincidence measurement in the non-mesonic weak decay of 5ΛHe and 12ΛC hypernuclei",

abstract = "We have measured both yields of neutron-proton and neutron-neutron pairs emitted from the non-mesonic weak decay process of Λ 5He and Λ12C hypernuclei produced via the (π+, K+) reaction for the first time. We observed clean back-to-back correlation of the np- and nn-pairs in the coincidence spectra for both hypernuclei. The ratio of those back-to-back pair yields, Nnn/Nnp, must be close to the ratio of neutron- and proton-induced decay widths of the decay, Γn (Λn → nn)/Γp(Λp → np). The obtained ratios for each hypernuclei support recent calculations based on short-range interactions.",

author = "S. Okada and S. Ajimura and K. Aoki and A. Banu and Bhang, \{H. C.\} and T. Fukuda and O. Hashimoto and Hwang, \{J. I.\} and S. Kameoka and Kang, \{B. H.\} and Kim, \{E. H.\} and Kim, \{J. H.\} and Kim, \{M. J.\} and T. Maruta and Y. Miura and Y. Miyake and T. Nagae and M. Nakamura and Nakamura, \{S. N.\} and H. Noumi and Y. Okayasu and H. Outa and H. Park and Saha, \{P. K.\} and Y. Sato and M. Sekimoto and T. Takahashi and H. Tamura and K. Tanida and A. Toyoda and K. Tsukada and T. Watanabe and Yim, \{H. J.\}",

year = "2005",

month = apr,

day = "18",

doi = "10.1016/j.nuclphysa.2005.02.035",

language = "English",

volume = "752",

pages = "196--199",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier B.V.",

number = "1-4 SPEC. ISS.",

}

Okada, S, Ajimura, S, Aoki, K, Banu, A, Bhang, HC, Fukuda, T, Hashimoto, O, Hwang, JI, Kameoka, S, Kang, BH, Kim, EH, Kim, JH, Kim, MJ, Maruta, T, Miura, Y, Miyake, Y, Nagae, T, Nakamura, M, Nakamura, SN, Noumi, H, Okayasu, Y, Outa, H, Park, H, Saha, PK, Sato, Y, Sekimoto, M, Takahashi, T, Tamura, H, Tanida, K, Toyoda, A, Tsukada, K, Watanabe, T & Yim, HJ 2005, 'Nucleon-nucleon coincidence measurement in the non-mesonic weak decay of ⁵_ΛHe and ¹²_ΛC hypernuclei', Nuclear Physics A, vol. 752, no. 1-4 SPEC. ISS., pp. 196-199. https://doi.org/10.1016/j.nuclphysa.2005.02.035

TY - JOUR

T1 - Nucleon-nucleon coincidence measurement in the non-mesonic weak decay of 5ΛHe and 12ΛC hypernuclei

AU - Okada, S.

AU - Ajimura, S.

AU - Aoki, K.

AU - Banu, A.

AU - Bhang, H. C.

AU - Fukuda, T.

AU - Hashimoto, O.

AU - Hwang, J. I.

AU - Kameoka, S.

AU - Kang, B. H.

AU - Kim, E. H.

AU - Kim, J. H.

AU - Kim, M. J.

AU - Maruta, T.

AU - Miura, Y.

AU - Miyake, Y.

AU - Nagae, T.

AU - Nakamura, M.

AU - Nakamura, S. N.

AU - Noumi, H.

AU - Okayasu, Y.

AU - Outa, H.

AU - Park, H.

AU - Saha, P. K.

AU - Sato, Y.

AU - Sekimoto, M.

AU - Takahashi, T.

AU - Tamura, H.

AU - Tanida, K.

AU - Toyoda, A.

AU - Tsukada, K.

AU - Watanabe, T.

AU - Yim, H. J.

PY - 2005/4/18

Y1 - 2005/4/18

N2 - We have measured both yields of neutron-proton and neutron-neutron pairs emitted from the non-mesonic weak decay process of Λ 5He and Λ12C hypernuclei produced via the (π+, K+) reaction for the first time. We observed clean back-to-back correlation of the np- and nn-pairs in the coincidence spectra for both hypernuclei. The ratio of those back-to-back pair yields, Nnn/Nnp, must be close to the ratio of neutron- and proton-induced decay widths of the decay, Γn (Λn → nn)/Γp(Λp → np). The obtained ratios for each hypernuclei support recent calculations based on short-range interactions.

AB - We have measured both yields of neutron-proton and neutron-neutron pairs emitted from the non-mesonic weak decay process of Λ 5He and Λ12C hypernuclei produced via the (π+, K+) reaction for the first time. We observed clean back-to-back correlation of the np- and nn-pairs in the coincidence spectra for both hypernuclei. The ratio of those back-to-back pair yields, Nnn/Nnp, must be close to the ratio of neutron- and proton-induced decay widths of the decay, Γn (Λn → nn)/Γp(Λp → np). The obtained ratios for each hypernuclei support recent calculations based on short-range interactions.

UR - https://www.scopus.com/pages/publications/15844423005

U2 - 10.1016/j.nuclphysa.2005.02.035

DO - 10.1016/j.nuclphysa.2005.02.035

M3 - Article

AN - SCOPUS:15844423005

SN - 0375-9474

VL - 752

SP - 196

EP - 199

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 1-4 SPEC. ISS.

ER -

Nucleon-nucleon coincidence measurement in the non-mesonic weak decay of ⁵_ΛHe and ¹²_ΛC hypernuclei

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