The three-body nonmesonic weak decay process of Λ 12C hypernucleus and its exclusive measurement at J-PARC (E18)

H. Bhang, Jung Keun Ahn, S. Ajimura, K. Aoki, S. Choi, T. Fukuda, O. Hashimoto, B. H. Kang, E. Kim, J. H. Kim, M. Kim, S. J. Kim, T. Maruta, T. Nagae, S. N. Nakamura, H. Noumi, S. Okada, H. Outa, H. Park, P. K. SahaA. Sakaguchi, Y. Sato, M. Sekimoto, T. Takahashi, H. Tamura, K. Tanida, A. Toyoda, K. Tshoo, H. J. Yim, C. J. Yoon

Research output: Contribution to journalArticle

Abstract

In spite of the recent crucial progresses in the studies of nonmesonic weak decay (NMWD) of Λ hypernuclei, its consistent understanding is yet to be achieved. In the experimental progresses, the long standing Γnp problem has finally been solved recently. And for the first time, two-nucleon induced NMWD channel has been identified experimentally and its decay width, 0.27±0.13, measured but only with a 2σ confidence level. On the other hand, the decay asymmetry remains to be understood yet and the accurate measurement of the decay width of each channel is much awaited for the consistent understanding of NMWD. In E18 of J-PARC, we are going to measure Γi of NMWD including Γ2N with 10 % statistical uncertainties. Main concerns in E18 experiment such as the handling of the high beam intensity, the neutron background contamination in the neutron coincidence yields and the control of the trigger rates with the beam intensity as high as 107π +/spill are discussed and it is shown that they can be handled properly.

Original languageEnglish
Article number022009
JournalJournal of Physics: Conference Series
Volume312
Issue numberSECTION 2
DOIs
Publication statusPublished - 2011 Nov 9
Externally publishedYes

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hypernuclei
decay
neutrons
confidence
contamination
actuators
asymmetry

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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The three-body nonmesonic weak decay process of Λ 12C hypernucleus and its exclusive measurement at J-PARC (E18). / Bhang, H.; Ahn, Jung Keun; Ajimura, S.; Aoki, K.; Choi, S.; Fukuda, T.; Hashimoto, O.; Kang, B. H.; Kim, E.; Kim, J. H.; Kim, M.; Kim, S. J.; Maruta, T.; Nagae, T.; Nakamura, S. N.; Noumi, H.; Okada, S.; Outa, H.; Park, H.; Saha, P. K.; Sakaguchi, A.; Sato, Y.; Sekimoto, M.; Takahashi, T.; Tamura, H.; Tanida, K.; Toyoda, A.; Tshoo, K.; Yim, H. J.; Yoon, C. J.

In: Journal of Physics: Conference Series, Vol. 312, No. SECTION 2, 022009, 09.11.2011.

Research output: Contribution to journalArticle

Bhang, H, Ahn, JK, Ajimura, S, Aoki, K, Choi, S, Fukuda, T, Hashimoto, O, Kang, BH, Kim, E, Kim, JH, Kim, M, Kim, SJ, Maruta, T, Nagae, T, Nakamura, SN, Noumi, H, Okada, S, Outa, H, Park, H, Saha, PK, Sakaguchi, A, Sato, Y, Sekimoto, M, Takahashi, T, Tamura, H, Tanida, K, Toyoda, A, Tshoo, K, Yim, HJ & Yoon, CJ 2011, 'The three-body nonmesonic weak decay process of Λ 12C hypernucleus and its exclusive measurement at J-PARC (E18)', Journal of Physics: Conference Series, vol. 312, no. SECTION 2, 022009. https://doi.org/10.1088/1742-6596/312/2/022009
Bhang, H. ; Ahn, Jung Keun ; Ajimura, S. ; Aoki, K. ; Choi, S. ; Fukuda, T. ; Hashimoto, O. ; Kang, B. H. ; Kim, E. ; Kim, J. H. ; Kim, M. ; Kim, S. J. ; Maruta, T. ; Nagae, T. ; Nakamura, S. N. ; Noumi, H. ; Okada, S. ; Outa, H. ; Park, H. ; Saha, P. K. ; Sakaguchi, A. ; Sato, Y. ; Sekimoto, M. ; Takahashi, T. ; Tamura, H. ; Tanida, K. ; Toyoda, A. ; Tshoo, K. ; Yim, H. J. ; Yoon, C. J. / The three-body nonmesonic weak decay process of Λ 12C hypernucleus and its exclusive measurement at J-PARC (E18). In: Journal of Physics: Conference Series. 2011 ; Vol. 312, No. SECTION 2.
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abstract = "In spite of the recent crucial progresses in the studies of nonmesonic weak decay (NMWD) of Λ hypernuclei, its consistent understanding is yet to be achieved. In the experimental progresses, the long standing Γn/Γp problem has finally been solved recently. And for the first time, two-nucleon induced NMWD channel has been identified experimentally and its decay width, 0.27±0.13, measured but only with a 2σ confidence level. On the other hand, the decay asymmetry remains to be understood yet and the accurate measurement of the decay width of each channel is much awaited for the consistent understanding of NMWD. In E18 of J-PARC, we are going to measure Γi of NMWD including Γ2N with 10 {\%} statistical uncertainties. Main concerns in E18 experiment such as the handling of the high beam intensity, the neutron background contamination in the neutron coincidence yields and the control of the trigger rates with the beam intensity as high as 107π +/spill are discussed and it is shown that they can be handled properly.",
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AU - Bhang, H.

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AU - Aoki, K.

AU - Choi, S.

AU - Fukuda, T.

AU - Hashimoto, O.

AU - Kang, B. H.

AU - Kim, E.

AU - Kim, J. H.

AU - Kim, M.

AU - Kim, S. J.

AU - Maruta, T.

AU - Nagae, T.

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AU - Noumi, H.

AU - Okada, S.

AU - Outa, H.

AU - Park, H.

AU - Saha, P. K.

AU - Sakaguchi, A.

AU - Sato, Y.

AU - Sekimoto, M.

AU - Takahashi, T.

AU - Tamura, H.

AU - Tanida, K.

AU - Toyoda, A.

AU - Tshoo, K.

AU - Yim, H. J.

AU - Yoon, C. J.

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