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.
| Original language | English |
|---|---|
| Article number | 022009 |
| Journal | Journal of Physics: Conference Series |
| Volume | 312 |
| Issue number | SECTION 2 |
| DOIs | |
| Publication status | Published - 2011 Nov 9 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
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 journal › Article
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TY - JOUR
T1 - The three-body nonmesonic weak decay process of Λ 12C hypernucleus and its exclusive measurement at J-PARC (E18)
AU - Bhang, H.
AU - Ahn, Jung Keun
AU - Ajimura, S.
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.
AU - Nakamura, S. N.
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.
PY - 2011/11/9
Y1 - 2011/11/9
N2 - 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.
AB - 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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U2 - 10.1088/1742-6596/312/2/022009
DO - 10.1088/1742-6596/312/2/022009
M3 - Article
AN - SCOPUS:80455140554
VL - 312
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - SECTION 2
M1 - 022009
ER -