Coincidence exclusive measurement of the nonmesonic weak decay of Λ12C

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

doi:10.1063/1.2220322

Coincidence exclusive measurement of the nonmesonic weak decay of _Λ¹²C

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

School of Earth System Sciences

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

We have measured the angular correlation of the pair nucleons np and nn emitted from the nonmesonic weak decay (NMWD) of _Λ ¹²C produced via the (π⁺,K⁺) reaction in coincidence measurement. The Λp → np and Λn → nn modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers N_nn and N_np, the ratio Γ_n/Γ_p of the partial decay widths Γ_n(Λn → nn) and Γ_p(Λp → np) of _Λ¹²C was extracted to be 0.51 ± 0.13(stat)±0.04(syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained Γ_n/ Γ_p ratio of _Λ¹²C (p-shell) is close to that of _Λ⁵He (s-shell). The results are consistent with those of recent theoretical calculations.

Original language	English
Title of host publication	PARTICLES AND NUCLEI
Subtitle of host publication	Seventeenth Internatinal Conference on Particles and Nuclei
Pages	528-530
Number of pages	3
DOIs	https://doi.org/10.1063/1.2220322
State	Published - 2006
Event	PARTICLES AND NUCLEI: Seventeenth Internatinal Conference on Particles and Nuclei - Santa Fe, NM, United States Duration: 23 Oct 2005 → 30 Oct 2005

Publication series

Name	AIP Conference Proceedings
Volume	842
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	PARTICLES AND NUCLEI: Seventeenth Internatinal Conference on Particles and Nuclei
Country/Territory	United States
City	Santa Fe, NM
Period	23/10/05 → 30/10/05

Keywords

Nonmesonic weak decay
Γ/Γ ratio

Access to Document

10.1063/1.2220322

Cite this

Kim, M. J., Ajimura, S., Aoki, K., Banu, A., Bhang, H., Fukuda, T., Hashimoto, O., Hwang, J. I., Kameoka, S., Kang, B. H., Kim, E. H., Kim, J. H., Maruta, T., Miura, Y., Miyake, Y., Nagae, T., Nakamura, M., Nakamura, S. N., Noumi, H., ... Yim, H. J. (2006). Coincidence exclusive measurement of the nonmesonic weak decay of _Λ¹²C. In PARTICLES AND NUCLEI: Seventeenth Internatinal Conference on Particles and Nuclei (pp. 528-530). (AIP Conference Proceedings; Vol. 842). https://doi.org/10.1063/1.2220322

@inproceedings{cef5b4ef2b1c4ac1b77abca7c68c7548,

title = "Coincidence exclusive measurement of the nonmesonic weak decay of Λ12C",

abstract = "We have measured the angular correlation of the pair nucleons np and nn emitted from the nonmesonic weak decay (NMWD) of Λ 12C produced via the (π+,K+) reaction in coincidence measurement. The Λp → np and Λn → nn modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers Nnn and Nnp, the ratio Γn/Γp of the partial decay widths Γn(Λn → nn) and Γp(Λp → np) of Λ12C was extracted to be 0.51 ± 0.13(stat)±0.04(syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained Γn/ Γp ratio of Λ12C (p-shell) is close to that of Λ5He (s-shell). The results are consistent with those of recent theoretical calculations.",

keywords = "Nonmesonic weak decay, Γ/Γ ratio",

author = "Kim, {M. J.} and S. Ajimura and K. Aoki and A. Banu and H. Bhang 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 T. Maruta and Y. Miura and Y. Miyake and T. Nagae and M. Nakamura and Nakamura, {S. N.} and H. Noumi and S. Okada and Y. Okayasu and H. Outa and H. Park and Saha, {P. K.} and Y. Sato and M. Sekimoto and S. Shin and T. Takahashi and H. Tamura and K. Tanida and A. Toyota and K. Tsukada and T. Watanabe and Yim, {H. J.}",

year = "2006",

doi = "10.1063/1.2220322",

language = "English",

isbn = "0735403384",

series = "AIP Conference Proceedings",

pages = "528--530",

booktitle = "PARTICLES AND NUCLEI",

note = "PARTICLES AND NUCLEI: Seventeenth Internatinal Conference on Particles and Nuclei ; Conference date: 23-10-2005 Through 30-10-2005",

}

Kim, MJ, Ajimura, S, Aoki, K, Banu, A, Bhang, H, Fukuda, T, Hashimoto, O, Hwang, JI, Kameoka, S, Kang, BH, Kim, EH, Kim, JH, Maruta, T, Miura, Y, Miyake, Y, Nagae, T, Nakamura, M, Nakamura, SN, Noumi, H, Okada, S, Okayasu, Y, Outa, H, Park, H, Saha, PK, Sato, Y, Sekimoto, M, Shin, S, Takahashi, T, Tamura, H, Tanida, K, Toyota, A, Tsukada, K, Watanabe, T & Yim, HJ 2006, Coincidence exclusive measurement of the nonmesonic weak decay of _Λ¹²C. in PARTICLES AND NUCLEI: Seventeenth Internatinal Conference on Particles and Nuclei. AIP Conference Proceedings, vol. 842, pp. 528-530, PARTICLES AND NUCLEI: Seventeenth Internatinal Conference on Particles and Nuclei, Santa Fe, NM, United States, 23/10/05. https://doi.org/10.1063/1.2220322

TY - GEN

T1 - Coincidence exclusive measurement of the nonmesonic weak decay of Λ12C

AU - Kim, M. J.

AU - Ajimura, S.

AU - Aoki, K.

AU - Banu, A.

AU - Bhang, H.

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 - Maruta, T.

AU - Miura, Y.

AU - Miyake, Y.

AU - Nagae, T.

AU - Nakamura, M.

AU - Nakamura, S. N.

AU - Noumi, H.

AU - Okada, S.

AU - Okayasu, Y.

AU - Outa, H.

AU - Park, H.

AU - Saha, P. K.

AU - Sato, Y.

AU - Sekimoto, M.

AU - Shin, S.

AU - Takahashi, T.

AU - Tamura, H.

AU - Tanida, K.

AU - Toyota, A.

AU - Tsukada, K.

AU - Watanabe, T.

AU - Yim, H. J.

PY - 2006

Y1 - 2006

N2 - We have measured the angular correlation of the pair nucleons np and nn emitted from the nonmesonic weak decay (NMWD) of Λ 12C produced via the (π+,K+) reaction in coincidence measurement. The Λp → np and Λn → nn modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers Nnn and Nnp, the ratio Γn/Γp of the partial decay widths Γn(Λn → nn) and Γp(Λp → np) of Λ12C was extracted to be 0.51 ± 0.13(stat)±0.04(syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained Γn/ Γp ratio of Λ12C (p-shell) is close to that of Λ5He (s-shell). The results are consistent with those of recent theoretical calculations.

AB - We have measured the angular correlation of the pair nucleons np and nn emitted from the nonmesonic weak decay (NMWD) of Λ 12C produced via the (π+,K+) reaction in coincidence measurement. The Λp → np and Λn → nn modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers Nnn and Nnp, the ratio Γn/Γp of the partial decay widths Γn(Λn → nn) and Γp(Λp → np) of Λ12C was extracted to be 0.51 ± 0.13(stat)±0.04(syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained Γn/ Γp ratio of Λ12C (p-shell) is close to that of Λ5He (s-shell). The results are consistent with those of recent theoretical calculations.

KW - Nonmesonic weak decay

KW - Γ/Γ ratio

UR - http://www.scopus.com/inward/record.url?scp=33846389170&partnerID=8YFLogxK

U2 - 10.1063/1.2220322

DO - 10.1063/1.2220322

M3 - Conference contribution

AN - SCOPUS:33846389170

SN - 0735403384

SN - 9780735403383

T3 - AIP Conference Proceedings

SP - 528

EP - 530

BT - PARTICLES AND NUCLEI

T2 - PARTICLES AND NUCLEI: Seventeenth Internatinal Conference on Particles and Nuclei

Y2 - 23 October 2005 through 30 October 2005

ER -