Non-mesonic weak decays of Λ5He and Λ 12C hypernuclei using the (π+, K+) reactions

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; S. Shin; T. Takahashi; H. Tamura; K. Tanida; A. Toyoda; K. Tsukada; T. Watanabe; H. J. Yim

doi:10.1063/1.2932278

Non-mesonic weak decays of Λ⁵He and Λ ¹²C hypernuclei using the (π⁺, K⁺) reactions

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

SCI - Physics

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

Abstract

We have measured for the first time yields of both neutron-proton and neutron-neutron pairs emitted from the non-mesonic weak decay of the _Λ⁵He and _Λ¹²C hypernuclei, produced via the (π⁺,K⁺) reaction. From the yields of both the back-to-back np-pair events and nn-pair events, we have directly determined the ratio of the neutron- and proton-induced decay widths, Γ_n(Λn → nn)Γ_p(Λp → np). Meanwhile, we have also determined the quenching of the observed numbers of single nucleons and coincident nucleon pairs compared with theoretical calculations. Our results suggest that contributions from the two-nucleon-induced three-body process ΛNN → NNN are significant.

Original language	English
Title of host publication	NEW FACET OF THREE NUCLEON FORCE - 50 YEARS OF FUJITA MIYAZAWA THREE NUCLEON FORCE (FM50) - Proceedings of the International Symposium
Pages	135-139
Number of pages	5
DOIs	https://doi.org/10.1063/1.2932278
Publication status	Published - 2008
Event	International Symposium on New Facets of the Three Nucleon Force - 50 Years of the Fujita-Miyazawa Three Nucleon Force, FM50 - Tokyo, Japan Duration: 2007 Oct 29 → 2007 Oct 31

Publication series

Name	AIP Conference Proceedings
Volume	1011
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	International Symposium on New Facets of the Three Nucleon Force - 50 Years of the Fujita-Miyazawa Three Nucleon Force, FM50
Country/Territory	Japan
City	Tokyo
Period	07/10/29 → 07/10/31

Keywords

Non-mesonic weak decay
Nucleon energy spectrum
Λ hypernuclei

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1063/1.2932278

Cite this

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. (2008). Non-mesonic weak decays of Λ⁵He and Λ ¹²C hypernuclei using the (π⁺, K⁺) reactions. In NEW FACET OF THREE NUCLEON FORCE - 50 YEARS OF FUJITA MIYAZAWA THREE NUCLEON FORCE (FM50) - Proceedings of the International Symposium (pp. 135-139). (AIP Conference Proceedings; Vol. 1011). https://doi.org/10.1063/1.2932278

Non-mesonic weak decays of Λ⁵He and Λ ¹²C hypernuclei using the (π⁺, K⁺) reactions. / Okada, S.; Ajimura, S.; Aoki, K. et al.
NEW FACET OF THREE NUCLEON FORCE - 50 YEARS OF FUJITA MIYAZAWA THREE NUCLEON FORCE (FM50) - Proceedings of the International Symposium. 2008. p. 135-139 (AIP Conference Proceedings; Vol. 1011).

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

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, Shin, S, Takahashi, T, Tamura, H, Tanida, K, Toyoda, A, Tsukada, K, Watanabe, T & Yim, HJ 2008, Non-mesonic weak decays of Λ⁵He and Λ ¹²C hypernuclei using the (π⁺, K⁺) reactions. in NEW FACET OF THREE NUCLEON FORCE - 50 YEARS OF FUJITA MIYAZAWA THREE NUCLEON FORCE (FM50) - Proceedings of the International Symposium. AIP Conference Proceedings, vol. 1011, pp. 135-139, International Symposium on New Facets of the Three Nucleon Force - 50 Years of the Fujita-Miyazawa Three Nucleon Force, FM50, Tokyo, Japan, 07/10/29. https://doi.org/10.1063/1.2932278

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title = "Non-mesonic weak decays of Λ5He and Λ 12C hypernuclei using the (π+, K+) reactions",

abstract = "We have measured for the first time yields of both neutron-proton and neutron-neutron pairs emitted from the non-mesonic weak decay of the Λ5He and Λ12C hypernuclei, produced via the (π+,K+) reaction. From the yields of both the back-to-back np-pair events and nn-pair events, we have directly determined the ratio of the neutron- and proton-induced decay widths, Γn(Λn → nn)Γp(Λp → np). Meanwhile, we have also determined the quenching of the observed numbers of single nucleons and coincident nucleon pairs compared with theoretical calculations. Our results suggest that contributions from the two-nucleon-induced three-body process ΛNN → NNN are significant.",

keywords = "Non-mesonic weak decay, Nucleon energy spectrum, Λ hypernuclei",

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 S. Shin and T. Takahashi and H. Tamura and K. Tanida and A. Toyoda and K. Tsukada and T. Watanabe and Yim, {H. J.}",

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TY - GEN

T1 - Non-mesonic weak decays of Λ5He and Λ 12C hypernuclei using the (π+, K+) reactions

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 - Shin, S.

AU - Takahashi, T.

AU - Tamura, H.

AU - Tanida, K.

AU - Toyoda, A.

AU - Tsukada, K.

AU - Watanabe, T.

AU - Yim, H. J.

PY - 2008

Y1 - 2008

N2 - We have measured for the first time yields of both neutron-proton and neutron-neutron pairs emitted from the non-mesonic weak decay of the Λ5He and Λ12C hypernuclei, produced via the (π+,K+) reaction. From the yields of both the back-to-back np-pair events and nn-pair events, we have directly determined the ratio of the neutron- and proton-induced decay widths, Γn(Λn → nn)Γp(Λp → np). Meanwhile, we have also determined the quenching of the observed numbers of single nucleons and coincident nucleon pairs compared with theoretical calculations. Our results suggest that contributions from the two-nucleon-induced three-body process ΛNN → NNN are significant.

AB - We have measured for the first time yields of both neutron-proton and neutron-neutron pairs emitted from the non-mesonic weak decay of the Λ5He and Λ12C hypernuclei, produced via the (π+,K+) reaction. From the yields of both the back-to-back np-pair events and nn-pair events, we have directly determined the ratio of the neutron- and proton-induced decay widths, Γn(Λn → nn)Γp(Λp → np). Meanwhile, we have also determined the quenching of the observed numbers of single nucleons and coincident nucleon pairs compared with theoretical calculations. Our results suggest that contributions from the two-nucleon-induced three-body process ΛNN → NNN are significant.

KW - Non-mesonic weak decay

KW - Nucleon energy spectrum

KW - Λ hypernuclei

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EP - 139

BT - NEW FACET OF THREE NUCLEON FORCE - 50 YEARS OF FUJITA MIYAZAWA THREE NUCLEON FORCE (FM50) - Proceedings of the International Symposium

T2 - International Symposium on New Facets of the Three Nucleon Force - 50 Years of the Fujita-Miyazawa Three Nucleon Force, FM50

Y2 - 29 October 2007 through 31 October 2007

ER -