Study of invisible nucleon decay, n→ννν, and a forbidden nuclear transition in the Kamiokande detector

Y. Suzuki; Y. Fukuda; K. S. Hirata; K. Inoue; T. Ishida; T. Kajita; K. Kihara; M. Nakahata; K. Nakamura; A. Sakai; N. Sato; Y. Totsuka; M. Mori; Y. Oyama; A. Suzuki; K. Takahashi; M. Yamada; M. Koshiba; K. Nishijima; T. Kajumura; T. Suda; A. T. Suzuki; K. Miyano; H. Miyata; H. Takei; E. Kodera; Y. Nagashima; M. Takita; H. Yokoyama; K. Kaneyuki; Y. Takeuchi; T. Tanimori; H. Ejiri

doi:10.1016/0370-2693(93)90582-3

Study of invisible nucleon decay, n→ννν, and a forbidden nuclear transition in the Kamiokande detector

Y. Suzuki, Y. Fukuda, K. S. Hirata, K. Inoue, T. Ishida, T. Kajita, K. Kihara, M. Nakahata, K. Nakamura, A. Sakai, N. Sato, Y. Totsuka, M. Mori, Y. Oyama, A. Suzuki, K. Takahashi, M. Yamada, M. Koshiba, K. Nishijima, T. KajumuraT. Suda, A. T. Suzuki, K. Miyano, H. Miyata, H. Takei, E. Kodera, Y. Nagashima, M. Takita, H. Yokoyama, K. Kaneyuki, Y. Takeuchi, T. Tanimori, H. Ejiri

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Abstract

A search was made for anomalous γ-rays in the energy range 19 and 50 MeV in the large underground water Cherenkov detector Kamiokande. We found no significant excess above the known backgrounds. The result was used to set a limit on invisible nucleon decay through n→ν_μν_μν_μ, n→ν_eν_eν_e and n→ν_τν_τν_τ. A lower limit on the partial life time τ_B is given by τ_B/Br(γ)=1.8×10³¹ yr(90% CL), where Br(γ)=Γ_γ/Γ_tot is the branching fraction of the γ-decay to the particle emission of the deexcitation of ¹⁵O^*. The life time limit becomes τ_B=4.9×10²⁶ yr(90% CL) for a conservative estimate of Br(γ)=2.7×10^-5 assuming a nuclear single particle model. The result was also used for studying forbidden transitions in the ¹⁶O nucleus. The limit for the relative strength of the forbidden transition to the normal transition is <2.3×10^-57 (90% CL).

Original language	English
Pages (from-to)	357-361
Number of pages	5
Journal	Physics Letters B
Volume	311
Issue number	1-4
DOIs	https://doi.org/10.1016/0370-2693(93)90582-3
Publication status	Published - 1993 Jul 29
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/0370-2693(93)90582-3

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Suzuki, Y., Fukuda, Y., Hirata, K. S., Inoue, K., Ishida, T., Kajita, T., Kihara, K., Nakahata, M., Nakamura, K., Sakai, A., Sato, N., Totsuka, Y., Mori, M., Oyama, Y., Suzuki, A., Takahashi, K., Yamada, M., Koshiba, M., Nishijima, K., ... Ejiri, H. (1993). Study of invisible nucleon decay, n→ννν, and a forbidden nuclear transition in the Kamiokande detector. Physics Letters B, 311(1-4), 357-361. https://doi.org/10.1016/0370-2693(93)90582-3

Suzuki, Y, Fukuda, Y, Hirata, KS, Inoue, K, Ishida, T, Kajita, T, Kihara, K, Nakahata, M, Nakamura, K, Sakai, A, Sato, N, Totsuka, Y, Mori, M, Oyama, Y, Suzuki, A, Takahashi, K, Yamada, M, Koshiba, M, Nishijima, K, Kajumura, T, Suda, T, Suzuki, AT, Miyano, K, Miyata, H, Takei, H, Kodera, E, Nagashima, Y, Takita, M, Yokoyama, H, Kaneyuki, K, Takeuchi, Y, Tanimori, T & Ejiri, H 1993, 'Study of invisible nucleon decay, n→ννν, and a forbidden nuclear transition in the Kamiokande detector', Physics Letters B, vol. 311, no. 1-4, pp. 357-361. https://doi.org/10.1016/0370-2693(93)90582-3

@article{212545bea34e49abbd25e53ddf69c7f7,

title = "Study of invisible nucleon decay, n→ννν, and a forbidden nuclear transition in the Kamiokande detector",

abstract = "A search was made for anomalous γ-rays in the energy range 19 and 50 MeV in the large underground water Cherenkov detector Kamiokande. We found no significant excess above the known backgrounds. The result was used to set a limit on invisible nucleon decay through n→νμνμνμ, n→νeνeνe and n→ντντντ. A lower limit on the partial life time τB is given by τB/Br(γ)=1.8×1031 yr(90% CL), where Br(γ)=Γγ/Γtot is the branching fraction of the γ-decay to the particle emission of the deexcitation of 15O*. The life time limit becomes τB=4.9×1026 yr(90% CL) for a conservative estimate of Br(γ)=2.7×10-5 assuming a nuclear single particle model. The result was also used for studying forbidden transitions in the 16O nucleus. The limit for the relative strength of the forbidden transition to the normal transition is <2.3×10-57 (90% CL).",

author = "Y. Suzuki and Y. Fukuda and Hirata, {K. S.} and K. Inoue and T. Ishida and T. Kajita and K. Kihara and M. Nakahata and K. Nakamura and A. Sakai and N. Sato and Y. Totsuka and M. Mori and Y. Oyama and A. Suzuki and K. Takahashi and M. Yamada and M. Koshiba and K. Nishijima and T. Kajumura and T. Suda and Suzuki, {A. T.} and K. Miyano and H. Miyata and H. Takei and E. Kodera and Y. Nagashima and M. Takita and H. Yokoyama and K. Kaneyuki and Y. Takeuchi and T. Tanimori and H. Ejiri",

note = "Funding Information: We gratefully acknowledge the cooperation of the Kamioka Mining and Smelting Company. This work was supported partly by the Japanese Ministry of Education, Science and Culture, and by the University of Pennsylvania Research Fund. Part of the analysis was carried out on the FACOM M780 and M380 computers at the computer facility of the Institute for Nuclear Study, University of Tokyo.",

year = "1993",

month = jul,

day = "29",

doi = "10.1016/0370-2693(93)90582-3",

language = "English",

volume = "311",

pages = "357--361",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

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TY - JOUR

T1 - Study of invisible nucleon decay, n→ννν, and a forbidden nuclear transition in the Kamiokande detector

AU - Suzuki, Y.

AU - Fukuda, Y.

AU - Hirata, K. S.

AU - Inoue, K.

AU - Ishida, T.

AU - Kajita, T.

AU - Kihara, K.

AU - Nakahata, M.

AU - Nakamura, K.

AU - Sakai, A.

AU - Sato, N.

AU - Totsuka, Y.

AU - Mori, M.

AU - Oyama, Y.

AU - Suzuki, A.

AU - Takahashi, K.

AU - Yamada, M.

AU - Koshiba, M.

AU - Nishijima, K.

AU - Kajumura, T.

AU - Suda, T.

AU - Suzuki, A. T.

AU - Miyano, K.

AU - Miyata, H.

AU - Takei, H.

AU - Kodera, E.

AU - Nagashima, Y.

AU - Takita, M.

AU - Yokoyama, H.

AU - Kaneyuki, K.

AU - Takeuchi, Y.

AU - Tanimori, T.

AU - Ejiri, H.

N1 - Funding Information: We gratefully acknowledge the cooperation of the Kamioka Mining and Smelting Company. This work was supported partly by the Japanese Ministry of Education, Science and Culture, and by the University of Pennsylvania Research Fund. Part of the analysis was carried out on the FACOM M780 and M380 computers at the computer facility of the Institute for Nuclear Study, University of Tokyo.

PY - 1993/7/29

Y1 - 1993/7/29

N2 - A search was made for anomalous γ-rays in the energy range 19 and 50 MeV in the large underground water Cherenkov detector Kamiokande. We found no significant excess above the known backgrounds. The result was used to set a limit on invisible nucleon decay through n→νμνμνμ, n→νeνeνe and n→ντντντ. A lower limit on the partial life time τB is given by τB/Br(γ)=1.8×1031 yr(90% CL), where Br(γ)=Γγ/Γtot is the branching fraction of the γ-decay to the particle emission of the deexcitation of 15O*. The life time limit becomes τB=4.9×1026 yr(90% CL) for a conservative estimate of Br(γ)=2.7×10-5 assuming a nuclear single particle model. The result was also used for studying forbidden transitions in the 16O nucleus. The limit for the relative strength of the forbidden transition to the normal transition is <2.3×10-57 (90% CL).

AB - A search was made for anomalous γ-rays in the energy range 19 and 50 MeV in the large underground water Cherenkov detector Kamiokande. We found no significant excess above the known backgrounds. The result was used to set a limit on invisible nucleon decay through n→νμνμνμ, n→νeνeνe and n→ντντντ. A lower limit on the partial life time τB is given by τB/Br(γ)=1.8×1031 yr(90% CL), where Br(γ)=Γγ/Γtot is the branching fraction of the γ-decay to the particle emission of the deexcitation of 15O*. The life time limit becomes τB=4.9×1026 yr(90% CL) for a conservative estimate of Br(γ)=2.7×10-5 assuming a nuclear single particle model. The result was also used for studying forbidden transitions in the 16O nucleus. The limit for the relative strength of the forbidden transition to the normal transition is <2.3×10-57 (90% CL).

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U2 - 10.1016/0370-2693(93)90582-3

DO - 10.1016/0370-2693(93)90582-3

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AN - SCOPUS:0007403863

SN - 0370-2693

VL - 311

SP - 357

EP - 361

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-4

ER -

Study of invisible nucleon decay, n→ννν, and a forbidden nuclear transition in the Kamiokande detector

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