Time-Reversal Measurement of the p -Wave Cross Sections of the Be 7 (n,α) He 4 Reaction for the Cosmological Li Problem

T. Kawabata; Y. Fujikawa; T. Furuno; T. Goto; T. Hashimoto; M. Ichikawa; M. Itoh; N. Iwasa; Y. Kanada-En'Yo; A. Koshikawa; S. Kubono; E. Miyawaki; M. Mizuno; K. Mizutani; T. Morimoto; M. Murata; T. Nanamura; S. Nishimura; S. Okamoto; Y. Sakaguchi; I. Sakata; A. Sakaue; R. Sawada; Y. Shikata; Y. Takahashi; D. Takechi; T. Takeda; C. Takimoto; M. Tsumura; K. Watanabe; S. Yoshida

doi:10.1103/PhysRevLett.118.052701

Time-Reversal Measurement of the p -Wave Cross Sections of the Be 7 (n,α) He 4 Reaction for the Cosmological Li Problem

T. Kawabata, Y. Fujikawa, T. Furuno, T. Goto, T. Hashimoto, M. Ichikawa, M. Itoh, N. Iwasa, Y. Kanada-En'Yo, A. Koshikawa, S. Kubono, E. Miyawaki, M. Mizuno, K. Mizutani, T. Morimoto, M. Murata, T. Nanamura, S. Nishimura, S. Okamoto, Y. SakaguchiI. Sakata, A. Sakaue, R. Sawada, Y. Shikata, Y. Takahashi, D. Takechi, T. Takeda, C. Takimoto, M. Tsumura, K. Watanabe, S. Yoshida

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Abstract

The cross sections of the Be7(n,α)He4 reaction for p-wave neutrons were experimentally determined at Ec.m.=0.20-0.81 MeV slightly above the big bang nucleosynthesis (BBN) energy window for the first time on the basis of the detailed balance principle by measuring the time-reverse reaction. The obtained cross sections are much larger than the cross sections for s-wave neutrons inferred from the recent measurement at the n-TOF facility in CERN, but significantly smaller than the theoretical estimation widely used in the BBN calculations. The present results suggest the Be7(n,α)He4 reaction rate is not large enough to solve the cosmological lithium problem, and this conclusion agrees with the recent result from the direct measurement of the s-wave cross sections using a low-energy neutron beam and the evaluated nuclear data library ENDF/B-VII.1.

Original language	English
Article number	052701
Journal	Physical Review Letters
Volume	118
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.118.052701
Publication status	Published - 2017 Feb 3

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Kawabata, T., Fujikawa, Y., Furuno, T., Goto, T., Hashimoto, T., Ichikawa, M., Itoh, M., Iwasa, N., Kanada-En'Yo, Y., Koshikawa, A., Kubono, S., Miyawaki, E., Mizuno, M., Mizutani, K., Morimoto, T., Murata, M., Nanamura, T., Nishimura, S., Okamoto, S., ... Yoshida, S. (2017). Time-Reversal Measurement of the p -Wave Cross Sections of the Be 7 (n,α) He 4 Reaction for the Cosmological Li Problem. Physical Review Letters, 118(5), Article 052701. https://doi.org/10.1103/PhysRevLett.118.052701

@article{a2b11862c65c47d6b2e02e694ce67749,

title = "Time-Reversal Measurement of the p -Wave Cross Sections of the Be 7 (n,α) He 4 Reaction for the Cosmological Li Problem",

abstract = "The cross sections of the Be7(n,α)He4 reaction for p-wave neutrons were experimentally determined at Ec.m.=0.20-0.81 MeV slightly above the big bang nucleosynthesis (BBN) energy window for the first time on the basis of the detailed balance principle by measuring the time-reverse reaction. The obtained cross sections are much larger than the cross sections for s-wave neutrons inferred from the recent measurement at the n-TOF facility in CERN, but significantly smaller than the theoretical estimation widely used in the BBN calculations. The present results suggest the Be7(n,α)He4 reaction rate is not large enough to solve the cosmological lithium problem, and this conclusion agrees with the recent result from the direct measurement of the s-wave cross sections using a low-energy neutron beam and the evaluated nuclear data library ENDF/B-VII.1.",

author = "T. Kawabata and Y. Fujikawa and T. Furuno and T. Goto and T. Hashimoto and M. Ichikawa and M. Itoh and N. Iwasa and Y. Kanada-En'Yo and A. Koshikawa and S. Kubono and E. Miyawaki and M. Mizuno and K. Mizutani and T. Morimoto and M. Murata and T. Nanamura and S. Nishimura and S. Okamoto and Y. Sakaguchi and I. Sakata and A. Sakaue and R. Sawada and Y. Shikata and Y. Takahashi and D. Takechi and T. Takeda and C. Takimoto and M. Tsumura and K. Watanabe and S. Yoshida",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = feb,

day = "3",

doi = "10.1103/PhysRevLett.118.052701",

language = "English",

volume = "118",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "5",

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Kawabata, T, Fujikawa, Y, Furuno, T, Goto, T, Hashimoto, T, Ichikawa, M, Itoh, M , Iwasa, N, Kanada-En'Yo, Y, Koshikawa, A, Kubono, S, Miyawaki, E, Mizuno, M, Mizutani, K, Morimoto, T, Murata, M, Nanamura, T, Nishimura, S, Okamoto, S, Sakaguchi, Y, Sakata, I, Sakaue, A, Sawada, R, Shikata, Y, Takahashi, Y, Takechi, D, Takeda, T, Takimoto, C, Tsumura, M, Watanabe, K & Yoshida, S 2017, 'Time-Reversal Measurement of the p -Wave Cross Sections of the Be 7 (n,α) He 4 Reaction for the Cosmological Li Problem', Physical Review Letters, vol. 118, no. 5, 052701. https://doi.org/10.1103/PhysRevLett.118.052701

TY - JOUR

T1 - Time-Reversal Measurement of the p -Wave Cross Sections of the Be 7 (n,α) He 4 Reaction for the Cosmological Li Problem

AU - Kawabata, T.

AU - Fujikawa, Y.

AU - Furuno, T.

AU - Goto, T.

AU - Hashimoto, T.

AU - Ichikawa, M.

AU - Itoh, M.

AU - Iwasa, N.

AU - Kanada-En'Yo, Y.

AU - Koshikawa, A.

AU - Kubono, S.

AU - Miyawaki, E.

AU - Mizuno, M.

AU - Mizutani, K.

AU - Morimoto, T.

AU - Murata, M.

AU - Nanamura, T.

AU - Nishimura, S.

AU - Okamoto, S.

AU - Sakaguchi, Y.

AU - Sakata, I.

AU - Sakaue, A.

AU - Sawada, R.

AU - Shikata, Y.

AU - Takahashi, Y.

AU - Takechi, D.

AU - Takeda, T.

AU - Takimoto, C.

AU - Tsumura, M.

AU - Watanabe, K.

AU - Yoshida, S.

PY - 2017/2/3

Y1 - 2017/2/3

N2 - The cross sections of the Be7(n,α)He4 reaction for p-wave neutrons were experimentally determined at Ec.m.=0.20-0.81 MeV slightly above the big bang nucleosynthesis (BBN) energy window for the first time on the basis of the detailed balance principle by measuring the time-reverse reaction. The obtained cross sections are much larger than the cross sections for s-wave neutrons inferred from the recent measurement at the n-TOF facility in CERN, but significantly smaller than the theoretical estimation widely used in the BBN calculations. The present results suggest the Be7(n,α)He4 reaction rate is not large enough to solve the cosmological lithium problem, and this conclusion agrees with the recent result from the direct measurement of the s-wave cross sections using a low-energy neutron beam and the evaluated nuclear data library ENDF/B-VII.1.

AB - The cross sections of the Be7(n,α)He4 reaction for p-wave neutrons were experimentally determined at Ec.m.=0.20-0.81 MeV slightly above the big bang nucleosynthesis (BBN) energy window for the first time on the basis of the detailed balance principle by measuring the time-reverse reaction. The obtained cross sections are much larger than the cross sections for s-wave neutrons inferred from the recent measurement at the n-TOF facility in CERN, but significantly smaller than the theoretical estimation widely used in the BBN calculations. The present results suggest the Be7(n,α)He4 reaction rate is not large enough to solve the cosmological lithium problem, and this conclusion agrees with the recent result from the direct measurement of the s-wave cross sections using a low-energy neutron beam and the evaluated nuclear data library ENDF/B-VII.1.

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UR - http://www.scopus.com/inward/citedby.url?scp=85012253475&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.118.052701

DO - 10.1103/PhysRevLett.118.052701

M3 - Article

C2 - 28211732

AN - SCOPUS:85012253475

SN - 0031-9007

VL - 118

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

M1 - 052701

ER -

Time-Reversal Measurement of the p -Wave Cross Sections of the Be 7 (n,α) He 4 Reaction for the Cosmological Li Problem

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