Measurement of the transverse asymmetry of γ rays in the Sn 117 (n,γ) Sn 118 reaction

S. Endo; T. Okudaira; R. Abe; H. Fujioka; K. Hirota; A. Kimura; M. Kitaguchi; T. Oku; K. Sakai; T. Shima; Hajime Shimizu; S. Takada; S. Takahashi; T. Yamamoto; H. Yoshikawa; T. Yoshioka

doi:10.1103/PhysRevC.106.064601

Measurement of the transverse asymmetry of γ rays in the Sn 117 (n,γ) Sn 118 reaction

S. Endo, T. Okudaira, R. Abe, H. Fujioka, K. Hirota, A. Kimura, M. Kitaguchi, T. Oku, K. Sakai, T. Shima, Hajime Shimizu, S. Takada, S. Takahashi, T. Yamamoto, H. Yoshikawa, T. Yoshioka

Research output: Contribution to journal › Article › peer-review

Abstract

Largely enhanced parity-violating effects observed in compound resonances induced by epithermal neutrons are currently attributed to the mixing of parity-unfavored partial amplitudes in the entrance channel of the compound states. Furthermore, it is proposed that the same mechanism that enhances the parity violation also enhances the breaking of time-reversal invariance in the compound nucleus. The entrance-channel mixing induces energy-dependent spin-angular correlations of individual γ rays emitted from the compound nuclear state. For a detailed study of the mixing model, the γ-ray yield in the reaction of Sn117(n,γ)Sn118 was measured using a pulsed beam of polarized epithermal neutrons and Ge detectors. An angular dependence of asymmetric γ-ray yields for the orientation of the neutron polarization was observed.

Original language	English
Article number	064601
Journal	Physical Review C
Volume	106
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.106.064601
Publication status	Published - 2022 Dec
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.106.064601

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Endo, S., Okudaira, T., Abe, R., Fujioka, H., Hirota, K., Kimura, A., Kitaguchi, M., Oku, T., Sakai, K., Shima, T., Shimizu, H., Takada, S., Takahashi, S., Yamamoto, T., Yoshikawa, H., & Yoshioka, T. (2022). Measurement of the transverse asymmetry of γ rays in the Sn 117 (n,γ) Sn 118 reaction. Physical Review C, 106(6), [064601]. https://doi.org/10.1103/PhysRevC.106.064601

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title = "Measurement of the transverse asymmetry of γ rays in the Sn 117 (n,γ) Sn 118 reaction",

abstract = "Largely enhanced parity-violating effects observed in compound resonances induced by epithermal neutrons are currently attributed to the mixing of parity-unfavored partial amplitudes in the entrance channel of the compound states. Furthermore, it is proposed that the same mechanism that enhances the parity violation also enhances the breaking of time-reversal invariance in the compound nucleus. The entrance-channel mixing induces energy-dependent spin-angular correlations of individual γ rays emitted from the compound nuclear state. For a detailed study of the mixing model, the γ-ray yield in the reaction of Sn117(n,γ)Sn118 was measured using a pulsed beam of polarized epithermal neutrons and Ge detectors. An angular dependence of asymmetric γ-ray yields for the orientation of the neutron polarization was observed.",

author = "S. Endo and T. Okudaira and R. Abe and H. Fujioka and K. Hirota and A. Kimura and M. Kitaguchi and T. Oku and K. Sakai and T. Shima and Hajime Shimizu and S. Takada and S. Takahashi and T. Yamamoto and H. Yoshikawa and T. Yoshioka",

note = "Funding Information: The authors would like to thank the staff of beamline 04 for the maintenance of the germanium detectors, and the MLF and J-PARC for operating the accelerators and the neutron production target. The neutron experiments at the MLF of J-PARC were performed under the user program (Proposals No. 2019A0185). This work was supported by the Neutron Science Division of KEK as an S-type research project with Program No. 2018S12. This work was partially supported by MEXT KAKENHI Grant No. JP19GS0210 and JSPS KAKENHI Grants No. JP17H02889, No. JP19K21047, and No. JP20K14495. Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

year = "2022",

month = dec,

doi = "10.1103/PhysRevC.106.064601",

language = "English",

volume = "106",

journal = "Physical Review C",

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AU - Endo, S.

AU - Okudaira, T.

AU - Abe, R.

AU - Fujioka, H.

AU - Hirota, K.

AU - Kimura, A.

AU - Kitaguchi, M.

AU - Oku, T.

AU - Sakai, K.

AU - Shima, T.

AU - Shimizu, Hajime

AU - Takada, S.

AU - Takahashi, S.

AU - Yamamoto, T.

AU - Yoshikawa, H.

AU - Yoshioka, T.

N1 - Funding Information: The authors would like to thank the staff of beamline 04 for the maintenance of the germanium detectors, and the MLF and J-PARC for operating the accelerators and the neutron production target. The neutron experiments at the MLF of J-PARC were performed under the user program (Proposals No. 2019A0185). This work was supported by the Neutron Science Division of KEK as an S-type research project with Program No. 2018S12. This work was partially supported by MEXT KAKENHI Grant No. JP19GS0210 and JSPS KAKENHI Grants No. JP17H02889, No. JP19K21047, and No. JP20K14495. Publisher Copyright: © 2022 American Physical Society.

PY - 2022/12

Y1 - 2022/12

N2 - Largely enhanced parity-violating effects observed in compound resonances induced by epithermal neutrons are currently attributed to the mixing of parity-unfavored partial amplitudes in the entrance channel of the compound states. Furthermore, it is proposed that the same mechanism that enhances the parity violation also enhances the breaking of time-reversal invariance in the compound nucleus. The entrance-channel mixing induces energy-dependent spin-angular correlations of individual γ rays emitted from the compound nuclear state. For a detailed study of the mixing model, the γ-ray yield in the reaction of Sn117(n,γ)Sn118 was measured using a pulsed beam of polarized epithermal neutrons and Ge detectors. An angular dependence of asymmetric γ-ray yields for the orientation of the neutron polarization was observed.

AB - Largely enhanced parity-violating effects observed in compound resonances induced by epithermal neutrons are currently attributed to the mixing of parity-unfavored partial amplitudes in the entrance channel of the compound states. Furthermore, it is proposed that the same mechanism that enhances the parity violation also enhances the breaking of time-reversal invariance in the compound nucleus. The entrance-channel mixing induces energy-dependent spin-angular correlations of individual γ rays emitted from the compound nuclear state. For a detailed study of the mixing model, the γ-ray yield in the reaction of Sn117(n,γ)Sn118 was measured using a pulsed beam of polarized epithermal neutrons and Ge detectors. An angular dependence of asymmetric γ-ray yields for the orientation of the neutron polarization was observed.

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Measurement of the transverse asymmetry of γ rays in the Sn 117 (n,γ) Sn 118 reaction

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