Angular distribution of γ rays from the p -wave resonance of Sn 118

J. Koga; S. Takada; S. Endo; H. Fujioka; K. Hirota; K. Ishizaki; A. Kimura; M. Kitaguchi; Y. Niinomi; T. Okudaira; K. Sakai; T. Shima; H. M. Shimizu; Y. Tani; T. Yamamoto; H. Yoshikawa; T. Yoshioka

doi:10.1103/PhysRevC.105.054615

Angular distribution of γ rays from the p -wave resonance of Sn 118

J. Koga, S. Takada, S. Endo, H. Fujioka, K. Hirota, K. Ishizaki, A. Kimura, M. Kitaguchi, Y. Niinomi, T. Okudaira, K. Sakai, T. Shima, H. M. Shimizu, Y. Tani, T. Yamamoto, H. Yoshikawa, T. Yoshioka

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Abstract

The neutron energy-dependent angular distribution of γ rays from the Sn117(n,γ) reaction was measured with germanium detectors and a pulsed neutron beam. The angular distribution was clearly observed in γ-ray emissions with an energy of 9327 keV which corresponds to the transition from a neutron resonance of Sn117+n to the ground state of Sn118. The angular distribution causes an angular-dependent asymmetric resonance shape. An asymmetry ALH was defined as (NL-NH)/(NL+NH), where NL and NH are integrated values for lower- and higher-energy regions of a neutron resonance, respectively. We found that the ALH has the angular dependence of (Acosθγ+B), where θγ is the γ-ray emission angle with respect to the incident neutron momentum, with A=0.394±0.073 and B=0.118±0.029 in the 1.33 eV p-wave resonance.

Original language	English
Article number	054615
Journal	Physical Review C
Volume	105
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.105.054615
Publication status	Published - 2022 May
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.105.054615

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Koga, J., Takada, S., Endo, S., Fujioka, H., Hirota, K., Ishizaki, K., Kimura, A., Kitaguchi, M., Niinomi, Y., Okudaira, T., Sakai, K., Shima, T., Shimizu, H. M., Tani, Y., Yamamoto, T., Yoshikawa, H., & Yoshioka, T. (2022). Angular distribution of γ rays from the p -wave resonance of Sn 118. Physical Review C, 105(5), [054615]. https://doi.org/10.1103/PhysRevC.105.054615

@article{4e2c6da6dfb54902b08b42abdd019734,

title = "Angular distribution of γ rays from the p -wave resonance of Sn 118",

abstract = "The neutron energy-dependent angular distribution of γ rays from the Sn117(n,γ) reaction was measured with germanium detectors and a pulsed neutron beam. The angular distribution was clearly observed in γ-ray emissions with an energy of 9327 keV which corresponds to the transition from a neutron resonance of Sn117+n to the ground state of Sn118. The angular distribution causes an angular-dependent asymmetric resonance shape. An asymmetry ALH was defined as (NL-NH)/(NL+NH), where NL and NH are integrated values for lower- and higher-energy regions of a neutron resonance, respectively. We found that the ALH has the angular dependence of (Acosθγ+B), where θγ is the γ-ray emission angle with respect to the incident neutron momentum, with A=0.394±0.073 and B=0.118±0.029 in the 1.33 eV p-wave resonance.",

author = "J. Koga and S. Takada and S. Endo and H. Fujioka and K. Hirota and K. Ishizaki and A. Kimura and M. Kitaguchi and Y. Niinomi and T. Okudaira and K. Sakai and T. Shima and Shimizu, {H. M.} and Y. Tani and T. Yamamoto and H. Yoshikawa and T. Yoshioka",

note = "Funding Information: The authors would like to thank the staff of ANNRI for the maintenance of the detectors, and MLF and J-PARC for operating the accelerator and the neutron-production target. The experiments at MLF of J-PARC were performed under the program (Proposals No. 2017L2000, 2017A0158, 2018B0193, and 2019A0184). 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 the Grant-in-aids program numbers 19GS0210 and 17H02889 by the Ministry of Education of the Japanese Government. Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

year = "2022",

month = may,

doi = "10.1103/PhysRevC.105.054615",

language = "English",

volume = "105",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

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T1 - Angular distribution of γ rays from the p -wave resonance of Sn 118

AU - Koga, J.

AU - Takada, S.

AU - Endo, S.

AU - Fujioka, H.

AU - Hirota, K.

AU - Ishizaki, K.

AU - Kimura, A.

AU - Kitaguchi, M.

AU - Niinomi, Y.

AU - Okudaira, T.

AU - Sakai, K.

AU - Shima, T.

AU - Shimizu, H. M.

AU - Tani, Y.

AU - Yamamoto, T.

AU - Yoshikawa, H.

AU - Yoshioka, T.

N1 - Funding Information: The authors would like to thank the staff of ANNRI for the maintenance of the detectors, and MLF and J-PARC for operating the accelerator and the neutron-production target. The experiments at MLF of J-PARC were performed under the program (Proposals No. 2017L2000, 2017A0158, 2018B0193, and 2019A0184). 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 the Grant-in-aids program numbers 19GS0210 and 17H02889 by the Ministry of Education of the Japanese Government. Publisher Copyright: © 2022 American Physical Society.

PY - 2022/5

Y1 - 2022/5

N2 - The neutron energy-dependent angular distribution of γ rays from the Sn117(n,γ) reaction was measured with germanium detectors and a pulsed neutron beam. The angular distribution was clearly observed in γ-ray emissions with an energy of 9327 keV which corresponds to the transition from a neutron resonance of Sn117+n to the ground state of Sn118. The angular distribution causes an angular-dependent asymmetric resonance shape. An asymmetry ALH was defined as (NL-NH)/(NL+NH), where NL and NH are integrated values for lower- and higher-energy regions of a neutron resonance, respectively. We found that the ALH has the angular dependence of (Acosθγ+B), where θγ is the γ-ray emission angle with respect to the incident neutron momentum, with A=0.394±0.073 and B=0.118±0.029 in the 1.33 eV p-wave resonance.

AB - The neutron energy-dependent angular distribution of γ rays from the Sn117(n,γ) reaction was measured with germanium detectors and a pulsed neutron beam. The angular distribution was clearly observed in γ-ray emissions with an energy of 9327 keV which corresponds to the transition from a neutron resonance of Sn117+n to the ground state of Sn118. The angular distribution causes an angular-dependent asymmetric resonance shape. An asymmetry ALH was defined as (NL-NH)/(NL+NH), where NL and NH are integrated values for lower- and higher-energy regions of a neutron resonance, respectively. We found that the ALH has the angular dependence of (Acosθγ+B), where θγ is the γ-ray emission angle with respect to the incident neutron momentum, with A=0.394±0.073 and B=0.118±0.029 in the 1.33 eV p-wave resonance.

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DO - 10.1103/PhysRevC.105.054615

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SN - 2469-9985

VL - 105

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 054615

ER -

Angular distribution of γ rays from the p -wave resonance of Sn 118

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