1
|
Go S, Tsuzuki Y, Yoneda H, Ichikawa Y, Ikeda T, Imai N, Imamura K, Niikura M, Nishimura D, Mizuno R, Takeda S, Ueno H, Watanabe S, Saito TY, Shimoura S, Sugawara S, Takamine A, Takahashi T. Demonstration of nuclear gamma-ray polarimetry based on a multi-layer CdTe Compton camera. Sci Rep 2024; 14:2573. [PMID: 38336981 PMCID: PMC11294463 DOI: 10.1038/s41598-024-52692-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Accepted: 01/22/2024] [Indexed: 02/12/2024] Open
Abstract
To detect and track structural changes in atomic nuclei, the systematic study of nuclear levels with firm spin-parity assignments is important. While linear polarization measurements have been applied to determine the electromagnetic character of gamma-ray transitions, the applicable range is strongly limited due to the low efficiency of the detection system. The multi-layer Cadmium-Telluride (CdTe) Compton camera can be a state-of-the-art gamma-ray polarimeter for nuclear spectroscopy with the high position sensitivity and the detection efficiency. We demonstrated the capability to operate this detector as a reliable gamma-ray polarimeter by using polarized 847-keV gamma rays produced by the [Formula: see text]([Formula: see text]) reaction. By combining the experimental data and simulated calculations, the modulation curve for the gamma ray was successfully obtained. A remarkably high polarization sensitivity was achieved, compatible with a reasonable detection efficiency. Based on the obtained results, a possible future gamma-ray polarimetery is discussed.
Collapse
Affiliation(s)
- S Go
- RIKEN Cluster for Pioneering Research, RIKEN, Wako, Saitama, Japan.
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama, Japan.
| | - Y Tsuzuki
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama, Japan
- Department of Physics, The University of Tokyo, Tokyo, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo, Chiba, Japan
| | - H Yoneda
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama, Japan
- Lehrstuhl für Astronomie, Fakultät für Physik und Astronomie, Institut für Theoretische Physik und Astrophysik, Julius-Maximilians-Universität Würzburg, Emil-Fischer-Str. 31, 97074, Würzburg, Germany
| | - Y Ichikawa
- Department of Physics, Kyushu University, Fukuoka, Japan
| | - T Ikeda
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama, Japan
| | - N Imai
- Center for Nuclear Study, The University of Tokyo, Wako, Saitama, Japan
| | - K Imamura
- RIKEN Cluster for Pioneering Research, RIKEN, Wako, Saitama, Japan
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama, Japan
| | - M Niikura
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama, Japan
| | - D Nishimura
- Department of Natural Sciences, Tokyo City University, Tokyo, Japan
| | - R Mizuno
- Department of Physics, The University of Tokyo, Tokyo, Japan
| | - S Takeda
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo, Chiba, Japan
| | - H Ueno
- RIKEN Cluster for Pioneering Research, RIKEN, Wako, Saitama, Japan
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama, Japan
| | - S Watanabe
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa, Japan
| | - T Y Saito
- Center for Nuclear Study, The University of Tokyo, Wako, Saitama, Japan
- Atomic, Molecular, and Optical Physics Laboratory, RIKEN, Wako, Saitama, Japan
| | - S Shimoura
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama, Japan
- Center for Nuclear Study, The University of Tokyo, Wako, Saitama, Japan
| | - S Sugawara
- Department of Natural Sciences, Tokyo City University, Tokyo, Japan
| | - A Takamine
- RIKEN Cluster for Pioneering Research, RIKEN, Wako, Saitama, Japan
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama, Japan
| | - T Takahashi
- Department of Physics, The University of Tokyo, Tokyo, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo, Chiba, Japan
| |
Collapse
|
2
|
Nakamura N, Numadate N, Oishi S, Tong XM, Gao X, Kato D, Odaka H, Takahashi T, Tsuzuki Y, Uchida Y, Watanabe H, Watanabe S, Yoneda H. Strong Polarization of a J=1/2 to 1/2 Transition Arising from Unexpectedly Large Quantum Interference. PHYSICAL REVIEW LETTERS 2023; 130:113001. [PMID: 37001086 DOI: 10.1103/physrevlett.130.113001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Accepted: 01/27/2023] [Indexed: 06/19/2023]
Abstract
We experimentally show that the 1s^{2}2s^{2}2p_{1/2}-1s2s^{2}2p_{1/2}^{2} transition in Pb^{77+} emitted in dielectronic recombination of Pb^{78+} is strongly polarized, although it is an intrinsically unpolarized J=1/2 to 1/2 transition. This unanticipated polarization is shown to be due to quantum interference with radiative recombination. The interference effect has been studied on an asymmetric resonance profile but has never been studied on polarization. In this Letter, we show that the effect on polarization can arise from a different cross term than that responsible for asymmetry, resulting in unexpectedly large polarization even for a nearly symmetric resonance suggesting a small interference.
Collapse
Affiliation(s)
- Nobuyuki Nakamura
- Institute for Laser Science, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Naoki Numadate
- Institute for Laser Science, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Simpei Oishi
- Institute for Laser Science, The University of Electro-Communications, Tokyo 182-8585, Japan
| | - Xiao-Min Tong
- Center for Computational Sciences, University of Tsukuba, Ibaraki 305-8573, Japan
| | - Xiang Gao
- Institute for Applied Physics and Computational Mathematics, Beijing 100088, China
| | - Daiji Kato
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
| | - Hirokazu Odaka
- Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), Institutes for Advanced Study (UTIAS), The University of Tokyo, Chiba 277-8583, Japan
| | - Tadayuki Takahashi
- Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), Institutes for Advanced Study (UTIAS), The University of Tokyo, Chiba 277-8583, Japan
| | - Yutaka Tsuzuki
- Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), Institutes for Advanced Study (UTIAS), The University of Tokyo, Chiba 277-8583, Japan
| | - Yuusuke Uchida
- Department of Physics, School of Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan
| | - Hirofumi Watanabe
- Center of Applied Superconductivity and Sustainable Energy Research, Chubu University, Aichi 487-8501, Japan
| | - Shin Watanabe
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), Institutes for Advanced Study (UTIAS), The University of Tokyo, Chiba 277-8583, Japan
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa 252-5210, Japan
| | | |
Collapse
|
3
|
Circular Polarimetry of Hard X-rays with Rayleigh Scattering. ATOMS 2022. [DOI: 10.3390/atoms10040140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We present a theoretical investigation of the elastic Rayleigh scattering of X-rays by atomic targets. Special attention is paid to the question of how the polarization of the scattered photons is affected if the incident light is itself polarized. In particular, we found that the circular polarization of the incoming X-rays may lead to a remarkable modification of the linear polarization of the scattered photons. Based on this ’circular-to-linear-polarization-transfer’ and on the fact that the linear polarization of X-rays can be conveniently observed by solid-state Compton detectors, we argue that Rayleigh scattering may be used as a tool for circular polarimetry of hard X-rays. To illustrate our proposal, we performed detailed calculations of 145 and 500 keV circularly polarized photons scattered by lead atoms. Based on these calculations, we found that the photon scattering under large angles with respect to the incident beam direction is most favorable for the circular polarimetry of hard X-rays. In particular, for 500 keV photon energy and scattering angles around 70 deg we found a remarkable modification of the linear polarization of scattered light for the case when the incident radiation is circularly polarized.
Collapse
|