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| Format: | Preprint |
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2026
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| Online Access: | https://arxiv.org/abs/2601.17393 |
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| _version_ | 1866912865897676800 |
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| author | Matsumura, Riku Tanaka, Junki Yoshida, Kazuki Ahn, Deuk Soon Beaumel, Didier Bian, Jiawei Cai, Jiawei Chazono, Yoshiki Chen, Fengyi Dozono, Masanori Endo, Fumitaka Franchoo, Serge Furuno, Tatsuya Furukawa, Fumiya Gernhäuser, Roman Hahn, Kevin Insik Hwang, Jongwon Higuchi, Koshi Hijikata, Yuto Honda, Yuya Hong, Byungsik Ideguchi, Eiji Ikemizu, Gen Inoue, Azusa Itsuno, Katsuhide Iwasaki, Ryota Kato, Ryo Kawabata, Takahiro Kawase, Shoichiro Kawata, Keita Khandelwal, Mukul Kim, Mingyu Kim, Sunji Kobayashi, Nobuyuki Kubota, Yuki Lee, CheongSoo Li, Yutian Li, Qite Lin, Yifan Maeda, Yukie Matsuda, Yohei Miki, Kenjiro Mitsui, Maoto Miyagawa, Taichi Mozumdar, Nikhil Murata, Motoki Nakada, Tomoya Nakama, Hide Oh, Geonhee Ogata, Kazuyuki Ogawa, Shoya Ogio, Shingo Ota, Shinsuke Paschalis, Stefanos Petri, Marina Pohl, Thomas Saito, Futa Sakajo, Soki Sasagawa, Yohei Sato, Takafumi Shibakita, Hiroaki Sonoda, Hideya Sugiyama, Taiki Suzuki, Yumaro Tamii, Atsushi Tsuji, Ryotaro Typel, Stefan Umemoto, Satoshi Wang, Xuan Wang, Cheng Wenhao, Guo Whitehead, Matthew Yamamoto, Riku Yamasaki, Nobuhiro Yamazaki, Shunpei Yang, Zaihong Yano, Takayuki Yasumura, Kohki Yoshida, Ryosuke Zhang, Jichao Zhou, Kaijie Zenihiro, Juzo Uesaka, Tomohiro |
| author_facet | Matsumura, Riku Tanaka, Junki Yoshida, Kazuki Ahn, Deuk Soon Beaumel, Didier Bian, Jiawei Cai, Jiawei Chazono, Yoshiki Chen, Fengyi Dozono, Masanori Endo, Fumitaka Franchoo, Serge Furuno, Tatsuya Furukawa, Fumiya Gernhäuser, Roman Hahn, Kevin Insik Hwang, Jongwon Higuchi, Koshi Hijikata, Yuto Honda, Yuya Hong, Byungsik Ideguchi, Eiji Ikemizu, Gen Inoue, Azusa Itsuno, Katsuhide Iwasaki, Ryota Kato, Ryo Kawabata, Takahiro Kawase, Shoichiro Kawata, Keita Khandelwal, Mukul Kim, Mingyu Kim, Sunji Kobayashi, Nobuyuki Kubota, Yuki Lee, CheongSoo Li, Yutian Li, Qite Lin, Yifan Maeda, Yukie Matsuda, Yohei Miki, Kenjiro Mitsui, Maoto Miyagawa, Taichi Mozumdar, Nikhil Murata, Motoki Nakada, Tomoya Nakama, Hide Oh, Geonhee Ogata, Kazuyuki Ogawa, Shoya Ogio, Shingo Ota, Shinsuke Paschalis, Stefanos Petri, Marina Pohl, Thomas Saito, Futa Sakajo, Soki Sasagawa, Yohei Sato, Takafumi Shibakita, Hiroaki Sonoda, Hideya Sugiyama, Taiki Suzuki, Yumaro Tamii, Atsushi Tsuji, Ryotaro Typel, Stefan Umemoto, Satoshi Wang, Xuan Wang, Cheng Wenhao, Guo Whitehead, Matthew Yamamoto, Riku Yamasaki, Nobuhiro Yamazaki, Shunpei Yang, Zaihong Yano, Takayuki Yasumura, Kohki Yoshida, Ryosuke Zhang, Jichao Zhou, Kaijie Zenihiro, Juzo Uesaka, Tomohiro |
| contents | The $(p,p α)$ reaction offers a direct means to probe preformed $α$-cluster structures in nuclei under quasi-free scattering conditions. Previous studies around 100 MeV provided valuable insights into $α$ clustering, but quantitative comparison with microscopic cluster wave functions remained limited due to strong distortion effects. At higher energies, the reaction mechanism becomes simpler and the distorted-wave impulse approximation (DWIA) provides a more reliable framework for quantitative analysis. In the present work, the $^{40}$Ca$(p,pα)$ reaction was measured at an incident energy of 392 MeV using the high-resolution Grand Raiden and LAS spectrometers at RCNP. Despite the small cross section in this energy region, the achieved resolution allowed clear separation of the ground and excited states of the residual $^{36}$Ar nucleus, and corresponding momentum distributions were extracted. DWIA calculations using a Woods-Saxon $α+ ^{36}$Ar bound-state wave function yielded an experimental spectroscopic factor of $ S_{\mathrm{FAC}}^{\mathrm{WS}} = 0.51 \pm 0.05 $, consistent with the previous result at 101.5 MeV $(0.52 \pm 0.23 )$. This agreement demonstrates that the reaction mechanism is well described across a wide energy range. The present study establishes the feasibility of high-precision $(p,pα)$ measurements at several hundred MeV and highlights their potential as a quantitative probe of $α$ clustering in medium-mass nuclei, forming the basis for systematic studies in both stable and unstable systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_17393 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Establishing the $^{40}$Ca$(p,p α)$ reaction at 392 MeV under quasi-free scattering conditions Matsumura, Riku Tanaka, Junki Yoshida, Kazuki Ahn, Deuk Soon Beaumel, Didier Bian, Jiawei Cai, Jiawei Chazono, Yoshiki Chen, Fengyi Dozono, Masanori Endo, Fumitaka Franchoo, Serge Furuno, Tatsuya Furukawa, Fumiya Gernhäuser, Roman Hahn, Kevin Insik Hwang, Jongwon Higuchi, Koshi Hijikata, Yuto Honda, Yuya Hong, Byungsik Ideguchi, Eiji Ikemizu, Gen Inoue, Azusa Itsuno, Katsuhide Iwasaki, Ryota Kato, Ryo Kawabata, Takahiro Kawase, Shoichiro Kawata, Keita Khandelwal, Mukul Kim, Mingyu Kim, Sunji Kobayashi, Nobuyuki Kubota, Yuki Lee, CheongSoo Li, Yutian Li, Qite Lin, Yifan Maeda, Yukie Matsuda, Yohei Miki, Kenjiro Mitsui, Maoto Miyagawa, Taichi Mozumdar, Nikhil Murata, Motoki Nakada, Tomoya Nakama, Hide Oh, Geonhee Ogata, Kazuyuki Ogawa, Shoya Ogio, Shingo Ota, Shinsuke Paschalis, Stefanos Petri, Marina Pohl, Thomas Saito, Futa Sakajo, Soki Sasagawa, Yohei Sato, Takafumi Shibakita, Hiroaki Sonoda, Hideya Sugiyama, Taiki Suzuki, Yumaro Tamii, Atsushi Tsuji, Ryotaro Typel, Stefan Umemoto, Satoshi Wang, Xuan Wang, Cheng Wenhao, Guo Whitehead, Matthew Yamamoto, Riku Yamasaki, Nobuhiro Yamazaki, Shunpei Yang, Zaihong Yano, Takayuki Yasumura, Kohki Yoshida, Ryosuke Zhang, Jichao Zhou, Kaijie Zenihiro, Juzo Uesaka, Tomohiro Nuclear Experiment The $(p,p α)$ reaction offers a direct means to probe preformed $α$-cluster structures in nuclei under quasi-free scattering conditions. Previous studies around 100 MeV provided valuable insights into $α$ clustering, but quantitative comparison with microscopic cluster wave functions remained limited due to strong distortion effects. At higher energies, the reaction mechanism becomes simpler and the distorted-wave impulse approximation (DWIA) provides a more reliable framework for quantitative analysis. In the present work, the $^{40}$Ca$(p,pα)$ reaction was measured at an incident energy of 392 MeV using the high-resolution Grand Raiden and LAS spectrometers at RCNP. Despite the small cross section in this energy region, the achieved resolution allowed clear separation of the ground and excited states of the residual $^{36}$Ar nucleus, and corresponding momentum distributions were extracted. DWIA calculations using a Woods-Saxon $α+ ^{36}$Ar bound-state wave function yielded an experimental spectroscopic factor of $ S_{\mathrm{FAC}}^{\mathrm{WS}} = 0.51 \pm 0.05 $, consistent with the previous result at 101.5 MeV $(0.52 \pm 0.23 )$. This agreement demonstrates that the reaction mechanism is well described across a wide energy range. The present study establishes the feasibility of high-precision $(p,pα)$ measurements at several hundred MeV and highlights their potential as a quantitative probe of $α$ clustering in medium-mass nuclei, forming the basis for systematic studies in both stable and unstable systems. |
| title | Establishing the $^{40}$Ca$(p,p α)$ reaction at 392 MeV under quasi-free scattering conditions |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2601.17393 |