VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 54 (2021)

Nuclear Science and Transmutation Research Division
Nuclear Spectroscopy Laborarory
1. Abstract

The research group has conducted nuclear-physics studies utilizing stopped/slowed-down radioactive-isotope (RI) beams mainly
at the RIBF facility. These studies are based on the technique of nuclear spectroscopy such as β-ray-detected NMR (β-NMR), γPAD (Perturbed Angular Distribution), laser, and Mössbauer among other methods that takes advantage of intrinsic nuclear properties
such as nuclear spins, electromagnetic moments, and decay modes. In particular, techniques and devices for the production of spincontrolled RI beams have been developed and combined to the spectroscopic studies, which enable high-sensitivity measurements ofspin precessions/resonances through a change in the angular distribution of radiations. Anomalous nuclear structures and propertiesof far unstable nuclei are investigated from thus determined spin-related observables. The group also aims to apply such techniques tointerdisciplinary fields such as fundamental physics and materials science by exploiting nuclear probes.

2. Major Research Subjects
(1)
(2)
(3)
(4)

Nuclear spectroscopy utilizing spin-oriented fast RI beams
Nuclear/Atomic laser spectroscopy & SLOWRI R&DApplication of RI probes to materials science
Fundamental physics: Study of symmetry

3. Summary of Research Activity(1) Nuclear spectroscopy utilizing spin-oriented fast RI beams
Measurements of static electromagnetic nuclear moments over a substantial region of the nuclear chart have been conducted forstructure studies on the nuclei far from the β-decay stability. Utilizing nuclear spin orientation phenomena of RIs created in the
projectile-fragmentation reaction, ground- and excited-state electromagnetic nuclear moments been determined by means of the βray-detected nuclear magnetic resonance (β-NMR) and the γ-ray time diﬀerential perturbed angular distribution (γ-TDPAD) methods.
In particular, a new method developed for controlling spin in a system of rare RIs, taking advantage of the mechanism of the two-step
projectile fragmentation reaction combined with the momentum-dispersion matching technique, has been developed and employedmaking fully use of world’s highest intensity rare RIBs delivered from BigRIPS for rare isotopes.
(2) Nuclear/Atomic laser spectroscopy & SLOWRI R&D
The group has been conducting system development for nuclear laser spectroscopy from the following two approaches in orderto realize experiments for rare isotopes at RIBF. One is collinear laser spectroscopy for a large variety of elements using sloweddown RI beams produced via a projectile-fragmentation reaction, which can be achieved only by the universal low-energy RI-beamdelivery system, SLOWRI, under installation in collaboration with the SLOWRI Team. This slowed-down RI-beam scheme enables
to perform high-precision laser spectroscopy even with fast-fragmentation-based RIBs without the elemental limitation problematicin the ISOL-based RIBs.
The other approach is a new method utilizing superfluid helium (He II) as a stopping medium of energetic RI beams, in which thecharacteristic atomic properties of ions surrounded by superfluid helium enables us to perform unique nuclear laser spectroscopy. RIions trapped in He II are known to exhibit a characteristic excitation spectrum significantly blue-shifted compared with the emission
one. Consequently, the background derived from the excitation-laser stray light, which often causes serious problems in measurements,
can be drastically reduced.
(3) Application of RI probes to materials science
The application of RI and heavy ion beams as a probe for condensed matter studies is also conducted by the group. The microscopic material dynamics and properties have been investigated through the deduced internal local fields and the spin relaxation of
RI probes based on various spectroscopies utilizing RI probes such as β-NMR/NQR spectroscopy, Mössbauer spectroscopy, the γ-ray
time diﬀerential perturbed angular correlation (γ-TDPAC) spectroscopy. Furthermore, studies on the control of electrical conductivityof diamond by boron and nitrogen implantation are ongoing.
Provided that highly spin-polarized RI probes are produced independently of their element properties and doped into a substanceas an impurity, the constituent particle of the substance can be substituted by the same element RI probe without changing the material
structure. This scheme provides a new opportunity for materials-science researches, but a key technology, production of elementindependent highly spin-polarized RI beams, has not yet been achieved. In this subject, the group has conducted R&D studies torealize an ultra-slow & highly-spin-polarized RI beams, based on the technique of the atomic beam resonance.
(4) Fundamental physics: Study of symmetry
The nuclear spins of stable and unstable isotopes sometimes play important roles in fundamental physics research. New experimental methods and devices have been developed for studies of the violation of time reversal symmetry (T-violation) using spinpolarized nuclei. These experiments aim to detect the small frequency shift in the spin precession arising from new mechanisms
beyond the Standard Model.

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VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 54 (2021)

Members
Director
Hideki UENO
Research/Technical Scientists
Hiroki YAMAZAKI (Senior Research Scientist)
Aiko TAKAMINE (Research Scientist)

Isao WATANABE (Senior Research Scientist)

Research & Development Scientist
Tetsu SONODA
Contract Researcher
Takashi ABE
Special Postdoctoral Researcher
Momo MUKAI
Postdoctoral Researchers
Minori TAJIMA

Kei IMAMURA (CPR)

Research Associate
Aleksey GLADKOV
Senior Visiting Scientists
Yukari MATSUO (Hosei Univ.)

Takaharu OTSUKA (Univ. of Tokyo)

Visiting Scientists
Dimiter L. BALABANSKI (IFIN-HH)
Georgi GEORGIEV (CNRS-IN2P3)
Yuichi ICHIKAWA (Kyushu Univ.)
Yoshio KOBAYASHI (Univ. of Electro-Commun.)
Kenya KUBO (Int’l Christian Univ.)
Kensaku MATSUTA (Osaka Univ.)
Jun MIYAZAKI (Tokyo Denki Univ.)
Takamasa MOMOSE (The Univ. of British Columbia)
Jiro MURATA (Rikkyo Univ.)

Jin NAKAMURA (Univ. of Electro-Commun.)
Hiroki NISHIBATA (Kyushu Univ.)
Tomoya SATO (Tokyo Tech)
Wataru SATO (Kanazawa Univ.)
Andrew E. STUCHBERY (The Australian Nat’l Univ.)
Satoshi TSUTSUI (Japan Synchrotron Radiation Res. Inst.)
Yasuhiro YAMADA (Tokyo Univ. Sci)
Deyan T. YORDANOV (CNRS-IN2P3)
Akihiro YOSHIMI (Okayama Univ.)

Student Trainees
Sai AKIMOTO (Hosei Univ.)
Miru DOI (Hosei Univ.)
Timothy J. GRAY (The Australian Nat’l Univ.)
Kentaro HAMANO (Univ. of Electro-Commun.)
Manami ITO (Hosei Univ.)
Kyouichi IZUOKA (Tokyo Univ. Sci)
Masato KIJI (Univ. of Electro-Commun.)

Masaki NISHIMURA (Hosei Univ.)
Shinichi OKAMURA (Univ. of Ferrara)
Yuika TAKEUCHI (Hosei Univ.)
Satoshi TANAKA (Hosei Univ.)
Kenta TSUBURA (Hosei Univ.)
Takumi YAMAMOTO (Hosei Univ.)
Mio YOSHIDA (Univ. of Electro-Commun.)Temporary Staﬃng
Emiko SUGISAKI

Naoko YUASA

AssistantIzumi YOSHIDA

List of Publications & Presentations
Publications[Original Papers]
M. Tajima, A. Takamine, M. Wada, and H. Ueno, “Oﬄine ion source for laser spectroscopy of RI at the SLOWRI,” Nucl. Instrum.
Methods Phys. Res. B 486, 48–54 (2021).
N. Tsunoda, T. Otsuka, K. Takayanagi, N. Shimizu, T. Suzuki, Y. Utsuno, S. Yoshida, and H. Ueno, “The impact of nuclear shape on theemergence of the neutron dripline,” Nature 587, 66–71 (2020).
M. Mukai, Y. Hirayama, Y. X. Watanabe, S. Schiﬀmann, J. Ekman, M. Godefroid, P. Schury, Y. Kakiguchi, M. Oyaizu, M. Wada,
S. C. Jeong, J. Y. Moon, J. H. Park, H. Ishiyama, S. Kimura, H. Ueno, M. Ahmed, A. Ozawa, H. Watanabe, S. Kanaya, and H. Miyatake,“In-gas-cell laser resonance ionization spectroscopy of 196, 197, 198 Ir,” Phys. Rev. C 102, 054307 (2020).

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VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 54 (2021)

H. Suzuki, K. Yoshida, N. Fukuda, H. Takeda, Y. Shimizu, D. S. Ahn, T. Sumikama, N. Inabe, T. Komatsubara, H. Sato, Z. Korkulu,
K. Kusaka, Y. Yanagisawa, M. Ohtake, H. Ueno, T. Kubo, S. Michimasa, N. Kitamura, K. Kawata, N. Imai, O. B. Tarasov, D. Bazin,
J. Nolen, and W. F. Henning, “Experimental studies of the two-step scheme with an intense radioactive 132 Sn beam for next-generation
production of very neutron-rich nuclei,” Phys. Rev. C 102, 064615 (2020).
Y. Sakemi, T. Aoki, R. Calabrese, H. Haba, K. Harada, T. Hayamizu, Y. Ichikawa, K. Jungmann, A. Kastberg, Y. Kotaka, Y. Matsuda,
Y. Matsuo, H. Nagahama, K. Nakamura, M. Otsuka, N. Ozawa1, K. S. Tanaka, A. Uchiyama, H. Ueno, and L. Willmann, “Fundamental
physics with cold radioactive atoms,” AIP Conf. Proc. 2319, 080020-1–6 (2021).
H. Watanabe, Y. X. Watanabe, Y. Hirayama, A. N. Andreyev, T. Hashimoto, F. G. Kondev, G. J. Lane, Yu. A. Litvinov, J. J. Liu, H. Miyatake, J. Y. Moon, A. I. Morales, M. Mukai, S. Nishimur, T. Niwase, M. Rosenbusch, P. Schury, Y. Shi, M. Wada, and P. M. Walker,“Beta decay of the axially asymmetric ground state of 192 Re,” Phys. Lett. B 814, 136088-1–6 (2020).
P. M. Walker, Y. Hirayama, G. J. Lane, H. Watanabe, G. D. Dracoulis, M. Ahmed, M. Brunet, T. Hashimoto, S. Ishizawa, F. G. Kondev,
Yu. A. Litvinov, H. Miyatake, J. Y. Moon, M. Mukai, T. Niwase, J. H. Park, Zs. Podolyák, M. Rosenbusch, P. Schury, M. Wada,
X. Y. Watanabe, W. Y. Liang, and F. R. Xu, “Properties of 187 Ta revealed through isomeric decay,” Phys. Rev. Lett. 125, 192505-1–5(2020).
Y. X. Watanabe, M. Ahmed, Y. Hirayama, M. Mukai, J. H. Park, P. Schury, Y. Kakiguchi, S. Kimura, A. Ozawa, M. Oyaizu, M. Wada,
H. Miyatake, “Deexcitation γ-ray transitions from the long-lived I π = 13/2+ metastable state in 195 Os,” Phys. Rev. C 101, 041305(2020).
Y. Hirayama, P. Schury, M. Mukai, H. Choi, S. Imamura, X. Y. Watanabe, M. Wada, H. Watanabe, and H. Miyatake, “Three-dimensional
tracking multi-segmented proportional gas counter for β-decay spectroscopy of unstable nuclei,” Nucl. Instrum. Methods Phys. Res.
A 997, 165152-1–10 (2021).
Y. Ichikawa, “Nuclear-moment measurements of exotic nuclei using spin-oriented RI beams at RIBF,” AIP Conf. Proc. 2319, 080021(2021).
Y. Ichikawa, H. Nishibata, Y. Tsunoda, A. Takamine, K. Imamura, T. Fujita, T. Sato, S. Momiyama, Y. Shimizu, D. S. Ahn, K. Asahi,
H. Baba, D. L. Balabanski, F. Boulay, J. M. Daugas, T. Egami, N. Fukuda, C. Funayama, T. Furukawa, G. Georgiev, A. Gladkov,
N. Inabe, Y. Ishibashi, Y. Kobayashi, S. Kojima, A. Kusoglu, T. Kawaguchi, T. Kawamura, I. Mukul, M. Niikura, T. Nishizaka,
A. Odahara, Y. Ohtomo, T. Otsuka, D. Ralet, G. S. Simpson, T. Sumikama, H. Suzuki, H. Takeda, L. C. Tao, Y. Togano, D. Tomonaga,
H. Ueno, H. Yamazaki, and X. F. Yang, “Magnetic moment of the isomeric state of 75 Cu measured with a highly spin-aligned beam,”
JPS Conf. Proc. 32, 010047-1–4 (2020).
S. Bagchi, R. Kanungo, Y. K. Tanaka, H. Geissel, P. Doornenbal, W. Horiuchi, G. Hagen T. Suzuki, N. Tsunoda, D. S. Ahn, H. Baba,
K. Behr, F. Browne, S. Chen, M. L. Cortés, A. Estradé, N. Fukuda, M. Holl, K. Itahashi, N. Iwasa, G. R. Jansen, W. G. Jiang, S. Kaur,A. O. Macchiavelli, S. Y. Matsumoto, S. Momiyama, I. Murray, T. Nakamura, S. J. Novario, H. J. Ong, T. Otsuka, T. Papenbrock,
S. Paschalis, A. Prochazka, C. Scheidenberger, P. Schrock, Y. Shimizu, D. Steppenbeck, H. Sakurai, D. Suzuki, H. Suzuki, M. Takechi,
H. Takeda, S. Takeuchi, R. Taniuchi, K. Wimmer, and K. Yoshida, “Two-neutron halo is unveiled in 29 F,” Phys. Rev. Lett. 124,
22250-1–7 (2020).
N. Mărginean, D. Little, Y. Tsunoda, S. Leoni, R. V. F. Janssens, B. Fornal, T. Otsuka, C. Michelagnoli, L. Stan, F. C. L. Crespi,
C. Costache, R. Lica, M. Sferrazza, A. Turturica, A. D. Ayangeakaa, K. Auranen, M. Barani, P. C. Bender, S. Bottoni, M. Boromiza,
A. Bracco, S. Călinescu, C. M. Campbell, M. P. Carpenter, P. Chowdhnury, M. Ciemała, N. Cieplicka-Oryǹczak, D. Cline, C. Clisu,
H. L. Crawford, I. E. Dinescu, J. Dudouet, D. Filipescu, N. Florea, A. M. Forney, S. Fracassetti, A. Gade, I. Gheorghe, A. B. Hayes,
I. Harca, J. Henderson, A. Ionescu, Ł. W. Iskra, M. Jentschel, F. Kandzia, Y. H. Kim, F. G. Kondev, G. Korschinek, U. Köster,
Krishichayan, M. Krzysiek, T. Lauritsen, J. Li, R. Mărginean, E. A. Maugeri, C. Mihai, R. E. Mihai, A. Mitu, P. Mutti, A. Negret,
C. R. Niţă, A. Olăcel, A. Oprea, S. Pascu, C. Petrone, C. Porzio, D. Rhodes, D. Seweryniak, D. Schumann, C. Sotty, S. M. Stolze,
R. Şuvăilă, S. Toma, S. Ujeniuc, W. B. Walters, C. Y. Wu, J. Wu, S. Zhu, and S. Ziliani, “Shape coexistence at zero spin in 64 Ni driven
by the monopole tensor interaction,” Phys. Rev. Lett. 125, 102502-1–7 (2020).
M. M. Juhász, Z. Elekes, D. Sohler, Y. Utsuno, K. Yoshida, T. Otsuka, K. Ogata, P. Doornenbal, A. Obertelli, H. Baba, F. Browne,
D. Calvet, F. Château, S. Chen, N. Chiga, A. Corsi, M. L. Cortés, A. Delbart, and L. Zanetti, “First spectroscopic study of 51 Ar by the(p, 2p) reaction,” Phys. Lett. B 814, 136108-1–8 (2021).
C. Porzio, C. Michelagnoli, N. Cieplicka-Oryǹczak, M. Sferrazza, S. Leoni, B. Fornal, Y. Tsunoda, T. Otsuka, S. Bottoni, C. Costache,
F. C. L. Crespi, Ł. W. Iskra, M. Jentschel, F. Kandzia, Y. -H. Kim, U. Köster, N. Mărginean, C. Mihai, P. Mutti, and A. Turturică,“Detailed low-spin spectroscopy of 65 Ni via neutron capture reaction,” Phys. Rev. C 102, 064310-1–13 (2020).
N. Shimizu, Y. Tsunoda, Y. Utsuno, and T. Otsuka, “Variational approach with the superposition of the symmetry-restored quasiparticlevacua for nuclear shell-model calculations,” Phys. Rev. C 103, 014312-1–11 (2021).
F. L. Bello Garrote, E. Sahin, Y. Tsunoda, T. Otsuka, A. Görgen, M. Niikura, S. Nishimura, G. de Angelis, G. Benzoni, A. I. Morales,
V. Modamio, Z. Y. Xu, H. Baba, F. Browne, A. M. Bruce, S. Ceruti, F. C. L. Crespi, R. Daido, M. -C. Delattre, P. Doornenbal,
Zs. Dombradi, Y. Fang, S. Franchoo, G. Gey, A. Gottardo, K. Hadyńska-Klȩk, T. Isobe, P. R. John, H. S. Jung, I. Kojouharov, T. Kubo,
N. Kurz, I. Kuti, Z. Li, G. Lorusso, I. Matea, K. Matsui, D. Mengoni, T. Miyazaki, S. Momiyama, P. Morfouace, D. R. Napoli,
F. Naqvi, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, S. Rice, H. Sakurai, H. Schaﬀner, L. Sinclair, P. -A. Söderström, D. Sohler,
I. G. Stefan, T. Sumikama, D. Suzuki, R. Taniuchi, J. Taprogge, Zs. Vajta, J. J. Valiente-Dobón, H. Watanabe, V. Werner, J. Wu, A. Yagi,
M. Yalcinkaya, R. Yokoyama, and K. Yoshinaga, “β Decay of 75 Ni and the systematics of the low-lying level structure of neutron-rich
odd-A Cu isotopes,” Phys. Rev. C 102, 034314-1–13 (2020).
Y. Tsunoda and T. Otsuka, “Triaxial rigidity of 166 Er and its Bohr-model realization,” Phys. Rev. C 103, L021303-1–6 (2021).
S. Leoni, B. Fornal, N. Marginean, C. Michelagnoli, J. Wilson, M. Sferrazza, Y. Tsunoda, and T. Otsuka, “Shape-coexistence studies in
the ni isotopic chain by using the selectivity of diﬀerent reaction mechanisms,” Acta Phys. Pol. B 51, 807–815 (2020).
P. -A. Söderström, L. Capponi, E. Açıksöz, T. Otsuka, N. Tsoneva, Y. Tsunoda, D. L. Balabanski, N. Pietralla, G. L. Guardo, D. Lattuada,- 229 -

VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 54 (2021)

H. Lenske, C. Matei, D. Nichita, A. Pappalardo, and T. Petruse, “Electromagnetic character of the competitive γγ/γ-decay from 137m Ba,”
Nat. Commun. 11, 3242-1–8 (2020).
Y. Sato, Y. Yamada, Y. Kobayashi, M. K. Kubo, M. Mihara, W. Sato, J. Miyazaki, T. Nagatomo, T. Ando, N. Takahama, K. Some, M. Sato,S. Sato, and A. Kitagawa, “In-beam Mössbauer spectra of 57 Mn implanted into lithium aluminium hydride,” Appl. Radiat. Isot. 170,
109582-1–7 (2021).
Y. Yamada, Y. Sato, Y. Kobayashi, T. Ando, N. Takahama, K. Some, M. Sato, M. Mihara, M. K. Kubo, W. Sato, J. Miyazaki, T. Nagatomo,
J. Kobayashi, A. Okazawa, S. Sato, A. Kitagawa, “In-beam Mössbauer spectra for 57 Mn implanted sulfur hexafluoride,” Hyperfine
Interact. 241, 15-1–6 (2020).

Presentations[International Conferences/Workshops]
A. Takamine (invited), “SLOWRI rf gas catcher development toward symbiotic mass measurement at F11,” RIBF User Meeting 2020,
online, September 2–10, 2020.
M. Mukai, “In-gas-jet laser spectroscopy of 199–202 Pt, 195–198 Ir, 193–198 Os,” SSRI-PNS Collaboration Meeting 2020, online, Japan, September
3, 2020.
H. Ueno (invited), “Nuclear spectroscopy with spin-polarized RI beams,” The International School for Strangeness Nuclear Physics 2020
(SNP School 2020), online & J-PARC, Ibaraki, Japan, December 2–5, 2020.

[Domestic Conferences/Workshops]
上野秀樹 (依頼講演), 「高偏極 RI ビームの生成と核・物質科学研究への応用」, 新学術領域研究「宇宙観測検出器と量子ビームの出会い。新たな応用への架け橋。」第 2 回領域研究会, オンライン開催, 2020 年 7 月 27–28 日.
今村慧 (口頭発表), 「RI 原子線磁気共鳴に向けた中性化装置開発」，新学術領域「宇宙観測検出器と量子ビームの出会い．新たな応用への架け橋．」第 2 回領域全体会議，オンライン開催, 2020 年 7 月 27–28 日.
飯村俊, 高峰愛子, M. Rosenbusch, 和田道治, S. Chen, J. Liu, W. Xian, D. Hou, S. Yan, P. Schury, 園田哲, 小島隆夫, 渡辺裕,
小田原厚子, 石山博恒, 「理研 BigRIPS SLOWRI における RF カーペットガスセルの開発」, 日本物学会 2020 年秋季大会,
オンライン開催, 2021 年 9 月 14–17 日.
三原基嗣, 松多健策, 福田光順, 若林諒, 沖本直哉, 福留美樹, 泉川卓司, 野口法秀, 生越瑞揮, 大坪隆, 西村太樹, 髙橋弘幸, 菅原奏来,
Aleksey Gladkov, 北川敦志, 佐藤眞二, 「短寿命酸素 NMR プローブ核 19 O の物質科学利用」, 日本物学会 2020 年秋季大会, オンライン開催, 2021 年 9 月 14–17 日.
角田佑介, 大塚孝治, 清水則孝, 本間道雄, 宇都野穣, 「モンテカルロ殻模型による Z = 28 近傍の核構造の研究」, 日本物学会 2020年秋季大会, オンライン開催, 2021 年 9 月 14–17 日.
阿部喬 (口頭発表), “Ab initio description of light nuclei from no-core Monte Carlo shell model,” 第 5 回クラスター階層領域研究会, オンライン開催, 2020 年 9 月 24–25 日.
上野秀樹 (依頼講演), 「RI・重イオンビームの学際的利用に向けた研究開発」, 新領域開拓課題 物質階層原理 & ヘテロ界面研究合
同年次成果報告会, オンライン開催, 2021 年 2 月 8–9 日.
市川雄一 (招待講演), 「低エネルギースピン物理」, 日本のスピン物理学の展望研究会, 島根県松江市, オンライン開催, 2021 年 2 月
23–24 日.
田島美典, 高峰愛子, 飯村秀紀, 和田道治, H. A. Schuessler, 上野秀樹, 「コリニアレーザー分光による四重極変形度測定を通した原子核構造研究にむけた開発 II」, 日本物学会第 76 回年次大会, オンライン開催, 2021 年 3 月 12–15 日.
小澤直也, 長濱弘季, 早水友洋, 中村圭佑, 佐藤幹, 永瀬慎太郎, 小高康照, 鎌倉恵太, 田中香津生, 大塚未来, 青木貴稔, 市川雄一,
高峰愛子, 羽場宏光, 上野秀樹, 酒見泰寛, 「フランシウム原子の電気双極子能率探索のための表面電離イオン源の開発」, 日本物学会第 76 回年次大会, オンライン開催, 2021 年 3 月 12–15 日.
飯村俊, 高峰愛子, M. Rosenbusch, 和田道治, S. Chen, D. Hou, J. Liu, W. Xian, S. Yan, P. Schury, 木村創大, 庭瀬暁隆, 伊藤由太,
園田哲, 小島隆夫, 渡辺裕, N. Sara, 道正新一郎, 西村俊二, 小田原厚子, 石山博恒, 「理研 BigRIPS SLOWRI における RF カーペッ
トガスセルの開発—オンライン実験と質量測定—」, 日本物学会第 76 回年次大会, オンライン開催, 2021 年 3 月 12–15 日.
大谷優里花, 三原基嗣, 松多健策, 福田光順, 若林諒, 沖本直哉, 福留美樹, 木村容子, 高山元, 泉川卓司, 野口法秀, 生越瑞揮, 佐藤弥紗,
高津和哉, 大坪隆, 西村太樹, 髙橋弘幸, 菅原奏来, Aleksey Gladkov, 北川敦志, 佐藤眞二, 百田佐多生, 奥村寛之, 森口哲朗, 小沢顕,
「19 O の偏極ビーム生成と固体燃料電池研究への応用」, 日本物学会第 76 回年次大会, オンライン開催, 2021 年 3 月 12–15 日.
清水則孝, 角田佑介, 宇都野穣, 大塚孝治, 「準粒子真空基底によるモンテカルロ殻模型の拡張」, 日本物学会第 76 回年次大会, オンライン開催, 2021 年 3 月 12–15 日.
大塚孝治, 角田佑介, 角田直文, 阿部喬, 清水則孝, P. Van Duppen, 高柳和雄, 鈴木俊夫, 宇都野穣, 上野秀樹, 「原子核物理の再出発」,
KEK 理論センター研究会「原子核・ハドロン物理 2020」, オンライン開催, 2020 年 10 月 6 日.
大塚孝治, 「原子核物理の再出発」, ELPH 研究会 C028「電子散乱による原子核研究—原子核の電荷密度・陽子・ 中性子の分布と半径—」, オンライン開催, 2021 年 3 月 18–19 日.
高峰愛子 (招待講演), “Isotope shift measurement project at the SLOWRI facility,” ELPH 研究会 C028「電子散乱による原子核研究—
原子核の電荷密度・陽子・中性子の分布と半径—」, オンライン開催, 2021 年 3 月 18–19 日.
大塚孝治, 角田直文, 高柳和雄, 清水則孝, 鈴木俊夫, 宇都野穣, 上野秀樹, 「原子核物理の再出発」, “Neutron driplines and shapeevolution of atomic nuclei,” 第 3 回クラスター階層領域研究会, オンライン開催, 2020 年 5 月 18 日.

[University Lectures]
H. Ueno, “Applied Radiation Engineering,” Department of Nuclear Engineering and Management, Graduate School of Engineering, the- 230 -

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University of Tokyo.
H. Yamazaki, “Physics in Daily Life (in Japanese),” General Education Course, Otsuma Women’s University.
A. Takamine, “Exercises in Basic Physics I (in Japanese),” Department of Advanced Sciences, Faculty of Science and Engineering, Hosei
University.
A. Takamine, “Exercises in Basic Physics II (in Japanese),” Department of Advanced Sciences, Faculty of Science and Engineering, Hosei
University.

Press Releases
新聞等掲載: 「中性子過剰ジルコニウム同位体の励起状態での変形」, フジサンケイビジネスアイ, 2020 年 5 月 22 日.
プレスリリース: 東京大学, 理化学研究所, 日本原子力研究開発機構, 上智大学, 日本大学, 宇都宮大学共同記者発表, 「原子核の存在限界（中性子ドリップライン）の新たなメカニズム －中性子は原子核にいくつ入るか－」, 2020 年 11 月 5 日.
新聞等掲載: 「原子核の最大中性子数決定 －新たなメカニズム提唱－」, 科学新聞, 2020 年 11 月 27 日.

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