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RIKEN Accel. Prog. Rep. 56 (2023)

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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Members
Director
Hideki UENO
Research/Technical Scientists
Hiroki YAMAZAKI (Senior Research Scientist)
Isao WATANABE (Senior Research Scientist)

Aiko TAKAMINE (Research Scientist)
Shintaro GO (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 A. GLADKOVInternational Program Associate
Muhammad A. SYAKUUR (Univ. Padjadjaran)
Senior Visiting Scientists
Yukari MATSUO (Hosei Univ.)

Takaharu OTSUKA (Univ. of Tokyo)

Visiting Scientists
Dimiter Loukanov BALABANSKI (IFIN-HH)
Jean-Michel DAUGAS (CNRS)
Georgi GEORGIEV (CNRS-IN2P3)
Yuichi ICHIKAWA (Kyushu Univ.)
Anders KASTBERG (Univ. of Tokyo)
Yoshio KOBAYASHI (Univ. of Electro-Commun.)
Kenya M. KUBO (Int’l Christian Univ.)
Jun MIYAZAKI (Tokyo Denki Univ.)
Takamasa MOMOSE (The Univ. of British Columbia)
Jin NAKAMURA (Univ. of Electro-Commun.)

Hiroki NISHIBATA (Kyushu Univ.)
Tomoya SATO (Tokyo Tech)
Wataru SATO (Kanazawa Univ.)
Tadayuki TAKAHASHI (Univ. of Tokyo)
Shinichiro TAKEDA (Univ. of Tokyo)
Satoshi TSUTSUI (Japan Synchrotron Radiation Res. Inst.)
Shin WATANABE (JAXA)
Deyan T. YORDANOV (CNRS)
Akihiro YOSHIMI (Okayama Univ.)

Student Trainees
Sai AKIMOTO (Hosei Univ.)
Manami ITO (Hosei Univ.)
Satoshi TANAKA (Hosei Univ.)
Hiroki ENDO (Hosei Univ.)
Yusuke FUKUZAWA (Hosei Univ.)
Kai KIKUCHI (Hosei Univ.)
Rikuta MITSUYASU (Hosei Univ.)
Takaya MIWA (Hosei Univ.)

Shoki TAKAHASHI (Hosei Univ.)
Shinya SASAMORI (Hosei Univ.)
Yutaka TSUZUKI (Univ. of Tokyo)
Mio YOSHIDA (Univ. of Electro-Commun.)
Yoko KIMURA (Osaka Univ.)
Takato SUGISAKI (Osaka Univ.)
Roman L. WIXINGER (Univ. of Tokyo)
Konstantin STOYCHEV (Univ. of Paris-Saclay)

AssistantIzumi YOSHIDA- 253 -

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RIKEN Accel. Prog. Rep. 56 (2023)

List of Publications & Presentations
Publications[Original Papers]
M. Mukai, Y. Hirayama, Y. X. Watanabe, H. Watanabe, H. Koura, S. C. Jeong, H. Miyatake, M. Brunet, S. Ishizawa, F. G. Kondev,
G. J. Lane, Yu. A. Litvinov, T. Niwase, M. Oyaizu, Zs. Podolyák, M. Rosenbusch, P. Schury, M. Wada, and P. M. Walker, “Groundstate β-decay spectroscopy of 187 Ta,” Phys. Rev. C 105, 034331-1–6 (2022). DOI: 10.1103/PhysRevC.105.034331 .
Y. Ishibashi, A. Gladkov, Y. Ichikawa, A. Takamine, H. Nishibata, T. Sato, H. Yamazaki, T. Abe, J. M. Daugas, T. Egami, T. Fujita,
G. Georgiev, K. Imamura, T. Kawaguchi, W. Kobayashi, Y. Nakamura, A. Ozawa, M. Sanjo, N. Shimizu, D. Tominaga, L. C. Tao,
K. Asahi, and H. Ueno, “Nuclear magnetic moment of the neutron-rich nucleus 21 O,” Phys. Rev. C 107, 024306-1–7 (2023).
DOI: 10.1103/PhysRevC.107.024306 .
S. Iimura, M. Rosenbusch, A. Takamine, Y. Tsunoda, M. Wada, S. Chen, D. Hou, W. Xian, H. Ishiyama, S. Yan, P. Schury, H. Crawford,
P. Doornenbal, Y. Hirayama, Y. Ito, S. Kimura, T. Koiwai, T. Kojima, H. Koura, J. Lee, J. Liu, S. Michimasa, H. Miyatake, J. Moon,
S. Naimi, S. Nishimura, T. Niwase, A. Odahara, T. Otsuka, S. Paschalis, M. Petri, N. Shimizu, T. Sonoda, D. Suzuki, Y. Watanabe,
K. Wimmer, and H. Wollnik, “Study of the N = 32 and N = 34 shell gap for Ti and V by the ﬁrst high-precision multireﬂection time-ofﬂight mass measurements at BigRIPS-SLOWRI,” Phys. Rev. Lett. 130, 012501-1–6 (2023). DOI: 10.1103/PhysRevLett.130.012501 .
T. Otsuka, T. Abe, T. Yoshida, Y. Tsunoda, N. Shimizu, N. Itagaki, Y. Utsuno, J. Vary, P. Maris, and H. Ueno, “α-clustering inatomic nuclei from ﬁrst principles with statistical learning and the Hoyle state character,” Nat. Commum. 13, 2234-1–10 (2022).
DOI: 10.1038/s41467-022-29582-0 .
K. Nakamura, S. Nagase, T. Nakashita, T. Hayamizu, T. Aoki, H. Nagahama, N. Ozawa, M. Sato, K. Yamane, M. Fukase, D. Uehara,
A. Takamine, and Y. Sakemi, “Development of a laser frequency stabilization and an optical transmission system for the francium
electric dipole moment search,” J. Phys. Conf. Ser. 2249, 012010-1–7 (2022). DOI: 10.1088/1742-6596/2249/1/012010 .
T. Hashimoto, S. Aikawa, T. Akaishi, H. Asano, M. Bazzi, D. A. Bennett, M. Berger, D. Bosnar, A. D. Butt, C. Curceanu, W. B. Doriese,
M. S. Durkin, Y. Ezoe, J. W. Fowler, H. Fujioka, J. D. Gard, C. Guaraldo, F. P. Gustafsson, C. Han, R. Hayakawa, R. S. Hayano,
T. Hayashi, J. P. Hays-Wehle, G. C. Hilton, T. Hiraiwa, M. Hiromoto, Y. Ichinohe1, M. Iio, Y. Iizawa, M. Iliescu, S. Ishimoto,
Y. Ishisaki, K. Itahashi, M. Iwasaki, Y. Ma, T. Murakami, R. Nagatomi, T. Nishi, H. Noda, H. Noumi, K. Nunomura, G. C. O’Neil,
T. Ohashi, H. Ohnishi, S. Okada, H. Outa, K. Piscicchia, C. D. Reintsema, Y. Sada, F. Sakuma, M. Sato, D. R. Schmidt, A. Scordo,
M. Sekimoto, H. Shi, K. Shirotori, D. Sirghi, F. Sirghi, K. Suzuki, D. S. Swetz, A. Takamine, K. Tanida, H. Tatsuno, C. Tripp,
J. Uhlig, J. N. Ullom, S. Yamada, T. Yamaga, T. Yamazaki, and J. Zmeskal (J-PARC E62 Collaboration), “Measurements of stronginteraction eﬀects in kaonic-helium isotopes at sub-eV precision with X-ray microcalorimeters,” Phys. Rev. Lett. 128, 112503-1–6(2022). DOI: 10.1103/PhysRevLett.128.112503 .
M. Rosenbusch, M. Wada, S. Chen, A. Takamine, S. Iimura, D. Hou, W. Xian, S. Yan, P. Schury, Y. Hirayama, Y. Ito, H. Ishiyama,
S. Kimura, T. Kojima, J. Lee, J. Liu, S. Michimasa, H. Miyatake, M. Mukai, J. Y. Moon, S. Nishimura, S. Naimi, T. Niwase, T. Sonoda,
Y. X. Watanabe, and H. Wollnik, “The new MRTOF mass spectrograph following the ZeroDegree spectrometer at RIKEN’s RIBF
facility,” Nucl. Instrum. Methods Phys. Res. A 1047, 167824-1–12 (2022). DOI: 10.1016/j.nima.2022.167824 .
D. S. Ahn, J. Amano, H. Baba, N. Fukuda, H. Geissel, N. Inabe, S. Ishikawa, N. Iwasa, T. Komatsubara, T. Kubo, K. Kusaka,
D. J. Morrissey, T. Nakamura, M. Ohtake, H. Otsu, T. Sakakibara, H. Sato, B. M. Sherrill, Y. Shimizu, T. Sumikama, H. Suzuki,
H. Takeda, O. B. Tarasov, H. Ueno, Y. Yanagisawa, and K. Yoshida, “Discovery of 39 Na,” Phys. Rev. Lett. 129, 212502-1–7 (2022).
DOI: 10.1103/PhysRevLett.129.212502 .
G. G. Kiss, A. Vitéz-Sveiczer, Y. Saito, A. Tarifeño-Saldivia, M. Pallas, J. L. Tain, I. Dillmann, J. Agramunt, A. Algora, C. DomingoPardo, A. Estrade, C. Appleton, J. M. Allmond, P. Aguilera, H. Baba, N. T. Brewer, C. Bruno, R. Caballero-Folch, F. Calvino,
P. J. Coleman-Smith, G. Cortes, T. Davinson, N. Fukuda, Z. Ge, S. Go, C. J. Griﬃn, R. K. Grzywacz, O. Hall, A. Horváth, J. Ha,
L. J. Harkness-Brennan, T. Isobe, D. Kahl, T. T. King, A. Korgul, S. Kovács, R. Krücken, S. Kubono, M. Labiche, J. Liu, J. Liang,
M. Madurga, K. Miernik, F. Molina, A. I. Morales, M. R. Mumpower, E. Nacher, A. Navarro, N. Nepal, S. Nishimura, M. PiersaSiłkowska, V. Phong, B. C. Rasco, B. Rubio, K. P. Rykaczewski, J. Romero-Barrientos, H. Sakurai, L. Sexton, Y. Shimizu, M. Singh,
T. Sprouse, T. Sumikama, R. Surman, H. Suzuki, T. N. Szegedi, H. Takeda, A. Tolosa, K. Wang, M. Wolinska-Cichocka, P. Woods,
R. Yokoyama, and Z. Xu, “Measuring the β-decay properties of neutron-rich exotic Pm, Sm, Eu, and Gd isotopes to constrain the
nucleosynthesis yields in the rare-earth region,” Astrophys. J. 936, 107-1–18 (2022). DOI: 10.3847/1538-4357/ac80fc .
V. H. Phong, S. Nishimura, G. Lorusso, T. Davinson, A. Estrade, O. Hall, T. Kawano, J. Liu, F. Montes, N. Nishimura, R. Grzywacz,
K. P. Rykaczewski, J. Agramunt, D. S. Ahn, A. Algora, J. M. Allmond, H. Baba, S. Bae, N. T. Brewer, C. G. Bruno, R. Caballero-Folch,
F. Calviño, P. J. Coleman-Smith, G. Cortes, I. Dillmann, C. Domingo-Pardo, A. Fijalkowska, N. Fukuda, S. Go, C. J. Griﬃn, J. Ha,
L. J. Harkness-Brennan, T. Isobe, D. Kahl, L. H. Khiem, G. G. Kiss, A. Korgul, S. Kubono, M. Labiche, I. Lazarus, J. Liang, Z. Liu,
K. Matsui, K. Miernik, B. Moon, A. I. Morales, P. Morrall, N. Nepal, R. D. Page, M. Piersa-Siłkowska, V. F. E. Pucknell, B. C. Rasco,
B. Rubio, H. Sakurai, Y. Shimizu, D. W. Stracener, T. Sumikama, H. Suzuki, J. L. Tain, H. Takeda, A. Tarifeño-Saldivia, A. TolosaDelgado, M. Wolińska-Cichocka, P. J. Woods, and R. Yokoyama, “β-delayed one and two neutron emission probabilities southeast of132
Sn and the odd-even systematics in r-process nuclide abundances,” Phys. Rev. Lett. 129, 172701-1–7 (2022). DOI: 10.1103/PhysRevLett.129.172701 .
M. Tanaka, P. Brionnet, M. Du, J. Ezold, K. Felker, B. J. P. Gall, S. Go, R. Grzywacz, H. Haba, K. Hagino, S. Hogle, S. Ishizawa, D. Kaji,
S. Kimura, T. T. King, Y. Komori, R. K. Lemon, M. G. Leonard, K. Morimoto, K. Morita, D. Nagae, N. Naito, T. Niwase, B. C. Rasco,J. B. Roberto, K. P. Rykaczewski, S. Sakaguchi, H. Sakai, Y. Shigekawa, D. W. Stracener, S. VanCleve, Y. Wang, K. Washiyama,
and T. Yokokita, “Probing optimal reaction energy for synthesis of element 119 from 51 V + 248 Cm reaction with quasielastic barrier
distribution measurement,” J. Phys. Soc. Jpn. 91, 084201-1–17 (2022). DOI: 10.7566/JPSJ.91.084201 .
Y. Hirayama, M. Mukai, Y. X. Watanabe, P. Schury, H. Nakada, J. Y. Moon, T. Hashimoto, S. Iimura, S. C. Jeong, M. Rosenbusch,- 254 -

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M. Oyaizu, T. Niwase, M. Tajima, A. Taniguchi, M. Wada, and H. Miyatake, “In-gas-cell laser resonance ionization spectroscopy of200, 201
Pt,” Phys. Rev. C 106, 034326-1–11 (2022). DOI: 10.1103/PhysRevC.106.034326 .
C. Amsler, H. Breuker, S. Chesnevskaya, G. Costantini, R. Ferragut, M. Giammarchi, A. Gligorova, G. Gosta, H. Higaki, E. D. Hunter,
C. Killian, V. Kletzl, V. Kraxberger, N. Kuroda, A. Lanz, M. Leali, V. Mäckel, G. Maero, C. Malbrunot, V. MascagnaY. Matsuda,
S. Migliorati, D. J. Murtagh, Y. Nagata, A. Nanda, L. Nowak, E. Pasino, M. Romé, M. C. Simon, M. Tajima, V. Toso, S. Ulmer,
L. Venturelli, A. Weiser, E. Widmann, T. Wolz, Y. Yamazaki, and J. Zmeskal, “Reducing the background temperature for cyclotron
cooling in a cryogenic Penning-Malmberg trap,” Phys. Plasmas 29, 083303-1–12 (2022). DOI: 10.1063/5.0093360 .
H. F. Li, S. Naimi, T. M. Sprouse, M. R. Mumpower, Y. Abe, Y. Yamaguchi, D. Nagae, F. Suzaki, M. Wakasugi, H. Arakawa, W. B. Dou,
D. Hamakawa, S. Hosoi, Y. Inada, D. Kajiki, T. Kobayashi, M. Sakaue, Y. Yokoda, T. Yamaguchi, R. Kagesawa, D. Kamioka,
T. Moriguchi, M. Mukai, A. Ozawa, S. Ota, N. Kitamura, S. Masuoka, S. Michimasa, H. Baba, N. Fukuda, Y. Shimizu, H. Suzuki,
H. Takeda, D. S. Ahn, M. Wang, C. Y. Fu, Q. Wang, S. Suzuki, Z. Ge, Yu. A. Litvinov, G. Lorusso, P. M. Walker, Zs. Podolyak, andT. Uesaka, “First application of mass measurements with the Rare-RI Ring reveals the solar r-process abundance trend at A = 122 andA = 123,” Phys. Rev. Lett. 128, 152701-1–6 (2022). DOI: 10.1103/PhysRevLett.128.152701 .
B. Moon, A. Gargano, H. Naidja, C. -B. Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P. Doornenbal, G. Lorusso,
Z. Patel, S. Rice, M. Si, L. Sinclair, P. -A. Soderstrom, T. Sumikama, H. Watanabe, J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba,
F. L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe,
H. S. Jung, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, Y. K. Kwon, C. S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura,
H. Nishibata, I. Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, and R. Yokoyama, “First observation of theπ0h11/2 ⊗ ν0h9/2 partner orbital conﬁguration in the odd-odd 138 I nucleus,” Phys. Rev. C 105, 034334-1–7 (2022). DOI: 10.1103/PhysRevC.105.034334 .
A. Yagi, A. Odahara, H. Nishibata, R. Lozeva, C. B. Moon, S. Nishimura, K. Yoshida, N. Yoshinaga, C. Watanabe, K. Higashiyama,
T. Shimoda, R. Daido, Y. Fang, P. S. Lee, B. Moon, P. Doornenbal, G. Lorusso, P. A. Söderström, T. Sumikama, H. Watanabe,
T. Isobe, H. Baba, H. Sakurai, F. Browne, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki,
N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, Y. Shimizu, D. Murai, F. L. Bello Garrote, J. M. Daugas, F. Didierjean, E. Ideguchi,
S. Iimura, T. Ishigaki, H. S. Jung, T. Komatsubara, Y. K. Kwon, C. S. Lee, S. Morimoto, M. Niikura, I. Nishizuka, and K. Tshoo,“Various nuclear structures in 140 Xe studied by β decay of ground and isomeric states in 140 I,” Phys. Rev. C 105, 044325-1–14 (2022).
DOI: 10.1103/PhysRevC.105.044325 .
D. Little, A. D. Ayangeakaa, R. V. F. Janssens, S. Zhu, Y. Tsunoda, T. Otsuka, B. A. Brown, M. P. Carpenter, A. Gade, D. Rhodes,
C. R. Hoﬀman, F. G. Kondev, T. Lauritsen, D. Seweryniak, J. Wu, J. Henderson, C. Y. Wu, P. Chowdhury, P. C. Bender, A. M. Forney,
and W. B. Walters, “Multistep Coulomb excitation of 64 Ni: Shape coexistence and nature of low-spin excitations,” Phys. Rev. C 106,
044313-1–13 (2022). DOI: 10.1103/PhysRevC.106.044313 .
T. Niwase, W. Xian, M. Wada, M. Rosenbusch, S. Chen, A. Takamine, J. Liu, S. Iimura, D. Hou, S. Yan, H. Ishiyama, H. Miyatake,S. Nishimura, D. Kaji, K. Morimoto, Y. Hirayama, Y. X. Watanabe, S. Kimura, P. Schury, and H. Wollnik, “Development of a β-TOF
detector: An enhancement of the α-TOF detector for use with β-decaying nuclides,” Prog. Theor. Exp. Phys. 2023, 50934006-1–9(2023). DOI: 10.1093/ptep/ptad039 .

[Book]
Y. Tsunoda and T. Otsuka, “Conﬁguration interaction approach to atomic nuclei: The shell model,” in Handbook of Nuclear Physics,
edited by I. Tanihata, H. Toki, and T. Kajino (Springer, Singapore, 2022). DOI: 10.1007/978-981-15-8818-1 17-1 .

Presentations[International Conferences/Workshops]
T. Abe (oral), “Alpha-cluster structure from ﬁrst principles,” YIPQS long-term workshop “Mean-ﬁeld and Cluster Dynamics in Nuclear
Systems 2022” (MCD2022), Kyoto, Japan & Online (Hybrid), May 9–June 17, 2022.
T. Abe (oral), “Alpha-cluster structure from ﬁrst principles,” RIKEN-YITP Workshop “Physics of RI: Recent Progress and Perspectives,”
Wako (RIKEN), Japan & Online (Hybrid), May 30–June 1, 2022.
K. Nakamura (oral), S. Nagase, T. Nakashita, T. Hayamizu, T. Aoki, H. Nagahama, N. Ozawa, K. Yamane, M. Fukase, D. Uehara,
A. Takamine, and Y. Sakemi, “400-m-Long polarization-maintaining ﬁbers for magneto-optical trapping of francium atoms,” The 15th
Paciﬁc Rim Conference on Lasers and Electro-Optics (CLEO Paciﬁc Rim, CLEO-PR 2022); International Symposium on Imaging,Sensing, and Optical Memory 2022 (ISOM’22); and the 13th International Conference on Optics-photonics Design and Fabrication(ODF’22), Sapporo, Japan, July 31–August 5, 2022.
K. Kikuchi (poster) et al., “Optimization of the stopping position of a highly energetic 84 Rb atoms injected into superﬂuid helium,” 29th
International Conference on Low Temperature Physics (LT29), Sapporo, Japan & Online (Hybrid), August 18–24, 2022.
H. Endo (poster) et al., “LIF spectrum analysis for measurement of Rb atomic bubble relaxation time in superﬂuid helium,” 29th International Conference on Low Temperature Physics (LT29), Sapporo, Japan & Online (Hybrid), August 18–24, 2022.
M. A. Syakuur (oral), A. R. Noviyanti, U. Widyaiswari, T Saragi, Risdiana, and I. Watanabe, “Comparison of eﬀective magnetic momenton impurity substitution dependence of Eu2−x Ce x Cu1−y (Zn, Ni)y O4+a−d ,” 29th International Conference on Low Temperature Physics(LT29), Sapporo, Japan & Online (Hybrid), August 18–24, 2022.
K. Imamura (poster) et al., “Laser spectroscopic method for the investigation of nuclear structure utilizing superﬂuid helium as a hostmatrix of radioisotope atoms,” 29th International Conference on Low Temperature Physics (LT29), Sapporo, Japan & Online (Hybrid),
August 18–24, 2022.
S. Go (invited), “Overview of RIBF” and “Spectroscopy of exotic nuclei,” The 21st CNS International Summer School (A3F-CNSSS22),
Kumagaya, Saitama, August 20–24, 2022.

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R. Mitsuyasu (poster) et al., “Spectral optimization of laser for excitation of Rb atoms in superﬂuid helium in accelerator experiments,”
The 25th Congress of the International Commission for Optics (ICO), Dresden, Germany & Online (Hybrid), September 5–9, 2022.
S. Akimoto (poster) et al., “Development of an eﬃcient ﬂuorescence detection system for radioisotope atoms generated at accelerators,”
The 25th Congress of the International Commission for Optics (ICO), Dresden, Germany & Online (Hybrid), September 5–9, 2022.
A. Takamine (invited), M. Rosenbusch, M. Wada, S. Iimura, D. Hou, W. Xian, S. Chen, S. Yan, H. Ishiyama, T. Niwase, S. Kimura,
Y. Hirayama, Y. Ito, T. Kojima, J. Lee, S. Michimasa, H. Miyatake, J. Y. Moon, M. Mukai, S. Naimi, T. Sonoda, P. Vi, J. M. Yap,
T. T. Yeung, and H. Wollnik, “Nuclear mass measurements with the new MRTOF-MS system at the ZeroDegree spectrometer of
BigRIPS,” 28th International Nuclear Physics Conference (INPC 2022), Cape Town, South Africa, September 11–16, 2022.
S. Go (oral), “High-spin states in 35 S: the promotion of isoscalar pair at high spin,” 28th International Nuclear Physics Conference(INPC 2022), Cape Town, South Africa, September 11–16, 2022.
A. Takamine (oral), “Development of the new helium gas catcher and nuclear mass measurements with the new MRTOF-MS behind the
ZeroDegree spectrometer at RIKEN BigRIPS,” The 19th International Conference on Electromagnetic Isotope Separators and Related
Topics (EMIS 2022), Daejeon, Korea, October 3–7, 2022.
M. Tajima (poster), A. Takamine, H. Iimura, M. Wada, S. Kimura, T. Niwase, P. Schury, A. Schuessler, J. Lassen, and H. Ueno, “Oﬄine
development for collinear laser spectroscopy at the SLOWRI facility,” The 19th International Conference on Electromagnetic Isotope
Separators and Related Topics (EMIS 2022), Daejeon, Korea, October 3–7, 2022.
A. Gladkov (poster), Y. Ishibashi, H. Yamazaki, Y. Ichikawa, A. Takamine, H. Nishibata, K. Asahi, T. Sato, T. Abe, M. Tajima, S. Go,
A. Ozawa, N. Shimizu, T. Fujita, L. C. Tao, T. Egami, D. Tominaga, T. Kawaguchi, M. Sanjo, W. Kobayashi, K. Imamura, Y. Nakamura,
G. Georgiev, J. M. Daugas, and H. Ueno, “β-NMR measurements of neutron-rich isotopes for nuclear structure and materials science,”
The 19th International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS 2022), Daejeon, Korea, October
3–7, 2022.
P. Schury (oral), D. Kaji, M. Wada, T. Niwase, S. Kimura, H. Koura, H. Miyatake, H. Ishiyama, K. Morimoto, M. Rosenbusch,
A. Takamine, Y. Hirayama, Y. Ito, Y. X. Watanabe, P. Brionnet, and H. Wollnik, “Multi-reﬂection time-of-ﬂight mass spectroscopyof superheavy nuclides,” The 19th International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS 2022),
Daejeon, Korea, October 3–7, 2022.
J. Y. Moon (poster), M. Wada, P. Schury, T. Hashimoto, Y. X. Watanabe, Y. Hirayama, M. Rosenbusch, Y. Ito, S. Iimura, J. Lee,
S. Kimura, Z. Korkulu, H. Miyatake, T. Niwase, A. Takamine, and H. Wollnik, “Construction of the Multi-reﬂection time-of-ﬂight
mass spectrograph (MRTOF-MS) at RAON,” The 19th International Conference on Electromagnetic Isotope Separators and Related
Topics (EMIS 2022), Daejeon, Korea, October 3–7, 2022.
M. Mukai (oral), “Laser ionization spectroscopy of neutron-rich Ir isotopes and recent works at KISS,” Workshop on Laser Spectroscopy/Analysis of Radioactive Isotope and Related Topics, Nagoya, Japan, October 20, 2022.
M. A. Syakuur (poster), A. R. Noviyanti, U. Widyaiswari, T. Saragi, Risdiana, and I. Watanabe, “Sample synthesis of a single phase
Nd2 Ru2 O7 ,” Asia-Paciﬁc Conference on Condensed Matter Physics 2022 (AC2MP2022), Sendai, Japan & Online (Hybrid), November 21–23, 2022.
M. A. Syakuur (poster), A. R. Noviyanti, A. R. Noviyanti, U. Widyaiswari, T. Saragi, Risdiana, D. P. Sari, H. Sakai, N. Hanasaki, andI. Watanabe, “Sample synthesis of a single phase Nd2 Ru2 O7 ,” The 6th International Conference on Functional Materials Science 2022
(ICFMS 2022), Bali, Indonesia & Online (Hybrid), November 29–30, 2022.
T. Otsuka (invited), “Emerging of alpha clustering due to nuclear forces,” Mean-ﬁeld and Cluster Dynamics in Nuclear Systems 2022
(MCD2022) First Week, Kyoto, Japan & Online (Hybrid), May 9–13, 2022.
T. Otsuka (invited), “Alpha clustering from ﬁrst principles for Be and C isotopes including the Hoyle state,” 8th Workshop on Level
Density and Gamma Strength, Oslo, Norway, May 9–13, 2022.
T. Otsuka (oral), “New facets of alpha-clustering and deformation towards driplines depicted by nuclear forces,” Mean-ﬁeld and Cluster
Dynamics in Nuclear Systems 2022 (MCD2022) Third Week, Kyoto, Japan & Online (Hybrid), May 23–27, 2022.
T. Otsuka (invited), “Emerging concepts in nuclear structure based on the shell model,” Symposium “Frontiers in Nuclear Structure
Theory” on the Occasion of the 90th Birthday of Prof. Jan Blomquist, Online, May 23–25, 2022.
T. Otsuka (invited), “Prevailing triaxiality of heavy deformed nuclei,” Shapes and Symmetries in Nuclei: from Experiment to Theory(SSNET’22), Paris, France, May 30–June 3, 2022.
T. Otsuka (invited), “Structure evolutions towards neutron driplines,” Mean-ﬁeld and Cluster Dynamics in Nuclear Systems 2022
(MCD2022) Fifth Week, Kyoto, Japan, June 6–10, 2022.
T. Otsuka (invited), “Monopole-quadrupole interplay in nuclear structure and resulting self-organization phenomena,” Mean-ﬁeld andCluster Dynamics in Nuclear Systems 2022 (MCD2022) Sixth Week, Kyoto, Japan & Online (Hybrid), June 13–17, 2022.
T. Otsuka (oral), “What locates neutron driplines?” Direct Reactions with Exotic Beams 2022 (DREB2022), Santiago de Compostela,
Spain, June 27–July 1, 2022.
T. Otsuka (invited), “Prevailing triaxiality in nuclear shapes,” 55th Zakopane Conference on Nuclear Physics, Zakopane, Poland, August
29–September 2, 2022.
T. Otsuka (invited), “Shell evolution and emerging paradigm changes,” 28th International Nuclear Physics Conference (INPC 2022), CapeTown, South Africa, September 11–16, 2022.
T. Otsuka (invited), “Prevailing triaxiality in heavy deformed nuclei and possible experimental observation by M1 excitation,” SFB 1245
Annual Workshop, Darmstadt, Germany, October 4–7, 2022.
T. Otsuka (invited), “Knocking out nucleons and alphas to see novel nuclear structures,” REIMEI Workshop “Unveiling Nuclear Shells
and Correlations in Exotic Nuclei through Knockout Reactions,” Darmstadt, Germany, October 10–12, 2022.

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RIKEN Accel. Prog. Rep. 56 (2023)

T. Otsuka (invited), “(A) Triaxial ellipsoids probed by the RHC and a possible paradigm change in nuclear structure (B) Progress report on96
Zr and 96 Ru,” EMMI Rapid Reaction Task Force (RRTF) “Nuclear physics Confronts Relativistic Collisions of Isobars,” Heidelberg,
Germany, October 12–14, 2022.
T. Otsuka (invited), “Prevailing triaxiality driven by the tensor force,” The 6th Topical Workshop on Modern Aspects in Nuclear Structure(BORMIO-2023), Bormio, Italy, February 6–11, 2022.
T. Otsuka (invited), “New aspects of nuclear structure (Impacts from modern Shell Model),” INTPART School 2023, Okinawa, Japan,
February 20–March 3, 2023.

[Domestic Conferences/Workshops]

今村慧 (依頼講演), 「RI 原子線共鳴装置の開発:イオントラップ部」, 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
たな応用の架け橋. 」領域研究会 (第 4 回領域全体会議), オンライン, 2022 年 5 月 20–21 日.
上野秀樹 (依頼講演), 「計画研究 B03 班 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. 新たな応用の架け橋. 」領域研究会 (第 4 回領域全体会議), オンライン, 2022 年 5 月 20–21 日.
光安陸大, 高峰愛子, 今村慧, 秋元彩, 伊藤愛美, 螺良健太, 菊地快, 上野秀樹, 松尾由賀利, 「加速器実験における超流動ヘリウム中
Rb 原子励起用レーザーのスペクトル最適化」, 第 18 回原子・分子・光科学 (AMO) 討論会, 東京 (東京大学本郷キャンパス) & オ
ンライン ハイブリッド開催, 2022 年 6 月 10–11 日.
菊地快, 今村慧, 高峰愛子, 螺良健太, 秋元彩, 伊藤愛美, 光安陸大, A. Gladkov, 田島美典, 郷慎太郎, 向井もも, 遠藤宏紀, 長谷正司,
川田敬太, 西畑洸希, 市川雄一, 北川敦志, 涌井崇志, 上野秀樹, 松尾由賀利, 「超流動ヘリウム中レーザー分光のための不安定核
原子 84 Rb の停止位置最適化」, 第 18 回原子・分子・光科学 (AMO) 討論会, 東京 (東京大学本郷キャンパス) & オンライン ハイ
ブリッド開催, 2022 年 6 月 10–11 日.
遠藤宏紀, 石井邦彦, 今村慧, 高峰愛子, 竹内由衣花, 田原太平, 上野秀樹, 松尾由賀利, 「超流動ヘリウム中 Rb 原子バブル緩和時間測定に向けたスペクトル解析」, 第 18 回原子・分子・光科学 (AMO) 討論会, 東京 (東京大学本郷キャンパス) & オンライン ハイ
ブリッド開催, 2022 年 6 月 10–11 日.
大塚孝治, 「炭素 12 の第一原理計算とホイル状態」, RCNP 研究会「原子核反応研究の最近の話題と展望」 河合光路先生を偲ぶ会,
大阪府茨木 (大阪大学吹田キャンパス), 2022 年 7 月 8–9 日.
水野るり惠, 池田時浩, 郷慎太郎, 櫻井博儀, 齋藤岳志, 新倉潤, 松崎禎市郎, 道正新一郎, 「1 MeV 陽子ビームを用いた広ダイナミッ
クレンジ光子検出器の性能評価実験」, 第 34 回タンデム加速器及びその周辺技術の研究会, オンライン, 2022 年 7 月 21–22 日.
安藤蒼太, 市川雄一, 佐藤智哉, 篠原雄介, 西畑洸希, 岸本侃己, 山下渉, 横田望海, 立川柊平, 竹中京平, 梶原孝文, 荒殿和希, 郷慎太郎,
高峰愛子, 上野秀樹, 旭耕一郎, 「EDM 測定に向けたガラスセル中 Xe 原子のスピン緩和機構の評価 II」, 日本物理学会 2022 年
秋季大会, 岡山市 (岡山理科大学岡山キャンパス), 2022 年 9 月 6–8 日.
篠原悠介, 市川雄一, 郷慎太郎, 西畑洸希, 安藤蒼太, 荒殿和希, 旭耕一郎, 馬場秀忠, 福田直樹, G. Georgiev, A. Gladkov, 今村慧,梶原孝文, 岸本侃己, R. Lozeva, 向井もも, 新倉潤, M. N. Nurhaﬁza, 小田原厚子, 清水陽平, M. Si, K. Stoychev, 鈴木宏, 立川柊平,
田島美典, 高峰愛子, 竹田浩之, 竹中京平, 武重祥子, 上野秀樹, 若狭智嗣, 山下渉, 山崎展樹, 横田望海, 吉本雅浩, J. -M. Daugas,「分散整合二回散乱法による 99 Zr アイソマー状態のスピン整列」, 日本物理学会 2022 年秋季大会, 岡山市 (岡山理科大学岡山キャンパス), 2022 年 9 月 6–8 日.
向井もも, 平山賀一, 渡邉裕, P. Schury, S. C. Jeong, 宮武宇也, 庭瀬暁隆, 小柳津充宏, M. Rosenbusch, 上野秀樹, 和田道治, 「MRTOFと組み合わせた崩壊核分光のための飛行時間検出器の開発」, 日本物理学会 2022 年秋季大会, 岡山市 (岡山理科大学岡山キャンパス), 2022 年 9 月 6–8 日.
飯村俊, M. Rosenbusch, 高峰愛子, 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, 平山賀一, 宮武宇也, S. Naimi, 道正新一郎, 西村俊二, 小田原厚子, 石山博恒, 角田佑介, 清水則孝,
大塚孝治, 「理研 BigRIPS SLOWRI における ZD-MRTOF 装置を用いた中性子過剰 Sc, Ti, V 核の系統的核構造研究」, 日本
物理学会 2022 年秋季大会, 岡山市 (岡山理科大学岡山キャンパス), 2022 年 9 月 6–8 日.
鈴木大介, 小山俊平, Assié, M., L. Lalanne, O. Sorlin, 阿部喬, D. Beaumel, Y. Blumenfeld, L. Caceres, de Oliveira F. Santos,
F. Delaunay, F. Flavigny, S. Franchoo, J. Gibelin, Girard-V. Alcindor, J. Guillot, F. Hammache, O. Kamalou, A. Kamenyero,
北村徳隆, V. Lapoux, A. Lemasson, A. Matta, B. Mauss, P. Morfouace, 新倉潤, 大津秀暁, J. Pancin, T. Roger, 齋藤岳志, 櫻井博儀,
C. Stodel, and J. -C. Thomas, 「非束縛核 8 C におけるミラー対称性の研究」, 日本物理学会 2022 年秋季大会, 岡山市 (岡山理科大学岡山キャンパス), 2022 年 9 月 6–8 日.
平山賀一, 向井もも, 渡辺裕, P. Schury, S. C. Jeong, 庭瀬暁隆, 小柳津充広, M. Rosenbusch, 谷口秋洋, 宮武宇也, 和田道治, 「KISS での低温ヘリウムガスセル開発」, 日本物理学会 2022 年秋季大会, 岡山市 (岡山理科大学岡山キャンパス), 2022 年 9 月 6–8 日.
庭瀬暁隆, 渡辺裕, 平山賀一, 向井もも, P. Schury, N. Andreyev, 飯村俊, 石山博恒, S. C. Jeong, 宮武宇也, M. Rosenbusch, 谷口秋洋,
和田道治, 「精密質量測定による新同位体 241 U の発見」
, 日本物理学会 2022 年秋季大会, 岡山市 (岡山理科大学岡山キャンパス),
2022 年 9 月 6–8 日.
洲嵜ふみ, 西尾勝久, A. N. Andreyev, 廣瀬健太郎, R. Orlandi, 牧井宏之, J. Smallcombe, 伊藤由太, 浅井雅人, 塚田和明, 佐藤哲也,
小川達彦, 宮武宇也, 渡邉裕, 平山賀一, S. C. Jeong, 向井もも, 庭瀬暁隆, 久保野茂, 岩佐直仁, 「JAEA 反跳生成核分離装置を用いた多核子移行反応の研究」, 日本物理学会 2022 年秋季大会, 岡山市 (岡山理科大学岡山キャンパス), 2022 年 9 月 6–8 日.
角田佑介, 清水則孝, 大塚孝治, 「モンテカルロ殻模型による N = 50 近傍の核構造の研究」, 日本物理学会 2022 年秋季大会, 岡山市(岡山理科大学岡山キャンパス), 2022 年 9 月 6–8 日.
阿部喬 (基調講演), 「富岳で探る炭素 12 のホイル状態」, 富岳で加速する素粒子・原子核・宇宙・惑星シンポジウム, 神戸大学先端融合研究環統合研究拠点 & オンライン ハイブリッド開催, 2022 年 12 月 12–13 日.
阿部喬, 「モンテカルロ殻模型による第一原理計算の最近の進展」, 富岳で加速する素粒子・原子核・宇宙・惑星シンポジウム, オ
ンライン, 2022 年 1 月 17–18 日
小澤直也, 長濱弘季, 中村圭佑, 佐藤幹, 中下輝士, 永瀬慎太郎, 上原大祐, 深瀬実来, 青木貴稔, 山口敦史, 高峰愛子, 上野秀樹,- 257 -

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酒見泰寛, 「永久電気双極子能率探索を目指した冷却フランシウム原子源の開発」, 日本物理学会 2023 年春季大会, オンラ
イン, 2023 年 3 月 22–25 日.
深瀬実来, 長濱弘季, 中村圭佑, 小澤直也, 佐藤幹, 中下輝士, 永瀬慎太郎, 上原大祐, 高峰愛子, 上野秀樹, 酒見泰寛, 「フランシウ
ム原子の永久電気双極子能率探索に向けた高周波二重極質量フィルターの開発」, 日本物理学会 2023 年春季大会, オンライン,
2023 年 3 月 22–25 日.
上原大祐, 長濱弘季, 中村圭佑, 佐藤幹, 中下輝士, 小澤直也, 永瀬慎太郎, 深瀬実来, 青木貴稔, 山口敦史, 高峰愛子, 上野秀樹,
酒見泰寛, 「レーザー冷却フランシウム源実現に向けた金属表面における中性脱離反応の研究」, 日本物理学会 2023 年春季大会, オンライン, 2023 年 3 月 22–25 日.
立川柊平, 市川雄一, 佐藤智哉, 安藤蒼太, 篠原悠介, 谷本昂平, 山本陽介, 西畑洸希, 若狭智嗣, 岸本侃己, 山下渉, 横田望海, 竹中京平,
梶原孝文, 荒殿和希, 郷慎太郎, 高峰愛子, 上野秀樹, 旭耕一郎, 「EDM 測定に向けた能動帰還型核スピンメーザーの開発」, 日本
物理学会 2023 年春季大会, オンライン, 2023 年 3 月 22–25 日.
今村慧, 高峰愛子, 福澤悠亮, A. Gladkov, 郷慎太郎, 田島美典, 上野秀樹, 「原子ビーム共鳴法を利用したスピン偏極 RI 原子ビーム生成に向けた中性化装置開発」, 日本物理学会 2023 年春季大会, オンライン, 2023 年 3 月 22–25 日.
菊地快, 今村慧, 高峰愛子, 螺良健太, 秋元彩, 伊藤愛美, 光安陸大, A. Gladkov, 田島美典, 郷慎太郎, 向井もも, 遠藤宏紀, 長谷正司,
川田敬太, 西畑洸希, 市川雄一, 北川敦志, 涌井崇志, 上野秀樹, 松尾由賀利, 「レーザー誘起蛍光観測による超流動ヘリウム中不安定核原子 84 Rb の停止位置最適化」, 日本物理学会 2023 年春季大会, オンライン, 2023 年 3 月 22–25 日.
光安陸大, 高峰愛子, 今村慧, 秋元彩, 伊藤愛美, 螺良健太, 菊地快, 上野秀樹, 松尾由賀利, 「HIMAC における超流動ヘリウム中不安定核原子 84 Rb の蛍光検出高感度化の試み」, 日本物理学会 2023 年春季大会, オンライン, 2023 年 3 月 22–25 日.
向井もも, 平山賀一, 渡邉裕, P. Schury, S. C. Jeong, 宮武宇也, 庭瀬暁隆, M. Rosenbusch, 上野秀樹, 和田道治, 「安定イリジウム同位, 日本物理学会 2023 年春季大会, オンライン, 2023 年 3 月 22–25 日.
体周辺核の直接質量測定」
田島美典, 黒田直史, 桧垣浩之, 松田恭幸 (ASACUSA-CUSP Collaboration), 「反陽子蓄積リング施設 ELENA における反陽子トラップ」, 日本物理学会 2023 年春季大会, オンライン, 2023 年 3 月 22–25 日.
阿部喬, 「第一原理計算によるホイル状態のクラスター構造」, 日本物理学会 2023 年春季大会, オンライン, 2023 年 3 月 22–25 日.
角田佑介, 清水則孝, 大塚孝治, 「モンテカルロ殻模型による N = 50 近傍の核構造の研究」, 日本物理学会 2023 年春季大会, オンラ
イン, 2023 年 3 月 22–25 日.
高峰愛子, 「原子物理分光技術で覗く原子核の世界」, 第 30 回原子衝突セミナー, オンライン, 2022 年 3 月 30–31 日.

Award
K. Kikuchi (Hosei Univ.), “Optimization of the stopping position of a highly energetic 84 Rb atoms injected into superﬂuid helium,” Poster
Award of the 29th International Conference on Low Temperature Physics (LT29), August 23, 2022.

Press Releases

プレスリリース: 「スーパーコンピュータ『富岳』で探る炭素の起源―第一原理計算で導かれたアルファクラスターの構造」, 理研, 東京大学, 日本原子力研究開発機構共同プレスリリース, 2022 年 4 月 27 日.
新聞掲載: 「理研, C12 原子核の量子構造解明 炭素起源理解に期待」, 日刊工業新聞, 2022 年 4 月 28 日.

Outreach Activities

アウトリーチ: 高峰愛子 (理研), インタビュー記事 Web 掲載 (高校・大学生向けイベント) 「見たい! 知りたい! 原子核サイエンス最前線仁科加速器科学研究センター応援団」, 2022 年 7 月 1 日.
理研広報誌掲載: 「炭素はどのようにしてつくられたのか」, 理研クローズアップ科学道 2022 (理研, 2022 年 9 月 12 日).
理研広報誌掲載: “Calculations reveal three helium nuclei lurking inside carbon nuclei,” RIKEN Research (RIKEN, Winter 2022 issue),p. 14.

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