VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 55 (2022)

Nuclear Science and Transmutation Research Division
Radioactive Isotope Physics Laboratory
1. Abstract
This Laboratory works as one of core research groups conducting programs at the world-premiere heavy-ion accelerator facilityof RIKEN “RI Beam Factory (RIBF).” The Laboratory explores exotic nuclear structures and dynamics in exotic nuclei that havenever been investigated before, such as those with largely imbalanced proton and neutron numbers. Our aim is to develop new
experimental techniques utilizing fast radioactive isotope (RI) beams at RIBF, to discover new phenomena and properties in exotic
nuclei. The Laboratory is focusing three major subjects; shell evolution of very neutron-rich nuclei, the r-process path and equationof-state in asymmetric nuclear matter. The Laboratory has initiated international collaborations for in-beam gamma spectroscopy,
decay spectroscopy and heavy-ion induced reactions, and has formed a discussion forum for next generation gamma-ray detectors.

2. Major Research Subjects(1) Study of structure and dynamics of exotic nuclei through developments of new tools in terms of reaction- and technique-based
methodology(2) Research on EOS in asymmetric nuclear matter via heavy-ion induced reactions(3) Detector developments for spectroscopy and reaction studies

3. Summary of Research Activity(1) In-beam gamma spectroscopy
In the medium and heavy mass region explored at RIBF, collective natures of nuclei are one of important subjects, which are
obtained through production and observation of high excited and high spin states. To populate such states, heavy-ion induced reactions
such as fragmentation, ﬁssion are useful. So far, we have developed two-step fragmentation method as an eﬃcient method to identify
and populate excited states, and lifetime measurements to deduce transition strength.
Devices utilized for the in-beam gamma spectroscopy are ZeroDegree Spectrometer (ZDS) and a NaI array DALI2. Since the endof 2008, the ﬁrst spectroscopy on nuclei island-of-inversion region was performed, we have explored step-by-step new and unknown
regions in the nuclear chart. The second campaign in 2009 was organized to study background components originating from atomic
processes in a heavy target. Neutron-rich nuclei at N = 20 to 28 were studied in 2010. In 2011–2013, we conducted experiment
programs for Ca-54, Ni-78, neutron-rich nuclei at N = 82 and neutron-deﬁcient nuclei at Z = 50.
A multitude of data obtained with inelastic, nucleon knock-out, fragmentation channels have been analyzed and published. In
2011–2013, collective natures of Mg-36, 38 and Si-42 were both published in PRL. Excited states ﬁrstly observed in Ca-54 werereported in Nature to demonstrate a new nuclear magic number of 34. Fragmentation reaction has been found eﬃcient for nuclei
with A > 100 and low-lying excited state in Pd-126 has been successfully observed and reported in PRC. In 2019, results of the ﬁrst
spectrosocpy of 40 Mg was published in PRL, to demonstrate the exotic structure which is very diﬀerent from in other neutron-rich Mg
isotopes.
To further strengthen the in-beam gamma spectroscopy at RIBF, we have proposed a new setup of MINOS + DALI2 to search
for the 1st excited states in even-even neutron-rich nuclei with Z ∼ 20 to 40. The program was submitted to the PAC 2013 as a
new category of proposal, “proposal for scientiﬁc program” and was S-ranked. A dedicated collaboration “SEASTAR” has been
established as a subset of in-beam gamma collaboration “SUNFLOWER.” The three campaigns were organized in 2014, 2015 and2017 to study very neutron-rich isotopes, and were very productive to access very neutron-rich nuclei such as Ar-52, Ca-56, Ni-78,
Kr-100, Zr-110. In 2019, the result of the ﬁrst spectroscopy of Ni-78 was published in Nature.
A new project of high resolution gamma spectroscopy with fast beams “HiCARI” has been proposed at PAC 2018. MINIBALL
and several Ge tracking detectors from Japan, Europe, the USA and Korea are being combined to form an array of germanium
detectors. The new setup aims to accelerate researches of the nuclear structure by observing gamma-lines in even-odd nuclei andmeasuring lifetimes of excited states. The two workshops were organized in 2019, and the machine time of 43.5 days in total wasapproved at PAC 2019. A part of the HiCARI programs was successfully conducted in 2020 and 2021.
Concerning a next generation detector, a discussion forum has been established to write up a white paper on tracking germanium
detectors and high-eﬃcient crystal detectors such LaBr3 and GAGG.
(2) Decay spectroscopy
Beta- and isomer-spectroscopy is an eﬃcient method for studying nuclear structure, especially for non-yrast levels. We had
accumulated experimental techniques at the RIPS facility to investigate nuclear structure in light mass region via beta-gamma andbeta-p coincidence. Concerning the medium and heavy mass region available at RIBF, we have developed two position-sensitive
active-stoppers, strip-silicon detectors and a cylindrical active stopper called CAITEN, to achieve a low-background measurement by
taking correlation between heavy ion stop position and beta-ray emission position. A site of decay-spectroscopy at the new facility of
RIBF is the ﬁnal focal plane of ZDS, where high precision of TOF in particle identiﬁcation is obtained due to a long ﬂight path fromBigRIPS to ZDS.
At the end of 2009, the ﬁrst decay spectroscopy was organized with a minimum setup of four clover gamma detectors and silicon
strip detectors, to study neutron-rich nuclei with A ∼ 110. The ﬁrst campaign was found successful and eﬃcient to publish four
letter articles in 2011, two PRL’s and two PLB’s. One of the PRL papers is associated to the r-process path where half-lives for 18- 205 -

VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 55 (2022)

neutron-rich nuclei were determined for the ﬁrst time. The other PRL paper reported a ﬁnding of deformed magic number 64 in the
Zr isotopes.
The success of the ﬁrst decay-spectroscopy campaign stimulated to form a new large-scale collaboration “EURICA,” where a
twelve Euroball cluster array is coupled with the silicon-strip detectors to enhance gamma eﬃciency by a factor of 10. A construction
proposal of “EURICA” was approved in the PAC 2011, and the commissioning was successfully organized in spring 2012. Since
then, physics runs had been conducted for programs approved to survey nuclei of interest as many as possible, such as Ni-78, Pd-128,
Sn-100. The EURICA collaboration ﬁnished its physics programs in summer 2016. So far, 54 papers including 14 PRL’s and 13
PLB’s were published. One of the highlights is discovery of a seniority isomer in Pd-128, of which cascade gamma decay gives theenergy of ﬁrst excited state and robustness of N = 82 magic number, and the other is a half-life measurement for 110 neutron-richnuclei across the N = 82 shell gap, which shows implications for the mechanism and universality of the r-process path.
Beta-delayed neutron emission probability of medium and heavy neutron-rich nuclei is important to understand nuclear structure
and the r-process path. In 2013, a new collaboration “BRIKEN” has been established to form a He-3 detector array. A present
design of the array has neutron eﬃciency as high as 70% up to 3 MeV. The array was coupled with the AIDA silicon strip system. A
construction proposal was approved at the PAC 2013 and three physics proposals have been approved. The commissioning run was
conducted in autumn 2016. The major physics runs were conducted in 2017–2021.
A new project “IDATEN” has been launched in 2021 to measure lifetime of excited states with a large size LaBr3 array, which
is formed by combination of FATIMA and Khala arrays. The construction proposal was submitted to PAC, 2021, and proposals with
IDATEN will be evaluated at PAC, 2022.
The CAITEN detector was successfully tested with fragments produced with a Ca-48 beam in 2010.
(3) Equation-of-state via heavy-ion central collisions
Equation-of-state in asymmetric nuclear matter is one of major subjects in physics of exotic nuclei. Pi-plus and pi-minus yields
in central heavy ion collisions at the RIBF energy are considered as one of EOS sensitive observables at the RIBF energy. To observecharged pions, a TPC for the SAMURAI spectrometer is being constructed under an international collaboration “SπRIT,” Construction
proposal was submitted at the PAC 2012, and physics proposals were approved at the PAC 2012 and 2013. The physics runs weresuccessfully conducted in spring 2016. The ﬁrst three papers were published in 2020 and 2021. One of them has been ranked as theTOP 1% paper by WoS in 2021.
An international symposium “NuSYM” on nuclear symmetry energy was organized at RIKEN July 2010 to invite researchers
in three sub-ﬁelds, nuclear structure, nuclear reaction and nuclear astrophysics, and to discuss nuclear symmetry energy together.
Since then, the symposium series have been held every year and been useful to encourage theoretical works and to strengthen thecollaboration.
(4) Nucleon correlation and cluster in nuclei
Nucleon correlation and cluster in nuclei are matters of central focus in a “beyond mean-ﬁeld” picture. The relevant programswith in-beam gamma and missing-mass techniques are to depict nucleon condensations and correlations in nuclear media as a functionof density as well as temperature. Neutron-halo and -skin nuclei are objects to study dilute neutron matter at the surface. By changing
excitation energies in neutron-rich nuclei, clustering phenomena and role of neutrons are to be investigated.
In 2013, two programs were conducted at the SAMURAI spectrometer. One is related to proton-neutron correlation in the C-12
nucleus via p-n knockout reaction with a carbon target. The other is to search for a cluster state in C-16, which was populated via
inelastic alpha scattering. The data is being analyzed.
In 2018, a new project based on missing mass spectroscopy was launched to investigate an exotic cluster state in a very protonrich nucleus. The experiment was organized at GANIL with combination of RIKEN liquid hydrogen target CRYPTA and the MUST2
detector array in 2018.

Members
Director
Hiroyoshi SAKURAI
Research/Technical Scientists
Pieter Christiaan DOORNENBAL (Senior Research Scientist)
Tadaaki ISOBE (Senior Research Scientist)
Akihisa KOHAMA (Senior Research Scientist)

Yoichi NAKAI (Senior Research Scientist)
Shunji NISHIMURA (Senior Research Scientist)
Daisuke SUZUKI (Research Scientist)

Contract Researcher
Nobuya NISHIMURA
Special Postdoctoral ResearchersFrank BROWNE

Masaomi TANAKA- 206 -

VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 55 (2022)

Postdoctoral Researchers
Phong VI

Zuxing YANG

Junior Research Associate
Takuma KOIWAI (Univ. of Tokyo)
International Program Associate
Jinn Ming YAP (Univ. of Hong Kong)
Special Temporary Research Scientist
Takashi ICHIHARA
Research Consultants
Masayasu ISHIHARA
Kenichi MATSUYANAGI

Hiroyuki MURAKAMI

Senior Visiting Scientists
Koichiro ASAHI (Tokyo Tech)
Shigeru KUBONO (Univ. of Tokyo)

Tetsuya MURAKAMI

Visiting Scientists
Nori AOI (Osaka Univ.)Frank BROWNE (CERN)
Hue BUI (Vietnam Academy of Sci. and Tech.)
Giordano CERIZZA (Michigan State Univ.)
Silvio CHERUBINI (Univ. of Catania)
Martha Liliana CORTES SUA (TU Darmstadt)
Mitsunori FUKUDA (Osaka Univ.)
Byungsik HONG (Korea Univ.)
Kei IIDA (Kochi Univ.)
Natsumi IKENO (Tottori Univ.)
Takuji IZUMIKAWA (Niigata Univ.)
Takashi KISHIDA (Aoyama Gakuin Univ.)
Gabor KISS (ATOMKI)
Khiem LE (Vietnam Academy of Sci. and Tech.)
Giuseppe LORUSSO (Nat’l Phys. Lab.)
Byul MOON (IBS)
Yoshiharu MORI (Kyoto Univ.)

Megumi NIIKURA (Univ. of Tokyo)
Evgueni NIKOLSKI (Kurchatov Inst.)
Daiki NISHIMURA (Tokyo City Univ.)
Takashi OHTSUBO (Niigata Univ.)
Akira ONO (Tohoku Univ.)
Naohiko OTSUKA (IAEA)
Kazuhiro OYAMATSU (Aichi Shukutoku Univ.)
Clementine Angelique Marie-Th SANTAMARIA (Berkeley
Lab)
Paer-Anders SOEDERSTROEM (IFIN-HH)
Ryo TANIUCHI (Univ. of York)Rensheng WANG (Soochow Univ.)
Hiroshi WATANABE (Beihang Univ.)
Kathrin WIMMER (GSI)
Jin WU (Argonne Nat’l Lab.)
Yasutaka YAMAMOTO (Osaka Univ.)

Visiting Technicians
Hilde DE WITTE (KU Leuven)

Herbert E. HESS (Univ. of Cologne)

Student Trainees
Takamichi AOKI (Univ. of Tokyo)
Linh BUI (Vietnam Atomic Energy Inst.)
Richard CRANE (Univ. of York)Miki FUKUTOME (Osaka Univ.)
Yumo INADA (Univ. of Tokyo))
Satoko IWAZAKI (Osaka Univ.)
Jiseok KIM (Korea Univ.)
Asahi KOHDA (Osaka Univ.)
Takuma KOIWAI (Univ. of Tokyo)
Kei KOKUBUN (Univ. of Tokyo)
Haruo KONDO (Univ. of Tokyo)
Jung Woo LEE (Korea Univ.)
Rurie MIZUNO (Univ. of Tokyo)

Nurhaﬁza MOHAMAD NOR (Osaka Univ.)
Norihide NOGUCHI (Niigata Univ.)
Thomas PARRY (Univ. of Surrey)
Takeshi SAITO (Univ. of Tokyo)
Sora SUGAWARA (Tokyo City Univ.)
Ryo TAGUCHI (Osaka Univ.)
Hiroyuki TAKAHASHI (Tokyo City Univ.)
Gen TAKAYAMA (Osaka Univ.)
Hidaka TANABE (Tsukuba Univ.)
Chun Yuen TSANG (Michigan State Univ.)
Chiaki UNE (Tokyo City Univ.)
Shu YAMAMURA (Univ. of Tokyo)
Tik Tsun YEUNG (Univ. of Tokyo)

Part-time Workers
Kiyomi ARAI (Research Part-time Worker I)
Mie DOI (Research Part-time Worker I)
Masanori KANEKO (Research Part-time Worker I)
Miki KANOU (Research Part-time Worker I)
Eiko MIZUMOTO (Research Part-time Worker I)

Noriko OKAYASU (Research Part-time Worker I)
Tsuneyo SUZUKI (Research Part-time Worker I)
Mayumi SAITO (Research Part-time Worker II)
Miyuki TAMABAYASHI (Research Part-time Worker II)- 207 -

VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 55 (2022)

List of Publications & Presentations
Publications[Original Papers]
R. -B. Gerst, A. Blazhev, K. Moschner, P. Doornenbal, A. Obertelli, K. Nomura, J. -P. Ebran, S. Hilaire, J. Libert, G. Authelet, H. Baba,
D. Calvet, F. Chateau, S. Chen, A. Corsi, A. Delbart, J. -M. Gheller, A. Giganon, A. Gillibert, V. Lapoux, T. Motobayashi, M. Niikura,
N. Paul, J. -Y. Rousse, H. Sakurai, C. Santamaria, D. Steppenbeck, R. Taniuchi, T. Uesaka, T. Ando, T. Arici, F. Browne, A. M. Bruce,
R. Caroll, L. X. Chung, M. L. Cortes, M. Dewald, B. Ding, F. Flavigny, S. Franchoo, M. Gorska, A. Gottardo, J. Jolie, A. Jungclaus,
J. Lee, M. Lettmann, B. D. Linh, J. Liu, Z. Liu, C. Lizarazo, S. Momiyama, S. Nagamine, N. Nakatsuka, C. R. Nita, C. Nobs, L. Olivier,R. Orlandi, Z. Patel, Zs. Podolyak, M. Rudigier, T. Saito, C. Shand, P. -A. Soderstrom, I. Stefan, V. Vaquero, V. Werner, K. Wimmer,
and Z. Xu, “γ-ray spectroscopy of low-lying yrast and non-yrast states in neutron-rich 94, 95, 96 Kr,” Phys. Rev. C 105, 024302 (2022).
S. Kim, J. Hwang, Y. Satou, N. A. Orr, T. Nakamura, Y. Kondo, J. Gibelin, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, P. Doornenbal, N. Fukuda, N. Inabe, T. Isobe, D. Kameda, D. Kanno, N. Kobayashi, T. Kobayashi, T. Kubo, S. Leblond, J. Lee, F. M. Marques,
R. Minakata, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, H. Otsu,
H. Sato, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, A. G. Tuﬀ, M. Vandebrouck, and
K. -I. Yoneda, “Spectroscopy of 17 C above the neutron separation energy,” Few-Body Syst. 63, 21 (2022).
T. Koiwai, K. Wimmer, P. Doornenbal, A. Obertelli, C. Barbieri, T. Duguet, J. D. Holt, T. Miyagi, P. Navratil, K. Ogata, N. Shimizu,
V. Soma, Y. Utsuno, K. Yoshida, N. L. Achouri, H. Baba, F. Browne, D. Calvet, F. Chateau, S. Chen, N. Chiga, A. Corsi, M. L. Cortes,
A. Delbart, J. -M. Gheller, A. Giganon, A. Gillibert, C. Hilaire, T. Isobe, T. Kobayashi, Y. Kubota, V. Lapoux, H. N. Liu, T. Motobayashi, I. Murray, H. Otsu, V. Panin, N. Paul, W. Rodriguez, H. Sakurai, M. Sasano, D. Steppenbeck, L. Stuhl, Y. L. Sun, Y. Togano,
T. Uesaka, K. Yoneda, O. Aktas, T. Aumann, L. X. Chung, F. Flavigny, S. Franchoo, I. Gasparic, R. -B. Gerst, J. Gibelin, K. I. Hahn,
D. Kim, Y. Kondo, P. Koseoglou, J. Lee, C. Lehr, B. D. Linh, T. Lokotko, M. MacCormick, K. Moschner, T. Nakamura, S. Y. Park,D. Rossi, E. Sahin, P. -A. Soderstrom, D. Sohler, S. Takeuchi, H. Toernqvist, V. Vaquero, V. Wagner, S. Wang, V. Werner, X. Xu,
H. Yamada, D. Yan, Z. Yang, M. Yasuda, and L. Zanetti, “A ﬁrst glimpse at the shell structure beyond 54 Ca: Spectroscopy of 55 K, 55 Ca,
and 57 Ca,” Phys. Lett. B 827, 136953 (2022).
B. Le Crom, M. Assie, Y. Blumenfeld, J. Guillot, H. Sagawa, T. Suzuki, M. Honma, N. L. Achouri, B. Bastin, R. Borcea, W. N. Catford,
E. Clement, L. Caceres, M. Caamano, A. Corsi, G. De France, F. Delaunay, N. De Sereville, B. Fernandez-Dominguez, M. Fisichella,
S. Franchoo, A. Georgiadou, J. Gibelin, A. Gillibert, F. Hammache, O. Kamalou, A. Knapton, V. Lapoux, S. Leblond, A. O. Macchiavelli, F. M. Marques, A. Matta, L. Menager, P. Morfouace, N. A. Orr, J. Pancin, X. Pereira-Lopez, L. Perrot, J. Piot, E. Pollacco, D. Ramos, T. Roger, F. Rotaru, A. M. Sanchez-Benitez, M. Senoville, O. Sorlin, M. Stanoiu, I. Stefan, C. Stodel, D. Suzuki,
J. -C. Thomas, and M. Vandebrouck, “Neutron-proton pairing in the N = Z radioactive fp-shell nuclei 56 Ni and 52 Fe probed by pairtransfer,” Phys. Lett. B 829, 137057 (2022).
W. P. Liu, Z. H. Li, J. J. He, X. D. Tang, G. Lian, J. Su, Y. P. Shen, Z. An, F. Q. Chao, J. J. Chang, L. H. Chen, H. Chen, X. J. Chen,
Y. H. Chen, Z. J. Chen, B. Q. Cui, X. C. Du, X. Fang, C. B. Fu, L. Gan, B. Guo, Z. Y. Han, X. Y. Guo, G. Z. He, J. R. He, A. Heger,
S. Q. Hou, H. X. Huang, N. Huang, B. L. Jia, L. Y. Jiang, S. Kubono, J. M. Li, M. C. Li, K. A. Li, E. T. Li, T. Li, Y. J. Li, M. Lugaro,
X. B. Luo, H. Y. Ma, S. B. Ma, D. M. Mei, W. Nan, W. K. Nan, N. C. Qi, Y. Z. Qian, J. C. Qin, J. Ren, C. S. Shang, L. T. Sun, W. L. Sun,
W. P. Tan, I. Tanihata, S. Wang, P. Wang, Y. B. Wang, Q. Wu, S. W. Xu, S. Q. Yan, L. T. Yang, Y. Yang, X. Q. Yu, Q. Yue, S. Zeng,
L. Zhang, H. Zhang, H. Y. Zhang, L. Y. Zhang, N. T. Zhang, P. Zhang, Q. W. Zhang, T. Zhang, X. P. Zhang, X. Z. Zhang, W. Zhao,
J. F. Zhou, and Y. Zho, “Progress of underground nuclear astrophysics experiment JUNA in China,” Few-Body Syst. 63, 43 (2022).
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 (2022).
A. Vitez-Sveiczer, A. Algora, A. I. Morales, B. Rubio, G. G. Kiss, P. Sarriguren, P. Van Isacker, G. de Angelis, F. Recchia, S. Nishimura,
J. Agramunt, V. Guadilla, A. Montaner-Piza, S. E. A. Orrigo, A. Horvath, D. Napoli, S. Lenzi, A. Boso, V. H. Phong, J. Wu, P. -A. Soderstrom, T. Sumikama, H. Suzuki, H. Takeda, D. S. Ahn, H. Baba, P. Doornebal, N. Fukuda, N. Inabe, T. Isobe, T. Kubo, S. Kubono,
H. Sakurai, Y. Shimizu, C. Sidong, B. Blank, P. Ascher, M. Gerbaux, T. Goigoux, J. Giovinazzo, S. Grevy, T. Kurtukian Nieto, C. Magron, W. Gelletly, Zs. Dombradi, Y. Fujita, M. Tanaka, P. Aguilera, F. Molina, J. Eberth, F. Diel, D. Lubos, C. Borcea, E. Ganioglu,
D. Nishimura, H. Oikawa, Y. Takei, S. Yagi, W. Korten, G. de France, P. Davies, J. Liu, J. Lee, T. Lokotko, I. Kojouharov, N. Kurz,
H. Shaﬀner, and A. Petrovici, “The β-decay of 70 Kr into 70 Br: Restoration of the pseudo-SU(4) symmetry,” Phys. Lett. B 830, 137123(2022).
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. Soderstrom, 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 (2022).
D. Bazin, N. Aoi, H. Baba, J. Chen, H. Crawford, P. Doornenbal, P. Fallon, K. Li, J. Lee, M. Matsushita, T. Motobayashi, H. Sakurai,
H. Scheit, D. Steppenbeck, R. Stroberg, S. Takeuchi, H. Wang, K. Yoneda, and C. X. Yuan, “Spectroscopy of 33 Mg with knockout
reactions,” Phys. Rev. C 103, 064318 (2021).

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F. Browne, S. Chen, P. Doornenbal, A. Obertelli, K. Ogata, Y. Utsuno, K. Yoshida, N. L. Achouri, H. Baba, D. Calvet, F. Chateau,
N. Chiga, A. Corsi, M. L. Cortes, A. Delbart, J. -M. Gheller, A. Giganon, A. Gillibert, C. Hilaire, T. Isobe, T. Kobayashi, Y. Kubota,
V. Lapoux, H. N. Liu, T. Motobayashi, I. Murray, H. Otsu, V. Panin, N. Paul, W. Rodriguez, H. Sakurai, M. Sasano, D. Steppenbeck,L. Stuhl, Y. L. Sun, Y. Togano, T. Uesaka, K. Wimmer, K. Yoneda, O. Aktas, T. Aumann, K. Boretzky, C. Caesar, L. X. Chung,F. Flavigny, S. Franchoo, I. Gasparic, R. -B. Gerst, J. Gibelin, K. I. Hahn, M. Holl, J. Kahlbow, D. Kim, D. Korper, T. Koiwai,
Y. Kondo, P. Koseoglou, J. Lee, C. Lehr, B. D. Linh, T. Lokotko, M. MacCormick, K. Miki, K. Moschner, T. Nakamura, S. Y. Park,D. Rossi, E. Sahin, F. Schindler, H. Simon, P. -A. Soderstrom, D. Sohler, S. Takeuchi, H. Tornqvist, J. Tscheuschner, V. Vaquero,
V. Wagner, S. Wang, V. Werner, X. Xu, H. Yamada, D. Yan, Z. Yang, M. Yasuda, and L. Zanetti, “Pairing forces govern population of
doubly magic 54 Ca from direct reactions,” Phys. Rev. Lett 126, 252501 (2021).
S. Escrig, A. I. Morales, S. Nishimura, M. Niikura, A. Poves, Z. Y. Xu, G. Lorusso, F. Browne, P. Doornenbal, G. Gey, H. -S. Jung, Z. Li,
P. -A. Soderstrom, T. Sumikama, J. Taprogge, Zs. Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, H. Baba, S. Franchoo, T. Isobe,
P. R. John, I. Kojouharov, S. Kubono, N. Kurz, I. Matea, K. Matsui, D. Mengoni, P. Morfouace, D. R. Napoli, F. Naqvi, H. Nishibata,A. Odahara, E. Sahin, H. Sakurai, H. Schaﬀner, I. G. Stefan, D. Suzuki, R. Taniuchi, V. Werner, and D. Sohler, “Persistence of theZ = 28 shell gap in A = 75 isobars: Identiﬁcation of a possible (1/2− )μs isomer in 75 Co and β decay to 75 Ni,” Phys. Rev. C 103, 064328(2021).
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C. Domingo-Pardo, A. Fijalkowska, N. Fukuda, S. Go, C. J. Griﬃn, R. Grzywacz, 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,
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N. Chiga, N. Fukuda, I. Gasparic, B. Hong, A. Horvat, T. Ichihara, K. Ieki, N. Inabe, Y. J. Kim, T. Kobayashi, Y. Kondo, P. Lasko,
H. S. Lee, Y. Leifels, J. Lukasik, J. Manfredi, A. B. McIntosh, P. Morfouace, T. Nakamura, N. Nakatsuka, S. Nishimura, R. Olsen,
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A. Moro, P. Navratil, K. Ogata, N. T. T. Phuc, N. Shimizu, V. Soma, Y. Utsuno, N. L. Achouri, H. Baba, F. Browne, D. Calvet,
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H. N. Liu, T. Motobayashi, I. Murray, H. Otsu, V. Panin, N. Paul, W. Rodriguez, H. Sakurai, M. Sasano, D. Steppenbeck, L. Stuhl,
Y. L. Sun, Y. Togano, T. Uesaka, K. Wimmer, K. Yoneda, O. Aktas, T. Aumann, F. Flavigny, S. Franchoo, I. Gasparic, R. -B. Gerst,
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[Review Article]
A. A. Aziz, N. S. Ahmad, S. Ahn, W. Aoki, M. Bhuyan, K. J. Chen, G. Guo, K. I. Hahn, T. Kajino, H. Abu Kassim, D. Kim, S. Kubono,
M. Kusakabe, A. Li, H. N. Li, Z. H. Li, W. P. Liu, Z. W. Liu, T. Motobayashi, K. C. Pan, T. -S. Park, J. R. Shi, X. D. Tang, W. Wang,
L. J. Wen, M. R. Wu H. L. Yan, and N. Yusof, “Progress in nuclear astrophysics of east and southeast Asia,” AAPPS Bulletin 31, 18(2021).

Presentations[Seminars]
R. Taniuchi, “Gamma-ray spectroscopy in the vicinity of double-magic 78 Ni,” NUSTAR Seminar, Online/GSI, Germany, June 2, 2021.
櫻井博儀, 「現代の錬金術による元素変換科学—元素合成, 魔法数から核変換まで—」, 日本物理学会第 5 回オンライン物理講話,
2021 年 10 月 23 日.

Award
谷内稜, 第 38 回 井上研究奨励賞（Inoue Research Award for Young Scientists）, 公益財団法人 井上科学振興財団, 2022 年 2 月 4 日.

Press Releases「高密度な中性子物質の硬さの測定に初めて成功—中性子星内の状態を実験室で再現—」, 2021 年 5 月 11 日.
「荷電対称性の破れを発見—クリプトン-70 とセレン-70 の形状は大きく異なっていた—」, 2021 年 5 月 19 日.

Outreach Activity
櫻井博儀, 2021 年度「はかる！」, 埼玉県立不動岡高等学校.

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