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

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. The other HiCARI programs will be
performed in 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

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

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
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 2017–2020.
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 data analysis is in progress to produce the first physics results. The first physics paper has
been published in 2020.
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)

Special Postdoctoral Researcher
Browne FRANK
Junior Research Associates
Hideki SHIMIZU (Univ. of Tokyo)

Takuma KOIWAI (Univ. of Tokyo)

International Program Associates
Juan SAIZ LOMAS (Univ. of York)

Xiaohui SUN (Peking Univ.)

Special Temporary Research Scientist- 214 -

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

Takashi ICHIHARA
Research Consultants
Akitsu IKEDA
Masayasu ISHIHARA

Kenichi MATSUYANAGI
Hiroyuki MURAKAMI

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

Kengo OGAWA (Chiba Univ.)

Visiting Scientists
Nori AOI (Osaka Univ.)
Giordano CERIZZA (Michigan State Univ.)
Jin-hee CHANG (Michigan State Univ.)
Silvio CHERUBINI (Univ. of Catania)
Martha Liliana CORTES SUA (INFN)
Mitsunori FUKUDA (Osaka Univ.)
Byungsik HONG (Korea Univ.)
Kazuo IEKI (Rikkyo 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.)
Hiu Ching LEE (The Univ. of Hong Kong)
Giuseppe LORUSSO (Nat’l Phys. Lab.)
Alan MCINTOSH (Texas A & M Univ.)
Yoshiharu MORI (Kyoto Univ.)
Tetsuya MURAKAMI (Kyoto Univ.)

Megumi NIIKURA (Univ. of Tokyo)
Evgueni NIKOLSKI (Kurchatov Inst.)
Daiki NISHIMURA (Tokyo City Univ.)
Takashi OHTSUBO (Niigata Univ.)
Hooi Jin ONG (Osaka Univ.)
Akira ONO (Tohoku Univ.)
Naohiko OTSUKA (IAEA)
Kazuhiro OYAMATSU (Aichi Shukutoku Univ.)
Clementine Angelique Marie-Th SANTAMARIA (Berkeley
Lab)
Paer-Anders SOEDERSTROEM (TU Darmstadt)
Maya TAKECHI (Niigata Univ.)
Ryo TANIUCHI (Univ. of York)Rensheng WANG (Soochow Univ.)
Hiroshi WATANABE (Beihang Univ.)
Kathrin WIMMER (Inst.o de Estructura de la Materia, Consejo
Superior de Investigaciones Cientias, CSIC)
Jin WU (Argonne Nat’l Lab.)
Yasutaka YAMAMOTO (Osaka Univ.)

Visiting Technicians
Jorge AGRAMUNT ROS (Valencia city hall)
Hilde DE WITTE (KU Leuven)

Herbert E. HESS (Univ. of Cologne)
Ivan KOJOUHAROV (GSI)

Visiting Researchers
Alejandro ALGORA (JSPS)
Benoit J. C. MAUSS (JSPS)

Byul MOON (Nat’l Res. Foundation)

Student Trainees
Takamichi AOKI (Univ. of Tokyo)
Takumi AOKI (Univ. of Tokyo)
Yusei BANDO (Univ. of Tokyo)
Jonathan BARNEY (Michigan State Univ.)
Linh BUI (Vietnam Atomic Energy Inst.)
Justin B. ESTEE (Michigan State Univ.)
Hiroaki FUKUSHIMA (Rikkyo Univ.)
Shinnosuke KANAYA (Osaka Univ.)
Masanori KANEKO (Kyoto Univ.)
Jiseok KIM (Korea Univ.)
Asahi KOHDA (Osaka Univ.)

Kei KOKUBUN (Univ. of Tokyo)
Shunpei KOYAMA (Univ. of Tokyo)
Jung Woo LEE (Korea Univ.)
Thomas G. PARRY (Univ. of Surrey)
Takeshi SAITO (Univ. of Tokyo)
Hidaka TANABE (Tsukuba Univ.)
Chun Yuen TSANG (Michigan State Univ.)
Phong VI (VNU Univ. of Sci.)
Ryo WAKABAYASHI (Osaka Univ.)
Tik Tsun YEUNG (The Univ. of Hong Kong)
Naoya YOSHIDA (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)

Noriko OKAYASU (Research Part-time Worker I)
Tsuneyo SUZUKI (Research Part-time Worker I)
Misuzu KANOU (Research Part-time Worker II)
Eiko MIZUMOTO (Research Part-time Worker II)- 215 -

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

List of Publications & Presentations
Publications[Original Papers]
B. Moon, A. Jungclaus, H. Naı̈dja, A. Gargano, R. Lozeva, C. -B. Moon, A. Odahara, G. S. Simpson, S. Nishimura, F. Browne, P. Doornenbal, G. Gey, J. Keatings, G. Lorusso, Z. Patel, S. Rice, M. Si, L. Sinclair, P. -A. Sd̈erström, T. Sumikama, J. Taprogge, H. Watanabe,
J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba, F. L. Bello Garrote, S. Bönig, R. Daido, J. M. Daugas, F. Didierjean, F. Drouet, Y. Fang,
N. Fukuda, R. Gernhäuser, B. Hong, E. Ideguchi, S. Ilieva, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I. Kojouharov,
T. Komatsubara, T. Kröll, T. Kubo, N. Kurz, Y. K. Kwon, C. S. Lee, P. Lee, Z. Li, A. Montaner-Pizá, S. Morimoto, K. Moschner,
D. Mücher, D. Murai, M. Niikura, H. Nishibata, I. Nishizuka, R. Orlandi, H. Sakurai, H. Schaﬀner, Y. Shimizu, K. Steiger, H. Suzuki,
H. Takeda, K. Tshoo, Z. Vajta, A. Wendt, R. Yokoyama, and K. Yoshinaga, “Nuclear structure of Te isotopes beyond neutron magic
number N = 82,”Phys. Rev. C 103, 034320 (2021).
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, J. -M. Gheller, A. Giganon, A. Gillibert, C. Hilaire, T. Isobe,
T. Kobayashi, Y. Kubota, V. Lapoux, T. Motobayashi, I. Murray, H. Otsu, V. Panin, N. Paul, W. Rodriguez, H. Sakurai, M. Sasano,
D. Steppenbeck, L. Stuhl, Y. Sun, Y. Togano, T. Uesaka, K. Wimmer, K. Yoneda, N. Achouri, O. Aktas, T. Aumann, L. Chung,Z. Dombrádi, F. Flavigny, S. Franchoo, I. Gašparić, R. -B. Gerst, J. Gibelin, K. Hahn, D. Kim, T. Koiwai, Y. Kondo, P. Koseoglou, J. Lee,
C. Lehr, B. Linh, H. Liu, T. Lokotko, M. MacCormick, K. Moschner, T. Nakamura, S. Park, D. Rossi, E. Sahin, P. -A. Söderström,
S. Takeuchi, H. Törnqvist, V. Vaquero, V. Wagner, S. Wang, V. Werner, X. Xu, H. Yamada, D. Yan, Z. Yang, M. Yasuda, and L. Zanetti,“First spectroscopic study of 51 Ar by the (p, 2p) reaction,” Phys. Lett. B 814, 136108 (2021).
Y. L. Sun, T. Nakamura, Y. Kondo, Y. Satou, J. Lee, T. Matsumoto, K. Ogata, Y. Kikuchi, N. Aoi, Y. Ichikawa, K. Ieki, M. Ishihara,
T. Kobayshi, T. Motobayashi, H. Otsu, H. Sakurai, T. Shimamura, S. Shimoura, T. Shinohara, T. Sugimoto, S. Takeuchi, Y. Togano,and K. Yoneda, “Three-body breakup of 6 He and its halo structure,” Phys. Lett. B 814, 136072 (2021).
K. Wimmer, W. Korten, P. Doornenbal, T. Arici, P. Aguilera, A. Algora, T. Ando, H. Baba, B. Blank, A. Boso, S. Chen, A. Corsi,
P. Davies, J. P. Delaroche, G. de. Angelis, G. de. France, D. T. Doherty, J. Gerl, R. Gernhäuser, T. Goigoux, M. Girod, D. Jenkins,
G. Kiss, S. Koyama, T. Motobayashi, S. Nagamine, M. Niikura, S. Nishimura, A. Obertelli, J. Libert, D. Lubos, T. R. Rodriguez,
V. H. Phong, B. Rubio, E. Sahin, T. Y. Saito, H. Sakurai, L. Sinclair, D. Steppenbeck, R. Taniuchi, V. Vaquero, R. Wadsworth, J. Wu,
and M. Zielinska, “Shape changes in the mirror nuclei 70 Kr and 70 Se,” Phys. Rev. Lett. 126, 072501 (2021).
G. Jhang, J. Estee, J. Barney, G. Cerizza, M. Kaneko, J. W. Lee, W. G. Lynch, T. Isobe, M. Kurata-Nishimura, T. Murakami, C. Y. Tsang,
M. B. Tsang, R. Wang, D. S. Ahn, L. Atar, T. Aumann, H. Baba, K. Boretzky, J. Brzychczyk, N. Chiga, N. Fukuda, I. Gasparic,
B. Hong, A. Horvat, 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, H. Otsu, P. Pawfowski, K. Pelczar, D. Rossi,
H. Sakurai, C. Santamaria, H. Sato, H. Scheit, R. Shane, Y. Shimizu, H. Simon, A. Snoch, A. Sochocka, Z. Sosin, T. Sumikama,
H. Suzuki, D. Suzuki, H. Takeda, S. Tangwancharoen, H. Toernqvist, Y. Togano, Z. G. Xiao, S. J. Yennello, J. Yurkon, Y. Zhang, theSπRIT Collaboration M. Colonna, D. Cozma, P. Danielewicz, H. Elfner, N. Ikeno, C. MingKo, J. Mohs, D. Oliinychenko, A. Ono,
J. Suae, Y. J. Wang, H. Wolter, J. Xu, Y. X. Zhang, and Z. Zhang, the TMEP Collaboration, “Symmetry energy investigation with pion
production from Sn + Sn systems,” Phys. Lett. B 813, 136016 (2021).
S. E. A. Orrigo, B. Rubio, W. Gelletly, P. Aguilera, A. Algora, A. I. Morales, J. Agramunt, D. S. Ahn, P. Ascher, B. Blank, C. Borcea,
A. Boso, R. B. Cakirli, J. Chiba, G. De. Angelis, G. De. France, F. Diel, P. Doornenbal, Y. Fujita, N. Fukuda, E. Ganioglu, M. Gerbaux,
J. Giovinazzo, S. Go, T. Goigoux, S. Grevy, V. Guadilla, N. Inabe, G. G. Kiss, T. Kubo, S. Kubono, T. Kurtukian-Nieto, D. Lubos,
C. Magron, F. Molina, A. Montaner-Piza, D. Napoli, D. Nishimura, S. Nishimura, H. Oikawa, V. H. Phong, H. Sakurai, Y. Shimizu,
C. Sidong, P. -A. Söderström, T. Sumikama, H. Suzuki, H. Takeda, Y. Takei, M. Tanaka, J. Wu, and S. Yagi, “β Decay of the very
neutron-deficient 60 Ge and 62 Ge nuclei,” Phys. Rev. C 103, 014324 (2021).
T. Sumikama, N. Fukuda, N. Inabe, D. Kameda, T. Kubo, Y. Shimizu, H. Suzuki, H. Takeda, K. Yoshida, H. Baba, F. Browne, A. M. Bruce,
R. Carroll, N. Chiga, R. Daido, F. Didierjean, P. Doornenbal, Y. Fang, G. Gey, E. Ideguchi, T. Isobe, S. Lalkovski, Z. Li, G. Lorusso,
R. Lozeva, H. Nishibata, S. Nishimura, I. Nishizuka, A. Odahara, Z. Patel, Z. Podolyák, P. H. Regan, S. Rice, O. J. Roberts, H. Sakurai,
G. S. Simpson, L. Sinclair, P. -A. Söderström, M. Tanaka, J. Taprogge, H. Watanabe, V. Werner, O. Wieland, J. Wu, Z. Y. Xu, andA. Yagi, “Observation of new neutron-rich isotopes in the vicinity of 110 Zr,” Phys. Rev. C 103, 014614 (2021).
T. Sumikama, D. S. Ahn, N. Fukuda, Y. Shimizu, H. Suzuki, H. Takeda, H. Wang, K. Yoshida, J. Amano, N. Chiga, K. Chikaato,
A. Hirayama, N. Inabe, S. Kawase, S. Kubono, M. Matsushita, S. Michimasa, K. Nakano, H. Otsu, H. Sakurai, A. Saito, S. Shimoura,
J. Suwa, M. Takechi, S. Takeuchi, Y. Togano, T. Tomai, and Y. Watanabe, “Energy-control and novel particle-identification methods
combined with range in a multi-sampling ionization chamber for experiments using slowed-down RI beams,” Nucl. Instrum. Methods
Phys. Res. A 986, 164687 (2021).
M. L. Cortés, W. Rodriguez, P. Doornenbal, A. Obertelli, J. D. Holt, J. Menéndez, K. Ogata, A. Schwenk, N. Shimizu, J. Simonis,
Y. Utsuno, K. Yoshida, L. Achouri, H. Baba, F. Browne, D. Calvet, F. Château, S. Chen, N. Chiga, A. Corsi, 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, H. Sakurai, M. Sasano, D. Steppenbeck, L. Stuhl, Y. L. Sun, Y. Togano, T. Uesaka, K. Wimmer, K. Yoneda, O. Aktas,
T. Aumann, L. X. Chung, F. Flavigny, S. Franchoo, I. Gašparı́c, R. -B. Gerst, J. Gibelin, K. I. Hahn, D. Kim, T. Koiwai, 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. Söderström, 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, “N = 32 shell closure below calcium: Low-lying structure of 50 Ar,” Phys. Rev. C 102, 064320(2020).
A. Jungclaus, J. M. Keatings, G. S. Simpson, H. Naı̈dja, A. Gargano, S. Nishimura, P. Doornenbal, G. Gey, G. Lorusso, P. -A. Söderström,- 216 -

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

T. Sumikama, J. Taprogge, Z. Y. Xu, H. Baba, F. Browne, N. Fukuda, N. Inabe, T. Isobe, H. S. Jung, D. Kameda, G. D. Kim, Y. -K. Kim,
I. Kojouharov, T. Kubo, N. Kurz, Y. K. Kwon, Z. Li, H. Sakurai, H. Schaﬀner, Y. Shimizu, H. Suzuki, H. Takeda, Z. Vajta, H. Watanabe,
J. Wu, A. Yagi, K. Yoshinaga, S. Bönig, J. -M. Daugas, R. Gernhäuser, S. Ilieva, T. Kröll, A. Montaner-Piza, K. Moschner, D. Mücher,
H. Nishibata, A. Odahara, R. Orlandi, M. Scheck, K. Steiger, and A. Wendt, “Evolution of proton single-particle states in neutron-rich
Sb isotopes beyond N = 82,” Phys. Rev. C 102, 034324 (2020).
A. Gottardo, G. de Angelis, P. Doornenbal, L. Coraggio, A. Gargano, N. Itaco, K. Kaneko, P. Van Isacker, T. Furumoto, G. Benzoni,
J. Lee, H .Liu, M. Matsushita, D. Mengoni, V. Modamio-Hoybjor, S. Momiyama, T. Motobayashi, D. R. Napoli, M. Niikura, E. Sahin,
Y. Shiga, H. Sakurai, R. Taniuchi, S. Takeuchi, H. Wang, J. J. Valiente-Dobon, R. Avigo, H. Baba, N. Blasi, F. L. Bello Garrote,
F. Browne, F. C. L. Crespi, S. Ceruti, R .Daido, M. -C. Delattre, D. Fang, Zs. Dombradi, T. Isobe, I. Kuti, G. Lorusso, K. Matsui,
B. Melon, T. Miyazaki, S. Nishimura, R. Orlandi, Z. Patel, S. Rice, L. Sinclair, P. A. Soderstrom, D .Sohler, T. Sumikama, J. Taprogge,
Zs. Vajta, H. Watanabe, O. Wieland, J. Wu, Z. Y. Xu, M. Yalcinkaya, and R. Yokoyama, “Transition strengths in the neutron-rich
73, 74, 75
Ni isotopes,” Phys. Rev. C 102, 014323 (2020).
J. J. Liu, J. Lee, H. Watanabe, S. Nishimura, G. X. Zhang, J. Wu, P. M. Walker, P. H. Regan, P. -A. Söderström, H. Kanaoka, Z. Korkulu,
P. S. Lee, A. Yagi, A. C. Dai, F. R. Xu, D. S. Ahn, T. Alharbi, H. Baba, F. Browne, A. M. Bruce, R. J. Carroll, K. Y. Chae, Zs. Dombradi,
P. Doornenbal, A. Estrade, N. Fukuda, C. Griﬃn, E. Ideguchi, N. Inabe, T. Isobe, S. Kanaya, I. Kojouharov, F. G. Kondev, T. Kubo,
S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G. J. Lane, C. S. Lee, E. J. Lee, G. Lorusso, G. Lotay, C. B. Moon, I. Nishizuka, C. R. Nita,
A. Odahara, Z. Patel, V. H. Phong, Zs. Podolyak, O. J. Roberts, H. Sakurai, H. Schaﬀner, C. M. Shand, Y. Shimizu, T. Sumikama,
H. Suzuki, H. Takeda, S. Terashima, Zs. Vajta, J. J. Valiente-Dobon, and Z. Y. Xu, “Isomeric and β-decay spectroscopy of decay of173, 174
Ho,” Phys. Rev. C 102, 024301 (2020).
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,
Z. Dombradi, Y. Fang, S. Franchoo, G. Gey, A. Gottardo, K. Hadynska-Klek, 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, Z. 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 (2020).
J. Park, R. Krücken, A. Blazhev, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, P. Boutachkov,
F. Frowne, I. Čeliković, G.de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska,
H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y. -K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y. K. Kwon,
G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaﬀner, Y. Shimizu, L. Sinclair,
P. -A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu, “Spectroscopy of 99 Cd
and 101 In from β decay of 99 In and 101 Sn,” Phys. Rev. C 102, 014304 (2020).
A. Frotscher, M. Gómez-Ramos, A. Obertelli, P. Doornenbal, G. Authelet, H. Baba, D. Calvet, F. Château, S. Chen, A. Corsi, A. Delbart,
J. -M. Gheller, A. Giganon, A. Gillibert, T. Isobe, V. Lapoux, M. Matsushita, S. Momiyama, T. Motobayashi, M. Niikura, H. Otsu,
N. Paul, C. Péron, A. Peyaud, E. C. Pollacco, J. -Y. Roussé, H. Sakurai, C. Santamaria, M. Sasano, Y. Shiga, N. Shimizu, D. Steppenbeck, S. Takeuchi, R. Taniuchi, T. Uesaka, H. Wang, K. Yoneda, T. Ando, T. Arici, A. Blazhev, F. Browne, A. M. Bruce, R. Carroll,
L. X. Chung, M. L. Cortés, M. Dewald, B. Ding, Z. Dombradi, F. Flavigny, S. Franchoo, F. Giacoppo, M. Górska, A. Gottardo,
K. Hadynska-Klek, Z. Korkulu, S. Koyama, Y. Kubota, A. Jungclaus, J. Lee, M. Lettmann, B. D. Linh, J. Liu, Z. Liu, C. Lizarazo,
C. Louchart, R. Lozeva, K. Matsui, T. Miyazaki, K. Moschner, S. Nagamine, N. Nakatsuka, C. Nita, S. Nishimura, C. R. Nobs,
L. Olivier, S. Ota, Z. Patel, Z. Podolyák, M. Rudigier, E. Sahin, T. Y. Saito, C. Shand, P. -A. Söderström, I. G. Stefan, T. Sumikama,
D. Suzuki, R. Orlandi, V. Vaquero, Z. Vajta, V. Werner, K. Wimmer, J. Wu, and Z. Xu, “Sequential nature of (p, 3p) two-proton
knockout from neutron-rich nuclei,” Phys. Rev. Lett. 125, 012501 (2020).
X. H. Sun, H. Wang, H. Otsu, H. Sakurai, D. S. Ahn, M. Aikawa, N. Fukuda, T. Isobe, S. Kawakami, S. Koyama, T. Kubo, S. Kubono,
G. Lorusso, Y. Maeda, A. Makinaga, S Momiyama, K. Nakano, S. Nakayama, M. Niikura, Y. Shiga, P. -A. Soderstrom, H. Suzuki,
H. Takeda, S. Takeuchi, R. Taniuchi, Ya. Watanabe, Yu. Watanabe, H. Yamasaki, X. F. Yang, Y. L. Ye, and K. Yoshida, “Spallationand fragmentation cross sections for 168 MeV/nucleon 136 Xe ions on proton, deuteron, and carbon targets,” Phys. Rev. C 101, 064623(2020).
J. W. Lee, G. Jhang, G. Cerizza, J. Barney, J. Estee, T. Isobe, M. Kaneko, M. Kurata-Nishimura, W. G. Lynch, T. Murakami, C. Y. Tsang,
M. B. Tsang, R. Wang, B. Hong, A. B. McIntosh, H. Sakurai, C. Santamaria, R. Shane, S. Tangwancharoen, S. J. Yennello, Y. Zhang,
For the SπRIT Collaboration “Charged particle track reconstruction with SπRIT time projection chamber,” Nucl. Instrum. Methods
Phys. Res. A 965, 163840 (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 222504(2020).
K. Wimmer, T. Arici, W. Korten, P. Doornenbal, J. -P. Delaroche, M. Girod, J. Libert, T. R. Rodrigue, P. Aguilera, A. Algora, T. Ando,
H. Baba, B. Blank, A. Boso, S. Chen, A. Corsi, P. Davies, G. de. Angelis, G. de. France, D. T. Doherty, J. Gerl, R. Gernhäuser,
T. Goigoux, D. Jenkins, G. Kiss, S. Koyama, T. Motobayashi, S. Nagamine, M. Niikura, S. Nishimura, A. Obertelli, D. Lubos,
V. H. Phong, B. Rubio, E. Sahin, T. Y. Saito, H. Sakurai, L. Sinclair, D. Steppenbeck, R. Taniuchi, V. Vaquero, R. Wadsworth, J. Wu,
and M. Zielinska, “Shape coexistence revealed in the N = Z isotope 72 Kr through inelastic scattering.” Eur. Phys. J. A 56.6, 1–12
(2020).

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C. Lizarazo, P. -A. Söderström, V. Werner, N. Pietralla, P. M. Walker, G. X. Dong, F. R. Xu, T. R. Rodrı́guez, F. Browne, P. Doornenbal,
S. Nishimura, C. R. Nita, A. Obertelli, T. Ando, T. Arici, G. Authelet, H. Baba, A. Blazhev, A. M. Bruce, D. Calvet, R. J. Caroll,F. Château, S. Chen, L. X. Chung, A. Corsi, M. L. Cortés, A. Delbart, M. Dewald, B. Ding, F. Flavigny, S. Franchoo, J. Gerl, J. M. Gheller, A. Giganon, A. Gillibert, M. Górska, A. Gottardo, I. Kojouharov, N. Kurz, V. Lapoux, J. Lee, M. Lettmann, B. D. Linh,
J. J. Liu, Z. Liu, S. Momiyama, K. Moschner, T. Motobayashi, S. Nagamine, N. Nakatsuka, M. Niikura, C. Nobs, L. Olivier, Z. Patel,
N. Paul, Z. Podolyák, J. -Y. Roussé, M. Rudigier, T. Y. Saito, H. Sakurai, C. Santamaria, H. Schaﬀner, C. Shand, I. Stefan, D. Steppenbeck, R. Taniuchi, T. Uesaka, V. Vaquero, K. Wimmer, and Z. Xu, “Metastable states of 92, 94Se: Identification of an oblate K isomerof 94 Se and the ground-state shape transition between N = 58 and 60,” Phys. Rev. Lett. 124, 222502 (2020).
J. Wu, S. Nishimura, P. Möller, M. R. Mumpower, R. Lozeva, C. B. Moon, A. Odahara, H. Baba, F. Browne, R. Daido, P. Doornenbal, Y. F. Fang, M. Haroon, T. Isobe, H. S. Jung, G. Lorusso, B. Moon, Z. Patel, S. Rice, H. Sakurai, Y. Shimizu, L. Sinclair,
P. -A. Söderström, T. Sumikama, H. Watanabe, Z. Y. Xu, A. Yagi, R. Yokoyama, D. S. Ahn, F. L. Bello Garrote, J. M. Daugas, F. Didierjean, N. Fukuda, N. Inabe, T. Ishigaki, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, N. Kurz, K. Y. Kwon, S. Morimoto,D. Murai, H. Nishibata, H. Schaﬀner, T. M. Sprouse, H. Suzuki, H. Takeda, M. Tanaka, K. Tshoo, and Y. Wakabayashi, “β-Decay
half-lives of 55 neutron-rich isotopes beyond the N = 82 shell gap,” Phys. Rev. C 101, 042801 (R) (2020).
J. Ha, T. Sumikama, F. Browne, N. Hinohara, A. M. Bruce, S. Choi, I. Nishizuka, S. Nishimura, P. Doornenbal, G. Lorusso, P. A. Söderström, H. Watanabe, R. Daido, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, A. Yagi, H. Baba, N. Chiga, R. Carroll,F. Didierjean, Y. Fang, N. Fukuda, G. Gey, E. Ideguchi, N. Inabe, T. Isobe, D. Kameda, I. Kojouharov, N. Kurz, T. Kubo, S. Lalkovski,
Z. Li, R. Lozeva, H. Nishibata, A. Odahara, Z. Podolyák, P. H. Regan, O. J. Roberts, H. Sakurai, H. Schaﬀner, G. S. Simpson, H. Suzuki,
H. Takeda, M. Tanaka, J. Taprogge, V. Werner, and O. Wieland, “Shape evolution of neutron-rich 106, 108, 110 Mo isotopes in the triaxial
degree of freedom,” Phys. Rev. C 101, 044311 (2020).
H. Watanabe, Y. X. Wanatabe, Y. Hirayama, A. N. Andreyev, T. Hashimoto, F. G. Kondev, G. J. Lane, Yu.A. Litinov, J. J. Liu, H. Miyatake,J. Y. Moon, A. I. Morales, M. Mukai, S. Nishimura, T. Niwase, M. Rosenbusch, P. Schury, Y. Shi, M. Wada, and P. M. Walker, “Betadecay of the axially asymmetric ground state of 192 Re,” Phys. Lett. B 814, 136088 (2021).
C. Y. Tsang, J. Estee, R. Wang, J. Barney, G. Jhang, W. G. Lynch, Z. Q. Zhang, G. Cerizza, T. Isobe, M. Kaneko, M. Kurata-Nishimura,J. W. Lee, T. Murakami, and M. B. Tsang, the SπRIT Collaboration, “Space charge eﬀects in the SπRIT time projection chamber,”Nucl. Instrum. Methods Phys. Res. A 959, 163477 (2020).
X. Pereira-Lopez, B. Fernandez-Dominguez, F. Delaunay, N. L. Achouri, N. A. Orr, W. N. Catford, M. Assie, S. Bailey, B. Bastin,
Y. Blumenfeld, R. Borcea, M. Caamano, L. Caceres, E. Clement, A. Corsi, N. Curtis, Q. Deshayes, F. Farget, M. Fisichella, G. de
France, S. Franchoo, M. Freer, J. Gibelin, A. Gillibert, G. F. Grinyer, F. Hammache, O. Kamalou, A. Knapton, T. Kokalova, V. Lapoux,
J. A. Lay, B. Le Crom, S. Leblond, J. Lois-Fuentes, F. M. Marques, A. Matta, P. Morfouace, A. M. Moro, T. Otsuka, J. Pancin, L. Perrot,
J. Piot, E. Pollacco, D. Ramos, C. Rodriguez-Tajes, T. Roger, F. Rotaru, M. Senoville, N. de Sereville, R. Smith, O. Sorlin, M. Stanoiu,
I. Stefan, C. Stodel, D. Suzuki, T. Suzuki, J. C. Thomas, N. Timofeyuk, M. Vandebrouck, J. Walshe, and C. Wheldon, “Low-lying
single-particle structure of 17 C and the N = 14 sub-shell closure,” Phys. Lett. B 811, 135939 (2020).
K. Makiguchi, W. Horiuchi, and A. Kohama, “Utility of antiproton-nucleus scattering for probing nuclear surface density distributions,”
Phys. Rev. C 102, 034614 (2020).
N. T. Zhang, X. Y. Wang, D. Tudor, B. Bucher, I. Burducea, H. Chen, Z. J. Chen, D. Chesneanu, A. I. Chilug, L. R. Gasques, D. G. Ghita,
C. Gomoiu, K. Hagino, S. Kubono, Y. J. Li, C. J. Lin, W. P. Lin, R. Margineanu, A. Pantelica, I. C. Stefanescu, M. Straticiuc,
X. D. Tang, L. Trache, A. S. Umar, W. Y. Xin, S. W. Xu, and Y. Xu, “Constraining the 12 C + 12 C astrophysical S -factors with the12
C + 13 C measurements at very low energies,” Phys. Lett. B 801, 135170 (2020).
N. Iwasa, S. Ishikawa, S. Kubono, T. Sakakibara, K. Kominato, K. Nishio, M. Matsuda, K. Hirose, H. Makii, R. Orlandi, K. Asada,
D. Guru, S. Nishimura, S. Hayakawa, and T. Kawabata, “Experimental study of the Γ p1 /Γ p0 ratios of resonance states in 8 Be fordeducing the 7 Be(n, p1 )7 Li∗ reaction rate relevant to the cosmological lithium problem,” Phys. Rev. C 103, 015801 (2021).

[Review Articles]
H. Yamaguchi, D. Kahl, and S. Kubono, “CRIB: The low energy in-flight RI beam separator,” Nuclear Physics News (NUPECC) 30, 21(2020).

[Proceedings]
K. Nakano, Y. Watanabe, S. Kawase, H. Wang, H. Otsu, H. Sakurai, N. Chiga, J. Suwa, T. Sumikama, S. Takeuchi, T. Nakamura,
K. Chikaato, M. Takechi, S. Koyama, D. S. Ahn, H. Baba, S. Chen, M. L. Cortes, P. Doornenbal, N. Fukuda, A. Hirayama, R. Hosoda,
T. Isobe, S. Kawakami, Y. Kondo, S. Kubono, Y. Maeda, S. Masuoka, S. Michimasa, I. Murray, R. Nakajima, M. Niikura, T. Ozaki,
A. Saito, T. Saito, H. Sato, Y. Shimizu, S. Shimoura, Y. Soudo, P. A. Soderstrom, X. Sun, D. Suzuki, H. Suzuki, H. Takeda, Y.vTogano,
T. Tomai, H. Yamada, M. Yasuda, and K. Yoshida, “Isotope-production cross sections of residual nuclei in proton- and deuteron-induced
reactions on 93 Zr at 50 MeV/u,” Proc. Intern. Conf. Nuclear Data for Science and Technology (ND2019), Beijing, China, May 19–24,
2019, Z. Ge et al., Eds., p. 20006 (2020).
J. Giovinazzo, T. Goigoux, B. Blank, P. Ascher, M. Gerbaux, S. Grevy, T. Kurtukian-Nieto, C. Magron, P. Doornenbal, N. Fukuda,
N. Inabe, G. Kiss, T. Kubo, S. Kubono, S. Nishimura, H. Sakurai, Y. Shimizu, C. Sidong, P. Soderstrom, T. Sumikama, H. Suzuki,
H. Takeda, P. Vi, J. Wu, D. Ahn, J. Agramunt, A. Algora, V. Guadilla, A. Montaner-Piza, A. Morales, S. Orrigo, B. Rubio, Y. Fujita,
M. Tanaka, W. Gelletly, P. Aguilera, F. Molina, F. Diel, D. Lubos, G. de Angelis, D. Napoli, C. Borcea, A. Boso, R. Cakirli, E. Ganioglu,
J. Chiba, D. Nishimura, H. Oikawa, Y. Takei, S. Yagi, K. Wimmer, G. de France, S Go, and B. Brown, “Two-proton radioactivity: theinteresting case of 67 Kr and further studies,” Acta Phys. Pol. B 51, 577 (2020).

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Presentations[International Conferences/Workshops]
H. Sakurai (invited), “Highlights and future directions of RIBF,” Yamada Conference LXXII: The 8th Asia-Pacific Conference on FewBody Problems in Physics, Kanazawa, Japan, March 1–5, 2021.
H. Sakurai (invited), “Physics of exotic nuclei in a 10-year perspective,” Workshop on Frontiers of Nuclear Structure and Nuclear Astrophysics and Toward PKU-UT Joint Research Center on Nuclear Physics, Fragrant Hill Hotel and Online, Beijing, October 14–16,
2020.
P. Doornenbal (invited), “High-resolution in-beam gamma-ray spectroscopy at the RIBF with HiCARI,” NUSTAR Annual Meeting 2021,
Online, February 22–26, 2021.
D. Suzuki (invited), “Two neutron transfer resonances via alpha scattering,” International mini-workshop on physics in resonant reaction
induced by low-energy RI beam, Japan, February 22, 2021.
D. Suzuki (invited), “Spectroscopy of light exotic nuclei beyond the proton drip line,” Yamada Conference LXXII: The 8th Asia-PacificConference on Few-Body Problems in Physics, Kanazawa, Japan, March 1–5, 2021.
K. Asahi (invited), “Electric dipole moment of diamagnetic atom 129 Xe as a probe for new physics,” Fundamental Sciences and Quantum
Technologies using Atomic Systems (FSQT2020) (on-line), Physical Research Laboratory, Navrangpura, Ahmedabad, India, September 28–October 1, 2020.
S. Kubono (invited), “Challenge to explosive hydrogen burning in nuclear physics—study of rp-process and νp-process,” NAOJ Workshop
on Stellar Alchemy to Galactic Archeology, October 26–29, 2020.

[Domestic Conferences/Workshops]
櫻井博儀（招待講演）, 「不安定核ビームが開拓するエキゾチック原子核の物理」, シンポジウム「大強度不安定核ビームが拓く新領域」, 日本物理学会第 76 回年次大会, オンライン開催, 2021 年 3 月 12–15 日.
S. Nishimura (invited), “Frontier of experimental activities relevant to r-process nucleosynthesis at RIBF,” KEK Workshop: Beta decay,r process and related weak interaction processes, February 19, 2021.
S. Nishimura (invited), 「不安定核から探るランタノイド元素合成の謎」, NAOJ Workshop: Stellar Alchemy to Galactic Archeology,
October 26–29, 2020.
槇口雄仁, 堀内渉, 小濱洋央（口頭発表）, 「原子核密度分布に対する反陽子-原子核散乱の有用性」, 日本物理学会 2020 年秋季大会,
オンライン開催, 2020 年 9 月 14–17 日.
F. Browne (oral), “Single-particle energies and strengths around 55 Sc,” FY2020 SPDR Presentation Session, Wako, Japan, January 18,
2021.

[Seminars]
H. Sakurai, “Overview of research activities and plans at RIBF,” The C2R2 (CENS, CENuM, RUA, RULIC) Seminar, on-line, CENS,IBS, Korea, October 22, 2020.
K. Asahi, “Electric dipole moment of diamagnetic atom 129 Xe as a probe for new physics,” ISOLDE Physics Group Seminar, on-line &CERN, Geneva, Switzerland, November 19, 2020.
T. Isobe, 「理研不安定核ビームで探る中性子星の状態方程式」, Physics Seminar, Nara Women’s University, Nara, Japan, July 21, 2020.

AwardsPress Releases「フッ素-29 が「2 中性子ハロー原子核」であることを発見—魔法数 20 の消失と中性子ハロー構造の出現—」, 2020 年 8 月 21 日.

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