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

Nuclear Science and Transmutation Research Division
Spin isospin Laboratory
1. Abstract

The Spin Isospin Laboratory pursues research activities putting primary focus on interplay of spin and isospin in exotic nuclei.
Understanding nucleosyntheses in the universe, especially those in r- and rp-processes is another big goal of our laboratory.
Investigations on isospin dependences of nuclear equation of state, spin-isospin responses of exotic nuclei, occurrence of various
correlations at low-densities, evolution of spin-orbit coupling are main subjects along the line. We are leading a mass measurement
project with the Rare RI Ring project, too. Through the experimental studies, we will be able to elucidate a variety of nuclear
phenomena in terms of interplay of spin and isospin, which will in turn, lead us to better understanding of our universe.

2. Major Research Subjects
(1)
(2)
(3)
(4)
(5)

Direct reaction studies of neutron-matter equation of state
Study of spin-isospin responses with RI-beams
R-process nucleosynthesis study with heavy-ion storage ring
Application of spin-polarization technique to RI-beam experiments and other fields
Development of special targets for RI-beam experiments

3. Summary of Research Activity(1) Direct reaction studies of neutron matter equation of state
Direct reactions induced by light-ions serve as powerful tools to investigate various aspects of nuclei. We are advancing experimental programs to explore equation of state of neutron matter, via light-ion induced reactions with RI-beams.
(1-1) Determination of a neutron skin thickness by proton elastic scattering
A neutron skin thickness is known to have strong relevance to asymmetry terms of nuclear equation of state, especially to aterm proportional to density. The ESPRI project aims at determining density distributions in exotic nuclei precisely by proton elastic
scattering at 200–300 MeV/nucleon. An experiment for 132 Sn that is a flagship in this project has been successfully performed.
(1-2) Asymmetry terms in nuclear incompressibility
Nuclear incompressibility represents stiﬀness of nuclear matter. Incompressibility of symmetric nuclear matter is determined
to be 230 ± 20 MeV, but its isospin dependence still has a large uncertainty at present. A direct approach to the incompressibilityof asymmetric nuclear matter is an experimental determination of energies of isoscalar giant monopole resonances (GMR) in heavy
nuclei. We have developed, in close collaboration with Center for Nuclear Study (CNS) of University of Tokyo, an active gas target
for deuteron inelastic scattering experiments to determine GMR energies. The active gas target has been already tested with oxygen
and xenon beams at HIMAC and finally has been applied to a 132 Sn experiment at RIBF.
(1-3) Multi-neutron and α-cluster correlations at low densities
Occurrences of multi-neutron and α-cluster correlations are other interesting aspects of nuclear matter and define its low-density
behavior. The multi-neutron and α-cluster correlations can be investigated with the large-acceptance SAMURAI spectrometer. The
SAMURAI has been already applied to experiments to explore light neutron-rich nuclei close to the dripline. We plan to reinforce
experimental capabilities of the SAMURAI by introducing advanced devices such as MINOS (Saclay) and NeuLAND (GSI).
(1-4) Fission barrier heights in neutron-rich heavy nuclei
The symmetry energy has a strong influence on fission barrier heights in neutron-rich nuclei. Knowledge on the fission barrierheights, which is quite poor at present, is quite important for our proper understanding on termination of the r-process. We are planningto perform, in collaboration with the TU Munich group, (p, 2p)-delayed fission experiments at the SAMURAI to determine the fission
barrier heights in neutron-rich nuclei in Pb region.
(2) Study of spin-isospin responses with RI-beams
The study of spin-isospin responses in nuclei forms one of the important cores of nuclear physics. A variety of collective states,for example isovector giant dipole resonances, isobaric analogue states, Gamow-Teller resonances, have been extensively studied byuse of electromagnetic and hadronic reactions from stable targets.
The research opportunities can be largely enhanced with light of availabilities of radioactive isotope (RI) beams and of physics of
unstable nuclei. There are three possible directions to proceed. The first direction is studies of spin-isospin responses of unstable nuclei
via inverse-kinematics charge exchange reactions. A neutron-detector array WINDS has been constructed, under a collaboration of
CNS, Tokyo and RIKEN, for inverse kinematics (p, n) experiments at the RI Beam Factory. We have already applied WINDS to the(p, n) experiments for 12 Be, 132 Sn and plan to extend this kind of study to other exotic nuclei.
The second direction is studies with RI-beam induced charge exchange reaction. RI-beam induced reactions have unique properties which are missing in stable-beam induced reactions and can be used to reach the yet-to-be-discovered states. We have constructed
the SHARAQ spectrometer and the high-resolution beam-line at the RI Beam Factory to pursue the capabilities of RI-beam induced
reactions as new probes to nuclei. One of the highlights is an observation of β+ type isovector spin monopole resonances (IVSMR) in
208
Pb and 90 Zr via the (t, 3 He) reaction at 300 MeV/nucleon.
The third direction is studies of neutron- and proton-rich nuclei via stable-beam induced charge exchange reactions, which is
conducted under collaboration with Research Center for Nuclear Physics (RCNP), Osaka University. We have performed the double- 220 -

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

charge exchange 12 C(18 O,18 Ne) 12 Be reaction at 80 MeV/nucleon to investigate structure of a neutron-rich 12 Be nucleus. Peaks corresponding to ground and excited levels in 12 Be have been clearly observed. Another double charge exchange reaction, (12 C,12 Be(0+2 ))are being used to search for double Gamow-Teller resonances.
(3) R-process nucleosynthesis study with heavy-ion storage ring
Most of the r-process nuclei become within reach of experimental studies for the first time at RI Beam Factory at RIKEN. The
Rare RI Ring at RIBF is the unique facility with which we can perform mass measurements of r-process nuclei. Construction of theRare RI Ring started in FY2012 in collaboration with Tsukuba and Saitama Universities. A major part of the ring has been completed
and the commissioning run is planned in FY2014.
We are planning to start precise mass measurements of r-process nuclei soon. A series of experiments will start with nuclei in the
A = 80 region and will be extended to heavier region.
(4) Application of spin-polarization technique to RI-beam experiments and other fields
A technique to produce nuclear polarization by means of electron polarization in photo-excited triplet states of aromatic molecules
can open new applications. The technique is called “Tripletd-DNP.” A distinguished feature of Triplet-DNP is that it works under alow magnetic field of 0.1–0.7 T and temperature higher than 100 K, which exhibits a striking contrast to standard dynamic nuclear
polarization (DNP) techniques working in extreme conditions of several Tesla and sub-Kelvin.
We have constructed a polarized proton target system for use in RI-beam experiments. Recent experimental and theoretical studies
have revealed that spin degrees of freedom play a vital role in exotic nuclei. Tensor force eﬀects on the evolution of shell and possible
occurrence of p-n pairing in the proton-rich region are good examples of manifestations of spin degrees of freedom. Experimentswith the target system allow us to explore the spin eﬀects in exotic nuclei. It should be noted that we have recently achieved a proton
polarization of 40% at room temperature in a pentacene-d14 doped p-terphenyl crystal.
Another interesting application of Triplet-DNP is sensitivity enhancement in NMR spectroscopy of biomolecules. We started a
new project to apply the Triplet-DNP technique to study protein-protein interaction via two-dimensional NMR spectroscopy, in close
collaboration with biologists and chemists.
(5) Development of special targets for RI-beam experiments
For the research activities shown above, we are developing and hosting special targets for RI-beam experiments listed below:(a) Polarized proton target (described in (4))(b) Thin solid hydrogen target(c) MINOS (developed at Saclay and hosted by the Spin Isospin Laboratory)

Members
Director
Tomohiro UESAKA
Research/Technical Scientists
Masaki SASANO (Senior Research Scientist)
Ken-ichiro YONEDA (Senior Research Scientist)

Sarah NAIMI (Research Scientist)

Research & Development Scientist
Yohei SHIMIZU
Contract Researchers
Takeshi INOUE

Kenichiro TATEISHI

Postdoctoral Researcher
Junki TANAKA
Research Associate
Akane SAKAUE
Junior Research Associates
Tomoya HARADA

Shoichiro MASUOKAInternational Program Associates
Siwei HUANG (Peking Univ.)
Alexandra-Ionela STEFANESCU (Univ. of Bucharest)

Ionut-Catalin STEFANESCU (Univ. of Bucharest)- 221 -

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

Research Consultants
Harutaka SAKAGUCHI (Osaka Univ.)
Yasuyuki SUZUKI

Kazuko TANABE

Senior Visiting Scientists
Hiroyuki SAGAWA (Univ. of Aizu)
Satoshi ADACHI (Osaka Univ.)
Hidetoshi AKIMUNE (Konan Univ.)
Didier BEAUMEL (Inst. de Phys.Nucl.)
Konstanze BORETZKY (GSI)
Christoph CAESAR (GSI)
Anna CORSI (CEA Saclay)
Zsolt DOMBRADI (ATOMKI)
Zoltan ELEKES (ATOMKI)
Zsolt FULOP (ATOMKI)
Tatsuya FURUNO (Osaka Univ.)
Igor GASPARIC (Rudjer Boskovic Inst.)
Zhuang GE (IMP, CAS)
Alain GILLIBERT (CEA Saclay)
Valdir GUIMARAES (Inst.o de Fisica da Univ. de Sao Paulo)
Zoltan HALASZ (ATOMKI)
Matthias HOLL (TRIUMF)
Kaori KAKI (Shizuoka Univ.)
KAWABATA (Osaka Univ.)
KIKUCHI (NIT, Tokuyama College)
Yosuke KONDO (Tokyo Tech)
Zeren KORKULU (ATOMKI)
Attila KRASZNAHORKAY (ATOMKI)
Dorottya KUNNE SOHLER (ATOMKI)
Istvan KUTI (ATOMKI)
Valerie LAPOUX (Inst.ion CEA-Saclay)

Yury LITVINOV (GSI)
Hongna LIU (TU Darmstadt)
Yohei MATSUDA (Tohoku Univ.)
Kenjiro MIKI (Tohoku Univ.)
Tetsuaki MORIGUCHI (Tsukuba Univ.)
Takashi NAKAMURA (Tokyo Tech)Alexandre OBERTELLI (TU Darmstadt)
Kazuyuki OGATA (Osaka Univ.)
Emanuel POLLACCO (CEA Saclay)
Kimiko SEKIGUCHI (Tohoku Univ.)
Haik SIMON (GSI)
Laszlo STUHL (ATOMKI)
Baohua SUN (Beihang Univ.)
Shinji SUZUKI (Chinese Academy of Sci.)
Satoru TERASHIMA (Beihang Univ.)
Hans Toshihide TOERNQVIST (TU Darmstadt)
Yasuhiro TOGANO (Rikkyo Univ.)
Takashi WAKUI (QST)
He WANG (Tokyo Tech)
Atomu WATANABE (Tohoku Univ.)
Takayuki YAMAGUCHI (Saitama Univ.)
Nobuhiro YANAI (Kyushu Univ.)
Zaihong YANG (Osaka Univ.)
Juzo ZENIHIRO (Kyoto Univ.)
Yuhu ZHANG (IMP, CAS)

Visiting Technicians
Gilles AUTHELET (CEA)
Denis CALVET (CEA)
Alain DELBART (CEA/CE Saclay)
Jean-Marc GHELLER (CEA)
Arnaud GIGANON (CEA/CE Saclay)

Clement HILAIRE (CEA Saclay)
Daniel KOERPER (GSI)
Cedric PERON (CEA Saclay)
Jean-Yves ROUSSE (CEA)
Olivier TELLIER (CEA Saclay)

Student Trainees
Tomoki ADACHI (Kyushu Univ.)
Paul E. ANDRE (CEA Saclay)
Wenbo DOU (Saitama Univ.)
Naoki EBINA (Tokyo Tech)
Shiyo EN’YO (Kyoto Univ.)
Yuki FUJIKAWA (Kyoto Univ.)
Saiya FUJIWARA (Kyushu Univ.)
Jian GAO (Peking Univ.)
Daiki HAMAKAWA (Saitama Univ.)
Yuya HAMANO (Kyushu Univ.)
Sakumi HARAYAMA (Saitama Univ.)
Mika HAYASHI (Tsukuba Univ.)
Yuto HIJIKATA (Kyoto Univ.)
Kouta HORIKAWA (Tokyo Tech)
Kento INABA (Kyoto Univ.)
Minami INOUE (Tohoku Univ.)
Daisuke KAJIKI (Saitama Univ.)
Koki KAMEYA (Tohoku Univ.)
Naoto KANAME (Tsukuba Univ.)
Masanori KANDA (Saitama Univ.)
Yusuke KAWASHIMA (Kyushu Univ.)
Sho KITAYAMA (Tohoku Univ.)

Shuhei KIYOTAKE (Univ. of Miyazaki)
Taishi KUBO (Kyushu Univ.)
Hayato KUROSAWA (Tohoku Univ.)
Hongfu LI (IMP, CAS)
Pengjie LI (The Univ. of Hong Kong)
Ryu MAEDA (Tohoku Univ.)
Yoshiki MARUTA (Tohoku Univ.)
Tomoki MATSUI (Tokyo Tech)
Riku MATSUMURA (Saitama Univ.)
Shinnosuke NAKAI (Tohoku Univ.)
Mio NISHIMURA (Rikkyo Univ.)
Kotaro NONAKA (Univ. of Miyazaki)
Kyoko NOSAKA (Tohoku Univ.)
Shintaro OKAMOTO (Kyoto Univ.)
Misaki OTSU (Saitama Univ.)
Atsumi SAITO (Tokyo Tech)
Yuko SAITO (Tohoku Univ.)
Shigehito SAKAKI (Kyushu Univ.)
Kosuke SAKANASHI (Osaka Univ.)
Hibiki SEKI (Saitama Univ.)
Naru SHINOZAKI (Saitama Univ.)
Kohei TAKAHASHI (Tokyo Tech)- 222 -

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

Keisuke TOMITA (Tsukuba Univ.)
Ryotaro TSUJI (Kyoto Univ.)
Yuta UTSUKI (Tohoku Univ.)
Kohei YAMAMOTO (Tohoku Univ.)

Asahi YANO (Tsukuba Univ.)
Akira YASUDA (Tokyo Tech)
Chieko YONEMURA (Kyushu Univ.)
Yuuki YOSHITOME (Tokyo Tech)

Interns
Maruf ALI (Univ. of Surrey)

George W.G.W. HUDSON-CHANG (Univ. of Surrey)

Assistants
Emiko ISOGAI
Asako TAKAHASHI

Yuri TSUBURAI

List of Publications & Presentations
Publications[Original Papers]
Y. Kubota, A. Corsi, G. Authelet, H. Baba, C. Caesar, D. Calvet, A. Delbart, M. Dozono, J. Feng, F. Flavigny, J. -M. Gheller, J. Gibelin,
A. Giganon, A. Gillibert, K. Hasegawa, T. Isobe, Y. Kanaya, S. Kawakami, D. Kim, Y. Kikuchi, Y. Kiyokawa, M. Kobayashi,
N. Kobayashi, T. Kobayashi, Y. Kondo, Z. Korkulu, S. Koyama, V. Lapoux, Y. Maeda, F. M. Marques, T. Motobayashi, T. Miyazaki,
T. Nakamura, N. Nakatsuka, Y. Nishio, A. Obertelli, K. Ogata, A. Ohkura, N. A. Orr, S. Ota, H. Otsu, T. Ozaki, V. Panin, S. Paschalis,
E. C. Pollacco, S. Reichert, J. -Y. Rousse, A. T. Saito, S. Sakaguchi, M. Sako, C. Santamaria, M. Sasano, H. Sato, M. Shikata,Y. Shimizu, Y. Shindo, L. Stuhl, T. Sumikama, Y. L. Sun, M. Tabata, Y. Togano, J. Tsubota, Z. H. Yang, J. Yasuda, K. Yoneda,
J. Zenihiro, and T. Uesaka, “Surface localization of the dineutron in 11 Li,” Phys. Rev. Lett. 125, 252501 (2020).
A. Revel, O. Sorlin, F. M. Marqués, Y. Kondo, J. Kahlbow, T. Nakamura, N. A. Orr, F. Nowacki, J. A. Tostevin, C. X. Yuan, N. L. Achouri,
H. Al Falou, L. Atar, T. Aumann, H. Baba, K. Boretzky, C. Caesar, D. Calvet, H. Chae, N. Chiga, A. Corsi, H. L. Crawford, F. Delaunay, A. Delbart, Q. Deshayes, Z. Dombrádi, C. A. Douma, Z. Elekes, P. Fallon, I. Gašparić, J. -M. Gheller, J. Gibelin, A. Gillibert,
M. N. Harakeh, W. He, A. Hirayama, C. R. Hoﬀman, M. Holl, A. Horvat, Á. Horváth, J. W. Hwang, T. Isobe, N. Kalantar-Nayestanaki,
S. Kawase, S. Kim, K. Kisamori, T. Kobayashi, D. Körper, S. Koyama, I. Kuti, V. Lapoux, S. Lindberg, S. Masuoka, J. Mayer, K. Miki,
T. Murakami, M. Najafi, K. Nakano, N. Nakatsuka, T. Nilsson, A. Obertelli, F. de Oliveira Santos, H. Otsu, T. Ozaki, V. Panin,
S. Paschalis, D. Rossi, A. T. Saito, T. Saito, M. Sasano, H. Sato, Y. Satou, H. Scheit, F. Schindler, P. Schrock, M. Shikata, Y. Shimizu,
H. Simon, D. Sohler, L. Stuhl, S. Takeuchi, M. Tanaka, M. Thoennessen, H. Törnqvist, Y. Togano, T. Tomai, J. Tscheuschner, J. Tsubota, T. Uesaka, Z. Yang, M. Yasuda, and K. Yoneda, “Extending the southern shore of the island of inversion to 28 F,” Phys. Rev. Lett.
124, 15, 152502 (2020).
M. Dozono, T. Uesaka, N. Fukuda, M. Ichimura, N. Inabe, S. Kawase, K. Kisamori, Y. Kiyokawa, K. Kobayashi, M. Kobayashi, T. Kubo,
Y. Kubota, C. S. Lee, M. Matsushita, S. Michimasa, H. Miya, A. Ohkura, S. Ota, H. Sagawa, S. Sakaguchi, H. Sakai, M. Sasano,S. Shimoura, Y. Shindo, L. Stuhl, H. Suzuki, H. Tabata, M. Takaki, H. Takeda, H. Tokieda, T. Wakasa, K. Yako, Y. Yanagisawa,
J. Yasuda, R. Yokoyama, K. Yoshida, and J. Zenihiro, “The parity-transfer (16 O, 16 F(0− , g.s.)) reaction as a probe of isovector 0− statesin nuclei,” Nucl. Phys. B 962, 115236 (2021).
N. Itagaki, T. Fukui, J. Tanaka, and Y. Kikuchi, “8 He and 9 Li cluster structures in light nuclei,” Phys. Rev. C 102, 024332 (2020).
X. Roca-Maza, G. Colo, and H. Sagawa, “Isobaric analog state energy in deformed nuclei: a toy model,” Phys. Rev. C 102, 064303-1–
8 (2020).
T. Aumann, C. Barbieri, D. Bazin, C. A. Bertulani, A. Bonaccorso, W. H. Dickhoﬀ, A. Gade, M. Gomez-Ramos, B. P. Kay, A. M. Moro,T. Nakamura, A. Obertelli, K. Ogata, S. Paschalis, and T. Uesaka, “Quenching of single-particle strength from direct reactions withstable and rare-isotope beams,” Prog. Part. Nucl. Phys. 118, 103847 (2021).
S. Yoshida, H. Sagawa, J. Zenihiro, and T. Uesaka, “Trajectory in 2D-plot of isoscalar and isovector densities of 48 Ca and 208 Pb, andsymmetry energy,” Phys. Rev. C 102, 064307-1–12 (2020).
M. Patsyuk, J. Kahlbow, G. Laskaris, M. Duer, V. Lenivenko, E. P. Segarra, T. Atovullaev, G. Johansson, T. Aumann, A. Corsi,
O. Hen, M. Kapishin, V. Panin, E. Piasetzky, Kh. Abraamyan, S. Afanasiev, G. Agakishiev, P. Alekseev, E. Atkin, T. Aushev,
V. Babkin, V. Balandin, D. Baranov, N. Barbashina, P. Batyuk, S. Bazylev, A. Beck, C. A. Bertulani, D. Blaschke, D. Blau, D. Bogoslovsky, A. Bolozdynya, K. Boretzky, V. Burtsev, M. Buryakov, S. Buzin, A. Chebotov, J. Chen, A. Ciszewski, R. Cruz-Torres,
B. Dabrowska, D. Dabrowski, A. Dmitriev, A. Dryablov, P. Dulov, D. Egorov, A. Fediunin, I. Filippov, K. Filippov, D. Finogeev,
I. Gabdrakhmanov, A. Galavanov, I. Gasparic, O. Gavrischuk, K. Gertsenberger, V. Golovatyuk, M. Golubeva, F. Guber, Yu. Ivanova,
A. Ivashkin, A. Izvestnyy, S. Kakurin, V. Karjavin, N. Karpushkin, R. Kattabekov, V. Kekelidze, S. Khabarov, Yu. Kiryushin, A. Kisiel,
V. Kolesnikov, A. Kolozhvari, Yu. Kopylov, I. Korover, L. Kovachev, A. Kovalenko, Yu. Kovalev, A. Kugler, S. Kuklin, E. Kulish, A. Kuznetsov, E. Ladygin, N. Lashmanov, E. Litvinenko, S. Lobastov, B. Löher, Y. -G. Ma, A. Makankin, A. Maksymchyuk,
A. Malakhov, I. Mardor, S. Merts, A. Morozov, S. Morozov, G. Musulmanbekov, R. Nagdasev, D. Nikitin, V. Palchik, D. Peresunko, M. Peryt, O. Petukhov, Yu. Petukhov, S. Piyadin, V. Plotnikov, G. Pokatashkin, Yu. Potrebenikov, O. Rogachevsky, V. Rogov,
K. Rosłon, D. Rossi, I. Rufanov, P. Rukoyatkin, M. Rumyantsev, D. Sakulin, V. Samsonov, H. Scheit, A. Schmidt, S. Sedykh, I. Selyuzhenkov, P. Senger, S. Sergeev, A. Shchipunov, A. Sheremeteva, M. Shitenkov, V. Shumikhin, A. Shutov, V. Shutov, H. Simon,
I. Slepnev, V. Slepnev, I. Slepov, A. Sorin, V. Sosnovtsev, V. Spaskov, T. Starecki, A. Stavinskiy, E. Streletskaya, O. Streltsova,
M. Strikhanov, N. Sukhov, D. Suvarieva, J. Tanaka, A. Taranenko, N. Tarasov, O. Tarasov, V. Tarasov, A. Terletsky, O. Teryaev,
V. Tcholakov, V. Tikhomirov, A. Timoshenko, N. Topilin, B. Topko, H. Törnqvist, I. Tyapkin, V. Vasendina, A. Vishnevsky,
N. Voytishin, V. Wagner, O. Warmusz, I. Yaron, V. Yurevich, N. Zamiatin, Song Zhang, E. Zherebtsova, V. Zhezher, N. Zhigareva,- 223 -

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

A. Zinchenko, E. Zubarev, and M. Zuev, “Unperturbed inverse kinematics nucleon knockout measurements with a carbon beam,” Nat.
Phys. 1-7 (2021).
Z. H. Yang, Y. Kubota A. Corsi, K. Yoshida, X. -X. Sun, J. G. Li, M. Kimura, N. Michel, K. Ogata, C. X. Yuan, Q. Yuan, G. Authelet,
H. Baba, C. Caesar,D. Calvet, A. Delbart, M. Dozono, J. Feng, F. Flavigny, J. -M. Gheller, J. Gibelin, A. Giganon, A. Gillibert,
K. Hasegawa, T. Isobe, Y. Kanaya, S. Kawakami, D. Kim, Y. Kiyokawa, M. Kobayashi, N. Kobayashi, T. Kobayashi, Y. Kondo,
Z. Korkulu, S. Koyama, V. Lapoux, Y. Maeda, F. M. Marques, T. Motobayashi, T. Miyazaki, T. Nakamura, N. Nakatsuka, Y. Nishio,
A. Obertelli, A. Ohkura, N. A. Orr, S. Ota, H. Otsu, T. Ozaki, V. Panin, S. Paschalis, E. C. Pollacco, S. Reichert, J. -Y. Rousse,
A. T. Saito, S. Sakaguchi, M. Sako, C. Santamaria, M. Sasano, H. Sato, M. Shikata, Y. Shimizu, Y. Shindo, L. Stuhl, T. Sumikama,
Y. L. Sun, M. Tabata, Y. Togano, J. Tsubota, F. R. Xu, J. Yasuda, K. Yoneda, J. Zenihiro, S. -G. Zhou, W. Zuo, and T. Uesaka,“Quasi-free neutron knockout reaction reveals a smalls-orbital component in the borromean nucleus 17 B,” Phys. Rev. Lett. 126, 082501(2021).
M. Sasano, H. Sagawa, T. Suzuki, and M. Honma, “Energy-weighted sum rule for Gamow-Teller giant resonances in high spin isomericstates of N = Z nuclei,” Phys. Rev. C 103, 014308-1–10 (2021).
J. Tanaka, Z. Yang, S. Typel, S. Adachi, S. Bai, P. van Beek, D. Beaumel, Y. Fujikawa, J. Han, S. Heil, S. Huang, A. Inoue, Y. Jiang,
M. Knösel, N. Kobayashi Y. Kubota, W. Liu, J. Lou, Y. Maeda, Y. Matsuda, K. Miki, S. Nakamura, K. Ogata, V. Panin, H. Scheit,
F. Schindler, P. Schrock, D. Symochko, A. Tamii, T. Uesaka, V. Wagner, K. Yoshida, J. Zenihiro, and T. Aumann, “Formation of α
clusters in dilute neutron-rich matter,” Science 371, 260–264 (2021).
J. Zenihiro, T. Uesaka, S. Yoshida, and H. Sagawa, “Proton density polarization of the doubly magic 40 Ca core in 48 Ca and EoS parameters,” Prog. Theor. Exp. Phys. 2021, 023D05 (2021).
S. Takada, K. Tateishi, Y. Wakabayashi, Y. Ikeda, T. Yoshioka, Y. Otake, and T. Uesaka, “Polarized proton spin filter for epithermal
neutrons based on dynamic nuclear polarization using photo-excited triplet electron spins PTEP 2020,” Prog. Theor. Exp. Phys. 2020,
123G01 (2020).
D. Wu, C. L. Bai, H. Sagawa, and H. Q. Zhang, “Study of charge radii with neural networks,” Phys. Rev. C 102, 054323-1–7 (2020).
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. Niţǎ, 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. Cortes, 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, Zs. Podolyák, J. -Y. Rousse, 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, 94 Se: identification of an oblate K isomerof 94 Se and the ground-state shape transition between N = 58 and 60,” Phys. Rev. Lett. 124, 22, 222501 (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. Peron, A. Peyaud, E. C. Pollacco, J. -Y. Rousse, 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. Cortes, M. Dewald, B. Ding, Zs. Dombradi, F. Flavigny, S. Franchoo, F. Giacoppo, M. Górska, A. Gottardo,
K. Hadyńska-Klȩk, 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, Zs. Podolyák, M. Rudigier, E. Sahin, T. Y. Saito, C. Shand, P. -A. Söderström, I. G. Stefan, T. Sumikama,
D. Suzuki, R. Orlandi, V. Vaquero, Zs. 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. 1251, 012501 (2020).
M. M. Juhász, Z. Elekes, D. Sohler, Y. Utsuno, K. Yoshida, T. Otsuka, K. Ogata, P. Doornenbal, A. Obertelli, H. Baba, F. Browne,
D. Calvet, F. Château, S. Chen, N. Chiga, A. Corsi, M. L. Cortés, A. Delbart, J. -M. Gheller, A. Giganon, A. Gillibert, C. Hilaire,
T. Isobe, T. Kobayashi, Y. Kubotan, V. Lapoux,T. Motobayashi, I. Murray, H. Otsu, V. Panin, N. Paul, W. Rodriguez, H. Sakurai,
M. Sasano, D. Steppenbeck, L. Stuhlo, Y. L. Sun, Y. Togano, T. Uesaka, K. Wimmer, K. Yoneda, N. L. Achouri, O. Aktasu, T. Aumann,
L. X. Chung, Zs. Dombrádi, F. Flavign, S. Franchoo, I. Gašparic, R. -B. Gerst, J. Gibelin, K. I. Hahn, D. Kim, T. Koiwa, Y. Kondo,
P. Koseoglo, J. Lee, C. Lehr, B. D. Linh, H. N. Liu, T. Lokotko, M. MacCormick, K. Moschner, T. Nakamura, S. Y. Park, D. Rossi,
E. Sahina, P. -A. Söderström, S. Takeuchia, H. Törnqvist, V. Vaqueroa, V. Wagner, S. Wanga, V. Werner, X. Xu, H. Yamada, D. Yana,
Z. Yang, and M. Yasuda, “First spectroscopic study of 51 Ar by the (p, 2p) reaction,” Phys. Lett. B 814, 136108 (2021).
W. J. Huang, M. Wang, F. G. Kondev, G. Audi, and S. Naimi, “The AME 2020 atomic mass evaluation (I). Evaluation of input data,
andadjustment procedures,” Chin. Phys. C 45, 030002 (2021).
W. J. Huang, M. Wang, F. G. Kondev, G. Audi, and S. Naimi, “The AME 2020 atomic mass evaluation (II). Tables, graphs and references,”
Chin. Phys. C 45, 3, 030003 (2021).
N. Itagaki, T. Fukui, J. Tanaka, and Y. Kikuchi, “8 He and 9 Li cluster structures in light nuclei,” Phys. Rev. C 102, 024332 (2020).
T. L. Tang, T. Uesaka, S. Kawase, D. Beaumel, M. Dozono, T. Fujii, N. Fukuda, T. Fukunaga, A. Galindo-Uribarri, S. H. Hwang, N. Inabe,
D. Kameda, T. Kawahara, W. Kim, K. Kisamori, M. Kobayashi, T. Kubo, Y. Kubota, K. Kusaka, C. S. Lee, Y. Maeda, H. Matsubara,
S. Michimasa, H. Miya, T. Noro, A. Obertelli, K. Ogata, S. Ota, E. Padilla-Rodal, S. Sakaguchi, H. Sakai, M. Sasano, S. Shimoura,
S. S. Stepanyan, H. Suzuki, M. Takaki, H. Takeda, H. Tokieda, T. Wakasa, T. Wakui, K. Yako, Y. Yanagisawa, J. Yasuda, R. Yokoyama,
K. Yoshida, K. Yoshida, and J. Zenihiro, “How diﬀerent is the core of 25 F from 24 Og.s. ?” Phys. Rev. Lett. 124, 212502 (2020).
W. Horiuchi, Y. Suzuki, T. Uesaka, and M. Miwa, “Total reaction cross section on a deuteron target and the eclipse eﬀect of the constituent
neutron and proton,” Phys. Rev. C 102, 054601 (2020).
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,- 224 -

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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. Gašparić, 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).
D. Nagae, Y. Abe, S. Okada, S. Omika, K. Wakayama, S. Hosoi, S. Suzuki, T. Moriguchi, M. Amano, D. Kamioka, Z. Ge, S. Naimi,
F. Suzaki, N. Tadano, R. Igosawa, K. Inomata, H. Arakawa, K. Nishimuro, T. Fujii, T. Mitsui, Y. Yanagisawa, H. Baba, S. Michimasa,
S. Ota, G. Lorusso, Yu. A. Litvinov, A. Ozawa, T. Uesaka, T. Yamaguchi, Y. Yamaguchi, and M. Wakasugi, “Development andoperation of an electrostatic time-of-flight detector for the Rare RI storage Ring,” Nucl. Instrum. Methods Phys. Res. A 986, 164713(2021).
Y. Zhang, H. Sagawa, and E. Hiyama, “Hyperon halo structure of C and B Isotopes,” Phys. Rev. C 103, 03432-1–9 (2021).
S. Michimasa, M. Kobayashi, Y. Kiyokawa, S. Ota, R. Yokoyama, D. Nishimura, D. S. Ahn, H. Baba, G. P. A. Berg, M. Dozono,
N. Fukuda, T. Furuno, E. Ideguchi, N. Inabe, T. Kawabata, S. Kawase, K. Kisamori, K. Kobayashi, T. Kubo, Y. Kubota, C. S. Lee,
M. Matsushita, H. Miya, A. Mizukami, H. Nagakura, H. Oikawa, H. Sakai, Y. Shimizu, A. Stolz, H. Suzuki, M. Takaki, H. Takeda,
S. Takeuchi, H. Tokieda, T. Uesaka, K. Yako, Y. Yamaguchi, Y. Yanagisawa, K. Yoshida, and S. Shimoura, “Mapping of a new
deformation region around 62 Ti,” Phys. Rev. Lett. 125, 12, 122501 (2020).
C. Y. Fu, Y. H. Zhang, M. Wang X. H. Zhou Yu. A. Litvinov, K. Blaum, H. S. Xu, X. Xu, P. Shuai, Y. H. Lam, R. J. Chen, X. L. Yan,
X. C. Chen, J. J. He, S. Kubono, M. Z. Sun, X. L. Tu, Y. M. Xing, Q. Zeng, X. Zhou, W. L. Zhan, S. Litvinov, G. Audi, T. Uesaka,
T. Yamaguchi, A. Ozawa, B. H. Sun, Y. Sun, and F. R. Xu, “Mass measurements for the T z = −2 fp nuclei 40 Ti, 44 Cr, 46 Mn, 48 Fe, 50 Co,
and 52 Ni,” Phys. Rev. C 102, 5, 054311 (2020).
S. Takada, K. Tateishi, Y. Wakabayashi, Y. Ikeda, T. Yoshioka, Y. Otake, and T. Uesaka, “Polarized proton spin filter for epithermal neutron
based on dynamic nuclear polarization using photo-excited triplet electron spins,” Prog. Theo. Exp. Phys. 2020, 123G01 (2020).

[Review Articles]
K. Nishimura, H. Kouno, Y. Kawashima, K. Orihashi, S. Fujiwara, K. Tateishi, T. Uesaka, N. Kimizuka, and N. Yanai, “Materials
chemistry of triplet dynamic nuclear polarization,” Chem. Commum. 56, 7217–7232 (2020).

[Proceedings]
S. W. Huang, Z. H. Yang, F. M. Marqués, N. L. Achouri, D. S. Ahn, T. Aumann, H. Baba, D. Beaumel, M. Böhmer, K. Boretzky,
M. Caamaño, S. Chen, N. Chiga, M. L. Cortés, D. Cortina, P. Doornenbal, C. A. Douma, F. Dufter, J. Feng, B. Fernández-Domı́nguez,
Z. Elekes, U. Forsberg, T. Fujino, N. Fukuda, I. Gašparić, Z. Ge, R. Gernhäuser, J. M. Gheller, J. Gibelin, A. Gillibert, B. M. Godoy,
Z. Halász, T. Harada, M. N. Harakeh, A. Hirayama, N. Inabe, T. Isobe, J. Kahlbow, N. Kalantar-Nayestanaki, D. Kim, S. Kim,
M. A. Knösel, T. Kobayashi, Y. Kondo, P. Koseoglou, Y. Kubota, I. Kuti, C. Lehr, P. J. Li, Y. Liu, Y. Maeda, S. Masuoka, M. Matsumoto,
J. Mayer, H. Miki, M. Miwa, I. Murray, T. Nakamura, A. Obertelli, N. Orr, H. Otsu, V. Panin, S. Park, M. Parlog, S. Paschalis, M. Potlog,
S. Reichert, A. Revel, D. Rossi, A. Saito, M. Sasano, H. Sato, H. Scheit, F. Schindler, T. Shimada, Y. Shimizu, S. Shimoura, I. Stefan,
S. Storck, L. Stuhl, H. Suzuki, D. Symochko, H. Takeda, S. Takeuchi, J. Tanaka, Y. Togano, T. Tomai, H. T. Törnqvsit, J. Tscheuschner,
T. Uesaka, V. Wagner, K. Wimmer, H. Yamada, B. Yang, L. Yang, Y. Yasuda, K. Yoneda, L. Zanetti, J. Zenihiro, T. Elidiano, andC. Lenain, “Experimental study of 4n with 8 He(p, 2p) reaction,” J. Phys. Conf. Ser. 1643, 012090 (2020).
V. P. Ladygin, A. V. Averyanov, E. V. Chernykh, Y. V. Gurchin, A. Y. Isupov, D. O. Krivenkov, P. K. Kurilkin, N. B. Ladygina, A. N. Livanov, S. M. Piyadin, S. G. Reznikov, Y. T. Skhomenko, A. A. Terekhin, A. V. Tishevsky, and T. Uesaka, “Angular and energy
dependence of Ay , Ayy and A xx analyzing powers in dp elastic scattering and dp breakup reaction investigation,” Proc. Sci. LC2019,048 (2020).
Z. Yang, J. Tanaka, S. Type, T. Aumann, J. Zenihiro, S. Adachi, S. Bai, P. van Beek, D. Beaumel, Y. Fujikawa, J. Han, S. Heil, S. Huang,
A. Inoue, Y. Jia, M. Knösel, N. Kobayashi, Y. Kubota, W. Liu, J. Lou, Y. Maeda, Y. Matsuda, K. Miki, S. Nakamura, K. Ogata, V. Panin,
H. Scheit, F. Schindler, P. Schrock, D. Symochko, A. Tamii, T. Uesaka, V. Wagner, and K. Yoshida, “α-Clustering at the surface of Tin
isotopes 112–124 Sn studied with (p, pα) reaction,” JPS Conf. Proc. 31, 011019 (2020).
P. Koseoglou, V. Werner, N. Pietralla, P. -A. Söderström, P. Doornenbal, A. Obertelli, N. Achouri, 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, H. 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. Auman, L. X. Chung,F. Flavigny, S. Franchoo, I. Gasparic, R. -B. Gerst, J. Gibelin, K. I. Hahn, D. Kim, T. Koiwai, Y. Kondo, J. Lee, C. Lehr, M. Lettmann,
B. D. Linh, T. Lokotko, M. MacCormick, K. Moschner, T. Nakamura, S. Y. Park, D. Rossi, E. Sahin, D. Sohler, S. Takeuchi, H. Toernqvist, V. Vaquero, V. Wagner, S. Wang, X. Xu, H. Yamada, D. Yan, Z. Yang, M. Yasuda, and L. Zanetti, “Spectroscopy of neutron-richscandium isotopes,” J. Phys. Conf. Ser. 1555, 012026 (2020).
R. Matsumura, H. Otsu, H. Wang, N. Chiga, S. Kawase, K. Nakano, H. Sakurai, M. Shikata, S. Takeuchi, Y. Togano, and for the ImPACTRIBF Collaboration, “Research for nuclear transmutation of high-radiotoxic nuclide 90Sr via proton- and deuteron-induced reactions,”
JAEA-Conf. 2021-001(2021).

Presentations[International Conferences/Workshops]
R. Matsumura, H. Otsu, H. Wang, N. Chiga, S. Kawase, K. Nakano, H. Sakurai, M. Shikata, S. Takeuchi, Y. Togano, and for the ImPACTRIBF Collaboration, “Nuclear transmutation of high-radiotoxic nuclide 90 Sr via proton- and deuteron-induced reactions in inverse- 225 -

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

kinematics,” A3F-CNS Summer School 2020, オンライン開催, 2020 年 8 月 17–21 日.
K. Nishimura, H. Kouno, Y. Kawashima, K. Orihashi, S. Fujiwara, K. Tateishi, T. Uesaka, N. Kimizuka, and N. Yanai, “Materials
chemistry of triplet dynamic nuclear polarization,” Chem. Commum. 56, 7217–7232 (2020).

[Domestic Conferences/Workshops]
松村理久, 大津秀暁, 王赫, 千賀信幸, 川瀬頌一郎, 中野敬太, 櫻井博儀, 四方瑞紀, 武内聡, 栂野泰宏, ImPACT-RIBF Collaboration, 「高放射性核種 90 Sr の陽子及び重陽子誘起反応による核変換に向けた研究」, Symposium on Nuclear Data 2020, 埼玉県和光市 (理研
仁科センター), 2020 年 11 月 26–27 日.

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