Ⅵ. ORGANIZATION AND ACTIVITIES OF RNC

RIKEN Accel. Prog. Rep. 56 (2023)

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- 246 -

Ⅵ. ORGANIZATION AND ACTIVITIES OF RNC

RIKEN Accel. Prog. Rep. 56 (2023)

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
corre- sponding to ground and excited levels in 12 Be have been clearly observed. Another double charge exchange reaction, (12 C,
12Be(0+ )) 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
Senior Research Scientists
Masaki SASANO
Ken-ichiro YONEDA

Juzo ZENIHIRO

Research Scientists
Sarah NAIMI

Kenichiro TATEISHI

Research & Development Scientist
Yohei SHIMIZU
Postdoctoral Researcher
Junki TANAKA
Junior Research Associates
Shutaro HANAITomoya HARADAInternational Program Associates
Siwei HUANG

Yutian LI

Research Consultants
Harutaka SAKAGUCHI (Osaka Univ.)
Yasuyuki SUZUKI

Kazuko TANABE- 247 -

Ⅵ. ORGANIZATION AND ACTIVITIES OF RNC

RIKEN Accel. Prog. Rep. 56 (2023)

Senior Visiting Scientist
Hiroyuki SAGAWA (Univ. of Aizu)
Visiting Scientists
Satoshi ADACHI (Osaka Univ.)
Hidetoshi AKIMUNE (Konan Univ.)
Didier BEAUMEL (Inst. de Phys.Nucl.)
Konstanze BORETZKY (GSI)
Anna CORSI (CEA Saclay)
Masanori DOZONO (Kyoto Univ.)
Zoltan ELEKES (ATOMKI)
Zsolt FULOP (ATOMKI)
Tatsuya FURUNO (Osaka Univ.)
Igor GASPARIC (Rudjer Boskovic Inst.)
Valdir GUIMARAES (Inst.o de Fisica da Univ. de Sao Paulo)
Zoltan HALASZ (ATOMKI)
Kaori KAKI (Shizuoka Univ.)
Takahiro KAWABATA (Osaka Univ.)
Yuma KIKUCHI (NIT, Tokuyama College)
Yosuke KONDO (Tokyo Tech)
Zeren KORKULU (Inst. for Basic Sci. (IBS))
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 (Konan Univ.)

Kenjiro MIKI (Tohoku Univ.)
Tetsuaki MORIGUCHI (Tsukuba Univ.)
Sarah NAIMI (IJCLab (Laboratoire de physique des 2 inﬁnis Irene Joliot-Curie))
Takashi NAKAMURA (Tokyo Tech)
Noritsugu NAKATSUKA (Tokyo Tech)Alexandre OBERTELLI (TU Darmstadt)
Kazuyuki OGATA (Osaka Univ.)
Valerii PANIN (GSI)
Aldric REVEL (CEA Saclay)
Kimiko SEKIGUCHI (Tokyo Tech)
Laszlo STUHL (Inst. for Basic Sci. (IBS))
Baohua SUN (Beihang Univ.)
Yelei SUN (TU Darmstadt)
Shinji SUZUKI (Chinese Academy of Sci.)
Satoru TERASHIMA (Beihang Univ.)
Yasuhiro TOGANO (Rikkyo Univ.)
Takashi WAKUI (QST)
Atomu WATANABE (JSPS)
Takayuki YAMAGUCHI (Saitama Univ.)
Zaihong YANG (Osaka Univ.)
Juzo ZENIHIRO (Kyoto Univ.)
Yuhu ZHANG (IMP, CAS)

Visiting Technicians
Denis CALVET (CEA)
Alain DELBART (CEA/CE Saclay)
Clement HILAIRE (CEA Saclay)

Shoji SUZUKI (KEK)
Olivier TELLIER (CEA Saclay)

Student Trainees
Tomoki ADACHI (Kyushu Univ.)
Sota ANDO (Kyushu Univ.)
Paul ANDRE (CEA Saclay)
Naoki EBINA (Tokyo Tech)
Shiyo EN’YO (Kyoto Univ.)
Yuki FUJIKAWA (Kyoto Univ.)
Saiya FUJIWARA (Kyushu Univ.)
Jian GAO (Peking Univ.)
Shutaro HANAI (Univ. of Tokyo)
Sakumi HARAYAMA (Saitama Univ.)
Koshi HIGUCHI (Saitama Univ.)
Kouta HORIKAWA (Tokyo Tech)
Kento INABA (Kyoto Univ.)
Kakeru ISOBE (Tokyo Tech)
Koki KAMEYA (Tohoku Univ.)
Naoto KANAME (Tsukuba Univ.)
Masanori KANDA (Saitama Univ.)
Fumiya KAWAGUCHI (Tokyo Tech)
Yusuke KAWASHIMA (Kyushu Univ.)
Kanki KISHIMOTO (Kyushu Univ.)
Sho KITAYAMA (Tohoku Univ.)
Yukari KOIZUMI (Saitama Univ.)
Hyeji LEE (Tokyo Tech.)
Hongfu LI (IMP, CAS)

Yoshiki MARUTA (Tohoku Univ.)
Takaya MATSUI (Tohoku Univ.)
Tomoki MATSUI (Tokyo Tech)
Riku MATSUMURA (Saitama Univ.)
Atsuyuki MORIYAMA (Tsukuba Univ.)
Shintaro OKAMOTO (Kyoto Univ.)
Kengo OKUBO (Saitama Univ.)
Misaki OTSU (Saitama Univ.)
Yuko SAITO (Tohoku Univ.)
Kosuke SAKANASHI (Osaka Univ.)
Kenta SASAKI (Saitama Univ.)
Hibiki SEKI (Saitama Univ.)
Yusuke SHINOHARA (Kyushu Univ.)
Naru SHINOZAKI (Saitama Univ.)
Kohei TAKAHASHI (Tokyo Tech)Ryotaro TSUJI (Kyoto Univ.)
Ren URAYAMA (Tohoku Univ.)
Kanta YAHIRO (Kyoto Univ.)
Kohei YAMAMOTO (Tohoku Univ.)
Wataru YAMASHITA (Kyushu Univ.)
Asahi YANO (Tsukuba Univ.)
Nozomi YOKOTA (Kyushu Univ.)
Chieko YONEMURA (Kyushu Univ.)
Ryohsuke YOSHIDA (Kyoto Univ.)- 248 -

Ⅵ. ORGANIZATION AND ACTIVITIES OF RNC

RIKEN Accel. Prog. Rep. 56 (2023)

Assistants
Emiko ISOGAI

Yuri TSUBURAI

List of Publications & Presentations
Publications[Original Papers]
V. P. Ladygin, A. V. Averyanov, E. V. Chernykh, D. Enache, Yu. V. Gurchin, A. Yu. Isupov, M. Janek, J. -T. Karachuk, A. N. hrenov,
D. O. Krivenkov, P. K. Kurilkin, N. B. Ladygina, A. N. Livanov, O. Mezhenska, S. M. Piyadin, S. G. Reznikov, Y. T. Skhomenko,
A. A. Terekhin, A. V. Tishevsky, T. Uesaka, and I. S. Volkov, “Deuteron analyzing powers Ay , Ayy , and A xx in d p-elastic scattering atlarge transverse momenta,” JPS Conf. Proc. 37, 020902 (2022).
T. Aumann, W. Bartmann, O. Boine-Frankenheim, A. Bouvard, A. Broche, F. Butin, D. Calvet, J. Carbonell, P. Chiggiato, H. De Gersem,
R. De Oliveira, T. Dobers, F. Ehm, J. Ferreira Somoza, J. Fischer, M. Fraser, E. Friedrich, A. Frotscher, M. Gomez-Ramos, J. L. Grenard, A. Hobl, G. Hupin, A. Husson, P. Indelicato, K. Johnston, C. Klink, Y. Kubota, R. Lazauskas, S. Malbrunot-Ettenauer,
N. Marsic, W. F. O Müller, S. Naimi, N. Nakatsuka, R. Necca, D. Neidherr, G. Neyens, A. Obertelli, Y. Ono, S. Pasinelli, N. Paul,
E. C. Pollacco, D. Rossi, H. Scheit, M. Schlaich, A. Schmidt, L. Schweikhard, R. Seki, S. Sels, E. Siesling, T. Uesaka, M. Vilén,M. Wada, F. Wienholtz, S. Wycech, and S. Zacarias, “PUMA, antiProton unstable matter annihilation,” Eur. Phys. J. A 58, 88 (2022).
V. P. Ladygin, A. V. Averyanov, E. V. Chernykh, D. Enache, Y. V. Gurchi, A. Y. Isupov, M. Janek, J. T. Karachuk, A. N. Khrenov,
D. O. Krivenkov, P. K. Kurilkin, N. B. Ladygina, A. N. Livanov, S. M. Piyadin, S. G. Reznikov, A. A. Terekhin, A. V. Tishevsky, T. Uesaka, and I. S. Volkov, “Angular dependences of the deuteron analyzing powers in elastic d p scattering at large transverse momenta,”
Phys. Part. Nucl. 53, 251 (2022).
M. Duer, T. Aumann, R. Gernhäuser, V. Panin, S. Paschalis, D. M. Rossi, N. L. Achouri, D. Ahn, H. Baba, C. A. Bertulani, M. Böhmer,
K. Boretzky, C. Caesar, N. Chiga, A. Corsi, D. Cortina-Gil, C. A. Douma, F. Dufter, Z. Elekes, J. Feng, B. Fernández-Domı́nguez,
U. Forsberg, N. Fukuda, I. Gasparic, Z. Ge, J. M. Gheller, J. Gibelin, A. Gillibert, K. I. Hahn, Z. Halász, M. N. Harakeh, A. Hirayama,
M. Holl, N. Inabe,T. Isobe, J. Kahlbow, N. Kalantar-Nayestanaki, D. Kim, S. Kim, T. Kobayashi, Y. Kondo, D. Körper, P. Koseoglou,
Y. Kubota, I. Kuti, P. J. Li, C. Lehr, S. Lindberg, Y. Liu,F. M. Marqués, S. Masuoka, M. Matsumoto, J. Mayer, K. Miki, B. Monteagudo,
T. Nakamura, T. Nilsson, A. Obertelli, N. A. Orr, H. Otsu, S. Y. Park, M. Parlog, P. M. Potlog, S. Reichert, A. Revel, A. T. Saito,
M. Sasano, H. Scheit, F. Schindler, S. Shimoura, H. Simon, L. Stuhl, H. Suzuki, D. Symochko, H. Takeda, J. Tanaka, Y. Togano,
T. Tomai, H. T. Törnqvist, J. Tscheuschner, T. Uesaka, V. Wagner, H. Yamada, B. Yang, L. Yang, Z. H. Yang, M. Yasuda, K. Yoneda,
L. Zanetti, J. Zenihiro and M. V. Zhukov, “Observation of a correlated free four-neutron system,” Nature 606, 678 (2022).
A. I. Stefanescu, V. Panin, L. Trache, T. Motobayashi, H. Otsu, A. Saastamoinen, T. Uesaka, L. Stuhl, J. Tanaka, D. Tudor, I. C. Stefanescu,
A. E. Spiridon, K. Yoneda, H. Baba, M. Kurokawa, Y. Togano, Z. Halasz, M. Sasano, S. Ota, Y. Kubota, D. S. Ahn, T. Kobayashi,
Z. Elekes, N. Fukuda, H. Takeda, D. Kim, E. Takada, H. Suzuki, K. Yoshida, Y. Shimizu, H. N. Liu, Y. L. Sun, T. Isobe, J. Gibelin,
P. J. Li, J. Zenihiro, F. M. Marqués, M. N. Harakeh, G. G. Kiss, A. Kurihara, M. Yasuda, T. Nakamura, S. Park, Z. Yang, T. Harada,
M. Nishimura, H. Sato, I. S. Hahn, K. Y. Chae, J. M. Elson, L. G. Sobotka, and C. A. Bertulani, “Silicon tracker array for RIB
experiments at SAMURAI,” Eur. Phys. J. A 58, 223 (2022).
M. Enciu, H. N. Liu, A. Obertelli, P. Doornenbal, F. Nowacki, K. Ogata, A. Poves, K. Yoshida, N. L. 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, 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, 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, P. J. Li,
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,“Extended p3/2 Neutron Orbital and the N = 32 Shell Closure in 52 Ca ,” Phys. Rev. Lett. 129, 262501 (2022).
T. Nishi, K. Itahashi, D. Ahn, G. P. A. Berg, M. Dozono, D. Etoh, H. Fujioka, Naoki Fukuda, N. Fukunishi, H. Geissel, E. Haettner, T. Hashimoto, R. S. Hayano, S. Hirenzaki, H. Horii, N. Ikeno, N. Inabe, M. Iwasaki, D. Kameda, K. Kisamori, Y. Kiyokawa,
T. Kubo, K. Kusaka, M. Matsushita, S. Michimasa, G Mishima, H. Miya, D. Murai, H. Nagahiro, M. Niikura, N. N. -Togawa, S. Ota,
N. Sakamoto, K. Sekiguchi, Y. Shiokawa, H. Suzuki, K. Suzuki, M. Takaki, H. Takeda, Y. K. Tanaka, T. Uesaka, Y. Wada, A. Watanabe,
Y. N. Watanabe, H. Weick, H. Yamakami, Y. Yanagisawa, K. Yoshida, and piAF Collaboration, “Chiral symmetry restoration at highmatter density observed in pionic atoms,” Nat. Phys. 19, 788–793 (2023). DOI:10.1038/s41567-023-02001-x .
Y. Kawashima, T. Hamachi, A. Yamauchi, K. Nishimura, Y. Nakashima, S. Fujiwara, N. Kimizuka, T. Ryu, T. Tamura, M. Saigo, K. Onda,
S. Sato, Y. Kobori, K. Tateishi, T. Uesaka, G. Watanabe, K. Miyata and N. Yanai, “Singlet ﬁssion as a polarized spin generator for
dynamic nuclear polarization,” Nat. Commun. 14, 1056 (2023).
K. Nishimura, R. Yabuki, T. Hamachi, N. Kimizuka, K. Tateishi, T. Uesaka, and N. Yanai, “Dynamic electron polarization lasting morethan 10 µs by hybridizing porphyrin and TEMPO with ﬂexible linkers,” J. Phys. Chem. B 127, 1219 (2023).
H. F. Li, S. Naim, T. M. Sprouse, M. R. Mumpower, Y. Abe, Y. Yamaguchi, D. Nagae, F. Suzaki, M. Wakasugi, H. Arakawa, W. B. Dou,
D. Hamakawa, S. Hosoi, Y. Inada, D. Kajiki, T. Kobayashi, M. Sakaue, Y. Yokoda, T. Yamaguchi, R. Kagesawa, D. Kamioka,
T. Moriguchi, M. Mukai, A. Ozawa, S. Ota, N. Kitamura, S. Masuoka, S. Michimasa, H. Baba, N. Fukuda, Y. Shimizu, H. Suzuki,
H. Takeda, D. S. Ahn, M. Wang, C. Y. Fu, Q. Wang, S. Suzuki, Z. Ge, Yu. A. Litvinov, G. Lorusso, P. M. Walker, Zs. Podolyak, andT. Uesaka, “First application of mass measurements with the Rare-RI Ring reveals the solar r-process abundance trend at A = 122 andA = 123,” Phys. Rev. Lett. 128, 152701 (2022).
S. Kaur, R. Kanungo, W. Horiuchi, G. Hagen, J. D. Holt, B. S. Hu, T. Miyagi, T. Suzuki, F. Ameil, J. Atkinson, Y. Ayyad, S. Bagchi,
D. Cortina-Gil, I. Dillmann, A. Estradé, A. Evdokimov, F. Farinon, H. Geissel, G. Guastalla, R. Janik, R. Knöbel, J. Kurcewicz,- 249 -

Ⅵ. ORGANIZATION AND ACTIVITIES OF RNC

RIKEN Accel. Prog. Rep. 56 (2023)

Y. A. Litvinov, M. Marta, M. Mostazo, I. Mukha, C. Nociforo, H. J. Ong, T. Otsuka, S. Pietri, A. Prochazka, C. Scheidenberger,
B. Sitar, P. Strmen, M. Takechi, J. Tanaka, I. Tanihata, S. Terashima, J. Vargas, H. Weick, and J. S. Winﬁeld, “Proton distribution radiiof 16–24 O: signatures of new shell closures and neutron skin,” Phys. Rev. Lett. 129, 142502 (2022).
K. Yoshida and J. Tanaka, “α knockout reaction as a new probe for α formation in α-decay,” Phys. Rev. C 106, 014621 (2022).
H. Sagawa, S. Yoshida, T. Naito, T. Uesaka, J. Zenihiro, J. Tanaka, and T. Suzuki, “Isovector density and isospin impurity in 40 Ca,” Phys.
Lett. B 829, 137072 (2022).
M. Heil, A. Kelić-Heil, L. Bott, T. Almusidi, H. Alvarez-Pol, L. Atar, L. Atkins, T. Aumann, J. Benlliure, K. Boretzky, B. Brückner,
P. Cabanelas, C. Caesar, E. Casarejos, J. Cederkall, L. Chulkov, A. Corsi, J. Dueñas, P. Erbacher, S. E. Rodriguez, A. Falduto, M. Feijoo, A. Frotscher, J. Frühauf, I. Gašparić, M. J. G. Borge, J. Gerbig, R. Gernhäuser, M. Gilbert, J. Glorius, B. Gnoﬀo, K. Göbel,
D. G. Caamaño, A. Grein, A. -L. Hartig, H. Heggen, M. Heine, A. Heinz, M Holl, I. Homm, A. Horvat, H. T. Johansson, B. Jonson,
N. Kalantar-Nayestanaki, A. Kamenyero, A. Khodaparast, O. Kiselev, P. Klenze, M. Knösel, K. Koch, D. Körper, T Kröll, D Kurtulgil,
N Kurz, B Löher, C Langer, C Lehr, Y Litvinov, H Liu, S Murillo Morales, E Nácher, T Nilsson, J Park, S. Paschalis, L. Pellegri,
A. Perea, M. Petri, T. Pohl, L. Ponnath, R. Popočovski, R. Reifarth, H. -B. Rhee, J. L. Sanchez, D. Rossi, C. Sürder, A. M. SánchezBenı́tez, D. Savran, H. Scheit, H. Simon, Z. Slavkovská, S. Storck-Dutine, Y. Sun, H. T. Törnqvist, J. Tanaka, O. Tengblad, B. Thomas,
L. Varga, M. Volknandt, V. Wagner, F. Wamers, L. Zanetti, “A new Time-of-ﬂight detector for the R3B setup,” Eur. Phys. J. A 58, 248(2022).
T. Koiwai, K. Wimmer, P. Doornenbal, A. Obertelli, C. Barbieri, T. Duguet, J. Holt, T. Miyagi, P. Navrátil, K. Ogata, N. Shimizu,
V. Somà, Y. Utsuno, K. Yoshida, N. Achouri, H. Baba, F. Browne, D. Calvet, F. Château, S. Chen, N. Chiga, A. Corsi, M. 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. Sun, Y. Togano, T. Uesaka,
K. Yoneda, O. Aktas, T. Aumann, L. Chung, F. Flavigny, S. Franchoo, I. Gasparic, R. -B. Gerst, J. Gibelin, K. Hahn, D. Kim, Y. Kondo,
P. Koseoglou, J. Lee, C. Lehr, B. Linh, T. Lokotko, M. MacCormick, K. Moschner, T. Nakamura, S. 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, “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 Croma, M. Assi’ea, Y. Blumenfelda, J. Guillota, H. Sagawab, T. Suzukic, M. Honmab, N. L. Achourid, B. Bastine, R. Borceaf,
W. N. Catfordg, E. Cl’emente, L. C’acerese, M. Caama’noh, A. Corsii, G. De Francee, F. Delaunayd, N. De S’er’evillea, B. FernandezDominguezh, M. Fisichellaj, S. Franchooa, A. Georgiadoua, J. Gibelind, A. Gilliberti, F. Hammachea, O. Kamaloue, A. Knaptong,
V. Lapouxi, S. Leblondd, A. O. Macchiavellik, F. M. Marqu’esd, A. Mattag, L. M’enagere, P. Morfouacea, N. A. Orrd, J. Pancine,
X. Pereira-Lopezd,h, L. Perrota, J. Piote, E. Pollaccoi, D. Ramos, T. Rogere, F. Rotaruf, A. M. S’anchez-Ben’ıtezl, M. S’enovillei,
O. Sorline, M. Stanoiuf, I. Stefana, C. Stodele, D. Suzukia, J. -C. Thomase, and M. Vandebrouck, “Neutron-proton pairing in the N = Z
radioactive f p-shell nuclei 56 Ni and 52 Fe probed by pair transfer,” Phys. Lett. B 829, 137057 (2022).
Y. Tanimura, H. Sagawa, T. Sun, and E. Hiyama, “Xi hypernuclei 15 XiC, 12 XiBe and Xi-N two-body interaction,” Phys. Rev. C 105,
044324 (2022).
M. J. Yang, C. L. Bai, H. Sagawa, and H. Q. Zhang, “The Gamow-Teller transitions in magic nuclei calculated by the charge-exchange
subtracted second random phase approximation,” Phys. Rev. C 106, 014319 (2022).
J. -Y. Xu, Z. -Z. Li, B. -H. Sun, Y. -F. Niu, X. Roca-Maza, H. Sagawa, and I. Tanihata, “Constraining equation of state of nuclear matterby charge-changing cross section measurements of mirror nuclei,” Phys. Lett. B 833, 137333 (2022).
K. Hagino and H. Sagawa, “Spatial correlation of a particle-hole pair with a repulsive isovector interaction,” Phys. Phys. C 106, 034313(2022).
T. Naito, X. Roca-Maza, G. Colo, H. Liang, and H. Sagawa, “Isospin symmetry breaking in the charge radius diﬀerence of mirror nuclei,”
Phys. Rev. C 106, L061306 (2022).
M. J. Yang, H. Sagawa, C. L. Bai, and H. Q. Zhang, “Eﬀects of two particle-two hole conﬁgurations and tensor force on beta decay ofmagic nuclei,” Phys. Rev. C 107, 014325 (2023).
N. Matsumoto, K. Nishimura, N. Kimizuka, Y. Nishiyama, K. Tateishi, T. Uesaka, and N. Yanai, “Proton hyperpolarization relay fromnanocrystals to liquid water,” J. Am. Chem. Soc. 144, 18023 (2022).
T. Furuno, T. Doi, K. Himi, T. Kawabata, S. Adachi, H. Akimune, S. Enyo, Y. Fujikawa, Y. Hijikata, K. Inaba, M. Itoh, S. Kubono,
Y. Matsuda, I. Murat, M. Murata, S. Okamoto, K. Sakanash, and S. Tamaki, “Measurement of 12 C(n, n′ ) reaction cross section todetermine triple-alpha reaction rate in high-density environments,” EPJ Web Conf. 260, 11010 (2022).
M. Abdullah, S. Bagchi, M. N. Harakeh, and the E497 collaboration, “Eﬀect of ground-state shape deformation on the isoscalar giant
monopole resonance in Nd isotopes,” Proc. DAE Symp. Nucl. Phys. 66, 94 (2022).

Presentations[International Conferences/Workshops]
H. Sagawa (invited), “What can we learn from the nuclear ground state densities?,” 6th Topical Workshop on Modern Aspects in Nuclear
Stracutre, Bormio, Italy, February 6–11, 2022.
H. Sagawa (invited), “Beyond mean ﬁeld model for nuclear collective states,” The 16th International Symposium on Origin of Matter and
Evolution of Galaxies (OMEG2022), Hanoi, Vietnam, October 25–28, 2022.
H. Sagawa (invited), “What can we learn from the nuclear ground state densities?,” Physics of RI: Recent progress andperspectives,
RIKEN, Saitama, Japan, May 30–June 1, 2022.
H. Sagawa (oral), “Some topics of isoscalar spin-triplet pairing,” YIPQS long-term workshop, “Mean-ﬁeld and cluster dynamics in nuclear
systems 2022 (MCD2022), Kyoto University, Kyoto, May 9–June 17, 2023.

- 250 -

Ⅵ. ORGANIZATION AND ACTIVITIES OF RNC

RIKEN Accel. Prog. Rep. 56 (2023)

H. Sagawa (invited), “What can we learn from the nuclear ground state densities?,” Focus Program: A quest for exotica in rare-earth
elements, Pohang, Korea, August 22–26, 2022.
J. Tanaka (invited), “Clustering phenomena in dilute neutron-rich matter,” The 15th Asia Paciﬁc Physics Conference (APPC15) August
21–26, 2022.
Y. Kubota (invited), “Surface localization of the dineutron in nuclei,” in Halo Week 2022, Bergen, Norway, 2022.
Y. Kubota (oral), “Recent updates on SAMURAI18 experiment,” in SAMURAI International Collaboration Workshop 2022, Ookayama,
Japan, 2022.
Y. Kubota (oral), “SAMURAI: Recent advances in analysis and prospects for future experiments,” in RIBF Users Meeting 2022.
Y. Hijikata (oral), “Developmetn of gaseous Xe scintillator for particle identiﬁcation of high-intensity RI beams,” The 2022 Annual
Meeting of the JSPS/NSFC/NRF A3 Foresight Program, Osaka, Japan, February 14, 2023.
T. Tsuji (oral), “Development of TOGAXSI array,” SAMURAI International Collaboration Workshop 2022, Meguro-ku, Tokyo (Tokyo
titech University), September 2–3, 2022.
T. Tsuji (oral), “Development of large GAGG:Ce calorimeter for measurements of the cluster knockout reactions,” A3 Foresight Annual
Meeting 2022, Osaka, Japan (OsakaInternational Convention Center), February 13–15, 2023.
T. Uesaka (invited), “Clustering in heavy nuclei probed with knockout reactions,” 6th Topical Workshop on Modern Aspects in Nuclear
Stracutre, Bormio, Italy, February 6–11, 2022.
T. Uesaka (invited), “Recent progress in nuclear cluster physics,” 28th International Nuclear Physics Conference (INPC 2022), Cape town,
South Africa, September 11–16, 2022.
T. Uesaka (invited), “ONOKORO project—knockout reaction studies of clusters in heavy nuclei—,” Direct Reactions with Exotic Beams(DREB2022), Santiago de Compostela, Spain, June 26–July 1, 2022.
J. Tanaka (poster), “Detector array TOGAXSI for inverse-kinematics cluster and nucleon knockout reaction experiment,” EMIS 2022,
Daejeon, Korea, October 3–7, 2022.
Y. Hijikata (poster), “Development of gaseous Xe scintillator for particle identiﬁcation of high-intensity and heavy-ion beams,” EMIS
2022, Daejeon, Korea, October 3–7, 2022.
R. Tsuji (poster) , “Development of large GAGG:Ce calorimeter for measurements of the cluster knockout reactions,” EMIS2022, Dejean,
Korea, October 3–7, 2022.
K. Higuchi (poster), “Development of silicon-strip for cluster knockout reactions,” EMIS2022, Daejon, Korea, October 3–7, 2022.

[Domestic Conferences/Workshops]

田中純貴（招待講演）, 「原子核基底状態のアルファクラスターと ONOKORO プロジェクト」, 日本物理学会 2023 年春季大会, シンポジウム講演, 2023 年 3 月 22–25 日.
久保田悠樹（招待講演）, 「ノックアウト反応で調べるボロミアン核のダイニュートロン相関」, RCNP 研究会「微視的系と巨視的系における核子対凝縮相」, 茨木市 (大阪大学核物理研究センター), 2022 年 9 月 26–28 日.
立石健一郎（口頭論文）, 「トリプレット DNP による室温核偏極: 原理・装置・現状の課題」, DNP 研究会, 豊中市 (大阪大学南部
陽一郎ホール), 2022 年 7 月 12 日.
立石健一郎（口頭論文）, 「核スピン偏極技術とその応用」, 第４回若手放談会: エキゾチック核物理の将来, 神戸市 (理研神戸), 2023
年 3 月 15–17 日.
立石健一郎（口頭論文）, 「Development of High-temperature Nuclear Polarization Method for Hypersensitive NMR Spectroscopy」,
Frontier of Dynamic Structural Biology, 吹田市 (大阪大学), 2022 年 10 月 17–18 日.
土方佑斗（口頭論文）, 「錫 112 の弾性散乱と錫同位体でのアイソスカラー・アイソベクトル密度分布変化」, おのころ戸隠夏合宿,
長野市 (JA 長野県ビル), 2022 年 7 月 29–31 日.
樋口浩志（口頭論文）, 「クラスターノックアウト反応に向けた荷電粒子用シリコン・ストリップ検出器の開発」, 日本物理学会 2022
年春季大会, 2022 年 3 月 15–18 日.
樋口浩志（口頭論文）, 「Strip-Si detector performance report from HIMAC exp」, おのころプロジェクトローカルコラボレーション
ミーティング, 京都市, 2022 年 5 月 19–20 日.
樋口浩志（口頭論文）, 「TOGAXSI で調べる核内クラスターのシェル構造」, おのころプロジェクト戸隠夏合宿, 長野市 (JA 長野県ビル), 2022 年７月 29–30 日.
辻崚太郎（口頭論文）, 「GAGG(Ce) performance; report from HIMAC exp」, おのころプロジェクトローカルコラボレーションミー
ティング, 京都市, 2022 年 5 月 19–20 日.
辻崚太郎（口頭論文）, 「40–52 Ca(p, pX) とクラスター種の同位体依存性」, おのころプロジェクト戸隠夏合宿, 長野市 (JA 長野県ビル), 2022 年 07 月 29–30 日.
土方佑斗（ポスター）, 「原子核実験の先端データ収集システム—標準化と将来—」, 茨木市 (大阪大学 RCNP), 2023 年 3 月 16 日.

Awards

久保田悠樹, 第 29 回 原子核談話会新人賞.
久保田悠樹, 第 17 回 日本物理学会若手奨励賞.

Other

土方佑斗（パネルディスカッション）, 「原子核実験の先端データ収集システム—標準化と将来—」, 茨木市（大阪大学 RCNP）, 2023
年 3 月 16 日.

- 251 -