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

Research Facility Development Division
Research Instruments GroupBigRIPS Team
1. Abstract

This team is in charge of design, construction, development and operation of BigRIPS in-flight separator and its related research
instruments at RI beam factory (RIBF). They are employed not only for the production of RI beams but also the experimental studies
using RI beams.

2. Major Research Subjects

Design, construction, development and operation of BigRIPS in-flight separator, RI-beam transport lines, and their related research
instruments.

3. Summary of Research Activity

This team is in charge of design, construction, development and operation of BigRIPS in-flight separator, RI-beam transport lines,
and their related research instruments such as ZeroDegree spectrometer at RI beam factory (RIBF). They are employed not only forthe production of RI beams but also various kinds of experimental studies using RI beams. The research subjects may be summarized
as follows:(1) General studies on RI-beam production using in-flight scheme.
(2) Studies on ion-optics of in-flight separators, including particle identification of RI beams.
(3) Simulation and optimization of RI-beam production.
(4) Development of beam-line detectors and their data acquisition system.
(5) Experimental studies on production reactions and unstable nuclei.
(6) Experimental studies of the limits of nuclear binding.
(7) Development of superconducting magnets and their helium cryogenic systems.
(8) Development of a high-power production target system.
(9) Development of a high-power beam dump system.
(10) Development of a remote maintenance and remote handling systems.
(11) Operation, maintenance and improvement of BigRIPS separator system, RI-beam transport lines, and their related research
instruments such as ZeroDegree spectrometer and so on.
(12) Experimental research using RI beams.

Members
Team Leader
Koichi YOSHIDA
Research/Technical Scientists
Yoshiyuki YANAGISAWA (Senior Research Scientist)
Naohito INABE (Senior Technical Scientist)
Kensuke KUSAKA (Senior Technical Scientist)
Masao OHTAKE (Senior Technical Scientist)

Naoki FUKUDA (Technical Scientist)
Yohei SHIMIZU (Technical Scientist)
Hiroshi SUZUKI (Technical Scientist)
Hiroyuki TAKEDA (Technical Scientist)

Postdoctoral Researcher
Masahiro YOSHIMOTO
Visiting Scientists
Deuk Soon AHN (Korea Basic Sci. Inst.)
Alan Matthew AMTHOR (Bucknell Univ.)
Daniel P. BAZIN (Michigan State Univ.)
Alfredo ESTRADE VAZ (Central Michigan Univ.)
Michael FAMIANO (Western Michigan State Univ.)
Hans GEISSEL (GSI)
Tuomas Arne Santeri GRAHN (Univ. of Jyvaskyla)
Kazuo IEKI (Rikkyo Univ.)

Naohito IWASA (Tohoku Univ.)
Yutaka MIZOI (Univ. of Electro-Commun.)
Sadao MOMOTA (Kochi Univ. Tech.)David MORRISSEY (Michigan State Univ.)
Mauricio PORTILLO (Michigan State Univ.)
Bradley M. SHERRILL (Michigan State Univ.)
Oleg TARASOV (Michigan State Univ.)

Student Trainee
Shunki ISHIKAWA (Tohoku Univ.)- 278 -

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

List of Publications & Presentations
Publications[Original Papers]
V. Vaquero, A. Jungclaus, T. Aumann, J. Tscheuschner, E. V. Litvinova, J. A. Tostevin, H. Baba, D. S. Ahn, R. Avigo, K. Boretzky,
A. Bracco, C. Caesar, F. Camera, S. Chen, V. Derya, P. Doornenbal, J. Endres, N. Fukuda, U. Garg, A. Giaz, M. N. Harakeh, M. Heil,
A. Horvat, K. Ieki1, N. Imai, N. Inabe, N. Kalantar-Nayestanaki, N. Kobayashi, Y. Kondo, S. Koyama, T. Kubo, I. Martel, M. Matsushita, B. Million, T. Motobayashi, T. Nakamura, N. Nakatsuka, M. Nishimura, S. Nishimura, S. Ota, H. Otsu, T. Ozaki, M. Petri,
R. Reifarth, J. L. Rodrı́guez-Sánchez, D. Rossi, A. T. Saito, H. Sakurai, D. Savran, H. Scheit, F. Schindler, P. Schrock, D. Semmler, Y. Shiga, M. Shikata, Y. Shimizu, H. Simon, D. Steppenbeck, H. Suzuki, T. Sumikama, D. Symochko, I. Syndikus, H. Takeda,
S. Takeuchi, R. Taniuchi1, Y. Togano1, J. Tsubota, H. Wang, O. Wieland, K. Yoneda, J. Zenihiro, and A. Zilges, “Fragmentation of
single-particle strength around the doubly magic nucleus 132 Sn and the position of the 0 f5/2 proton-hole state in 131 In,” Phys. Rev. Lett.
124, 022501 (2020).
M. Tanaka, M. Takechi, A. Homma, M. Fukuda, D. Nishimura, T. Suzuki, Y. Tanaka, T. Moriguchi, D. S. Ahn, A. Aimaganbetov,
M. Amano, H. Arakawa, S. Bagchi, K. -H. Behr, N. Burtebayev, K. Chikaato, H. Du, S. Ebata, T. Fujii, N. Fukuda, H. Geissel, T. Hori,
W. Horiuchi, S. Hoshino, R. Igosawa, A. Ikeda, N. Inabe, K. Inomata, K. Itahashi, T. Izumikawa, D. Kamioka, N. Kanda, I. Kato,
I. Kenzhina, Z. Korkulu, Y. Kuk, K. Kusaka, K. Matsuta, M. Mihara, E. Miyata, D. Nagae, S. Nakamura, M. Nassurlla, K. Nishimuro,
K. Nishizuka, K. Ohnishi, M. Ohtake, T. Ohtsubo, S. Omika, H. J. Ong, A. Ozawa, A. Prochazka, H. Sakurai, C. Scheidenberger,
Y. Shimizu, T. Sugihara, T. Sumikama, H. Suzuki, S. Suzuki, H. Takeda, Y. K. Tanaka, I. Tanihata, T. Wada, K. Wakayama, S. Yagi,
T. Yamaguchi, R. Yanagihara, Y. Yanagisawa, K. Yoshida, and T. K. Zholdybayev, “Swelling of doubly magic 48 Ca core in Ca isotopes
beyond N = 28,” Phys. Rev. Lett. 124, 102501 (2020).
F. Boulay, G. S. Simpson, Y. Ichikawa, S. Kisyov, D. Bucurescu, A. Takamine, D. S. Ahn, K. Asahi, H. Baba, D. L. Balabanski,
T. Egami, T. Fujita, N. Fukuda, C. Funayama, T. Furukawa, G. Georgiev, A. Gladkov, M. Hass, K. Imamura, N. Inabe, Y. Ishibashi,
T. Kawaguchi, T. Kawamura, W. Kim, Y. Kobayashi, S. Kojima, A. Kusoglu, R. Lozeva, S. Momiyama, I. Mukul, M. Niikura, H. Nishibata, T. Nishizaka, A. Odahara, Y. Ohtomo, D. Ralet, T. Sato, Y. Shimizu, T. Sumikama, H. Suzuki, H. Takeda, L. C. Tao, Y. Togano,
D. Tominaga, H. Ueno, H. Yamazaki, X. F. Yang, and J. M. Daugas, “g Factor of the 99 Zr (7/2+ ) isomer: monopole evolution in the
shape-coexisting region,” Phys. Rev. Lett. 124, 112501 (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).
K. J. Cook, T. Nakamura, Y. Kondo, K. Hagino, K. Ogata, A. T. Saito, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, Q. Deshayes,
P. Doornenbal, N. Fukuda, J. Gibelin, J. W. Hwang, N. Inabe, T. Isobe, D. Kameda, D. Kanno, S. Kim, N. Kobayashi, T. Kobayashi,
T. Kubo, S. Leblond, J. Lee, F. M. Marqués, R. Minakata, T. Motobayashi, K. Muto, T. Murakami, D. Murai, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, N. A. Orr, H. Otsu, H. Sato, Y. Satou, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda,
S. Takeuchi,1, R. Tanaka, Y. Togano, J. Tsubota, A. G. Tuﬀ, M. Vandebrouck, and K. Yoneda, “Halo structure of the neutron-dripline
nucleus 19 B,” Phys. Rev. Lett. 124, 212503 (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. Nakamura1, 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).
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. Lee1,
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, 122501 (2020).
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. Łukasik, J. Manfredi,A. B. McIntosh, P. Morfouace, T. Nakamura, N. Nakatsuka, S. Nishimura, R. Olsen, H. Otsu, P. Pawłowski, 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. M. Koo, J. Mohs, D. Oliinychenko, A. Ono, J. Su,
Y. J. Wang, H. Wolter, J. Xu, Y. -X. Zhang, Z. Zhang, the TMEP collaboration, “Symmetry energy investigation with pion production
from Sn + Sn systems,” Phys. Lett. B 813, 136016 (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).

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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. Carrol,
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, Zs. 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 inthe triaxial degree of freedom,” Phys. Rev. C 101, 044311 (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. Söderström, 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. Park, R. Krücken, A. Blazhev, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, P. Boutachkov,
F. Browne, 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. Pate, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaﬀner, Y. Shimizu, L. Sinclair,
P. -A. Söderström, and K. Steiger, “Spectroscopy of 99 Cd and 101 In from β decays of 99 In and 101 Sn,” Phys. Rev. C 102, 014304 (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. Estrade1, 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. Podolyák, 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-Dobón, and Z. Y. Xu, “Isomeric and β-decay spectroscopy of 173, 174 Ho,”
Phys. Rev. C 102, 024301 (2020).
A. Jungclaus, J. M. Keatings, G. S. Simpson, H. Naı̈dja, A. Gargano, S. Nishimura, P. Doornenbal, G. Gey, G. Lorusso, P. -A. Söderström,
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. Li1, H. Sakurai, H. Schaﬀner, Y. Shimizu, H. Suzuki, H. Takeda,
Z. Vajta1, H. Watanabe, J. Wu1, A. Yagi, K. Yoshinaga, S. Bönig, J. -M. Daugas, R. Gernhäuser, S. Ilieva, T. Kröll, A. MontanerPiza, K. Moschner, D. Mücher, H. Nishibata, A. Odahara1, 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).
H. Suzuki, K. Yoshida, N. Fukuda, H. Takeda, Y. Shimizu, D. S. Ahn, T. Sumikama, N. Inabe, T. Komatsubara, H. Sato, Z. Korkulu,
K. Kusaka, Y. Yanagisawa, M. Ohtake, H. Ueno, T. Kubo, S. Michimasa, N. Kitamura, K. Kawata, N. Imai, O. B. Tarasov, D. Bazin,
J. Nolen, and W. F. Henning, “Experimental studies of the two-step scheme with an intense radioactive 132 Sn beam for next-generation
production of very neutron-rich nuclei,” Phys. Rev. C 102, 064615 (2020).
J. Giovinazzo, T. Goigoux, B. Blank, P. Ascher, M. Gerbauxa, S. Grévy, T. Kurtukian-Nieto, C. Magron, P. Doornenbal, N. Fukuda,
N. Inabe, G. G. Kiss, T. Kubo, S. Kubono, S. Nishimura, H. Sakurai, Y. Shimizu, C. Sidong, P. -A. Söderström, T. Sumikama,
H. Suzuki, H. Takeda, P. Vi, J. Wu, D. S. Ahn, J. Agramunt, A. Algora, V. Guadilla, A. Montaner-Piza, A. I. Morales, S. E. A. 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. B. Cakirli, E. Ganioglu, J. Chiba, D. Nishimura, H. Oikawa, Y. Takei, S. Yagi, K. Wimmer, G. de France, S. Go, and B. A. Brown,“Two-proton radioactivity: the interesting case of 67 Kr and further studies,” Acta Physica Polonica B 51, 577 (2020).
A. Vitéz-Sveiczer, A. Algora, A. I. Morales, B. Rubio, G. G. Kiss, G. de Angelis, F. Recchia, S. Nishimura, J. Agramunt, V. Guadilla,
A. Montaner-Pizá, S. E. A. Orrigo, A. Horváth, D. Napoli, S. Lenzi, A. Boso, V. H. Phong, J. Wu, P. -A. Söderström, T. Sumikama,
H. Suzuki, H. Takeda, D. S. Ahn, H. Baba, P. Doornenbal, N. Fukuda, N. Inabe, T. Isobe, T. Kubo, S. Kubono, H. Sakurai, Y. Shimizu,
S. Chen, B. Blank, P. Ascher, M. Gerbaux, T. Goigoux, J. Giovinazzo, S. Grévy, T. Kurtukián Nieto, C. Magron, W. Gelletly,
Zs. Dombrádi, Y. Fujita, M. Tanaka, P. Aguilera, F. Molina, J. Eberth, F. Diell, D. Lubos, C. Borcea, E. Ganioglu, D. Nishimura,
H. Oikawa, Y. Takei, S. Yagi, W. Korten, G. de France, P. Davies, J. Liu, J. Lee, T. Lokotko, I. Kojouharov, N. Kurz, and H. Shaﬀner,“Studying the exotic decay 70 Kr → 70 Br,” Acta Physica Polonica B 51, 587 (2020).

[Proceedings]

K. Kusaka, “Long term operation of the superconducting triplet quadrupoles with cryocoolers,” J. Phys. Conf. Ser. 1559, 012071 (2020).

Presentations[International Conferences/Workshops]
N. Fukuda, “Present status of the BigRIPS separator and recent development of RI-beam production,” RIBF Users Meeting 2020, Virtual
Conference (Zoom), September 09, 2020.
H. Takeda, “RI beam production in RIBF from the perspective of nuclear reaction,” JSPS/NRF/NSFC A3 Foresight Program “Nuclear
physics in the 21st century” Joint Annual Meeting, Online Conference, November 18, 2020.
N. Fukuda (invited), “Particle identification at BigRIPS separator,” Workshop on Techniques and Detectors for Heavy-ion Charge-State
Identification in High-acceptance Spectrometers, Virtual Conference (Zoom), December 16–17, 2020.

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