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RIKEN Accel. Prog. Rep. 54 (2021)

C O N T E N T S
PagePREFACEGRAVUREFEATURE ARTICLEFirst Beam from SRILAC ··················································································································S1

Ⅰ. HIGHLIGHTS OF THE YEAR
Oblate shapes and metastable states of 92, 94Se ···························································································
P. -A. Söderström et al.

S13

Properties of 187Ta revealed through isomeric decay ···················································································P. M. Walker, Y. Hirayama, et al.

S14In-gas-cell laser resonance ionization spectroscopy of 196, 197, 198Ir ····································································
M. Mukai et al.

S15

Fragmentation of single-particle strength around the doubly-magic nucleus 132Sn and the position of the 0f5/2 proton-holestate in 131In ····························································································································
V. Vaquero et al.

S16

Experimental studies of the two-step scheme with an intense radioactive 132Sn beam for next-generation production ofvery neutron-rich nuclei ·············································································································
H. Suzuki et al.

S17

On-line commissioning of the new SLOWRI/ZD-MRTOF system ··································································
M. Rosenbusch et al.

S18

Mapping of a new deformation region around 62Ti ·····················································································
S. Michimasa et al.

S19

Surface localization of the dineutron in 11Li ·····························································································
Y. Kubota et al.

S20

Probing alpha clusters in the low-density region of the nuclear surface ·····························································J. Tanaka, Z. H. Yang, et al.

S21

Reaction cross sections on a deuteron as a probe of nuclear radii ····································································
W. Horiuchi et al.

S22

Mean-square radius of the neutron distribution and skin thickness derived from electron scattering ···························
H. Kurasawa et al.

S23

Isotopic production of high-radiotoxic nuclide 90Sr via proton- and deuteron-induced reactions ································
R. Matsumura et al.

S24

CP-odd gluonic operators in QCD spin physics ························································································
Y. Hatta

S25

Start the operation of AVF-BIS and its performance evaluation as a successor system to BIS···································
M. Komiyama et al.

S26

HiCARI: High-resolution Cluster Array at RIBF ·······················································································
K. Wimmer et al.

S27

Removing non-isobaric ions from an MRTOF-MS by periodic electric pulses ····················································S. X. Yan, M. Rosenbusch, et al.

S28

Development of the gaseous Xe scintillation detector for heavy RI beams ·························································
Y. Hijikata et al.

S29

μSR study of slightly pressurized organic superconductor κ-(ET)4Hg2.89Br8 ························································
D. P. Sari et al.

S30

Targeted alpha therapy of cancer: Evaluation of [211At] AAMT targeting LAT1 ···················································
K. Kaneda-Nakashima et al.

S31

Influence of antibody stabilization with sodium ascorbate on radioimmunotherapy with an 211At-conjugatedanti-tissue factor antibody ···········································································································
H. Takashima et al.

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Kinetics of Rad51 foci in G2 phase after heavy-ion irradiation in mammalian cells···············································
M. Izumi and T. Abe

S33

Improvement of rotifer as the new food item in larviculture···········································································
K. Tsuneizumi et al.

S34

Ⅱ. RESEARCH ACTIVITIES I (Nuclear, Particle and Astro-Physics)
1. Nuclear Physics
RI beam production at BigRIPS in 2020··································································································
H. Takeda et al.
Production cross-section measurement and new-isotope search for very-neutron-rich RIs produced from 70Zn beamat 345 MeV/nucleaon by BigRIPS separator······················································································
H. Suzuki et al.

1

2

N = 32 shell closure below calcium: Low-lying structure of 50Ar·····································································
M. L. Cortés et al.

3

Proton removal and lifetimes in the Ca isotopes: Spectroscopy and reaction studies··············································
H. L. Crawford et al.

4

Evolution of collectivity in Ti isotopes towards the N = 40 island of inversion·····················································
T. Koiwai, K. Wimmer, et al.

5

RIBF190: Exploring collectivity beyond 78Ni····························································································
F. Browne, V. Werner, et al.

6

Neutron intruder states and collectivity beyond N = 50 towards 78Ni·································································
F. Flavigny et al.

7

High-resolution spectroscopy and lifetime measurements in neutron-rich Zr and Mo isotopes···································
W. Korten et al.

8Single particle structure of semi-magic 129Ag82··························································································
T. Parry et al.

9Characterization of a strongly Coulomb-excited state at an excitation energy above 4 MeV in 136Te····························
A. Jungclaus et al.

10

Study of the 9C proton breakup reaction··································································································
A. I. Chilug et al.

11

Gamow-Teller giant resonance in 11Li neutron drip-line nucleus······································································
L. Stuhl et al.

12

One proton removal cross section of 25F with a carbon target··········································································
Y. Yoshitome et al.

13

Particle identification of SAMURAI11 experiment·····················································································
J. Gao et al.

14

Symmetry energy investigation with pion production from Sn + Sn systems························································
G. Jhang et al.

15

Proton efficiency function for high-multiplicity events in the SπRIT-TPC investigated by the embedding technique········
M. Kaneko et al.

16

Observation of anisotropic collective flow of charged particles and neutrons in heavy-ion collisions at beam energies
of 400 MeV/nucleon··················································································································
S. Yamamura et al.

17

Measurement of proton elastic scattering from 132Sn at 300 MeV/nucleon in inverse kinematics································
T. Harada et al.

18

Results on the β decay of 60Ge and 62Ge measured at RIBF············································································
S. E. A. Orrigo et al.

19

On the β-decay of 70Kr·······················································································································
A. Vitéz-Sveiczer et al.

20

Measuring β-decay strength distribution in the 78Ni region using VANDLE························································
M. Singh et al.

21

Constraining multi-neutron emission models with spectroscopy of neutron-rich Ga isotopes using BRIKEN array··········
R. Yokoyama et al.

22

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Spectroscopy of 99Cd and 101In from β decays of 99In and 101Sn········································································
J. Park et al.

23

Total absorption γ-spectroscopy study of the beta decay of 100Sn·····································································J. A. Victoria et al.

24

Shape evolution of 106, 108, 110Mo in the triaxial degree of freedom·····································································
J. Ha et al.

25

Evolution of proton single-particle states in neutron-rich Sb isotopes beyond N = 82·············································
A. Jungclaus et al.

26

BRIKEN measurements of Pn-values and half-lives for understanding the formation of the r-process rare-earth peak:
progress on the Ce to Nd region·····································································································
A. Tarifeño-Saldivia et al.

27

Precision measurement of ground-state electric quardrupole moment for neutron-rich 21O·······································
A. Gladkov et al.

28

Investigations of magnetic moments in Coulomb fission···············································································
G. Häfner et al.

29

Re-measurement of the 4He(8He, 8Be) reaction··························································································
S. Masuoka et al.

30

Alpha-decay correlated mass measurement of 206, 207Ra using an MRTOF-MS system equipped with an α-TOF
detector ·································································································································
T. Niwase et al.

31

First high-precision direct determination of the atomic mass of a superheavy nuclide·············································
P. Schury, T. Niwase, et al.

32

β-decay spectroscopy of 187Ta··············································································································
M. Mukai et al.

33

β-γ Spectroscopy of 192Re···················································································································
H. Watanabe et al.

34

Insight into the reaction dynamics of proton drip-line nuclear system 17F + 58Ni at near-barrier energies·······················
L. Yang et al.

35

2. Nuclear Physics (Theory)
Dineutron and effective pairing forces in momentum space···········································································
M. Yamagami

37

Structure of 12C studied by the no-core Monte-Carlo shell model·····································································
T. Abe et al.

38

Double charge-exchange phonon states···································································································
X. Roca-Maza et al.

39

Exotic nuclear shape due to cluster formation at high angular momentum··························································
B. Dey et al.

40

Probing dilute nuclear density by antiproton-nucleus scattering······································································
K. Makiguchi et al.

41

Nuclear charge radii with a trained feed-forward neural network·····································································
Di Wu, C. L. Bai, et al.

42

Effects of finite nucleon size, vacuum polarization, and electromagnetic spin-orbit interaction on nuclear binding
energies and radii in spherical nuclei·······························································································
T. Naito, X. Roca-Maza, et al.

43

Trajectory in 2D plot of IS and IV densities of 48Ca and 208Pb·········································································
S. Yoshida, H. Sagawa, et al.

44

Energy-weighted sum rule for Gamow-Teller giant resonances in high-spin isomeric states of N = Z nuclei··················
M. Sasano et al.

45

A fully microscopic model of total level density in spherical nuclei··································································
N. Quang Hung et al.

46

Isobaric analog state energy in deformed nuclei: A toy model ········································································
X. Roca-Maza et al.

47

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Parity-conserved self-consistent CHFB solution························································································
K. Sugawara-Tanabe and K. Tanabe

48

Role of exact treatment of thermal pairing in radiative strength functions of 161, 163Dy nuclei·····································
L. Tan Phuc et al.

49

Non-relativistic expansion of Dirac equation by the reconstituted Foldy-Wouthuysen transformation··························Y. X. Guo and H. Z. Liang

50

On the role of three-particle interactions in nuclear matter·············································································
W. Bentz and I. C. Cloët

51

A3-Foresight theory collaboration for nuclear data library: A3LIB···································································
K. Yoshida52

3. Nuclear Data
EXFOR compilation of RIBF data in 2020·······························································································
T. Tada et al.

53

4. Hadron Physics
Transverse momentum dependence of forward neutron single spin asymmetries in polarized p↑ + p collisionsat √ s = 200 GeV······················································································································
B. Mulilo et al.

55

Transverse single-spin asymmetry for very forward neutral pion production in polarized p + p collisionsat √ s = 510 GeV······················································································································M. H. Kim et al.

56

Transverse single spin asymmetry in charged pion production at midrapidity in polarized p + p collisions at 200 GeV······J. H. Yoo et al.

57

Improvement of the DCA resolution for PHENIX······················································································
G. Nukazuka et al.

58

Recent progress of polarized Drell–Yan experiment at Fermilab,SpinQuest (E1039)··············································
K. Nagai et al.

59

Measurement of J/ψ productions in p + d and p + p at SeaQuest······································································
K. Nakano et al.

60

Expression of interest for EIC-Japan······································································································
Y. Goto et al.

61

Semi-inclusive deep inelastic scattering at the Electron Ion Collider·································································
R. Seidl

62

Bus-extender development for sPHENIX INTT detector···············································································
T. Hachiya et al.

63

5. Hadron Physics (Theory)
Non-global logarithms in hadron collisions at Nc = 3···················································································
Y. Hatta and T. Ueda

65

Veriﬁcation of the QED tenth-order electron g − 2:Diagrams without a fermion loop··············································
A. Hirayama and M. Nio

66

6. Particle Physics
Time development of conformal ﬁeld theories associated with L1 and L−1 operators···············································
T. Tada67

Study of Lorentzian sine-square deformed CFT·························································································
X. Liu and T. Tada

68

Empirical formulas for the standard-model parameters·················································································
Y. Akiba

69

Quarternion-spin-isospin model for the standard-model parameters··································································
Y. Akiba

70

R = 12H02 and its implications to gravity and cosmology··············································································
Y. Akiba

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7. Astrophysics and Astro-Glaciology
A novel high-resolution laser-melting sampler for discrete analyses of ion concentrations and stablewater isotopic compositions in firn and ice cores·················································································
Y. Motizuki et al.
Annually resolved d-excess record from a shallow ice core (DFS10) near Dome Fuji station, East Antarctica················
Y. V. Sahoo et al.

73
74

8. Accelerator
High-intensity vanadium-beam production to search for a new super-heavy element with Z = 119·····························
T. Nagatomo et al.

75

R&D in AVF cyclotron······················································································································
J. Ohnishi et al.

76

Charge stripper ring for RIKEN RI beam factory·······················································································
H. Imao77

2020 operational report for the Nishina RIBF water-cooling system·································································
T. Maie, E. Ikezawa, et al.

78

Status of vacuum pumping systems in accelerator facilities···········································································
Y. Watanabe et al.

79

9. Instrumentation
Development of 216Th and 220Th beams at the BigRIPS separator·····································································
N. Fukuda et al.
BYACO ecosystem for innovative online operation of BigRIPS experiments with seamless connection tocomprehensive analysis···············································································································
T. Sumikama et al.

81

82

Development of auto-focusing and auto-centering system for the BigRIPS separator·············································
Y. Shimizu et al.

83

Thermo-mechanical simulation of high-power rotating target for BigRIPS separator·············································
K. Yoshida and Y. Yanagisawa

84

Incidents involving the DMT3 magnet in the beam transport line from SRC to BigRIPS·········································
K. Kusaka et al.

85

Trace-back method for dispersion matching conditions of primary beams at RIBF················································
A. Sakaue et al.

86

Conceptual design of a heavy ion storage ring RUNBA················································································
M. Wakasugi et al.

87

Development of Resonant-Extraction Charge Breeder (RECB)·······································································R. Ogawara et al.

88

Development of a forward detector for the measurement of the mean square radius of the neutron distributionof unstable nuclei by electron scattering···························································································
H. Wauke et al.

89

Ion-beam-profile monitor using MCP at the SCRIT electron scattering facility····················································
T. Ohnishi et al.

90

Extraction test of stopped Bi isotopes in PALIS gas cell···············································································
T. Sonoda et al.

91

Improvement of evacuation time of RI from argon gas cell············································································
T. Sonoda et al.

92

Fourth report on offline tests for RF carpet transportation in RF ion guide gas cell at the SLOWRI facility···················
A. Takamine et al.

93

High mass resolving power and isomeric state separation at SLOWRI/ZD-MRTOF system·····································
W. Xian, M. Rosenbusch, et al.

94

Offline ion source for laser spectroscopy of RI at SLOWRI···········································································
M. Tajima et al.

95

Temperature and pressure dependence of ion extraction from RF gas cell···························································
D. Hou, A. Takamine, et al.

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Degrader optimization for ZeroDegree gas cell··························································································
S. Chen et al.

97

Online extraction efficiency from RF ion guide gas cell at SLOWRI·································································
S. Iimura et al.

98

Development of MCP timing detector for low-energy heavy ions····································································
T. T. Yeung et al.

99

Improvement of kicker system for rare-RI ring··························································································
Y. Yamaguchi et al.

100

Improved position resolution of the beam diagnostics detector for the Rare-RI Ring··············································
G. Hudson-Chang, S. Naimi, et al.

101

Computer server and network for HiCARI experiments················································································
H. Baba et al.

102

Development of a high-bandwidth waveform processing system using RFSoC····················································S. Takeshige et al.

103

GPU acceleration of SAMURAI particle tracking simulation·········································································
J. Gao104

Observation of Rb D1 fluorescence in superfluid helium using picosecond time-resolved detection····························Y. Takeuchi et al.

105

Development of ion trap system for the neutralizer toward production of spin-polarized RI beam using atomic
beam magnetic resonance method···································································································
K. Imamura et al.

106

Status of the J-PARC E16 experiment in 2020···························································································
S. Yokkaichi et al.

107

Construction of GEM Tracker for J-PARC E16 experiment Run0-a··································································T. N. Murakami et al.

108

Performance evaluation of the electron identification system for the J-PARC E16 experiment···································S. Nakasuga et al.

109

Intermediate silicon tracker for sPHENIX experiment at RHIC·······································································
I. Nakagawa et al.

110

Detection efficiency of the INTT test bench for sPHENIX·············································································
G. Nukazuka et al.

111

Radiation resistance of bus extender cable for sPHENIX-INTT······································································
H. Imai et al.

112

Electrical and mechanical properties of the bus-extender··············································································
M. Morita, Y. Akiba, et al.

113

Upgrade of the Si-CsI array TiNA for transfer reactions at OEDO···································································
B. Mauss, J. W. Hwang, et al.

114

Heat durability test of molybdenum foil for the new CRIB cryogenic gas target···················································
S. Hayakawa et al.

115

Radiation resistivity test of an optical fiber for laser cooling of francium atoms····················································
T. Hayamizu et al.

116

Development of novel detection system for francium ions extracted from online surface ionizer································
N. Ozawa et al.

117

Experiment on hydrogen removal apparatus for helium supply and recovery system··············································
M. Nakamura et al.

118

Safety interlock system for LINAC building·····························································································
A. Akashio et al.

119Computing and network environment at the RIKEN Nishina Center·································································
T. Ichihara et al.

120

CCJ operations in 2020······················································································································
S. Yokkaichi et al.

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Ⅲ. RESEARCH ACTIVITIES II (Material Science and Biology)
1. Atomic and Solid State Physics (Ion)
Control of electrical conductivity in diamond by boron-implantation using an ECR ion source—application ofhigh-temperature and high-pressure annealing····················································································
H. Yamazaki et al.

123

Single-event effects in SiC planar and trench power MOSFETs······································································
M. Iwata et al.

124

Profile measurements of dual-microbeams generated by glass capillaries···························································
M. Mori et al.

125

2. Atomic and Solid State Physics (Muon)
Partial order of conduction electrons in Mn3CoSi·······················································································
S. Shamoto, D. P. Sari, et al.

127

Magnetism and superconductivity in underdoped region of T*-type La1−x/2Eu1−x/2SrxCuO4−yFy····································
M. Takahama et al.

128

Spin dynamics in Pyrochlore Nd2Mo2O7··································································································
L. J. Chang et al.

129

Possible multipolar ordering in spin-orbital-entangled d 2 system on a face-centered-cubic lattice·······························
T. Takayama et al.

130

Successive Transitions in Spin-dimer Compound Cs3V2Cl9············································································
H. Kikuchi et al.

131

Magnetism of novel heavy fermion compound YbCu4Ni investigated by μSR······················································
T. Taniguchi et al.

132

ZF-μSR measurement to investigate thermal hysteresis of MgTi2O4 at low temperature··········································
U. Widyaiswari et al.

133

Observation of Cu spin fluctuations in over-doped regime La2-xSrxCuO4 nanoparticles············································
S. Winarsih et al.

134

The electron transfer channel in the sugar recognition system assembled on gold nano particles································
T. Goto et al.

135

Antiferromagnetic ordering of λ-(BEST)2FeCl4 observed by µSR measurement···················································
T. Kobayashi et al.

136

Zero-ﬁeld µSR on the out-of-plane superconductivity of λ-(BETS)2GaCl4··························································
D. P. Sari et al.

137

Li-ion di usion in LiFeSixP1−xO4/C with x =0 and 0.03··················································································
F. Astuti et al.

138

Measurement of muon spin rotation in muonic hydrogen atom·······································································
S. Kanda and K. Ishida

139

A LYSO calorimeter prototype for muonic X-ray detection···········································································
S. Kanda and K. Ishida140

3. Radiochemistry and Nuclear Chemistry
Production of 266Bh in the 248Cm(23Na, 5n)266Bh reaction and its decay properties··················································
H. Haba et al.
Measurement of the isotopic ratio of Np-236 to Np-237 in Th-232 + Li-7 reaction products by accelerator mass
spectrometry··································································································································
A. Nakajima et al.
Production and photon measurement of 229Pa toward the observation of radiative decay of 229mTh······························
Y. Shigekawa et al.
Measurement of extraction time and e ciency of 220Rn ions using a cryogenic RF-carpet gas cell for the chemistryof superheavy elements···············································································································
Y. Shigekawa et al.
Anion-exchange behavior of Db in HF/HNO3 solution·················································································
M. Kato et al.

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143

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Anion exchange of Rf in H2SO4 using the batch-type solid-liquid extraction apparatus AMBER································
T. Yokokita et al.

148

Online anion-exchange experiment of Zr in H2SO4 for the chemical study of Rf in H2SO4·······································
T. Yokokita et al.

149

Solvent extraction of Zr and Hf from HCl by Aliquat 336 using a ﬂow-type extraction apparatus toward online
chemical studies of element 104, rutherfordium··················································································
Y. Kasamatsu et al.

150

Cation- and anion-exchange behavior and UV-vis spectroscopy of Zr in HBr for chemical characterization ofbromide complexes of Rf·············································································································
T. Yokokita and H. Haba

151

Solvent extraction of Fr and Cs with calix[4]arene-bis(benzocrown-6)······························································
Y. Komori and H. Haba

152

Solvent extraction and speciation of astatine species via thin layer chromatography··············································
S. Maruyama et al.

153

Ru and 57Fe Mössbauer spectroscopic studies of Na2Ru1−xFexO3 of sodium-ion battery electrode (2)·························
K. Hamano et al.

154

Targeted alpha therapy for thyroid cancer: Radiation-induced toxicity of [211At]NaAt in mice···································
Y. Liu et al.

155

Quality conﬁrmation of RIKEN 186Re using bifunctional chelating agents and derivatives·······································S. Oshikiri et al.

156

Complex formation of Rhenium-186 with lipophilic ligands —Comparison with technetium-99m—··························I. O. Umeda et al.

157

Simultaneous imaging of Na+/K+ by semiconductor Compton camera GREI·······················································S. Motomura et al.

159

Development of image reconstruction method for a multiple-isotope PET using 44mSc············································
T. Fukuchi et al.

160

Double photon emission nuclides for double photon coincidence imaging··························································
H. Takahashi et al.

161

Production cross sections of 225Ac in the 232Th(14N, xnyp) reactions at 116 and 132 MeV/nucleon·······························
X. Yin et al.

162

Cross sections of alpha-particle-induced reactions on natNi: Production of 67Cu····················································S. Takács et al.

164

Production cross sections of 68Ga and radioactive by-products in deuteron-induced reactions on natural zinc·················
Ts. Zolbadral et al.

165

Activation cross section measurement of the deuteron-induced reaction on yttrium-89 for zirconium-89 production········
M. Sakaguchi et al.

166

Excitation functions of deuteron-induced reactions on 141Pr for medical radioisotope production·······························
M. Aikawa et al.

167

Production cross sections of medical radioisotope 153Sm in alpha-particle-induced reaction on natural neodymium··········
M. Sakaguchi et al.

168

Production cross sections of 155Tb in deuteron-induced reactions on natural gadolinium··········································
D. Ichinkhorloo et al.

169

Production cross sections of natEr(d, x)171Er reactions on natural erbium·····························································
M. U. Khandaker and H. Haba

170

Measurement of production cross sections of 175Hf in the natLu(p, x) and natLu(d, x) reactions····································
Y. Komori et al.

171

99

4. Radiation Chemistry and Biology
Selection of high-yield rice mutant induced by heavy-ion beam irradiation ························································
Y. Hayashi et al.
Whole genome sequencing analysis for detecting mutations induced by carbon- and argon-ion irradiations ofrice (Oryza sativa L.)·················································································································
R. Morita et al.

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RIKEN Accel. Prog. Rep. 54 (2021)

Detection of structural variations in three responsible genes induced by relatively high-LET ion beams in rice··············
Y. Shirakawa et al.

175

Dose-dependent mutagenic effects of 160-MeV/nucleon-argon beam in Arabidopsis thaliana··································
K. Ishii et al.

176

Argon-ion-induced mutant of Arabidopsis thaliana exhibiting accelerated leaf chlorosis·········································
A. Sanjaya et al.

178

Effect of heavy-ion irradiation on survival rate of Torenia fournieri··································································
A. Matsuta et al.

179

Behaviors of the Saprophytic Tricholoma matsutake Mutants G1 and Ar 59 In Vitro Substrate Cultivation: the former
exhibited Morphological Changes while the latter did not·······································································
H. Murata et al.

180

Ⅳ. OPERATION RECORDS
Program Advisory Committee meetings for nuclear physics and for materials and life sciences·································
H. Ueno et al.

181

Electric power status of RIKEN Nishina Center in 2020···············································································
E. Ikezawa et al.

182

RILAC operation·····························································································································
K. Oyamada, E. Ikewaza, et al.

183

Operation report on the ring cyclotrons in the RIBF accelerator complex···························································
S. Ishikawa et al.

184

Operation report on the RIKEN AVF cyclotron for 2020···············································································
M. Nishida et al.

185

Present status of liquid-helium supply and recovery system···········································································
T. Dantsuka et al.

186

Operation of the BigRIPS cryogenic plant·······························································································
K. Kusaka et al.

187

Radiation safety management at RIBF····································································································
K. Tanaka et al.

188

Operation of the Pelletron tandem accelerator···························································································
T. Ikeda et al.

190

Fee-based activities of the Industrial Application Research Team····································································
A. Yoshida et al.

191

Activity report of the second-term (2014–2021) RIBF Theory Forum·······························································
T. Abe et al.

192

Ⅴ. EVENTS
Symposium on Nuclear Data 2020········································································································
H. Otsu et al.

195

The 8th Asia-Pacific Conference on Few-Body Problems in Physics (APFB2020)················································
E. Hiyama et al.

196

Domestic Workshop on Spin Physics······································································································
Y. Goto et al.

197

Ⅵ. ORGANIZATION AND ACTIVITIES OF RIKEN NISHINA CENTER(Activities, Members, Publications & Presentations)
Organization
1. Organization Chart ·················································································································

199

2. Finances······························································································································

200

3. Staffing·······························································································································

200

4. Research publication···············································································································

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5. Management·························································································································

202

6. International Collaboration········································································································

206

7. Awards·······························································································································

207

8. Brief overview of the RI Beam Factory·························································································

209

Center Director·······························································································································

211

Laboratories
Nuclear Science and Transmutation Research Division
Radioactive Isotope Physics Laboratory···························································································

213

Spin isospin Laboratory··············································································································

220

Nuclear Spectroscopy Laborarory···································································································

227

High Energy Astrophysics Laborarory·····························································································

232

Superheavy Element Research Group······························································································

238

Superheavy Element Production Team·······················································································

240

Superheavy Element Device Development Team··········································································

243

Astro-Glaciology Research Group··································································································

245

Nuclear Transmutation Data Research Group·····················································································

247

Fast RI Data Team··············································································································

248

Slow RI Data Team·············································································································

250

Muon Data Team················································································································

252

High-Intensity Accelerator R&D Group····························································································

254

High-Gradient Cavity R&D Team····························································································

255

High-Power Target R&D Team·······························································································

256

Research Facility Development Division
Accelerator Group·····················································································································

257

Accelerator R&D Team········································································································

259

Ion Source Team················································································································

260

RILAC Team····················································································································

261

Cyclotron Team·················································································································

262

Beam Dynamics & Diagnostics Team·······················································································

263

Cryogenic Technology Team··································································································

265

Infrastructure Management Team·····························································································

266

Instrumentation Development Group·······························································································

268

SLOWRI Team··················································································································

270

Rare RI-ring Team··············································································································

273

SCRIT Team·····················································································································

275

Research Instruments Group·········································································································

277

BigRIPS Team···················································································································

278

SAMURAI Team················································································································

281

Computing and Network Team································································································

283

Detector Team···················································································································

285

Accelerator Applications Research Division
Beam Mutagenesis Group············································································································

287

Ion Beam Breeding Team······································································································

288

Plant Genome Evolution Research Team····················································································

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CONTENTS

RIKEN Accel. Prog. Rep. 54 (2021)

RI Application Research Group·····································································································

293

Nuclear Chemistry Research Team···························································································

294

Industrial Application Research Team·······················································································

300

Subnuclear System Research Division
Quantum Hadron Physics Laboratory······························································································

301

Strangeness Nuclear Physics Laboratory···························································································

306

Radiation Laboratory··················································································································

309

Meson Science Laboratory···········································································································314

RIKEN BNL Research Center·······································································································

319

Theory Group····················································································································

320

Experimental Group············································································································

324

Computing Group···············································································································329

RIKEN Facility Offce at RAL·······································································································

334

Safety Management Group···········································································································

338

User Liaison Group···················································································································

340

RIBF User Liaison Team·······································································································

341

Outreach Team··················································································································

342

Office of the Center Director·········································································································

343

Partner Institutions···························································································································

347

Center for Nuclear Study, Graduate School of Science, The University of Tokyo···········································

348

Wako Nuclear Science Center, IPNS (Institute of Particle and Nuclear Studies),
KEK (High Energy Accelerator Research Organization)··································································

358

Ⅶ. APPENDICES
Symposia & Workshops·····················································································································

361

Seminars·······································································································································

362

Events··········································································································································

367

Press Releases ································································································································

368

Preprints ······································································································································

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