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RIKEN Accelerator Progress Report

RIKEN Accelerator Progress Report 2017 Vol. 51


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PREFACE

Ⅰ. HIGHLIGHTS OF THE YEAR
Persistence of the Z = 28 shell gap around ⁷⁸Ni: first spectroscopy of ⁷⁹Cu L. Olivier et al.	1
Decay properties of neutron-rich nuclei around mass A = 100 S. Nishimura et al.	2
Discovery of new isotopes ^{81, 82}Mo and ^{85, 86}Ru and a determination of the particle instability of ¹⁰³Sb H. Suzuki et al.	3
Discovery of ⁷²Rb: A nuclear sandbank beyond the proton drip line H. Suzuki et al.	4
Determination of fusion barrier distributions from quasielastic scattering cross sections towards superheavy nuclei synthesis T. Tanaka et al.	5
Direct mass measurement of neutron-rich calcium isotopes, ^55-57Ca S. Michimasa et al.	6
Observation of new neutron-rich isotopes among flssion fragments from in-flight flssion of 345 MeV/nucleon ²³⁸U: search for new isotopes conducted concurrently with decay measurement campaigns Y. Shimizu et al.	7
Identication of New Neutron-rich Isotopes in the Rare-Earth Region Produced by 345 MeV/nucleon ²³⁸U N. Fukuda et al.	8
Direct mass measurement of a T_1/2 = 10 ms nucleus with a relative precision of 10^-7 level M. Wada et al.	9
Supernova equation of state based on realistic nuclear forces H. Togashi et al.	10
Single electron yields of charm and bottom hadron decays in central Au+Au collisions at √s_NN = 200 GeV K. Nagashima et al.	11
Are two nucleons bound in lattice QCD for heavy quark masses? T. Iritani	12
Origin of the fake eigen energy of the two-baryon system in lattice QCD T. Iritani	13
Λc → N form factors from lattice QCD and phenomenology of Λ_c → nℓ⁺ν_ℓ and Λ_c → p μ⁺μ⁻ decays S. Meinel	14
Lattice QCD calculation of neutral D-meson mixing matrix elements E. Neil	15
A prototype novel laser-melting sampler for analyzing ice cores with high depth resolution and high throughput M. Maruyama et al.	16
Production of vanadium-ion beam from RIKEN 28 GHz SC-ECRIS Y. Higurashi et al.	17
Doughnut-shaped gas cell for KEK Isotope Separation System Y. Hirayama et al.	18
Development of an off-axis electron beam source for cold highly charged ion generation in a linear combined ion trap N. Kimura	19
TINA - a silicon tracker for transfer reactions P. Schrock et al.	20
Spot size estimation for laser aiming system of ion microbeam irradiation using a tapered glass capillary optics K. Sato et al.	21
Magnetic moments and ordered states in pyrochlore iridates Nd₂Ir₂O₇ and Sm₂Ir₂O₇ studied by muon-spin relaxation R. Asih and I. Watanabe	22
Effect of Fe substitution on Cu-spin dynamics in the electron-doped cuprates Eu_2-xCe_xCuO_4+α−δ Risdiana	23
One-pot three-component double-click method for synthesis of [₆₇Cu]-labeled biomolecular radiotherapeutics K. Fujiki and K. Tanaka et al.	24
Cross section measurement to produce ⁹⁹Mo through alpha-induced reactions on natural Zr T. Murata et al.	25
Analysis of carbon ion-induced mutations by exome sequencing of an unselected rice population H. Ichida et al.	26
Effect of LET on mutational function revealed by whole-genome resequencing of Arabidopsis mutants Y. Kazama et al.	27
Ⅱ. RESEARCH ACTIVITIES I (Nuclear, Particle and Astro-Physics)
1. Nuclear Physics
Single-neutron knockout from ²⁰C and the structure of¹⁹C J.W. Hwang et al.	29
Observation of isoscalar and isovector dipole excitations in²⁰O N. Nakatsuka and H. Baba	30
Neutron-neutron correlation in Borromean nucleus ¹¹Li via the (p, pn) reaction Y. Kubota et al.	31
Differential cross section of proton elastic scattering from neutron-rich ⁶He at 200 A MeV and high momentum transfers S. Chebotaryov et al.	32
Two methods for invariant mass reconstruction from events with multiple charged particles S. Koyama et al.	33
Electric dipole responses of ⁵⁰Ca and ⁵²Ca Y. Togano et al.	34
Many-neutron systems: search for superheavy ⁷H and its tetraneutron decay F. M. Marqués and Z. Yang	35
Low-energy dipole response of the halo nuclei ^{6, 8}He C. Lehr and T. Aumann et al.	36
Investigation of the tetraneutron by quasi-free α-knockout from ⁸He F. Schindler and T. Aumann et al.	37
Shell evolution at N = 40 towards ⁶⁰Ca: Spectroscopy of ⁶²Ti M. L. Cortés et al.	38
Spectroscopy of Sc isotopes between the N = 34 and N = 40 subshell closures P. Koseoglou et al.	39
Production of very neutron-rich nuclei via two-proton knockout reaction with deuterium operation of MINOS M. Miwa et al.	40
Study on the impact parameter dependence on the trigger efficiency for the SπRIT experiment M. Kaneko et al.	41
Status of collective flow analysis for SπRIT-TPC experiment M. Kurata-Nishimura	42
Gamma decay of unbound neutron-hole states in ¹³³Sn V. Vaquero et al.	43
Shell evolution beyond Z = 28 and N = 50: spectroscopy of ^81-84Zn C.M. Shand and Zs. Podolyak et al.	44
Robustness of the N = 34 shell closure: First spectroscopy of ⁵²Ar H. N. Liu et al.	45
First Spectroscopic study of ⁵⁶Ca S. Chen and F. Browne et al.	46
Triaxiality of neutron-rich ^84,86,88Ge from low-energy spectra M. Lettmann et al.	47
Precise measurement of the ⁴He(⁸He,⁸Be) reaction S. Masuoka et al.	48
Measurement of ^{77, 79}Se(d, p)^{78, 80}Se reactions as a surrogate for ⁷⁹Se(n, γ)⁸⁰Se reaction N. Imai	49
Spallation reaction study of ¹³⁶Xe on proton, deuteron and carbon X. Sun and H. Wang et al.	50
Measurements of new beta-delayed neutron emission properties around doubly magic ⁷⁸Ni K. Rykaczewski et al.	51
Beta-neutron-gamma spectroscopy of beta-delayed neutron emitters around doubly-magic ⁷⁸Ni K. Rykaczewski et al.	52
Measuring the β-decay properties of Na-Al species located at the neutron drip line P. V. Phong et al.	53
Measurement of β-delayed neutron emission probabilities for progenitors of the A = 130 r-process abundance peak J. Liu and V. H. Phong et al.	54
β-delayed neutron emission probabilities for understanding the formation of the r-process rare-earth peak G. G. Kiss et al.	55
Study of the superallowed 0⁺ → 0⁺ β decay of ⁷⁰Br A. I. Morales et al.	56
Results on ⁶⁴As decay measured at BigRIPS B. Rubio	57
γ rays identified in the decay chain of ⁶⁴Se measured with EURICA P. Aguilera and F. Molina et al.	58
Isomer-decay spectroscopy of ⁶⁷Fe and reaction-channel dependency of isomeric ratios from interactions in the MINOS proton target P.-A. Söderström et al.	59
Beta-decay half-lives of ⁷⁸Kr fragments from Cu to Ge T. Goigoux et al.	60
Isomer spectroscopy of ^{92, 94}Se in the SEASTAR 2015 experiment C. Lizarazo et al.	61
γ-decaying isomers and isomeric ratios in the ¹⁰⁰Sn region J. Park et al.	62
Coexisting Single-Particle and Collective Structures in ¹³⁷Sb J. Keatings	63
Investigation of octupole correlations of neutron-rich Z ～ 56 isotopes by β-γ spectroscopy R. Yokoyama et al.	64
First result of elastic electron scattering from ¹³²Xe at the SCRIT facility K. Tsukada et al.	65
Complete set of deuteron analyzing powers from d→p elastic scattering at 190 MeV/nucleon K. Sekiguchi et al.	66
Single-particle states and collective modes: magnetic moment of ⁷⁵mCu Y. Ichikawa et al.	67
Track reconstruction of recoil particles in CAT-S at RIBF113: ¹³²Sn(d,d’) measurement S. Ota et al.	68
Atomic masses of intermediate-mass neutron-deficient nuclei with sub-ppm precision via multireflection time-of-flight mass spectrograph S. Kimura et al.	69
Decay measurement of ²⁸³Cn produced in the ²³⁸U(⁴⁸Ca,3n) reaction using GARIS-II D. Kaji et al.	70
Yield development of KEK isotope separation system Y.X. Watanabe et al.	71
The structure and decay of high-K isomers in ¹⁸⁷Ta P.M. Walker et al.	72
Nuclear spectroscopy of ^196,197,198Ir isotopes M. Mukai et al.	73
Ground-state electromagnetic moments of ²¹O A. Gladkov et al.	74
β-NQR measurement of the ²³Ne ground state H. Nishibata et al.	75
^26mAl proton resonant elastic scattering with CRIB D. Kahl and H. Shimizu et al.	76
Development of a high density ⁷Be beam at CRIB A. Inoue	77
Experimental setup of the ⁶He(p, n) measurement at HIMAC and identification of the charge-exchange (p, n) reaction channel M. Sasano et al.	78
RI beam production at BigRIPS in 2017 D.S. Ahn et al.	79
Observation of new neutron-rich Mn, Fe, Co, Ni, and Cu isotopes in the vicinity of ⁷⁸Ni T. Sumikama et al.	81
New isotope of ³⁹Na and the neutron dripline of neon isotopes using a 345 MeV/nucleon ⁴⁸Ca beam D.S. Ahn et al.	82
Exploration of the ⁶⁰Ca region O.B.Tarasov et al.	83
New isotope search conducted concurrently with BRIKEN campaign Y. Shimizu et al.	84
Production of neutron-rich nuclei in the vicinity of N = 126 by means of projectile fragmentation of 345 MeV/nucleon ²³⁸U N. Fukuda et al.	85
Cross-section measurement of neutron-rich Pd isotopes produced from an RI beam of ¹³²Sn at 280 MeV/nucleon H. Suzuki et al.	86
2. Nuclear Physics (Theory)
Mesic nuclei with a heavy antiquark Y. Yamaguchi and S. Yasui	87
Interplay between isoscalar and isovector correlations in neutron-rich nuclei I. Hamamoto and H. Sagawa	88
New interpretation of pairing anti-halo effect K. Hagino and H. Sagawa	89
Role of deformation in odd-even staggering in reaction cross sections for ^30,31,32Ne and ^36,37,38Mg isotopes Y. Urata, K. Hagino and H.Sagawa	90
Enhancement of pairing fluctuation in neutron-rich Mg isotopes studied by Skyrme QRPA calculation M. Yamagami	91
Testing constant-temperature approach for nuclear level density N. Dinh Dang et al.	92
Giant dipole resonance and shape transitions in hot and rotating ⁸⁸Mo A. K. Rhine Kumar et al.	93
Level density and thermodynamics in hot rotating ⁹⁶Tc nucleus B. Dey et al.	94
Shell-model description of magnetic dipole bands in ¹⁰⁵Sn M. Honma et al.	95
Effect of pairing on the wobbling motion in odd-A nuclei K. Sugawara-Tanabe and K. Tanabe	96
Application of a Coulomb energy density functional for atomic nuclei: Case studies of local density approximation and generalized gradient approximation T. Naito et al.	97
Joint project for large-scale nuclear structure calculations in 2017 N. Shimizu et al.	98
3. Nuclear Data
Proton- and deuteron-induced reactions on ¹⁰⁷Pd and ⁹³Zr at 20–30 MeV/nucleon M. Dozono et al.	99
Measurement of isotopic production cross sections of proton- and deuteron-induced spallation reactions on ⁹³Zr at 200 MeV/nucleon S. Kawase et al.	100
Measurement of double-differential neutron yields for 345 MeV/nucleon ²³⁸U incidence on Cu K. Sugihara et al.	101
Construction of implantation beam line for the verification test of ¹⁰⁷Pd transmutation Y. Miyake et al.	102
A study of additional uncertainties from fit boundaries using a new code for multi-reflection time-of-flight data M. Rosenbusch et al.	103
EXFOR Compilation of RIBF data in 2017 D. Ichinkhorloo et al.	104
Monte-Carlo simulation of transmutation based on experimental nuclear data S. Ebata et al.	105
4. Hadron Physics
Final result of nuclear dependence on A_N for forward neutron production in polarized p+A collisions at √s_NN = 200 GeV M. Kim et al.	107
Coulomb-nuclear interference effects on forward π⁰ production in polarized-proton–nucleus collisions G. Mitsuka	108
Preparatory work toward measurement of the azimuthal anisotropy of heavy quark electrons in Au+Au collisions at √s_NN = 200 GeV Y. Ueda et al.	109
Study of azimuthal anisotropy of charged particles in Au+Au collisions at √s_NN = 200 GeV at RHIC-PHENIX R. Nishitani	110
Single transverse spin asymmetry (A_N) in polarized p + Au collisions at √s_NN = 200 GeV Y. H. Yoo et al.	111
Operation summary of the RHICf experimet J. S. Park	112
RHICf-STAR common operation in √ s = 510 GeV proton-proton collisions M. Ueno et al.	113
Beam polarization monitor in √ s = 510 GeV polarized proton-proton collisions at the RHICf experiment M. H. Kim	114
DAQ performances of the RHICf operation in 2017 H. Menjo et al.	115
Fragmentation function measurements in Belle R. Seidl et al.	116
Status of measurements of Drell–Yan process at FNAL SeaQuest K. Nakano et al.	117
Design of the innermost layer module of the silicon tracking detector for the sPHENIX experiment Y. Yamaguchi et al.	118
5. Hadron Physics (Theory)
Covariant calculation of quark distribution functions in ρ⁺-meson Y. Ninomiya et al.	119
ΣN and ΛN interactions from 2 + 1 flavor lattice QCD with almost physical masses H. Nemura et al.	120
P-wave ππ scattering and the ρ resonance from lattice QCD C. Alexandrou et al.	121
Computing the nucleon charge and axial radii directly at Q² = 0 in lattice QCD N. Hasan et al.	122
6. Particle Physics
Phenomenology of Λ_b → Λ_cτ ¯ν using lattice QCD calculations A. Datta et al.	123
A pilot study of proton decay matrix elements at physical quark mass Y. Aoki et al.	124
Unified scenario for composite right-handed neutrinos and dark matter E. Rinaldi et al.	125
Empirical formulae of the masses of elementary particles Y. Akiba	126
Exact algebraic separability criterion for two-qubit systems K. Fujikawa and C. H. Oh	127
Conformal Quantum Mechanics and Sine-Square Deformation T. Tada	128
7. Astrophysics and Astro-Glaciology
Measurements of nitric acid formation in humidified air by proton irradiation Y. Nakai et al.	129
8. Accelerator
Cooling down test of prototype accelerator system based on SC-QWR K. Ozeki et al.	131
Transfer of GARIS-II and charge-state multiplier (CSM) cavities Y. Watanabe et al.	132
Magnet power supplies for GARIS-II K. Kumagai et al.	133
Residual Gas Effect in LEBT on the Transverse Emittance of Multiply-Charged Heavy Ion Beams Extracted from ECRIS T. Nagatomo et al.	134
An innovative method for ¹²C⁴⁺ suppression in ¹⁸O⁶⁺ beam production in an electron cyclotron resonance ion source H. Muto et al.	135
Renewal of control system and driving mechanism of cavity tuning devices for RILAC Rebuncher K. Yamada et al.	136
Installation of new central region for energy upgrade at RIKEN AVF cyclotron J. Ohnishi et al.	137
Improvement of injection beam-orbit analysis of AVF cyclotron Y. Kotaka et al.	138
Radiation monitoring for cycrotrons in RIBF M. Nakamura et al.	139
Update plan of the existing beam interlock system for the RIBF M. Komiyama et al.	140
Upgrade of server systems for RIBF control A. Uchiyama et al.	141
Maintenance of vacuum equipment of accelerators S. Watanabe et al.	142
Operation report 2017 for Nishina and RIBF water-cooling systems T. Maie et al.	143
Measurement of electron density and temperature in plasma window with diameter of 10 mm N. Ikoma et al.	144
9. Instrumentation
Pulse-shape data taking with double-sided strip silicon detector D. Suzuki et al.	145
Stress Test of digital DAQ system for PANDORA J. GAO et al.	146
Development of a high resolution neutron detector HIME A. T. Saito	147
Development and test of the dual-gain ASIC preamplifier boards for the GLAST silicon-strip detectors V. Panin et al.	148
A silicon vertex tracker for the ⁸He(p, pα)4n reaction F. Dufter et al.	149
First implementation of the new segmented implantation detector for decay studies with BRIKEN array R. Grzywacz	150
Preparation of the VANDLE array for beta decay studies at RIBF S. Go et al.	151
Timing performance of a mirror-type MCP detector use for mass measurements at the Rare RI Ring Z. Ge et al.	152
Delay-line Anode for MCP-based Position Sensitive Detector at Rare RI Ring H. F. Li et al.	153
Improvement of detection efficiency of time-of-flight detector with large effective area S. Ishizawa et al.	154
Performance test of low-pressure MWDC for missing mass spectroscopy at BigRIPS T. Nishi et al.	155
Development of the gaseous Xe scintillation detector J. Zenihiro et al.	156
Development of α-ToF detector for correlation measurement of atomic masses and decay properties of superheavy nuclides T. Niwase et al.	157
DALI2+ at the RIKEN Nishina Center RIBF I. Murray et al.	158
Improvement of the maintenance environment for Ge detectors H. Sato et al.	159
Overview of silicon strip sensor detector development for sPHENIX experiment I. Nakagawa et al.	160
Development of long multi-layered flexible cable of silicon sensor detector for sPHENIX experiment M. Tsuruta	161
Research and development of very long and dense data bus for sPHENIX INTT detector T. Hachiya et al.	162
Commissioning of the OEDO beamline S. Michimasa et al.	163
Optimization of sextupole magnets in the BigRIPS fragment separator for a high-purity RI beam T. Sumikama et al.	164
Improvement of transmission efficiency for the rare-RI ring Y. Yamaguchi et al.	165
Investigation of transmission efficiency loss at Rare-RI Ring S. Naimi and Y. Yamaguchi et al.	166
Isochronous condition in Rare RI Ring Y. Abe et al.	167
Present status of data analysis of commissioning experiment using exotic nuclei D. Nagae et al.	168
The progress of on-line commissioning study on parasitic production of low-energy RI-beam system (PALIS) at BigRIPS T. Sonoda	169
Improved wide bandwidth mass analysis with MRTOF-MS P. Schury and M. Wada et al.	170
Surface temperature measurements of the high power beam dump of the BigRIPS separator K. Yoshida et al.	171
Thermo-mechanical calculations of the high power beam dump of the BigRIPS separator Z. Korkulu et al.	172
Present status of the beam transport line from SRC to BigRIPS K. Kusaka et al.	173
Present status of ERIS at the SCRIT electron scattering facility T. Ohnishi et al.	174
Progress in the dc-to-pulse converter FRAC M. Wakasugi et al.	175
Improvements on the racetrack microtron at SCRIT A. Enokizono et al.	176
Electron energy stabilization at the electron gun in RTM M. Watanabe et al.	177
High pressure cold gas target system with large capacity for low-energy beam at RIBF R. Nakajima and S. Koyama	178
Resonance ionization spectroscopy of Nb utilizing a narrowband injection-locked Titanium:Sapphire laser M. Reponen et al.	179
Development of co-located ¹²⁹Xe and ¹³¹Xe nuclear spin masers with external feedback scheme T. Sato et al.	180
Searching optimum measurement conditions of the laser-microwave double resonance for the atoms stopped in superfluid helium M. Sanjo et al.	181
Optimizing the conditions to measure the hyperfine splitting in the μp ground state A. Vacchi, K. Ishida and E. Mocc	182
Neutron spin filter with dynamic nuclear polarization using photo-excited triplet electron for T-violation search in a compound nucleus S. Takada et al.	183
Trigger selector system for BigRIPS DAQ H. Baba et al.	184
Beam preparation for industrial utilization of Ar, Kr, Xe, and Au beams A. Yoshida and T. Kambara	185
Evaluation of radioactivity in semiconductor samples by Kr-ion beam irradiation T. Kambara and A. Yoshida	186
Computing and network environment at the RIKEN Nishina Center T. Ichihara et al.	187
CCJ operations in 2017 S. Yokkaichi et al.	188
Ⅲ. RESEARCH ACTIVITIES II (Material Science and Biology)
1. Atomic and Solid State Physics (Ion)
Anomalous peak effect in 122-type iron-based superconductors T. Tamegai et al.	189
Evolution of Kr precipitates in Kr-implanted Al as observed by the channelling method E. Yagi and S. Takagi	190
Magnetism of the antiferromagnetic spin-3/2 dimer compound CrVMoO₇ having an antiferromagnetically ordered state M. Hase et al.	191
Investigation of single-event effect observed in GaN-HEMT Y. Nakada et al.	192
Profile measurements of laser beam for the aiming system of ion microbeam irradiation with glass capillaries K. Hirose et al.	193
2. Atomic and Solid State Physics (Muon)
First measurement of magnetic correlations in T^★-214 cuprate K. M. Suzuki et al.	195
Nano-size effect on Néel temperature and magnetic ordering of La₂CuO₄ S. Winarsih et al.	196
Effect of Supercell Calculation on Muon Sites in La₂CuO₄ M. R. Ramadhan et al.	197
Modulated Kubo-Toyabe functions to study fluctuated weak magnetism and muon diffusion at pseudogap state of underdoped La_2−xSr_xCuO₄ M. D. Umar	198
Study of Implanted Muons in YBa₂Cu₃O₆ I. Ramli et al.	199
μSR study of FeSe_1−xS_x around nematic critical point Y. Tanabe et al.	200
Caged-type superconductor Sc₅Ru₆Sn₁₈ probed by μSR L. J. Chang et al.	201
Spin fragmentation in Nd₂Ir₂O₇ and its carrier-doped dependence R. Asih and I. Watanabe	202
Spin dynamics in the S = 1/2 zigzag spin chain magnets K₂CuCl₂SO₄ and Na₂CuCl₂SO₄ M. Fujihala et al.	203
Study of Magnetic Ordering by p-orbital in RbO₂ using μSR F. Astuti	204
Muon spin relaxation study on the new organic spin liquid material λ-(STF)₂GaCl₄ T. Minamidate et al.	205
Superconducting gap symmetry in organic superconductor λ-(BETS)₂GaCl₄ studied by μSR with DFT D. P. Sari et al.	206
Effect of light irradiation on charge carrier dynamics in active layer hybrid solar cells L. Safriani	207
Electron Transport Studies in Biological Molecules with respect to Ageing Science H. Rozak and I. Watanabe	208
Approach to determination of muon stopping sites in proteins Y. Sugawara et al.	209
Time dependence of dipole width obtained by zero-field μSR for Al and Al-0.5 at.%Si K. Nishimura et al.	210
μSR investigation of atomic structure and photocatalytic properties of defects in rutile TiO₂ crystal H. Ariga-Miwa et al.	211
Observation of Li in graphite by muonic x-rays I. Umegaki et al.	212
Development of the in-situ electronic-field-application μSR technique and test application to multiferroic systems R. Asih and I. Watanabe	213
Development of an intense mid-infrared coherent light source for muonic hydrogen spectroscopy S. Kanda et al.	214
3. Radiochemistry and Nuclear Chemistry
Solid-liquid extraction of Mo and W by Aliquat 336 from HCl solutions toward extraction chromatography experiments of Sg Y. Komori et al.	215
Reversed-phase chromatography for element 105, Db with Aliquat 336 resin from 2.7 M and 27 M HF solutions D. Sato et al.	216
Solvent extraction of Rf in the Aliquat 336/HCl system using flow-type extraction apparatus N. Kondo et al.	217
Anion and cation exchanges of Zr, Hf, and Th in H₂SO₄ for chemical study of Rf T. Yokokita et al.	218
Solvent extraction behavior of Zr and Hf with 2-furoyltrifluoroacetone as model experiments for rutherfordium (element 104) K. Ooe et al.	219
Activation cross sections of α-induced reactions on ^natIn for ^117mSn production M. Aikawa et al.	220
Prodution cross sections of ¹⁶⁹Yb and ^167,168,170Tm isotopes in deuteron-induced reactions on ¹⁶⁹Tm M. Saito et al.	221
Production cross sections of ^177gLu in α-induced reactions on ^natYb M. Saito et al.	222
Activation cross sections of alpha-induced reactions on natural tungsten for ¹⁸⁶Re and ¹⁸⁸Re production N. Ukon et al.	223
Measurement of excitation functions of the ^206/207/208Pb(¹¹B, x)²¹²Fr reactions Y. Komori et al.	224
Improved method for preparation of no-carrier added ²⁸Mg tracer H. Kikunaga et al.	225
Production of no-carrier-added barium tracer of ^135mBa S. Yano et al.	226
Trial of astatine separation using column chromatography H. Ikeda et al.	227
Wet chemistry processes utilized in development of ²¹¹Rn/²¹¹At generator for targeted alpha therapy Y. Shin et al.	228
Development of Np standard material for accelerator mass spectrometry A. Yokoyama et al.	229
⁹⁹Ru Mössbauer spectroscopy of Na-ion batteries of Na₂RuO₃ (IV) K. Takahashi et al.	230
Fractionation of Zr-Hf in ferromanganese crusts J. Inagaki et al.	231
Desorption of ⁸⁸Zr from soil with artificial digestive juices T. Kubota et al.	232
4. Radiation Chemistry and Biology
Recruitment of Rad51 and phosphorylated DNA-PKcs after heavy-ion irradiation of human normal fibroblast M. Izumi et al.	233
Low-dose high-LET heavy ion-induced bystander signaling (IV) M. Tomita et al.	234
Results of whole-genome analysis of mahogany mutant K. Tsuneizumi et al.	235
Chromosomal rearrangement induced by high-LET heavy-ion-beam irradiation in Parachlorella kessleri K. Ishii et al.	236
Trials of mutation detection programs to detect structural variations induced by heavy-ion beams in rice R. Morita et al.	237
Comparison of LET effect of heavy-ion beam irradiation in rice Y. Hayashi et al.	238
Relationship between early-flowering mutation and LET-Gy combination of ion beam irradiation in durum wheat K. Murai et al.	239
Analysis of DNA damage response in Cyrtanthus pollen after Ar-ion beam irradiation T. Hirano et al.	240
Isolation of C₄ Flaveria bidentis mutants with reduced quenching of chlorophyll fluorescence from heavy-ion-beam-mutagenized M₂ population T. Ogawa et al.	241
Development of flower color mutations from the light-yellow mutant of spray-mum ‘Southern Chelsea’ by heavy-ion beam re-irradiation M. Tamari et al.	242
Effects of heavy-ion-beam irradiation on survival in Eisenia arborea H. Yamada et al.	243
Argon-ion-beam mutagenesis of the plant-symbiotic edible mushroom Tricholoma matsutake H. Murata et al.	244
Current status of development of ion microbeam device with tapered glass capillary for biological use T. Ikeda et al.	245
Ⅳ. OPERATION RECORDS
Program Advisory Committee meetings for nuclear physics and for materials and life experiments K. Yoneda et al.	247
Beam-time statistics of RIBF experiments K. Yoneda et al.	248
Electric power condition of Wako campus in 2017 E. Ikezawa et al.	249
Operation report on the ring cyclotrons in the RIBF accelerator complex M. Nishimura et al.	250
RILAC operation E. Ikezawa et al.	251
Operation report on the RIKEN AVF cyclotron for 2017 R. Koyama et al.	252
Present status of the liquid-helium supply and recovery system T. Dantsuka	253
Operation of the BigRIPS cryogenic plant K. Kusaka et al.	254
Radiation safety management at RIBF K. Tanaka et al.	255
Operation of the Pelletron tandem accelerator T. Ikeda et al.	257
Operation of fee-based activities by the industrial cooperation team A. Yoshida et al.	258

Ⅴ. EVENTS	259

Ⅵ. ORGANIZATION AND ACTIVITIES OF RIKEN NISHINA CENTER (Activities, Members, Publications & Presentations)	265

Ⅶ. LIST OF PREPRINTS	433

Ⅷ. LIST OF SYMPOSIA, WORKSHOPS & SEMINARS	437

Ⅷ. LIST OF SYMPOSIA, WORKSHOPS & SEMINARS	437

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