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Schury, P.*; Ito, Yuta; Niwase, Toshitaka*; Wada, Michiharu*
Atoms (Internet), 11(10), p.11100134_1 - 11100134_13, 2023/10
U and systematic high-precision atomic mass measurements of neutron-rich Pa-Pu nuclei produced via multinucleon transfer reactionsNiwase, Toshitaka*; Ito, Yuta; 18 of others*
Physical Review Letters, 130(13), p.132502_1 - 132502_6, 2023/03
Times Cited Count：38 Percentile：98.23(Physics, Multidisciplinary)The new isotope U was synthesized and systematic atomic mass measurements of nineteen neutron-rich Pa-Pu isotopes were performed in the multinucleon transfer reactions of the 
U+
Pt system at the KISS facility. The present experimental results demonstrate the crucial role of the multinucleon transfer reactions for accessing unexplored neutron-rich actinide isotopes toward the 
shell gap in this region of nuclides.
and 
shell gap for Ti and V by the first high-precision multireflection time-of-flight mass measurements at BigRIPS-SLOWRIIimura, Shun*; Rosenbusch, M.*; Takamine, Aiko*; Tsunoda, Yusuke*; Wada, Michiharu*; Chen, S.*; Hou, D. S.*; Xian, W.*; Ishiyama, Hironobu*; Yan, S.*; et al.
Physical Review Letters, 130(1), p.012501_1 - 012501_6, 2023/01
Times Cited Count：13 Percentile：88.25(Physics, Multidisciplinary)
-decay spectroscopy of 
TaMukai, Momo*; Hirayama, Yoshikazu*; Watanabe, Yutaka*; Watanabe, Hiroshi*; Koura, Hiroyuki; Jeong, S. C.*; Miyatake, Hiroari*; Brunet, M.*; Ishizawa, Satoshi*; Kondev, F. G.*; et al.
Physical Review C, 105(3), p.034331_1 - 034331_6, 2022/03
Times Cited Count：7 Percentile：72.81(Physics, Nuclear)
-decay-correlated mass measurement of 
Ra using an -TOF detector equipped multireflection time-of-flight mass spectrograph systemNiwase, Toshitaka*; Ito, Yuta; 26 of others*
Physical Review C, 104(4), p.044617_1 - 044617_8, 2021/10
Times Cited Count：6 Percentile：58.46(Physics, Nuclear)
ReWatanabe, Hiroshi*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Andreyev, A. N.; Hashimoto, Takashi*; Kondev, F. G.*; Lane, G. J.*; Litvinov, Yu. A.*; Liu, J. J.*; Miyatake, Hiroari*; et al.
Physics Letters B, 814, p.136088_1 - 136088_6, 2021/03
Times Cited Count：7 Percentile：58.46(Astronomy & Astrophysics)Tanaka, Taiki*; Morita, Kosuke*; Morimoto, Koji*; Kaji, Daiya*; Haba, Hiromitsu*; Boll, R. A.*; Brewer, N. T.*; Van Cleve, S.*; Dean, D. J.*; Ishizawa, Satoshi*; et al.
Physical Review Letters, 124(5), p.052502_1 - 052502_6, 2020/02
Times Cited Count：33 Percentile：85.04(Physics, Multidisciplinary)
= 100 with a multireflection time-of-flight mass spectrographIto, Yuta*; Schury, P.*; Wada, Michiharu*; Arai, Fumiya*; Haba, Hiromitsu*; Hirayama, Yoshikazu*; Ishizawa, Satoshi*; Kaji, Daiya*; Kimura, Sota*; Koura, Hiroyuki; et al.
Physical Review Letters, 120(15), p.152501_1 - 152501_6, 2018/04
Times Cited Count：66 Percentile：92.56(Physics, Multidisciplinary)Masses of 
Es, 
Fm and the transfermium nuclei 
Md, and 
No, produced by hot- and cold-fusion reactions, in the vicinity of the deformed neutron shell closure, have been directly measured using a multi-reflection time-of-flight mass spectrograph. The masses of Es and 
Md were measured for the first time. Using the masses of 
Md as anchor points for decay chains, the masses of heavier nuclei, up to 
Bh and 
Mt, were determined. These new masses were compared with theoretical global mass models and demonstrated to be in good agreement with macroscopic-microscopic models in this region. The empirical shell gap parameter 
derived from three isotopic masses was updated with the new masses and corroborate the existence of the deformed neutron shell closure for Md and Lr.
Hirose, Kentaro; Nishio, Katsuhisa; Makii, Hiroyuki; Orlandi, R.; Tsukada, Kazuaki; Asai, Masato; Sato, Tetsuya; Ito, Yuta; Suzaki, Fumi; Tanaka, Shoya*; et al.
no journal, ,
Makii, Hiroyuki; Orlandi, R.; Ishii, Tetsuro; Hirose, Kentaro; Tsukada, Kazuaki; Nishio, Katsuhisa; Asai, Masato; Niwase, Toshitaka*
no journal, ,
Sugiyama, Koichi*; Go, Shintaro*; Tomimatsu, Taro*; Kai, Tamito*; Nagae, Daisuke*; Ishibashi, Yuichi*; Matsunaga, Sotaro*; Nagata, Yuto*; Nishibata, Hiroki*; Washiyama, Kohei*; et al.
no journal, ,
We have successfully performed in-beam gamma-ray spectroscopy using the isomer-scope technique to study excited-state structure of neutron-rich heavy-actinide nuclei. The neutron-rich heavy-actinide nuclei were produced in the multinucleon-transfer reactions with a 
Cm target and 
O projectiles accelerated with the JAEA tandem accelerator. Projectile-like scattered particles were detected with Si E-
E telescopes placed at the backward angle, and target-like scattered particles of isomers were caught by an annular aluminum plate placed at about 60-mm downstream from the target. Four Ge detectors and 4 LaBr detectors were placed at the periphery of the aluminum plate, and detected gamma rays from the isomers. Gamma rays emitted from the actinide isomers were successfully observed with a good sensitivity owing to the tungsten shield placed between the target and the detectors.
Asai, Masato; Ishibashi, Yuichi*; Niwase, Toshitaka*; Makii, Hiroyuki; Ito, Yuta; Sato, Tetsuya; Tsukada, Kazuaki; Sakaguchi, Satoshi*; Morita, Kosuke*; Watanabe, Yutaka*; et al.
no journal, ,
Solar cells for power generation can be used as a high-energy heavy-ion detector because it has diode characteristics. To utilize the solar cells for fission-fragment measurements, we have investigated the response (energy resolution and pulse height defect) of a solar cell to heavy ions of various nuclides with several different energies.
Hirose, Kentaro; Nishio, Katsuhisa; Makii, Hiroyuki; Orlandi, R.; Suzaki, Fumi; Tsukada, Kazuaki; Asai, Masato; Ito, Yuta; Watanabe, Yutaka*; Hirayama, Yoshikazu*; et al.
no journal, ,
no abstracts in English
Np isomerAsai, Masato; Suekawa, Yoshihide*; Higashi, Masato*; Kamada, Hiroki*; Tobe, Teruhisa*; Andreyev, A. N.; Hirose, Kentaro; Ito, Yuta; Makii, Hiroyuki; Nishio, Katsuhisa; et al.
no journal, ,
We have carried out experiments to study nuclear structure of the new isomer 
Np which we discovered recently. The Np was produced in the reaction of 
U target with 
Li beam at JAEA tandem accelerator, and was mass-separated with an on-line isotope separator (ISOL). The half-life was determined accurately through LX-ray measurements. The 
transition emitted by following the isomeric transition was successfully observed through LX- coincidence measurements. Moreover, the multipolarities of the transitions were determined with internal-conversion electron measurements. On the basis of these experimental results, We have clarified excitation energy, spin-parity, and nuclear structure of Np.
Np isomer and its decay propertiesAsai, Masato; Suekawa, Yoshihide*; Higashi, Masato*; Kamada, Hiroki*; Tobe, Teruhisa*; Andreyev, A. N.; Hirose, Kentaro; Ito, Yuta; Makii, Hiroyuki; Nishio, Katsuhisa; et al.
no journal, ,
A new isomer Np with a half-life of 
9 min has been discovered. It was produced in the reaction of U target with Li beam at JAEA tandem accelerator, and was identified through characteristic X-ray measurement and mass separation with an on-line isotope separator (ISOL). Gamma-ray singles, gamma-gamma coincidence, and internal-conversion electron measurements were performed. It was revealed that the Np decays mostly through an isomeric E4 transition followed by an M1 transition, and that the spin-parity of the Np should be 5
. The results are introduced in detail, and the nuclear structure of the Np are discussed.
