Kyushu University Academic Staff Educational and Research Activities Database
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Masato Asai Last modified date:2020.06.13

Other Organization

 Reseacher Profiling Tool Kyushu University Pure
Research Group for Heavy Element Nuclear Science, Advanced Science Research Center, Japan Atomic Energy Agency .
Academic Degree
Country of degree conferring institution (Overseas)
Field of Specialization
Nuclear Physics (Experiment)
Total Priod of education and research career in the foreign country
Outline Activities
1. Nuclear structure studies for heavy and superheavy nuclei
Nuclear structure of heavy and superheavy nuclei are studied experimentally with alpha-decay spectroscopy and gamma-ray spectroscopy at JAEA Tandem Accelerator Facility using an on-line isotope separator (ISOL) and a gas-jet transport technique, and also using the gas-filled recoil ion separator GARIS at RIKEN Nishina Center.

2. Studies on chemical properties of superheavy elements
Chemical properties of superheavy elements are studied experimentally. Compound formation of elements 104 (Rf), 105 (Db), and 106 (Sg) have been studied at JAEA Tandem Accelerator and at RIKEN Nishina Center, and adsorption properties of elements 112 (Cn), 113 (Nh), 114 (Fl), and 115 (Mc) are being measured at GSI in Germany. The first ionization potential of element 103 (Lr) was measured for the first time with the newly developed surface ionization technique.

3. Studies on nuclear fission mechanism for superheavy nuclei
The abrupt change of fission fragment mass distribution from typical asymmetric mass distribution to sharp symmetric one observed in the region of neutron-rich Fm isotopes is investigated to clarify the mechanism of fission.
Research Interests
  • Nuclear structure studies for heavy and superheavy nuclei
    keyword : Superheavy Nuclei, Heavy Actinide Nuclei, Nuclear Structure, Nuclear Spectroscopy
  • Experimental studies on chemical properties of superheavy elements
    keyword : Superheavy Elements, Periodic Table of the Elements, Chemical Properties, Ionization Energy
  • Studies on nuclear fission mechanism for superheavy nuclei
    keyword : Nuclear Fission, Symmetric Fission, Superheavy Nuclei
Academic Activities
1. Asai M., Hessberger F. P., Lopez-Martens A., Nuclear structure of elements with 100 <= Z <= 109 from alpha spectroscopy, NUCLEAR PHYSICS A, 10.1016/j.nuclphysa.2015.06.011, 944, 308-332, 2015.12.
2. Sato T. K., Asai M., Borschevsky A., Stora T., Sato N., Kaneya Y., Tsukada K., Duellmann Ch E., Eberhardt K., Eliav E., Ichikawa S., Kaldor U., Kratz J. V., Miyashita S., Nagame Y., Ooe K., Osa A., Renisch D., Runke J., Schaedel M., Thoerle-Pospiech P., Toyoshima A., Trautmann N., Measurement of the first ionization potential of lawrencium, element 103, NATURE, 10.1038/nature14342, 520, 209-211, 2015.04.
3. Even J., Yakushev A., Duellmann Ch E., Haba H., Asai M., Sato T. K., Brand H., Di Nitto A., Eichler R., Fan F. L., Hartmann W., Huang M., Jaeger E., Kaji D., Kanaya J., Kaneya Y., Khuyagbaatar J., Kindler B., Kratz J. V., Krier J., Kudou Y., Kurz N., Lommel B., Miyashita S., Morimoto K., Morita K., Murakami M., Nagame Y., Nitsche H., Ooe K., Qin Z., Schaedel M., Steiner J., Sumita T., Takeyama M., Tanaka K., Toyoshima A., Tsukada K., Tuerler A., Usoltsev I., Wakabayashi Y., Wang Y., Wiehl N., Yamaki S., Synthesis and detection of a seaborgium carbonyl complex, SCIENCE, 10.1126/science.1255720, 345, 1491-1493, 2014.09.
4. Asai M., Tsukada K., Sakama M., Haba H., Ichikawa T., Ishii Y., Toyoshima A., Ishii T., Nishinaka I., Nagame Y., Kasamatsu Y., Shibata M., Kojima Y., Hayashi H., Ground-state Configuration of the N = 157 Nucleus 259No, PHYSICAL REVIEW C, 10.1103/PhysRevC.87.014332, 87, 1, 014332-1-6, 2013.01.
5. Asai M., Tsukada K., Haba H., Ishii Y., Ichikawa T., Toyoshima A., Ishii T., Nagame Y., Nishinaka I., Kojima Y., Sueki K., Neutron one-quasiparticle states in 251Fm151 populated via the alpha decay of 255No, PHYSICAL REVIEW C, 10.1103/PhysRevC.83.014315, 83, 1, 014315-1-12, 2011.01.
6. Asai M., Tsukada K., Sakama M., Ichikawa S., Ishii T., Nagame Y., Nishinaka I., Akiyama K., Osa A., Oura Y., Sueki K., Shibata M., Experimental Identification of Spin-Parities and Single-Particle Configurations in 257No and Its alpha-Decay Daughter 253Fm, PHYSICAL REVIEW LETTERS, 10.1103/PhysRevLett.95.102502, 95, 10, 102502-1-4, 2005.09.
7. Asai M., Sakama M., Tsukada K., Ichikawa S., Haba H., Nishinaka I., Nagame Y., Goto S., Kojima Y., Oura Y., Nakahara H., Shibata M., Kawade K., Proton-neutron configurations in 236g,mAm and its EC-decay daughter 236Pu, EUROPEAN PHYSICAL JOURNAL A, 10.1140/epja/i2004-10096-6, 23, 3, 395-400, 2004.12.
8. Asai M, Sakama M, Tsukada K, Ichikawa S, Haba H, Nishinaka I, Nagame Y, Goto S, Kojima Y, Nakahara H, Oura Y, Shibata M, Kawade K, EC and alpha decays of 235Am, EUROPEAN PHYSICAL JOURNAL A, 10.1140/epja/i2004-10044-6, 22, 3, 411-416, 2004.12.
9. Asai M., Ichikawa S., Tsukada K., Sakama M., Shibata M., Kojima Y., Osa A., Nishinaka I., Nagame Y., Kawade K., Tachibana T., Beta-decay half-lives of new neutron-rich isotopes 167,168Tb and levels in 167,168Dy, PHYSICAL REVIEW C, 10.1103/PhysRevC.59.3060, 59, 6, 3060-3065, 1999.06.
10. Asai M., Sekine T., Osa A., Koizumi M., Kojima Y., Shibata M., Yamamoto H., Kawade K., Energy systematics of low-lying 0+ states in neutron-deficient Ba nuclei, PHYSICAL REVIEW C, 10.1103/PhysRevC.56.3045, 56, 6, 3045-3053, 1997.12.
Membership in Academic Society
  • The Japan Society of Nuclear and Radiochemical Sciences
  • The Physical Society of Japan
  • Poster Title: Alpha Fine Structure Spectroscopy for Heavy- and Transactinide Nuclei