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spectroscopy of superheavy nucleiAsai, Masato
no journal, ,
- spectroscopy of superheavy nuclei have been performed at JAEA tandem accelerator. The nuclei 
No, 
No, 
No, and 
Rf were produced by the cold-fusion reactions with a 
Cm target, and were transported with a gas-jet transport technique to a rotating wheel - detection system, where rays associated with the decays of these nuclei were observed. Energies, spin-parities, and neutron configurations of the ground- as well as excited states in these nuclei have been successfully identified. These results suggest that the order of neutron orbitals should be inverted between the neutron number 152 and 162. The cause of this inversion is discussed through the comparison with theoretical calculations.
Koura, Hiroyuki
no journal, ,
no abstracts in English
Sato, Hiroki; Imai, Nobuaki*; Ishiyama, Hironobu*; Ozawa, Akira*; Jeong, S.-C.*; Nishio, Katsuhisa; Hashimoto, Takashi*; Hirayama, Yoshikazu*; Makii, Hiroyuki*; Mitsuoka, Shinichi; et al.
no journal, ,
no abstracts in English
Segawa, Mariko; Nagai, Yasuki*; Masaki, Tomohiro*; Temma, Yasuyuki*; Shima, Tatsushi*; Makii, Hiroyuki*; Mishima, Kenji*; Ueda, Hitoshi*; Nakayoshi, Akira*; Ota, Takeshi*; et al.
no journal, ,
Re-Os pair is known as the most promising nuclear cosmochronometer with considerable potential. However, there remains non-trivial problems related to an excited neutron capture reaction of Os at a stellar temperature. Firstly, Os is produced and depleted by the slow process nucleosynthesis. Hence, it is necessary to obtain both the production and depletion rates of Os. Secondly, Os is depleted not only by its ground state neutron capture reaction but also by an excited state neutron capture reaction of Os in a stellar temperature. In the present study, we have measured the neutron capture reaction cross sections for 
Os, Os and 
Os accurately and neutron inelastic scattering reaction cross section for Os off the ground state of Os to its 9.75-keV first excited statein the neutron energy range from 10 to 100 keV. The measurements of the neutron capture reactions have been carried out by detecting a prompt -ray by means fan anti-Compton NaI(Tl) spectrometer. The (n, n') reaction cross section for Os has been measured with use of four 
Li-glass scintillation detectors. Based on these new capture cross sections, we reestimate on the basis of a careful reaction cross section calculation the correction factor F for the neutron capture on the 9.75-keV first excited state in Os as a function of stellar temperature, as required to derive the age of the galaxy within the Re-Os chronology.
Utsuno, Yutaka; Brown, B. A.*; Otsuka, Takaharu*; Homma, Michio*; Mizusaki, Takahiro*
no journal, ,
no abstracts in English
Hayakawa, Takehito; Shizuma, Toshiyuki; Chiba, Satoshi; Kajino, Toshitaka*; Hatsukawa, Yuichi; Iwamoto, Nobuyuki; Shinohara, Nobuo; Harada, Hideo
no journal, ,
no abstracts in English
Maruyama, Toshiki; Maruyama, Tomoyuki*; Tatsumi, Toshitaka*; Chiba, Satoshi
no journal, ,
no abstracts in English
Hashimoto, Shintaro; Ogata, Kazuyuki*; Chiba, Satoshi; Yahiro, Masanobu*
no journal, ,
The incomplete or complete fusion reaction, in which a part or the whole of a projectile, respectively, is absorbed by a target, proceeds through a compound process. There is a long history of the study of the compound reaction. However, the incomplete fusion process is not sufficiently well understood. Recently, the study of neutron-rich nuclei has been studied, and the understanding of the incomplete fusion process in the reaction involving unstable nuclei is required. Since breakup of a weakly bound nucleus, such as deuteron, takes place easily in the reaction, the model taking into account the breakup process is required for the analysis. We applied the Continuum-Discretized Coupled-Channels (CDCC) method to the analysis in order to understand the reaction mechanism of incomplete fusion. In the present paper, we show results of each fusion cross section in the deuteron induced reaction on 
Li target, and discuss the importance of the incomplete fusion process.
Pb using laser Compton scattering raysShizuma, Toshiyuki; Hayakawa, Takehito; Ogaki, Hideaki*; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*; Kikuzawa, Nobuhiro; Tamii, Atsushi*; Nakada, Hitoshi*
no journal, ,
no abstracts in English
Yamaguchi, Mitsutaka*; Kawachi, Naoki; Watanabe, Shin*; Odaka, Hirokazu*; Takeda, Shinichiro*; Ishikawa, Shinnosuke*; Aono, Hiroyuki*; Takahashi, Tadayuki*; Arakawa, Kazuo; Nakano, Takashi*
no journal, ,
no abstracts in English