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Journal Articles

$$beta$$-decay half-lives of new neutron-rich rare-earth isotopes $$^{159}$$Pm, $$^{162}$$Sm, and $$^{166}$$Gd

Ichikawa, Shinichi; Asai, Masato; Tsukada, Kazuaki; Haba, Hiromitsu*; Nagame, Yuichiro; Shibata, Michihiro*; Sakama, Minoru*; Kojima, Yasuaki*

Physical Review C, 71(6), p.067302_1 - 067302_4, 2005/06

https://doi.org/10.1103/PhysRevC.71.067302
 Times Cited Count：19 Percentile：74.01(Physics, Nuclear)

The new neutron-rich raer-earth isotopes $$^{159}$$Pm, $$^{162}$$Sm, and $$^{166}$$Gd produced in the proton-induced fission of 238U were identified using the JAERI on-line isotope separator (JAERI-ISOL) coupled to a gas-jet transport sysetm. The half-lives of $$^{159}$$Pm, $$^{162}$$Sm, and $$^{166}$$Gd were determined to be 1.5$$pm$$0.2s, 2.4$$pm$$0.5s, and 4.8$$pm$$1.0s, respectively. The partial decay scheme of $$^{166}$$Gd wes constructed for $$gamma$$-$$gamma$$ coincidence data. The improved half-life values of 25.6$$pm$$2.2s wes obtained for the previously identified isotope $$^{166}$$Tb. The half-lives measured in the present study are in good agreement with the theoretical predictions calculated by the second generation of the gross theory with the atomic masses evaluated by the Audei and Wapstra.

JAEA Reports

Catalog of gamma-rays unplaced in radioactive decay schemes

; Kitao, Kensuke*

JAERI-M 91-037, 332 Pages, 1991/03

JAERI-M-91-037.pdf:28.72MB

no abstracts in English

Journal Articles

Photoexcitation of the 7310-keV level in $$^{1}$$$$^{2}$$$$^{0}$$Sn and the 6517-keV level in $$^{1}$$$$^{1}$$$$^{7}$$Sn

Journal of the Physical Society of Japan, 45(4), p.1085 - 1091, 1978/04

https://doi.org/10.1143/JPSJ.45.1085
 Times Cited Count：0

no abstracts in English

Oral presentation

Alpha-decay spectroscopy of $$^{261}$$Rf

Asai, Masato; Tsukada, Kazuaki; Sato, Nozomi*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Tetsuro; Miyashita, Sunao*; Kaneya, Yusuke; Shima, Yosuke*; Shibata, Michihiro*

no journal, , 

Alpha-gamma coincidence and high-resolution $$alpha$$ fine-structure measurements were performed for the $$alpha$$ decay of $$^{261}$$Rf. Two $$gamma$$ lines associated with the $$alpha$$ decay of $$^{261}$$Rf were clearly observed, and more precise $$alpha$$-energy spectrum than before were obtained. It was found that the literature value (8.28 MeV) of the $$alpha$$-transition energy of $$^{261}$$Rf was incorrect, and that the $$alpha$$-decay scheme of $$^{261}$$Rf should contain several low-energy cascade $$gamma$$ transitions. On the basis of these results and literature data of $$^{261m}$$Rf, we will discuss nuclear structure of superheavy nuclei around this region as well as the level structure of $$^{261}$$Rf and its daughter nucleus $$^{257}$$No.

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