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BkAsai, Masato; Tsukada, Kazuaki; Ichikawa, Shinichi; Sakama, Minoru*; Haba, Hiromitsu*; Nagame, Yuichiro; Nishinaka, Ichiro; Akiyama, Kazuhiko; Toyoshima, Atsushi; Kaneko, Tetsuya*; et al.
European Physical Journal A, 16(1), p.17 - 19, 2003/01
Times Cited Count：8 Percentile：50.24(Physics, Nuclear)The new isotope Bk has been identified for the first time using a gas-jet coupled on-line isotope separator at the JAERI tandem accelerator facility. Characteristic X rays and three 
transitions associated with the EC decay of Bk have been observed, and the half-life was determined to be 4.6 min. The half-life value and the observed -ray energies and intensities can be consistently explained as a consequence of the allowed EC transition of ![$$pi 7/2^{+}[633]$$](/search/images/EROHA0JAG2XTEXT1FN4VWNRTGNOSI.gif)
![$$nu 7/2^{+}[624]$$](/search/images/EROG23JAG2XTEXT1FN4VWNRSGROSI.gif)
.
Iwai, Yasunori; Yamanishi, Toshihiko; Nishi, Masataka
Journal of Nuclear Science and Technology, 36(1), p.95 - 104, 1999/01
Times Cited Count：12 Percentile：66.16(Nuclear Science & Technology)no abstracts in English
25, 1997, JAERI, Tokai, JapanMitsuoka, Shinichi; Ikezoe, Hiroshi; Iwamoto, Akira; Nagame, Yuichiro
JAERI-Conf 97-009, 106 Pages, 1997/07
no abstracts in English
Koizumi, Mitsuo; Osa, Akihiko; Sekine, Toshiaki; *
Nuclear Instruments and Methods in Physics Research B, 126(1-4), p.100 - 104, 1997/00
Times Cited Count：8 Percentile：56.73(Instruments & Instrumentation)no abstracts in English
helium peak in a deuterium atmosphere using a modified high-resolution quadrupole mass spectrometerHiroki, Seiji; Abe, Tetsuya; Murakami, Yoshio
Review of Scientific Instruments, 65(6), p.1912 - 1917, 1994/06
Times Cited Count：20 Percentile：82.67(Instruments & Instrumentation)no abstracts in English
Sekine, Toshiaki
Dai-4-Pan Jikken Kagaku Kouza, 14; Kaku, Hoshasen, p.140 - 156, 1992/00
no abstracts in English
Eu in a reactor; The cross sections of 
Eu and Eu; ;
Appl.Radiat.Isot., 38(7), p.513 - 516, 1987/07
no abstracts in English
R.Kirchner*; O.Klepper*; D.Schardt*;
Nuclear Instruments and Methods in Physics Research B, 26, p.235 - 239, 1987/00
Times Cited Count：20 Percentile：86.94(Instruments & Instrumentation)no abstracts in English
Mn; Gamow-Teller quenching in fp-shell nuclei; J.Cerny*; R.Kirchner*; O.Klepper*; V.T.Koslowsky*; A.Plochocki*; E.Roeckl*; D.Schardt*; B.Sherrill*
Nuclear Physics A, 467, p.93 - 114, 1987/00
Times Cited Count：31 Percentile：82.59(Physics, Nuclear)no abstracts in English
-Decay Energy and Neutron Separation Energy from the Atomic Mass Formula with Empirical Shell Terms*; *; *
JAERI-M 83-025, 142 Pages, 1983/02
no abstracts in English
; ; ;
JAERI-M 82-070, 13 Pages, 1982/07
no abstracts in English
LrAsai, Masato; Kamada, Hiroki*; Shigekawa, Yudai*; Tsukada, Kazuaki; Sato, Tetsuya; Toyoshima, Atsushi; Mitsukai, Akina; Nagame, Yuichiro; Nishio, Katsuhisa; Hirose, Kentaro; et al.
no journal, ,
To clarify the fission mechanism of mass-symmetric spontaneous fissions observed around the neutron-rich Fm region, we have measured kinetic energies and mass distribution of spontaneous-fission fragments in this nuclear region precisely. The experiment was performed at the JAEA tandem accelerator facility using an on-line isotope separator (ISOL). The mass-separated Lr nuclei were implanted into thin foil, and two fragments of their spontaneous fission were coincidently measured with two Si detectors. The spontaneous fission of Lr was found to show a narrow symmetric mass distribution. On the other hand, their total kinetic energy TKE was found to be low, which is apparently different from the high-TKE symmetric fissions observed in the Fm isotopes. This indicates that the fission mechanisms of these two symmetric fissions are different.
Do, V. K.; Kitamura, Kiyoshi; Horita, Takuma; Furuse, Takahiro
no journal, ,
We report an application of automated devices for multi-step chemical separation for nickel and an idea of subsequent quantification for Ni-59 using ICP-QQQ-MS. Nickel is separated on our selected automated instruments applying a conventional separation scheme. The obtained chemical recovery for Ni standard carrier was 89.8% (relative standard deviation, RSD of 2.9%, n = 3), which is consistent with the manually obtained recovery of 87.0% (RSD = 2.2%, n = 3). The quantification of Ni-59 by ICP-QQQ-MS was examined. Accordingly, the intensity of 59Ni could be deduced from an intensity correction curve for natural isotopes of nickel. The proposed analytical method is more rapid and less laborious, being expected to reduce radiation exposure to workers.
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.
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.
