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Journal Articles

Identification of the new isotope $$^{241}$$Bk

Asai, 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:51.33(Physics, Nuclear)

The new isotope $$^{241}$$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 $$gamma$$ transitions associated with the EC decay of $$^{241}$$Bk have been observed, and the half-life was determined to be 4.6 min. The half-life value and the observed $$gamma$$-ray energies and intensities can be consistently explained as a consequence of the allowed EC transition of $$pi 7/2^{+}[633]$$ $$rightarrow$$ $$nu 7/2^{+}[624]$$.

Journal Articles

A Steady-state simulation model of gas separation system by hollow-filament type membrane module

Iwai, Yasunori; Yamanishi, Toshihiko; Nishi, Masataka

Journal of Nuclear Science and Technology, 36(1), p.95 - 104, 1999/01

 Times Cited Count:11 Percentile:65.07(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Proceedings of Symposium on Nuclear Fusion and Fission of Heavy Elements, March 24$$sim$$25, 1997, JAERI, Tokai, Japan

Mitsuoka, Shinichi; Ikezoe, Hiroshi; Iwamoto, Akira; Nagame, Yuichiro

JAERI-Conf 97-009, 106 Pages, 1997/07

JAERI-Conf-97-009.pdf:4.02MB

no abstracts in English

Journal Articles

Development of a laser ion source with pulsed ion extraction

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:57.55(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Detection of a 10$$^{-4}$$ helium peak in a deuterium atmosphere using a modified high-resolution quadrupole mass spectrometer

Hiroki, Seiji; Abe, Tetsuya; Murakami, Yoshio

Review of Scientific Instruments, 65(6), p.1912 - 1917, 1994/06

 Times Cited Count:20 Percentile:83.24(Instruments & Instrumentation)

no abstracts in English

Journal Articles

2.3.1,オンラインアイソトープ分離装置

Sekine, Toshiaki

Dai-4-Pan Jikken Kagaku Kouza, 14; Kaku, Hoshasen, p.140 - 156, 1992/00

no abstracts in English

Journal Articles

Triple neutron capture of $$^{1}$$$$^{5}$$$$^{3}$$Eu in a reactor; The cross sections of $$^{1}$$$$^{5}$$$$^{4}$$Eu and $$^{1}$$$$^{5}$$$$^{5}$$Eu

; ;

Appl.Radiat.Isot., 38(7), p.513 - 516, 1987/07

no abstracts in English

Journal Articles

Ion source development for the GSI on-line isotope separator

R.Kirchner*; O.Klepper*; D.Schardt*;

Nuclear Instruments and Methods in Physics Research B, 26, p.235 - 239, 1987/00

 Times Cited Count:18 Percentile:85.82(Instruments & Instrumentation)

no abstracts in English

Journal Articles

The beta decay of $$^{4}$$$$^{8}$$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:29 Percentile:81.7(Physics, Nuclear)

no abstracts in English

Oral presentation

Measurement of mass-symmetric spontaneous fission of $$^{259}$$Lr

Asai, 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 $$^{259}$$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 $$^{259}$$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.

Oral presentation

Development of an analytical method for nickel isotopes using an automated sample preparation system and ICP-QQQ-MS

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.

Oral presentation

Discovery of $$^{234}$$Np isomer and its decay properties

Asai, 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 $$^{234m}$$Np with a half-life of $$sim$$9 min has been discovered. It was produced in the reaction of $$^{233}$$U target with $$^{6}$$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 $$^{234m}$$Np decays mostly through an isomeric E4 transition followed by an M1 transition, and that the spin-parity of the $$^{234m}$$Np should be 5$$^{+}$$. The results are introduced in detail, and the nuclear structure of the $$^{234m}$$Np are discussed.

Oral presentation

Decay and nuclear structure of $$^{234}$$Np isomer

Asai, 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 $$^{234m}$$Np which we discovered recently. The $$^{234m}$$Np was produced in the reaction of $$^{233}$$U target with $$^{6}$$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 $$gamma$$ transition emitted by following the isomeric transition was successfully observed through LX-$$gamma$$ coincidence measurements. Moreover, the multipolarities of the $$gamma$$ 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 $$^{234m}$$Np.

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