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Journal Articles

Production of polarized beam of unstable nuclei via ion surface interaction at grazing incidence

Otsubo, Takashi*; Oya, Susumu*; Goto, Jun*; *; Muto, Suguru*; Osa, Akihiko; Koizumi, Mitsuo; Sekine, Toshiaki

JAERI-Review 99-025, TIARA Annual Report 1998, p.206 - 207, 1999/10

no abstracts in English

Journal Articles

Polarized beam of unstable nuclei via ion beam surface interaction at grazing incidence

*; *; *; *; *; *; *; Muto, Suguru*; Osa, Akihiko; Koizumi, Mitsuo; et al.

Hyperfine Interactions, 120-121(1-4), p.695 - 699, 1999/00

no abstracts in English

Journal Articles

Recent studies of unstable nuclei far from stability with the on-line isotope separators of JAERI

Sekine, Toshiaki; Ichikawa, Shinichi; Osa, Akihiko; Koizumi, Mitsuo; Iimura, Hideki; Tsukada, Kazuaki; Nishinaka, Ichiro; Hatsukawa, Yuichi; Nagame, Yuichiro; Asai, Masato*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 239(1), p.127 - 131, 1999/00

 Times Cited Count:2 Percentile:21.95(Chemistry, Analytical)

no abstracts in English

Journal Articles

Low-lying O$$^{+}$$ states in $$^{124-130}$$Ba

Asai, Masato*; *; Osa, Akihiko; Koizumi, Mitsuo; Sekine, Toshiaki; *; Yamamoto, Hiroshi*; Kawade, Kiyoshi*

"Fuanteikaku No Rikogaku Oyobi Kaku Keisokuho(II)" Ni Kansuru Semmon Kenkyukai Hokokusho, 0, p.97 - 100, 1997/00

no abstracts in English

Journal Articles

A Five-HPGe detector system for $$gamma$$-$$gamma$$ angular correlation measurements for mass-separated short-lived nuclei

Asai, Masato*; Kawade, Kiyoshi*; *; Osa, Akihiko; Koizumi, Mitsuo; Sekine, Toshiaki

Nuclear Instruments and Methods in Physics Research A, 398, p.265 - 275, 1997/00

 Times Cited Count:5 Percentile:46.89(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Gamma-gamma angular correlation measurements at TIARA-ISOL

Asai, Masato*; *; Osa, Akihiko; Koizumi, Mitsuo; Sekine, Toshiaki; *; Yamamoto, Hiroshi*; Kawade, Kiyoshi*

KURRI-KR-3, 0, p.36 - 40, 1996/00

no abstracts in English

Journal Articles

Low-spin level structure of $$^{126}$$Ba investigated by $$gamma$$-$$gamma$$ angular correlation measurement

Asai, Masato*; *; Osa, Akihiko; Koizumi, Mitsuo; Sekine, Toshiaki; *; Yamamoto, Hiroshi*; Kawade, Kiyoshi*

ENAM 95: Int. Conf. on Exotic Nuclei and Atomic Masses, 0, p.539 - 540, 1995/00

no abstracts in English

Journal Articles

Decay of the new isotope $$^{127}$$Pr

Sekine, Toshiaki; Osa, Akihiko; Koizumi, Mitsuo; ; Asai, Masato*; Yamamoto, Hiroshi*; Kawade, Kiyoshi*

Z. Phys., A, 349, p.143 - 146, 1994/00

no abstracts in English

Oral presentation

Nonlinear optical response of molecules rotationally excited by impulsive Raman scattering

Yokoyama, Keiichi; Kobayashi, Takanori*

no journal, , 

We report a consideration on the non-linear optical response of molecules rotationally excited by impulsive Raman scattering. An ensemble of molecules which are cascadedly excited and de-excited among the rotational levels by a several numbers of Raman transitions is not uniform in spatial coherence and depend on the number of transition the molecule undergoes. Therefore, there is a possibility to obtain signal waveforms which cannot be explained by the conventional analysis method which ignores the non-locality of the density operator. In this study, we adopted non-local density operator to calculate non-linear optical response in such case. As a result, we predicted that significant angular dependence of observed signal appear due to the spherical wave of input pump laser pulse. We qualitatively confirmed the analysis reproduce the observed waveform.

Oral presentation

Spontaneous fission measurements for nuclei around neutron-rich Fm region produced by using an $$^{254}$$Es target

Asai, Masato; Tsukada, Kazuaki; Hirose, Kentaro; Toyoshima, Atsushi; Tomitsuka, Tomohiro; Chiera, N. M.; Ito, Yuta; Makii, Hiroyuki; Nagame, Yuichiro; Nishio, Katsuhisa; et al.

no journal, , 

Spontaneous fissions of $$^{256}$$Fm, $$^{258}$$Fm, and $$^{259}$$Lr have been measured using an $$^{254}$$Es target at the JAEA Tandem Accelerator Facility. These three nuclei show different fission properties: the asymmetric fission, the high total-kinetic-energy (TKE) symmetric fission, and the low TKE symmetric fission, and the mechanisms of these three fissions should be very different. It is of great interest to elucidate how these differences occur. We have produced $$^{256,258}$$Fm in multinucleon-transfer reactions with a $$^{254}$$Es target and $$^{18}$$O projectiles, and produced $$^{259}$$Lr in the $$^{248}$$Cm($$^{15}$$N,4n) fusion-evaporation reaction. The reaction products were mass-separated with a gas-jet-coupled on-line isotope separator, and were delivered into a rotating wheel alpha- and fission-fragment detection system. By comparing the mass and TKE distributions deduced from the present experimental data, we will discuss the differences in fission mechanism among $$^{256}$$Fm, $$^{258}$$Fm, and $$^{259}$$Lr.

Oral presentation

Spontaneous fission studies for neutron-rich Fm and Lr isotopes

Asai, Masato; Tsukada, Kazuaki; Hirose, Kentaro; Toyoshima, Atsushi*; Tomitsuka, Tomohiro*; Chiera, N. M.*; Ito, Yuta; Makii, Hiroyuki; Nagame, Yuichiro*; Nishio, Katsuhisa; et al.

no journal, , 

We have studied spontaneous fission of neutron-rich Fm and Lr isotopes. The neutron-rich Fm isotopes were produced with the $$^{254}$$Es target and the $$^{18}$$O beam delivered by the JAEA tandem accelerator. The neutron-rich Lr isotope were produced with the $$^{248}$$Cm target and the $$^{15}$$N beam. Reaction products were mass-separated with an on-line isotope separator (ISOL), which enabled us to obtain non-contaminated samples and to measure fission fragments precisely. From the deduced fission-fragment mass and total kinetic energy distributions, we have obtained a new insight into the competition between the symmetric and asymmetric fission which is characteristic in this neutron-rich region.

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