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Massey, D.*; Williams, C. D.*; Mu, J.*; Masters, A. J.*; Motokawa, Ryuhei; Aoyagi, Noboru; Ueda, Yuki; Antonio, M. R.*
Journal of Physical Chemistry B, 127(9), p.2052 - 2065, 2023/03
Times Cited Count：0 Percentile：0(Chemistry, Physical)Utsuno, Yutaka; Shimizu, Noritaka*; Otsuka, Takaharu*; Yoshida, Toru*; Tsunoda, Yusuke*
Physical Review Letters, 114(3), p.032501_1 - 032501_5, 2015/01
Times Cited Count：37 Percentile：85.32(Physics, Multidisciplinary)In usual even-even nuclei, 
, 
, 
states are known to be connected via strong 
transitions. The recently observed 
state in the neutron-rich nucleus 
S has a strongly hindered transition to the state. We report the origin of this strong hindrance in this paper. While shell-model calculations reproduce the hindrance, their many-body wave functions are too complicated for one to understand the nature. In this study, we introduce a novel method to obtain wave functions in the intrinsic frame by performing the variation after angular-momentum projection. The , states are dominated by the usual 
state, whereas for the 
level the 
state is lower than state, which causes the hindrance. We also account for similar hindrance in 
S in this framework. The 
level is the lightest-mass high-
isomer ever found.
Saeki, Masakatsu; Nakada, Masami; Kawasaki, Takeshi*; Nishimura, Tatsuru*; Kitazawa, Takafumi*; Takeda, Masuo*
Journal of Radioanalytical and Nuclear Chemistry, 270(2), p.379 - 384, 2006/11
Times Cited Count：3 Percentile：24.08(Chemistry, Analytical)no abstracts in English
isomer in neutron-rich 
WShizuma, Toshiyuki; Hayakawa, Takehito; Mitarai, Shiro*; Morikawa, Tsuneyasu*; Ishii, Tetsuro
Physical Review C, 71(6), p.067301_1 - 067301_4, 2005/06
Times Cited Count：6 Percentile：45.52(Physics, Nuclear)Excited states in neutron-rich W have been populated via deep inelastic collisions of a 630-MeV 
Se beam on a 
W target. Projectile-like fragments were measured by an annular Si detector for reaction channel selection. Delayed 
rays from target residues were detected by means of the so-called recoil shadow technique. A new isomer at 411 keV, based on the 
[615] Nilsson configuration, has been identified with the half-life of 1.56(28) 
s. The decay rates of the isomers are discussed in terms of the quantum number by comparison with the systematics from the neighboring nuclei.
Np M
essbauer parameter and crystal structure of neptunyl compoundsSaeki, Masakatsu
Nihon Kessho Gakkai-Shi, 46(6), p.415 - 420, 2004/12
no abstracts in English
Ba populated by deep inelastic collisionsShizuma, Toshiyuki; Gan, Z. G.*; Ogawa, Kengo*; Nakada, Hitoshi*; Oshima, Masumi; Toh, Yosuke; Hayakawa, Takehito; Hatsukawa, Yuichi; Sugawara, Masahiko*; Utsuno, Yutaka; et al.
European Physical Journal A, 20(2), p.207 - 210, 2004/04
Times Cited Count：13 Percentile：71.74(Physics, Nuclear)Excited states in Ba, populated in deep-inelastic collisions by the interaction of 450-MeV Se ions with a 
La target, have been studied by means of in-beam -ray spectroscopy. A new isomer with 
has been identified at an excitation energy of 
MeV. The half-life was determined as 
ns. The extracted 
value is much smaller than those in 
Te and 
Xe. This hindrance is investigated by a shell model calculation.
ssbauer Isomer shifts and Structures of Neptunium compoundsSaeki, Masakatsu; Nakada, Masami; Kitazawa, Takafumi*
KURRI-KR-106, p.38 - 42, 2004/03
no abstracts in English
OsShizuma, Toshiyuki; Mitarai, Shiro*; Sletten, G.*; Bark, R. A.*; Gjorup, N. L.*; Jensen, H. J.*; Piiparinen, M.*; Wrzesinski, J.*; Shimizu, Yoshifumi*
Physical Review C, 69(2), p.024305_1 - 024305_18, 2004/02
Times Cited Count：15 Percentile：65.29(Physics, Nuclear)High-spin states in Os have been studied using the 
Yb(
C,4n) reaction at a beam energy of 65MeV. Previously known 1-quasiparticle bands have been extended to higher spins. New high- bands based on 3- and 5-quasiparticle excitation have been identified. Nilsson configurations are assigned based on the g-factors deduced from M1/E2 branching ratios within the bands. In addition, a new isomer at 5008keV has been found with a half-life of 18(2) ns. The hindrance in decays of the high- intrinsic states are discussed in terms of the tunneling model where the low- and high- states interact through the triaxial shape fluctuation.
-1,2-dichloroethylene decomposition in low-humidity air under electron beam irradiationSun, Y.*; Hakoda, Teruyuki; Chmielewski, A. G.*; Hashimoto, Shoji*
Radiation Physics and Chemistry, 68(5), p.843 - 850, 2003/12
Times Cited Count：8 Percentile：49.8(Chemistry, Physical)no abstracts in English
ReShizuma, Toshiyuki; Toh, Yosuke; Oshima, Masumi; Sugawara, Masahiko*; Matsuda, Makoto; Hayakawa, Takehito; Koizumi, Mitsuo; Osa, Akihiko; Zhang, Y. H.*; Liu, Z.*
European Physical Journal A, 17(2), p.159 - 165, 2003/06
Times Cited Count：10 Percentile：55.54(Physics, Nuclear)High-spin states in Re populated by inelastic scattering of a 500-MeV Se beam have been studied by means of in-beam -ray spectroscopy. Levels built on the 
[402] and 
[514] one-quasiparticle states were measured up to 
and 
, respectively. In additions, several new levels including an isomer at 1682 keV with a half-life of 114(23) ns have been found. Quasiparticle configurations of the levels and the transition rates are discussed.
Re isomeric stateHayakawa, Takehito; Shizuma, Toshiyuki; Yamauchi, Toshihiko; Minehara, Eisuke; Arisawa, Takashi
Nuclear Physics A, 718, p.665c - 667c, 2003/05
no abstracts in English
Eu Mssbauer spectroscopic study on the Eu
M
O
(0
y1.0)(M=Th, U)Masaki, Nobuyuki; Otobe, Haruyoshi; Nakamura, Akio; Harada, Daijitsu*; Ito, Kentaro*; Sasaki, Yoshinobu*; Hinatsu, Yukio*
Journal of Nuclear Science and Technology, 39(Suppl.3), p.217 - 220, 2002/11
no abstracts in English
isomeric decaysShizuma, Toshiyuki; Shimizu, Yoshifumi*; Hayakawa, Takehito
Journal of Nuclear Science and Technology, 39(11), p.1137 - 1141, 2002/11
Times Cited Count：4 Percentile：29.2(Nuclear Science & Technology)We have systematically investigated the highly -forbidden transitions observed in the Hf, W and Os region, using the -tunneling model in which low- and high- states interact through a process of the quantum tunneling. In the present study, we have analyzed -forbidden transitions recently observed. The measured hindrance factors are compared with the values calculated using the -tunneling model. We have also investigated isotope dependences of tunneling probabilities particularly for neutron-rich nuclei.
negative parity states in 
OsShizuma, Toshiyuki; Stevenson, P. D.*; Walker, P. M.*; Toh, Yosuke; Hayakawa, Takehito; Oshima, Masumi; Furuno, Kohei*; Komatsubara, Tetsuro*
Physical Review C, 65(6), p.064310_1 - 064310_12, 2002/06
Times Cited Count：15 Percentile：62.86(Physics, Nuclear)High-spin states in Os have been studied using the 
Er(
O,4n) reaction at a beam energy of 85 MeV. Several new negative parity levels including a 48-ns 
isomer have been identified. Nilsson configurations for the levels are assigned by comparison with multi-quasiparticle calculations. Potential-energy-surface calculations show an increasing influence of triaxiality in nuclear shapes at higher spins. The decay rate of the isomer is discussed in relation to the role of the quantum number.
-forbidden transitions in 
OsShizuma, Toshiyuki; Matsuura, Katsuyuki*; Toh, Yosuke; Hayakawa, Takehito; Oshima, Masumi; Hatsukawa, Yuichi; Matsuda, Makoto; Furuno, Kohei*; Sasaki, Yasuyuki*; Komatsubara, Tetsuro*; et al.
Nuclear Physics A, 696(3-4), p.337 - 370, 2001/12
Times Cited Count：20 Percentile：73.8(Physics, Nuclear)High-spin states in Os have been studied using the 170Er(18O,5n) reaction at a beam energy of 85 MeV. Nine rotational bands based on 1-, 3-, 5- and 7-quasiparticle excitations have been observed. Nilsson configurations are assigned for the newly observed bands using g-factors deduced from M1/E2 branching ratios within the bands. In addition, two isomers with K=(43/2+) and (43/2-) have been identified. The K=(43/2+) isomer decays directly to the K=9/2+ ground state band with a large difference in the quantum number, 
17. The decay rates are disccused in terms of a tunneling model where high- (isomeric) and low- states interact via fluctuations towards triaxial nuclear shapes.
Hendri, J.*; Hiroki, Akihiro*; Maekawa, Yasunari; Yoshida, Masaru; Katakai, Ryoichi*
Radiation Physics and Chemistry, 61(2), p.155 - 161, 2001/05
Times Cited Count：2 Percentile：19.6(Chemistry, Physical)no abstracts in English
laser irradiationYamauchi, Toshihiko; Kamei, Yasutaka*; Ito, Shinichi*; Furukawa, Yukio*; Minehara, Eisuke
Kankyo Kagakkai-Shi, 14(1), p.73 - 76, 2001/01
no abstracts in English
C=C
Hayakawa, Shigeo*; *; Arakawa, Kazuo; Morishita, Norio
Journal of Chemical Physics, 110(6-8), p.2745 - 2748, 1999/02
Times Cited Count：21 Percentile：55.26(Chemistry, Physical)no abstracts in English
Np Moessbauer spectra and coordination numbers of Np atoms in neptunyl(V) compoundsSaeki, Masakatsu; Nakada, Masami; Nakamoto, Tadahiro*; Yamashita, Toshiyuki; ; Krot, N. N.*
Journal of Radioanalytical and Nuclear Chemistry, 239(2), p.221 - 225, 1999/00
Times Cited Count：7 Percentile：49.64(Chemistry, Analytical)no abstracts in English
-ray emission source developmentArisawa, Takashi; Matoba, Toru; Yamakawa, Koichi; Maruyama, Yoichiro; Sasuga, Tsuneo; Wakaida, Ikuo; Nakajima, Kazuhisa*; Sasaki, Akira; Minehara, Eisuke; Oshima, Masumi
Proc. of the 1st International Induced Gamma Emision Workshop, p.29 - 41, 1999/00
no abstracts in English
