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Ideguchi, Eiji*; Ota, Shinsuke*; Morikawa, Tsuneyasu*; Oshima, Masumi; Koizumi, Mitsuo; Toh, Yosuke; Kimura, Atsushi; Harada, Hideo; Furutaka, Kazuyoshi; Nakamura, Shoji; et al.
Progress of Theoretical Physics Supplement, (196), p.427 - 432, 2012/10
Sugawara, Masahiko*; Hayakawa, Takehito; Oshima, Masumi*; Toh, Yosuke; Osa, Akihiko; Matsuda, Makoto; Shizuma, Toshiyuki; Hatsukawa, Yuichi; Kusakari, Hideshige*; Morikawa, Tsuneyasu*; et al.
Physical Review C, 86(3), p.034326_1 - 034326_11, 2012/09
Times Cited Count:16 Percentile:66.48(Physics, Nuclear)High spin states of Pd have been studied through in-beam
-ray spectroscopy by using the reaction
Zn (
Cl, 1
3
). The band based on the
neutron orbital has been extended to higher-spin states, and the band based on the
neutron orbital has been somewhat revised. Many transitions decaying to these bands have been observed and consequently, several side bands have been established. Electric dipole transitions from the
band to the
band have been also observed. The structure of the
band was discussed from the viewpoint of "antimagnetic rotation" based on a semiclassical particle plus rotor model taking neutron alignments into account.
Sugawara, Masahiko*; Kusakari, Hideshige*; Yoshizawa, Hirokazu*; Inoue, Hikaru*; Morikawa, Tsuneyasu*; Shizuma, Toshiyuki; Srebrny, J.*
Physical Review C, 83(6), p.064308_1 - 064308_13, 2011/06
Times Cited Count:6 Percentile:43.02(Physics, Nuclear)Multiple Coulomb-excitation experiments for Gd were made with a 118 MeV
S beam and a 225 MeV
Ni beam. The ground-state band, the
band (
=0
), and the
band (
=2
) were observed up to the 18
, 14
, and 12
states, respectively, while the octupole band (
=1
) was observed up to the 15
state, through the analysis of particle-
-
data. The intrinsic matrix elements entering the generalized intensity relations were obtained so as to reproduce the spin dependence of the
2 matrix elements extracted from the experimental results of particle-
angular correlation for the transitions within each band and between each band and the ground-state band by the least-squares search code gosia. The change of characters in the
and
bands is discussed as a possible cause for the variation of the
2 matrix elements in the higher-spin region.
Wrzosek-Lipska, K.*; Zieliska, M.*; Hady
ska-Kl
k, K.*; Hatsukawa, Yuichi; Iwanicki, J.*; Katakura, Junichi; Kisieli
ski, M.*; Koizumi, Mitsuo; Kowalczyk, M.*; Kusakari, Hideshige*; et al.
International Journal of Modern Physics E, 20(2), p.443 - 450, 2011/02
Times Cited Count:5 Percentile:38.54(Physics, Nuclear)The quadrupole shape evolution in heaviest stable Mo isotopes is studied in terms of the shape coexistence phenomenon occurrence in this region of nuclear chart. Quadrupole deformation parameters of the Mo isotopes in the low-lying (ground and excited) 0
states were deduced using Coulomb excitation method. In all cases rich sets of electromagnetic reduced matrix elements were determined using the GOSIA code and then analyzed using the Quadrupole Sum Rules formalism. Discussion of the experimental results in comparison with the predictions of microscopic calculations within the general quadrupole collective Bohr Hamiltonian model is presented for
Mo.
Ideguchi, Eiji*; Ota, Shinsuke*; Morikawa, Tsuneyasu*; Oshima, Masumi; Koizumi, Mitsuo; Toh, Yosuke; Kimura, Atsushi; Harada, Hideo; Furutaka, Kazuyoshi; Nakamura, Shoji; et al.
Physics Letters B, 686(1), p.18 - 22, 2010/03
Times Cited Count:32 Percentile:85.69(Astronomy & Astrophysics)A rotational band with five -ray transitions ranging from 2
to 12
states was identified in
Ar. The deduced transition quadrupole moment of 1.45
0.15 eb indicates that the band has a superdeformed shape. The nature of the band is revealed by cranked Hartee Fock Bogoliubov calculations and a multiparticle-multihole configuration is assigned to the band.
Shizuma, Toshiyuki; Ishii, Tetsuro; Makii, Hiroyuki*; Hayakawa, Takehito; Matsuda, Makoto; Shigematsu, Soichiro*; Ideguchi, Eiji*; Zheng, Y.*; Liu, M.*; Morikawa, Tsuneyasu*; et al.
Physical Review C, 77(4), p.047303_1 - 047303_4, 2008/04
Times Cited Count:10 Percentile:56.9(Physics, Nuclear)Modest spin states in neutron-rich W have been populated using a
W(
O,
O) one-neutron transfer reaction. While negative-parity bands previously known are extended to higher spin, two positive-parity bands are newly identified. Configurations based on
i
orbitals are assigned to these bands from an analysis of the level energy systematics as well as the g-factors derived from in-band branching ratios.
Shizuma, Toshiyuki; Ishii, Tetsuro; Makii, Hiroyuki; Hayakawa, Takehito; Shigematsu, Soichiro*; Matsuda, Makoto; Ideguchi, Eiji*; Zheng, Y.*; Liu, M.*; Morikawa, Tsuneyasu*
European Physical Journal A, 34(1), p.1 - 4, 2007/10
Times Cited Count:7 Percentile:50.57(Physics, Nuclear)Excited states in neutron-rich Ta have been populated following the one-proton pickup reaction of
W(
O,
F). In-beam
rays were measured in coincidence with scattered particles detected by a high-resolution
-
Si telescope for reaction channel selection. Several low-lying levels including a
s isomer at 406 keV have been identified. A spin assignment of
and the 1/2
[411] Nilsson configuration are given to the isomer in comparison with the level energy systematics and the isomer decay rates in the region.
Shizuma, Toshiyuki; Ishii, Tetsuro; Makii, Hiroyuki; Hayakawa, Takehito; Shigematsu, Soichiro; Matsuda, Makoto; Ideguchi, Eiji*; Zheng, Y.*; Liu, M.*; Morikawa, Tsuneyasu*; et al.
European Physical Journal A, 30(2), p.391 - 396, 2006/11
Times Cited Count:12 Percentile:62(Physics, Nuclear)Excited states in neutron-rich W have been populated using a
W(
O,
O) reaction. In-beam
rays were measured in coincidence with scattered particles detected by a high-resolution
-
Si telescope. In this experiment, the ground state band has been identified up to
. The
band, the
octupole band, and a 2-quasiparticle state were also observed. The results are compared with predictions of self-consistent HFB cranking calculations and blocked-BCS multi-quasiparticle calculations.
Zhang, Y. H.*; Zhou, X. H.*; He, J. J.*; Liu, Z.*; Fang, Y. D.*; Guo, W. T.*; Lei, X. G.*; Guo, Y. X.*; Ndontchueng, M. M.*; Ma, L.*; et al.
International Journal of Modern Physics E, 15(7), p.1437 - 1445, 2006/10
Times Cited Count:3 Percentile:28.66(Physics, Nuclear)Search for low-spin signature inversion in the bands in odd-odd
Au have been made through in-beam
-ray spectroscopy techniques. The
bands in the three nuclei have been identified and extended up to high-spin states. In particlular, the interband connection between the
band and the ground-state band in
Au have been established, leading to a firm spin-and-parity assignment for the
band. The low-spin signature inversion is found in the
bands in
Au.
Koizumi, Mitsuo; Toh, Yosuke; Osa, Akihiko; Kimura, Atsushi; Utsuno, Yutaka; Oshima, Masumi; Hayakawa, Takehito; Hatsukawa, Yuichi; Katakura, Junichi; Matsuda, Makoto; et al.
Proceedings of the International Workshop on Quark Nuclear Physics 2006, p.245 - 252, 2006/00
no abstracts in English
Shizuma, 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:46.03(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.
Zieliska, M.*; Czosnyka, T.*; Wrzosek-Lipska, K.*; Choi
ski, J.*; Hatsukawa, Yuichi; Iwanicki, J.*; Koizumi, Mitsuo; Kusakari, Hideshige*; Matsuda, Makoto; Morikawa, Tsuneyasu*; et al.
Acta Physica Polonica B, 36(4), p.1289 - 1292, 2005/04
The nuclei Mo and
Mo have been Coulomb excited using various combinations of beams and targets. The investigation of the eletromagnetic structure of these isotopes provides an experimental background for a theoretical description of the shape coexistence observed in the previously studied
Mo isotope.
Koizumi, Mitsuo; Seki, Akiyuki*; Toh, Yosuke; Osa, Akihiko; Utsuno, Yutaka; Kimura, Atsushi; Oshima, Masumi; Hayakawa, Takehito; Hatsukawa, Yuichi; Katakura, Junichi; et al.
Nuclear Physics A, 730(1-2), p.46 - 58, 2004/01
Times Cited Count:16 Percentile:67.6(Physics, Nuclear)Coulomb excitation experiment was carried out with a Zn beam bombarding a
Pb target. Two
matrix elements and the quadrupole moment of the 2
state were newly derived with the least-squares search code GOSIA. The potential energy surface (PES) was calculated with the Nilsson-Strutinsky model, showing two shallow minima: the first minimum does not contain the
orbit below the Fermi surface, while the second minimum does. The ground state band and the intruder band seem to be constructed on the first and the second minimum, respectively. As for the ground state band, the asymmetric rotor model and the IBM in O(6) limit reproduced the experimental values rather well. The shallow PES may suggest unstability of the shape. The ground state band structure may be explained assuming a soft triaxial deformation.
Koizumi, Mitsuo; Seki, Akiyuki*; Toh, Yosuke; Oshima, Masumi; Osa, Akihiko; Kimura, Atsushi; Hatsukawa, Yuichi; Shizuma, Toshiyuki; Hayakawa, Takehito; Matsuda, Makoto; et al.
European Physical Journal A, 18(1), p.87 - 92, 2003/10
Times Cited Count:14 Percentile:65.35(Physics, Nuclear)no abstracts in English
Hayakawa, Takehito; Toh, Yosuke; Oshima, Masumi; Osa, Akihiko; Koizumi, Mitsuo; Hatsukawa, Yuichi; Utsuno, Yutaka; Katakura, Junichi; Matsuda, Makoto; Morikawa, Tsuneyasu*; et al.
Physical Review C, 67(6), p.064310_1 - 064310_6, 2003/06
Times Cited Count:17 Percentile:70.46(Physics, Nuclear)no abstracts in English
Osa, Akihiko; Czosnyka, T.*; Utsuno, Yutaka; Mizusaki, Takahiro*; Toh, Yosuke; Oshima, Masumi; Koizumi, Mitsuo; Hatsukawa, Yuichi; Katakura, Junichi; Hayakawa, Takehito; et al.
Physics Letters B, 546(1-2), p.48 - 54, 2002/10
Times Cited Count:10 Percentile:51.5(Astronomy & Astrophysics)A Kr beam was Coulomb-excited on a
Mo target and a
Ta target. Six reduced matrix elements for 5 low-lying states were derived from the analysis using the least-squares code GOSIA. The quadrupole moment of the 2
was newly obtained. The measured quadrupole moment and the
values are consistent with large-scale shell-model calculations which give a systematic description of
,=,50 isotones.
Oshima, Masumi; Furuno, Kohei*; Komatsubara, Tetsuro*; *; Hayakawa, Takehito*; *; ; ; *; *; et al.
Nuclear Instruments and Methods in Physics Research A, 421(1-2), p.211 - 226, 1999/00
Times Cited Count:95 Percentile:98.5(Instruments & Instrumentation)no abstracts in English
Oshima, Masumi; Morikawa, Tsuneyasu*; ; ; Shinohara, Nobuo; *; Kusakari, Hideshige*; *; Sugawara, Masahiko*; *
Physical Review C, 52(6), p.3492 - 3495, 1995/12
Times Cited Count:29 Percentile:81.59(Physics, Nuclear)no abstracts in English
Oshima, Masumi; Morikawa, Tsuneyasu*; ; Ishii, Tetsuro; *; Ikezoe, Hiroshi
JAERI-Conf 95-004, 103 Pages, 1995/03
no abstracts in English
Morikawa, Tsuneyasu*; *; Morita, Kosuke*; *; Murakami, Takeshi*; *; *; G.H.Liu*; A.Ferragut*; *; et al.
Physics Letters B, 350, p.169 - 172, 1995/00
Times Cited Count:19 Percentile:71.38(Astronomy & Astrophysics)no abstracts in English