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Journal Articles

Superdeformed band in asymmetric N $$>$$ Z nucleus, $$^{40}$$Ar and high-spin states in A = 30 $$sim$$ 40 nuclei

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

Journal Articles

Possible antimagnetic rotation band and neutron alignment in $$^{101}$$Pd

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:14 Percentile:32.51(Physics, Nuclear)

High spin states of $$^{101}$$Pd have been studied through in-beam $$gamma$$-ray spectroscopy by using the reaction $$^{68}$$Zn ($$^{37}$$Cl, 1$$p$$3$$n$$). The band based on the $$h$$$$_{11/2}$$ neutron orbital has been extended to higher-spin states, and the band based on the $$d$$$$_{5/2}$$ 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 $$h$$$$_{11/2}$$ band to the $$d$$$$_{5/2}$$ band have been also observed. The structure of the $$h$$$$_{11/2}$$ band was discussed from the viewpoint of "antimagnetic rotation" based on a semiclassical particle plus rotor model taking neutron alignments into account.

Journal Articles

Coulomb excitation of $$^{156}$$Gd

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:53.76(Physics, Nuclear)

Multiple Coulomb-excitation experiments for $$^{156}$$Gd were made with a 118 MeV $$^{32}$$S beam and a 225 MeV $$^{58}$$Ni beam. The ground-state band, the $$beta$$ band ($$K$$=0$$^{+}$$), and the $$gamma$$ band ($$K$$=2$$^{+}$$) were observed up to the 18$$^+$$, 14$$^+$$, and 12$$^+$$ states, respectively, while the octupole band ($$K$$=1$$^{-}$$) was observed up to the 15$$^-$$ state, through the analysis of particle-$$gamma$$-$$gamma$$ data. The intrinsic matrix elements entering the generalized intensity relations were obtained so as to reproduce the spin dependence of the $$E$$2 matrix elements extracted from the experimental results of particle-$$gamma$$ 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 $$beta$$ and $$gamma$$ bands is discussed as a possible cause for the variation of the $$E$$2 matrix elements in the higher-spin region.

Journal Articles

Shape evolution in heaviest stable even-even molybdenum isotopes studied via coulomb excitation

Wrzosek-Lipska, K.*; Zieli$'n$ska, M.*; Hady$'n$ska-Klek, K.*; Hatsukawa, Yuichi; Iwanicki, J.*; Katakura, Junichi; Kisieli$'n$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:3 Percentile:70.01(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 $$^{96,98,100}$$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 $$^{100}$$Mo.

Journal Articles

Superdeformation in asymmetric $$N$$$$>$$$$Z$$ nucleus $$^{40}$$Ar

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:28 Percentile:15.21(Astronomy & Astrophysics)

A rotational band with five $$gamma$$-ray transitions ranging from 2$$^+$$ to 12$$^+$$ states was identified in $$^{40}$$Ar. The deduced transition quadrupole moment of 1.45 $$pm$$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.

Journal Articles

One-quasiparticle bands in neutron-rich $$^{187}$$W

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:7 Percentile:50.14(Physics, Nuclear)

Modest spin states in neutron-rich $$^{187}$$W have been populated using a $$^{186}$$W($$^{18}$$O,$$^{17}$$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 $$nu$$ i$$_{13/2}$$ 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.

Journal Articles

Evidence for a $$K^pi=1/2^+$$ isomer in neutron-rich $$^{185}$$Ta

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:5 Percentile:56.77(Physics, Nuclear)

Excited states in neutron-rich $$^{185}$$Ta have been populated following the one-proton pickup reaction of $$^{186}$$W($$^{18}$$O,$$^{19}$$F). In-beam $$gamma$$ rays were measured in coincidence with scattered particles detected by a high-resolution $$Delta E$$-$$E$$ Si telescope for reaction channel selection. Several low-lying levels including a $$T_{1/2}=0.9(3)$$ $$mu$$s isomer at 406 keV have been identified. A spin assignment of $$I=3/2$$ 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.

Journal Articles

Excited states in neutron-rich $$^{188}$$W produced by an $$^{18}$$O-induced 2-neutron transfer reaction

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:35.89(Physics, Nuclear)

Excited states in neutron-rich $$^{188}$$W have been populated using a $$^{186}$$W($$^{18}$$O,$$^{16}$$O) reaction. In-beam $$gamma$$ rays were measured in coincidence with scattered particles detected by a high-resolution $$Delta E$$-$$E$$ Si telescope. In this experiment, the ground state band has been identified up to $$I^pi=8^+$$. The $$gamma$$ band, the $$K^pi=2^-$$ 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.

Journal Articles

Search for signature inversion in the $$pi i_{13/2} bigotimes nu i_{13/2}$$ bands in $$^{182,184,186}$$Au

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:69.97(Physics, Nuclear)

Search for low-spin signature inversion in the $$pi i_{13/2} bigotimes nu i_{13/2}$$ bands in odd-odd $$^{182,184,186}$$Au have been made through in-beam $$gamma$$-ray spectroscopy techniques. The $$pi i_{13/2} bigotimes nu i_{13/2}$$ bands in the three nuclei have been identified and extended up to high-spin states. In particlular, the interband connection between the $$pi i_{13/2} bigotimes nu i_{13/2}$$ band and the ground-state band in $$^{184}$$Au have been established, leading to a firm spin-and-parity assignment for the $$pi i_{13/2} bigotimes nu i_{13/2}$$ band. The low-spin signature inversion is found in the $$pi i_{13/2} bigotimes nu i_{13/2}$$ bands in $$^{182,184,186}$$Au.

Journal Articles

Coulomb excitation experiments at JAEA Tandem facility for the study of nuclear structure

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

Journal Articles

Identification of the $$K^pi=11/2^+$$ isomer in neutron-rich $$^{187}$$W

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:5 Percentile:57(Physics, Nuclear)

Excited states in neutron-rich $$^{187}$$W have been populated via deep inelastic collisions of a 630-MeV $$^{82}$$Se beam on a $$^{186}$$W target. Projectile-like fragments were measured by an annular Si detector for reaction channel selection. Delayed $$gamma$$ rays from target residues were detected by means of the so-called recoil shadow technique. A new isomer at 411 keV, based on the $$11/2^+$$[615] Nilsson configuration, has been identified with the half-life of 1.56(28) $$mu$$s. The decay rates of the isomers are discussed in terms of the $$K$$ quantum number by comparison with the systematics from the neighboring nuclei.

Journal Articles

Shape coexistence in even-even mo isotopes studied via coulomb excitation

Zieli$'n$ska, M.*; Czosnyka, T.*; Wrzosek-Lipska, K.*; Choi$'n$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 $$^{96}$$Mo and $$^{100}$$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 $$^{98}$$Mo isotope.

Journal Articles

Multiple coulomb excitation experiment of $$^{68}$$Zn

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:13 Percentile:36.35(Physics, Nuclear)

Coulomb excitation experiment was carried out with a $$^{68}$$Zn beam bombarding a $$^{nat}$$Pb target. Two $$E2$$ matrix elements and the quadrupole moment of the 2$$_{1}$$$$^{+}$$ 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 $$1g_{9/2}$$ 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.

Journal Articles

Multiple Coulomb Excitation Experiment of $$^{66}$$Zn

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:13 Percentile:34.95(Physics, Nuclear)

no abstracts in English

Journal Articles

Projectile Coulomb excitation of $$^{78}$$Se

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:12 Percentile:37.2(Physics, Nuclear)

no abstracts in English

Journal Articles

First measurement of the quadrupole moment in the 2$$_1^+$$ state of $$^{84}$$Kr

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:9 Percentile:50.31(Astronomy & Astrophysics)

A $$^{84}$$Kr beam was Coulomb-excited on a $$^{98}$$Mo target and a $$^{nat}$$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$$_1^+$$ was newly obtained. The measured quadrupole moment and the $$B(E2)$$ values are consistent with large-scale shell-model calculations which give a systematic description of $$N$$,=,50 isotones.

Oral presentation

Spectroscopy for neutron-rich nuclei around A=180 produced by multi-nucleon transfer reactions

Shizuma, Toshiyuki; Ishii, Tetsuro; Hayakawa, Takehito; Makii, Hiroyuki; Matsuda, Makoto; Ideguchi, Eiji*; Zheng, Y.*; Liu, M.*; Morikawa, Tsuneyasu*; Mitarai, Shiro*

no journal, , 

no abstracts in English

Oral presentation

Nuclear structure study with Coulomb excitation experiments

Koizumi, Mitsuo; Toh, Yosuke; Oshima, Masumi; Osa, Akihiko; Kimura, Atsushi; Hatsukawa, Yuichi; Sugawara, Masahiko*; Morikawa, Tsuneyasu*; Kusakari, Hideshige*; Czosnyka, T.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Nuclear structure study of nuclei in the A=180 region using nucleon transfer reactions

Shizuma, Toshiyuki; Ishii, Tetsuro; Makii, Hiroyuki; Matsuda, Makoto; Hayakawa, Takehito; Ideguchi, Eiji*; Liu, M.*; Zheng, Y.*; Morikawa, Tsuneyasu*; Mitarai, Shiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

$$gamma$$-ray spectroscopy of the neutron-rich $$^{187}$$W and $$^{188}$$W produced using transfer reactions

Shizuma, Toshiyuki; Hayakawa, Takehito; Ishii, Tetsuro; Makii, Hiroyuki; Matsuda, Makoto; Shigematsu, Soichiro*; Ideguchi, Eiji*; Zheng, Y.*; Liu, M.*; Morikawa, Tsuneyasu*; et al.

no journal, , 

no abstracts in English

25 (Records 1-20 displayed on this page)