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SiKomatsubara, Tetsuro*; Kubono, Shigeru*; Hayakawa, Takehito; Shizuma, Toshiyuki; Osawa, Akira*; Ito, Yuta*; Ishibashi, Yoko*; Moriguchi, Tetsuro*; Yamaguchi, Hidetoshi*; Kahl, D.*; et al.
European Physical Journal A, 50, p.136_1 - 136_9, 2014/09
Times Cited Count：15 Percentile：66.39(Physics, Nuclear)The level scheme above the proton threshold in Si is crucial for evaluating the 
Al(p,
)Si stellar reaction, which is important for understanding the astrophysical origin of the long-lived cosmic radioactivity Al(T
=7.17
10
y) in the Galaxy. The excited states in Si have been studied using an in-beam -ray spectroscopy technique with the 
Mg(
He,n)Si reaction. The spin-parity of one of the most important states reported recently at 5890.0 keV has been assigned as 0
by - angular correlation measurements.
FeShizuma, Toshiyuki; Hayakawa, Takehito; Ogaki, Hideaki; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*; Kikuzawa, Nobuhiro; Inakura, Tsunenori*; Homma, Michio*; Nakada, Hitoshi*
Physical Review C, 87(2), p.024301_1 - 024301_7, 2013/02
Times Cited Count：18 Percentile：70.37(Physics, Nuclear)Electro-magnetic dipole transitions in Fe were measured in photon scattering experiments with a linearly polarized photon beam. The parity quantum numbers of the excited dipole states were determined by the intensity asymmetry of resonantly scattered -rays with respect to the polarization plane of the incident photon beam. While the summed magnetic dipole (
) strength was determined as 
at excitation energies between 7 and 10 MeV, the summed electric dipole (
) strength below 10 MeV was obtained as 
. The observed strength was compared with shell-model predictions in the 
-shell using the GXPF1J and KB3G effective interactions. In addition, the strength was compared with random-phase approximation calculations with the Skyrme interaction.
S states from 
Si(He, 
)SSetoodehnia, K.*; Chen, A. A.*; Komatsubara, Tetsuro*; Kubono, Shigeru*; Binh, D. N.*; Carpino, J. F.*; Chen, J.*; Hashimoto, Takashi*; Hayakawa, Takehito; Ishibashi, Yoko*; et al.
Physical Review C, 83(1), p.018803_1 - 018803_4, 2011/01
Times Cited Count：13 Percentile：60.90(Physics, Nuclear)The structure of proton-unbound S states strongly determines the thermonuclear 
P(
, )S reaction rate at temperatures characteristic of explosive hydrogen burning in classical novae and type I X-ray bursts. Specifically, the rate had been previously predicted to be dominated by two low-lying, unobserved, levels in the 
=4.7-4.8 MeV region, with spin and parity assignments of 3 and 2. In recent experimental work, two candidate levels were observed with energies of 4.699 MeV and 4.814 MeV, but no experimental information on their spins and parities was obtained. We have performed an in-beam -ray spectroscopy study of S with the Si(He, )S reaction. The spin and parities were inferred from a comparison to the known decay schemes of the corresponding mirror states.
PbShizuma, Toshiyuki; Hayakawa, Takehito; Ogaki, Hideaki*; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*; Kikuzawa, Nobuhiro; Tamii, Atsushi*; Nakada, Hitoshi*
AIP Conference Proceedings 1153, p.297 - 302, 2009/00
Spin-flip strength in Pb has been measured in photon scattering experiments with a quasi-monochromatic, linearly polarized photon beam. The data resolve an giant resonance into at least seven, possibly eight, discrete transitions at energies between 7.1 and 7.4 MeV below the neutron separation energy. The measured strength in this region is found to be larger than the previous report. By comparing the data with a self-consistent RPA estimation using a semi-realistic interaction, a role of the tensor force is reconfirmed.
PbShizuma, Toshiyuki; Hayakawa, Takehito; Ogaki, Hideaki*; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*; Kikuzawa, Nobuhiro; Tamii, Atsushi*; Nakada, Hitoshi*
Physical Review C, 78(6), p.061303_1 - 061303_4, 2008/12
Times Cited Count：81 Percentile：95.02(Physics, Nuclear)Spin-flip strength in Pb has been measured in photon scattering experiments with a quasi-monochromatic, linearly polarized photon beam. The data resolve an giant resonance into at least seven, possibly eight, discrete transitions at excitation energies between 7.1 and 7.4 MeV below the neutron separation energy. The measured strength in this region is found to be larger than the previous report. The experimental results are compared with an estimation of self-consistent random phase approximation using a semi-realistic interaction.
Hashimoto, Takashi; Ishiyama, Hironobu*; Ishikawa, Tomoko*; Kawamura, Takashi*; Nakai, Koji*; Watanabe, Yutaka*; Miyatake, Hiroari; Tanaka, Masahiko*; Fuchi, Yoshihide*; Yoshikawa, Nobuharu*; et al.
Nuclear Instruments and Methods in Physics Research A, 556(1), p.339 - 349, 2006/01
Times Cited Count：34 Percentile：88.31(Instruments & Instrumentation)A new type of three dimensional tracking and proportional gas counter has been developed. Adopting a gating-grid system, performance of the detector becomes stable under the injection rate of charged particles less than 410
pps. It is a useful detection system for astrophysical experiments using radioactive nuclear beams, since the efficiency is so high as 100 %.
TbZheng, Y.*; Zhou, X. H.*; Zhang, Y. H.*; Hayakawa, Takehito; Oshima, Masumi; Toh, Yosuke; Shizuma, Toshiyuki; Katakura, Junichi; Hatsukawa, Yuichi; Matsuda, Makoto; et al.
Journal of Physics G; Nuclear and Particle Physics, 30(4), p.465 - 479, 2004/04
Times Cited Count：8 Percentile：47.14(Physics, Nuclear)no abstracts in English
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：16 Percentile：63.46(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.
IrZhang, Y.*; Hayakawa, Takehito; Oshima, Masumi; Katakura, Junichi; Hatsukawa, Yuichi; Matsuda, Makoto; Kusakari, Hideshige*; Sugawara, Masahiko*; Komatsubara, Tetsuro*; Furuno, Kohei*
Physical Review C, 65(1), p.014302_1 - 014302_15, 2002/01
Times Cited Count：20 Percentile：69.12(Physics, Nuclear)no abstracts in English
-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：73.11(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.
IrZhang, Y. H.*; Hayakawa, Takehito; Oshima, Masumi; Toh, Yosuke; Katakura, Junichi; Hatsukawa, Yuichi; Matsuda, Makoto; Shinohara, Nobuo; Ishii, Tetsuro; Kusakari, Hideshige*; et al.
European Physical Journal A, 8(4), p.439 - 442, 2000/09
Times Cited Count：14 Percentile：59.86(Physics, Nuclear)no abstracts in English
IrZhang, Y.*; Hayakawa, Takehito; Oshima, Masumi; Katakura, Junichi; Hatsukawa, Yuichi; Matsuda, Makoto; Kusakari, Hideshige*; Sugawara, Masahiko*; Komatsubara, Tetsuro*
AIP Conference Proceedings 495, p.247 - 248, 1999/12
no abstracts in English
IrZhang, Y.*; Hayakawa, Takehito; Oshima, Masumi; Katakura, Junichi; Hatsukawa, Yuichi; Matsuda, Makoto; Kusakari, Hideshige*; Sugawara, Masahiko*; Komatsubara, Tetsuro*
European Physical Journal A, 5(4), p.345 - 349, 1999/00
Times Cited Count：17 Percentile：66.49(Physics, Nuclear)no abstracts in English
-ray detector array for joint spectroscopy experiments at the JAERI tandem-booster facilityOshima, 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：98.11(Instruments & Instrumentation)no abstracts in English
state in 
Ba; Furuno, Kohei*; ; Sugita, Michiaki; ; ; ; ; ; Komatsubara, Tetsuro*; et al.
European Physical Journal A, 2(1), p.13 - 15, 1998/00
Times Cited Count：11 Percentile：54.68(Physics, Nuclear)no abstracts in English
CsHayakawa, Takehito*; J.Lu*; Furuno, Kohei*; ; ; ; Komatsubara, Tetsuro*; Oshima, Masumi; ; ; et al.
Z. Phys., A, 357(4), p.349 - 350, 1997/00
no abstracts in English
Cu; Hayakawa, Takehito*; ; ; ; Ishii, Tetsuro; Oshima, Masumi; ; Kusakari, Hideshige*; Sugawara, Masahiko*; et al.
Z. Phys., A, 359, p.3 - 4, 1997/00
no abstracts in English
Zn; Hayakawa, Takehito*; ; ; ; Oshima, Masumi; ; Komatsubara, Tetsuro*; ; Furuno, Kohei*; et al.
Z. Phys., A, 358, p.279 - 280, 1997/00
no abstracts in English
Oshima, Masumi; Furuno, Kohei*; Komatsubara, Tetsuro*; Hayakawa, Takehito*; ; ; ; ; ; Ishii, Tetsuro
Chujukaku No Kozo (Riken Shimpojiumu), 0, p.72 - 77, 1996/00
no abstracts in English
Shizuma, Toshiyuki; Hayakawa, Takehito; Ogaki, Hideaki; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*
no journal, ,
Nuclear electromagnetic (EM) transitions can be studied by nuclear photon scattering, or nuclear resonance fluorescence (NRF). Recently, it was shown that a quasi-monochromatic, linearly polarized photon beam produced by inverse Compton scattering increased experimental sensitivities to distinguish between electric and magnetic dipole transitions. Here we report the results of the nuclear photon scattering measurements on Fe using a quasi-monochromatic, linearly polarized photon beam derived at National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba. Many dipole resonances below the neutron separation energy of Fe (11.2 MeV) have been observed. The multi-polarities of these transitions were determined by intensity asymmetry relative to the polarization of the incident photon beam. The experimental results are compared with a shell model calculation.
