Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Shizuma, 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:16 Percentile:68.29(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.
Setoodehnia, 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:12 Percentile:60.75(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.
Shizuma, 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:77 Percentile:95.33(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.
Zheng, 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:48.06(Physics, Nuclear)no abstracts in English
Zhang, 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
Zhang, 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:67.43(Physics, Nuclear)no abstracts in English
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:98.39(Instruments & Instrumentation)no abstracts in English
*; Furuno, Kohei*; *; Sugita, Michiaki; *; *; *; *; *; Komatsubara, Tetsuro*; et al.
European Physical Journal A, 2(1), p.13 - 15, 1998/00
Times Cited Count:10 Percentile:52.77(Physics, Nuclear)no abstracts in English
Hayakawa, 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
*; Hayakawa, Takehito*; *; ; *; Oshima, Masumi; *; Komatsubara, Tetsuro*; ; Furuno, Kohei*; et al.
Z. Phys., A, 358, p.279 - 280, 1997/00
no abstracts in English
; 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
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; Kikuzawa, Nobuhiro; Ogaki, Hideaki*; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*
no journal, ,
no abstracts in English
Shizuma, Toshiyuki; Hayakawa, Takehito; Ogaki, Hideaki; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*; Kikuzawa, Nobuhiro; Tamii, Atsushi*; Nakada, Hitoshi*
no journal, ,
The knowledge of the M1 response allows one to elucidate the details of nuclear dynamics. It is also important for the estimate neutral current neutrino-nucleus cross sections for supernova explosion. Low-lying electromagnetic transitions can be studied by the method of nuclear resonance fluorescence (NRF). Recently, it has been shown that quasi-monochromatic, linearly polarized photon beams from inverse laser Compton scattering has considerably increased experimental sensitivity and to enable one to detect the fine structure of relatively weak M1 transitions. In this report, results of the NRF measurements on Pb using a linearly polarized photon beam will be presented. The M1 resonance below the neutron separation energy is resolved into several individual transitions. The experimental results are compared with an estimation of self-consistent random phase approximation using a semi-realistic interaction.
Shizuma, Toshiyuki; Hayakawa, Takehito; Kikuzawa, Nobuhiro; Ogaki, Hideaki; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*
no journal, ,
no abstracts in English