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Journal Articles

Photodisintegration cross section measurements on $$^{186}$$W, $$^{187}$$Re and $$^{188}$$Os; Implications for the Re-Os cosmochronology

Shizuma, Toshiyuki; Utsunomiya, Hiroaki*; Mohr, P.*; Hayakawa, Takehito; Goko, Shinji*; Makinaga, Ayano*; Akimune, Hidetoshi*; Yamagata, Tamio*; Ota, Masahisa*; Ogaki, Hideaki*; et al.

Physical Review C, 72(2), p.025808_1 - 025808_9, 2005/08

https://doi.org/10.1103/PhysRevC.72.025808
 Times Cited Count：43 Percentile：90.03(Physics, Nuclear)

Cross sections of the $$^{186}$$W, $$^{187}$$Re, $$^{188}$$Os($$gamma,n$$) reactions were measured using quasi-monochromatic photon beams from laser Compton scattering (LCS) with average energies from 7.3 to 10.9 MeV. The results are compared with the predictions of Hauser-Feshbach statistical calculations using four different sets of input parameters. In addition, the inverse neutron capture cross sections were evaluated by constraining the model parameters, especially the $$E1$$ strength function, on the basis of the experimental data. The present experiment helps to further constrain the correction factor $$F_{sigma}$$ for the neutron capture on the 9.75 keV state in $$^{187}$$Os. Implications of $$F_{sigma}$$ to the Re-Os cosmochronology are discussed with a focus on the uncertainty in the estimate of the age of the Galaxy.

Journal Articles

New $$s$$-process path and its implications for a $$^{187}$$Re-$$^{187}$$Os nucleo-cosmochronometer

Hayakawa, Takehito; Shizuma, Toshiyuki; Kajino, Toshitaka*; Chiba, Satoshi; Shinohara, Nobuo; Nakagawa, Tsuneo; Arima, Taiko*

Astrophysical Journal, 628(1, Part1), p.533 - 540, 2005/07

https://doi.org/10.1086/430198
 Times Cited Count：22 Percentile：51.52(Astronomy & Astrophysics)

no abstracts in English

Journal Articles

Evidence for nucleosynthesis in the supernova $$gamma$$ process; Universal scaling for $$p$$-nuclei

Hayakawa, Takehito; Iwamoto, Nobuyuki; Shizuma, Toshiyuki; Kajino, Toshitaka*; Umeda, Hideyuki*; Nomoto, Kenichi*

Physical Review Letters, 93(16), p.161102_1 - 161102_4, 2004/10

https://doi.org/10.1103/PhysRevLett.93.161102
 Times Cited Count：60 Percentile：86.56(Physics, Multidisciplinary)

no abstracts in English

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