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Photoneutron cross section measurements on $$^{186}$$W, $$^{187}$$Re and $$^{188}$$Os for cosmochronology

Shizuma, Toshiyuki; Utsunomiya, Hiroaki*; Goko, Shinji*; Mohr, P.*; Hayakawa, Takehito; Makinaga, Ayano*; Hara, Kaoru*; Ogaki, Hideaki*; Lui, Y.-W.*; Goriely, S.*

Photodisintegration experiments were carried out for $$^{186}$$W, $$^{187}$$Re, and $$^{188}$$Os using quasi-monochromatic $$gamma$$-ray beams from laser Compton scattering (LCS) at the National Institute of Advanced Industrial Science and Technology. The excitation function of ($$gamma$$,n) cross sections was measured for the three nuclei near neutron thresholds, taking advantage of the intense peaking of the energy-tunable LCS beam in the energy region of astrophysical importance. Neutron capture cross sections for $$^{185}$$W, $$^{186}$$Re, and $$^{187}$$Os are evaluated from the photodisintegration data with the Hauser-Feshbach statistical model. We quantitatively discuss the two corrections factors for the s-process branchings and the neutron capture on the 9.75 keV state.

Language

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English

Journal

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Nuclear Physics A

Volume

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758

Number

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Pages

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p.561c - 564c

Publication Year/Month

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2005/07

Meeting title

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8th International Symposium on Nuclei in the Cosmos

Held date

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2004/07

Location (city)

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Vancouver

Location (country)

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Canada

Patent information

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PDF

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Paper URL

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DOI for research data

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Keywords

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光核反応; レーザー逆コンプトン$$gamma$$線; 捕獲反応断面積; 核統計模型

Research Facility

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Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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Accesses

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- Accesses

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