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Cross section measurements of the [Formula Presented] reaction near neutron threshold and the p-process nucleosynthesis

par Utsunomiya, Hiroaki;Lui, Yiu-Wing;Hayakawa, Takehito;Shizuma, Toshiyuki;Khan, Elias;Goriely, Stéphane ;Akimune, Hidetoshi;Goko, Shinji;Ohta, Masahisa;Ueda, Hiroshi;Yamagata, Tamio;Yamasaki, Katsuyoshi;Ohgaki, Hideaki;Toyokawa, Huoyuki
Référence Physical review. C. Nuclear physics, 67, 1, page (9)
Publication Publié, 2003

Article révisé par les pairs

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Résumé :

New measurements of the photoneutron reaction on [Formula Presented] have been conducted with the AIST-LCS (laser Compton scattering) beam in the [Formula Presented] energy range. The major advantage of the present [Formula Presented]-ray experiment is its intense peaking in the energy window of astrophysical interest, i.e., close to the neutron threshold. Details on photon beams from the laser Compton scattering, neutron counting, and experimental determination of the [Formula Presented] photoneutron cross section are given. The present experimental data are in good agreement with the IAEA evaluation. Reaction rate calculations in the Hauser-Feshbach statistical model are performed and confronted with the experimental data. The data provide constraints on the low-energy tail of the dipole strength function. It is found that among the three different models for the [Formula Presented]-strength considered, only the microscopic quasiparticle random phase approximation model can reproduce the extra strength observed in the [Formula Presented] reaction at energies of about 8.5 MeV. Such an experiment helps to improve the determination of the corresponding stellar photodisintegration rate of [Formula Presented] which directly influences the p-process production of [Formula Presented]. © 2003 The American Physical Society.