Analysis of the energy and angular distributions of photoneutrons from natPb, 197Au, natSn, natCu, natFe, and natTi using resonance direct theory
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
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2026
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| author | Takeshita, Hayato Kosako, Kazuaki Kinoshita, Norikazu Watanabe, Yukinobu |
| author_facet | Takeshita, Hayato Kosako, Kazuaki Kinoshita, Norikazu Watanabe, Yukinobu |
| contents | Photoneutron double-differential cross sections in the giant dipole resonance (GDR) region were calculated to investigate the underlying nuclear reaction mechanisms, with particular emphasis on the role of the direct process. Contributions from direct, pre-equilibrium, and compound processes were all taken into account. Wilkinson's resonance direct (RD) theory, based on the independent particle model, was applied to describe high-energy neutron emission from the direct process. The angular distribution of neutrons emitted via the RD mechanism was formulated using the Agodi and Courant formalism, which was incorporated into the RD framework. Neutron emission from the pre-equilibrium and compound processes was calculated using the two-component exciton model and the Hauser-Feshbach formalism, respectively. The calculated results were compared with experimental data obtained at NewSUBARU using 16.6-MeV quasi-monochromatic linearly-polarized photon beams. Good agreement between calculations and measurements was observed for Pb, Au, and Sn, confirming the validity of the proposed model. Furthermore, the angular anisotropies of photoneutrons emitted from these elements were investigated, revealing considerable contributions from the RD process at high neutron energies. This study provides a deeper understanding of photoneutron emission mechanisms in the GDR energy region. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_07070 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Analysis of the energy and angular distributions of photoneutrons from natPb, 197Au, natSn, natCu, natFe, and natTi using resonance direct theory Takeshita, Hayato Kosako, Kazuaki Kinoshita, Norikazu Watanabe, Yukinobu Nuclear Theory Photoneutron double-differential cross sections in the giant dipole resonance (GDR) region were calculated to investigate the underlying nuclear reaction mechanisms, with particular emphasis on the role of the direct process. Contributions from direct, pre-equilibrium, and compound processes were all taken into account. Wilkinson's resonance direct (RD) theory, based on the independent particle model, was applied to describe high-energy neutron emission from the direct process. The angular distribution of neutrons emitted via the RD mechanism was formulated using the Agodi and Courant formalism, which was incorporated into the RD framework. Neutron emission from the pre-equilibrium and compound processes was calculated using the two-component exciton model and the Hauser-Feshbach formalism, respectively. The calculated results were compared with experimental data obtained at NewSUBARU using 16.6-MeV quasi-monochromatic linearly-polarized photon beams. Good agreement between calculations and measurements was observed for Pb, Au, and Sn, confirming the validity of the proposed model. Furthermore, the angular anisotropies of photoneutrons emitted from these elements were investigated, revealing considerable contributions from the RD process at high neutron energies. This study provides a deeper understanding of photoneutron emission mechanisms in the GDR energy region. |
| title | Analysis of the energy and angular distributions of photoneutrons from natPb, 197Au, natSn, natCu, natFe, and natTi using resonance direct theory |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2605.07070 |