Speaker
Description
he Nuclear Level Density (NLD) and Gamma-ray strength function (GSF) are important quantities to study as they are inputs into the Hauser-Fesbach statistical model calculations which are used to predict reaction cross-sections. Once experimentally measured they can be used as inputs in codes such as TALYS [1] to calculate/constrain the $(n,\gamma)$ cross-sections. Thus, it is important to experimentally measure the NLD and GSF for as many nuclei as possible as it can help us validate theoretical models which predict reaction rate cross-sections.
An experiment was performed at the Oslo Cyclotron Laboratory using the CATCUS detector array and the $^{90}Zr(p,p'\gamma)^{90}Zr$ reaction was studied. The NLD and GSF for this reaction, below the neutron separation energy, were extracted using the Oslo method . Preliminary results from this analysis are presented here. As $^{90}Zr $ does not have any neutron resonance spacing data available one can use systematics to estimate the neutron resonance spacing or use the shape method [2] to obtain the slope of the GSF and thus the NLD when using the Oslo method. In this work the GSF and thus the NLD have been constrained by the Shape method.
Furthermore, the NLD and GSF from this work have been used to calculate the $^{89}Zr(n,\gamma)^{90}Zr$ and $^{89}Y(p,\gamma)^{90}Zr$ cross-section using TALYS [1].
References
1. A.J. Koning and D. Rochman. “Modern Nuclear Data Evaluation with
the TALYS Code System”. In: Nuclear Data Sheets 113.12 (2012). Spe-
cial Issue on Nuclear Reaction Data, pp. 2841–2934. issn: 0090-3752. doi:
https://doi.org/10.1016/j.nds.2012.11.002. url: https://www.
sciencedirect.com/science/article/pii/S0090375212009.\\relax
2. M. Wiedeking et al. “Independent normalization for γ-ray strength func-
tions: The shape method”. In: Phys. Rev. C 104 (1 2021), p. 014311. doi:
10.1103/PhysRevC.104.014311. url: https://link.aps.org/doi/10.
1103/PhysRevC.104.014311