Abstract
In this work, we present new data on the ) cross sections, utilizing a quasi-monochromatic photon beam produced at the NewSUBARU synchrotron radiation facility. Further, we have extracted the nuclear level density and -ray strength function of from data on the reaction measured at the Oslo Cyclotron Laboratory. Combining previous measurements on the ) cross section with our new ) and ( data sets, we have deduced the -ray strength function in the range of MeV and MeV. Our data are used to extract the level density and -ray strength functions needed as input to the nuclear-reaction code talys, providing an indirect, experimental constraint for the cross section and reaction rate. Compared to the recommended Maxwellian-averaged cross section (MACS) in the KADoNiS-1.0 database, our results are on average lower for the relevant energy range keV, and we provide a smaller uncertainty for the MACS. The theoretical values of Bao et al. [At. Data Nucl. Data Tables 76, 70 (2000)] and the cross section experimentally constrained on photoneutron data of Sonnabend et al. [Astrophys. J. 583, 506 (2003)] are significantly higher than our result. The lower value by Mohr et al. [Phys. Rev. C 69, 032801(R) (2004)] is in very good agreement with our deduced MACS. Our new results provide an improved uncertainty estimate for the ( reaction rate, which is one important ingredient in simulations for investigating the neutron density and the production in the process.
8 More- Received 31 January 2023
- Accepted 28 June 2023
DOI:https://doi.org/10.1103/PhysRevC.108.025804
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