r Process (n, γ) Rate Constraints from the γ Emission of Neutron Unbound States in β decay
Tain, J. L., Guadilla, V., Valencia, E., Algora, A., Zakari-Issoufou, A.-A., Rice, S., . . . Wilson, J. N. (2017). r Process (n, γ) Rate Constraints from the γ Emission of Neutron Unbound States in β decay. In NIC 2016 : Proceedings of the 14th International Symposium on Nuclei in the Cosmos (pp. 010607). JPS Conference Proceedings, 14. Physical Society of Japan. doi:10.7566/JPSCP.14.010607
Published inJPS Conference Proceedings;14
Rice, S. |
© the Authors, 2017. This is an open access article distributed under the terms of the Creative Commons License.
Total absorption gamma-ray spectroscopy is used to measure accurately the intensity of γγ emission from neutron-unbound states populated in the ββ-decay of delayed-neutron emitters. From the comparison of this intensity with the intensity of neutron emission a constraint on the (n, γγ) cross section for highly unstable neutron-rich nuclei can be deduced. A surprisingly large γγ branching was observed for a number of isotopes which might indicate the need to increase by a large factor the Hauser-Feshbach (n, γγ) cross-section estimates that impact on r process abundance calculations.