Isomeric Cross Sections For ⁸⁷Y(n,$$γ$$) From Surrogate (p,d$$γ$$) Data

Technical Report · Fri Mar 22 04:00:00 EDT 2019

DOI:https://doi.org/10.2172/1544968· OSTI ID:1544968

Escher, Jutta E. ^[1]

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1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Cross sections for compound-nuclear reactions involving unstable targets are important for many applications, but can often not be measured directly. Recently, I developed a method for extracting cross sections for neutron-capture on unstable isotopes from indirect (surrogate) reaction data. I applied the method to ^$89$Y(p,$$γ$$) data, which were supplied by the LLNL experimental nuclear physics program, to determine the ^$87$Y(n,$$γ$$) (activation) cross section. Here, I extend the approach further, in order to determine cross sections for reactions that start and/or end at isomeric states. In particular, I determine cross sections, along with uncertainties, for seven additional reactions: ^$87$Y(n,$$γ$$)^$88gs$Y, ^$87$Y(n,$$γ$$)^$88m1$Y, ^$87$Y(n,$$γ$$)^$88m2$Y, ^$87m$Y(n,$$γ$$)^$88$Y (activation), ^$87m$Y(n,$$γ$$)^$88gs$Y, ^$87m$Y(n,$$γ$$)^$88m1$Y, ^$87m$Y(n,$$γ$$)^$88m2$Y. These cross sections cannot be measured directly.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC52-07NA27344
• OSTI ID: 1544968
• Report Number(s): LLNL-TR--770401; 961775
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS