Estimates for Electromagnetically Exciting Nuclear Isomers

Details Estimates for Electromagnetically Exciting Nuclear Isomers Estimates for Electromagnetically Exciting Nuclear Isomers

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dnp.jc001l&link_type=abstract

American Physical Society, Division of Nuclear Physics Meeting, 27-30 October, 2004, Chicago, IL. MEETING ID: DNP04., abstract #

Physics

Nuclear Physics

Scientific paper

There has been recent interest in the possible roles that nuclear isomers (both spin and shape) might play in high temperature, high neutron flux environments. Such environments are readily available in both applied physics and astrophysical settings. For example, in certain astrophysical environments, a significant change in the effective lifetimes of certain even-even nuclei can occur if their shape isomers are strongly populated. Such events can strongly effect the roles of 'waiting point' nuclei of proton-rich reactions in thermo-nuclear explosions, such as those that cause Type-I X-ray bursts. More mundane examples include the use of spin-isomers as a post-diagnostic tool for studying ignited ICF capsules or terra-based nuclear explosions. Isomers are strongly populated by nucleonic interactions. If temperatures are high enough, there is the additional possibility of populating isomers electromagnetically. Here we examine the the rates for electromagnetic excitation of several spin isomers relevant both in astrophysics and applied physics. We consider six possible electromagnetic processes, namely, photo-absorption, inverse internal conversion, inelastic electron scattering, Coulomb excitation, (γ,γ') and (e,e'γ) reactions. We find that for plasma temperatures T ˜ 1-10 keV the electromagnetic reactions rates are negligible compared to neutron reaction rates. Thus, we conclude that these isomers are only populated by neutron excitation.

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