dorsal/arxiv
View SchemaElectromagnetic excitation rates for nuclear isomers in a hot dense plasma
| Authors | T. C. Luu, J. L. Friar, A. C. Hayes |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0412092 |
| URL | https://arxiv.org/abs/nucl-th/0412092 |
Abstract
In high neutron flux environments where isomers can be strongly populated by nucleonic reactions, isotope abundances from reaction network chains can be affected by the population of nuclear isomers. At high temperatures and densities there is the additional possibility of populating these isomers electromagnetically. Here we examine the rates for electromagnetic excitation of the isotopes of several isomers of interest both in astrophysics and applied physics (e.g. 235U, 193Ir, and 87Y,88Y). We consider six possible electromagnetic processes, namely, photo-absorption, inverse internal conversion, inelastic electron scattering, Coulomb excitation, (gamma,gamma) and (e,e'gamma) reactions. We find that for plasma temperatures kT~ 1-10 keV the electromagnetic reactions rates are negligible. Thus, we conclude that reaction network calculations do not need to include for the possibility of electromagnetically exciting nuclear isomers. This is true in both stellar and terrestrial thermonuclear explosions, as well as in plasma conditions expected at the National Ignition Facility.
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"abstract": "In high neutron flux environments where isomers can be strongly populated by\nnucleonic reactions, isotope abundances from reaction network chains can be\naffected by the population of nuclear isomers. At high temperatures and\ndensities there is the additional possibility of populating these isomers\nelectromagnetically. Here we examine the rates for electromagnetic excitation\nof the isotopes of several isomers of interest both in astrophysics and applied\nphysics (e.g. 235U, 193Ir, and 87Y,88Y). We consider six possible\nelectromagnetic processes, namely, photo-absorption, inverse internal\nconversion, inelastic electron scattering, Coulomb excitation, (gamma,gamma)\nand (e,e\u0027gamma) reactions. We find that for plasma temperatures kT~ 1-10 keV\nthe electromagnetic reactions rates are negligible. Thus, we conclude that\nreaction network calculations do not need to include for the possibility of\nelectromagnetically exciting nuclear isomers. This is true in both stellar and\nterrestrial thermonuclear explosions, as well as in plasma conditions expected\nat the National Ignition Facility.",
"arxiv_id": "nucl-th/0412092",
"authors": [
"T. C. Luu",
"J. L. Friar",
"A. C. Hayes"
],
"categories": [
"nucl-th"
],
"title": "Electromagnetic excitation rates for nuclear isomers in a hot dense plasma",
"url": "https://arxiv.org/abs/nucl-th/0412092"
},
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