Modification of nuclear transitions in stellar plasma by electronic processes: K isomers in {sup 176}Lu and {sup 180}Ta under s-process conditions

Journal Article · Sat May 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.055808· OSTI ID:21389078

Gosselin, G; Morel, P; Mohr, P ^[1]

---

1. CEA, DAM, DIF, Arpajon F-91297 (France)

The influence of the stellar plasma on the production and destruction of K isomers is studied for the examples {sup 176}Lu and {sup 180}Ta. Individual electromagnetic transitions are enhanced predominantly by nuclear excitation by electron capture, whereas the other mechanisms of electron scattering and nuclear excitation by electron transition give only minor contributions. It is found that individual transitions can be enhanced significantly for low transition energies below 100 keV. Transitions with higher energies above 200 keV are practically not affected. Although one low-energy transition in {sup 180}Ta is enhanced by up to a factor of 10, the stellar transition rates from low-K to high-K states via so-called intermediate states in {sup 176}Lu and {sup 180}Ta do not change significantly under s-process conditions. The s-process nucleosynthesis of {sup 176}Lu and {sup 180}Ta remains essentially unchanged.

• OSTI ID: 21389078
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 81; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
ELECTRON CAPTURE
ELECTRON CAPTURE RADIOISOTOPES
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVOLUTION
EXCITATION
FERMIONS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
INTERMEDIATE STATE
INTERNAL CONVERSION RADIOISOTOPES
ISOMERS
ISOTOPES
KEV RANGE
KEV RANGE 100-1000
LEPTONS
LUTETIUM 176
LUTETIUM ISOTOPES
MODIFICATIONS
NUCLEI
NUCLEOSYNTHESIS
ODD-ODD NUCLEI
PLASMA
RADIOISOTOPES
RARE EARTH NUCLEI
S PROCESS
SCATTERING
STAR EVOLUTION
SYNTHESIS
TANTALUM 180
TANTALUM ISOTOPES
YEARS LIVING RADIOISOTOPES