Nuclear structure of sup 176 Lu and its astrophysical consequences. II. sup 176 Lu, a thermometer for stellar helium burning

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.2839· OSTI ID:5133928

Klay, N; Kaeppeler, F; Beer, H; Schatz, G ^[1]

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1. Kernforschungszentrum Karlsruhe, Institut fuer Kernphysik, D-7500 Karlsruhe (Germany)

On the basis of the improved level scheme of {sup 176}Lu it is demonstrated that the stellar {ital s}-process production as well as the stellar beta decay rate of that nucleus depend strongly on temperature. This behavior results from the completely different half-lives of the ground state and the isomer; since these states are coupled by induced transitions in the hot stellar photon bath, the effective half-life of {sup 176}Lu is drastically reduced. The 5{sup {minus}} state at 838.64 keV was identified as the most efficient mediating level. Consequently, {sup 176}Lu can no longer be considered as a chronometer for the age of the {ital s} process; instead, it can be interpreted as an {ital s}-process thermometer yielding a temperature range between 2.4{times}10{sup 8} to 3.6{times}10{sup 8} K.

• OSTI ID: 5133928
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 44:6; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
ASTROPHYSICS
BARYON REACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BOSONS
BRANCHING RATIO
CAPTURE
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DECAY
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
FLUIDS
GALAXIES
GASES
HADRON REACTIONS
HALF-LIFE
HELIUM
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOTOPES
LUTETIUM 175 TARGET
LUTETIUM 176
LUTETIUM ISOTOPES
MASSLESS PARTICLES
NEUTRON REACTIONS
NONMETALS
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-ODD NUCLEI
PARITY
PARTICLE PROPERTIES
PHOTONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RARE GASES
S PROCESS
SPIN
STAR EVOLUTION
TARGETS
TEMPERATURE DEPENDENCE
YEARS LIVING
YEARS LIVING RADIOISOTOPES