S-process branching at /sup 151/Sm
Journal Article
·
· Astrophys. J.; (United States)
The < or =-process branching in the mass region 150< or =A< or =154, initiated by the /sup 151/Sm ..beta../sup -/ decay, is reinvestigated, particularly in connection with the solar /sup 152/Gd abundance. The Maxwellian averaged neutron caputre cross sections for kT = 25 keV are measured for /sup 152/Sm, /sup 151/Eu (to the 9.3 hour isomeric state of /sup 152/Eu), /sup 152/Gd, /sup 158/Gd, and /sup 160/Gd. The ..beta..-decay rates of the unstable nuclei involved in the branching are calculated theoretically. In addition, it is shown that the thermal equilibration between the ground state and the isomeric state in /sup 152/Eu under plausible s-process conditions is achieved on a time scale shorter than those for ..beta..-decay and neutron capture. With these results and the neutron capture cross sections from literature for the other concerned nuclei, a branching analysis is performed within the steady flow model of the s-process. This study yields constraints for s-process models, particularly with regard to temperature and neutron density.
- Research Organization:
- Kernforschungszentrum Karlsruhe, Insitute fuer Kernphysik III
- OSTI ID:
- 6675265
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 278:1; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ALPHA DECAY RADIOISOTOPES
BARYON REACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
CROSS SECTIONS
DATA ANALYSIS
DECAY
DETECTION
ENERGY-LEVEL TRANSITIONS
EUROPIUM 151
EUROPIUM ISOTOPES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GADOLINIUM 152
GADOLINIUM ISOTOPES
HADRON REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEOSYNTHESIS
ODD-EVEN NUCLEI
RADIATION DETECTION
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
S PROCESS
SAMARIUM 151
SAMARIUM ISOTOPES
STABLE ISOTOPES
STAR EVOLUTION
SYNTHESIS
YEARS LIVING RADIOISOTOPES
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ALPHA DECAY RADIOISOTOPES
BARYON REACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
CROSS SECTIONS
DATA ANALYSIS
DECAY
DETECTION
ENERGY-LEVEL TRANSITIONS
EUROPIUM 151
EUROPIUM ISOTOPES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GADOLINIUM 152
GADOLINIUM ISOTOPES
HADRON REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEOSYNTHESIS
ODD-EVEN NUCLEI
RADIATION DETECTION
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
S PROCESS
SAMARIUM 151
SAMARIUM ISOTOPES
STABLE ISOTOPES
STAR EVOLUTION
SYNTHESIS
YEARS LIVING RADIOISOTOPES