Gamow-Teller strength distributions at finite temperatures and electron capture in stellar environments

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.015804· OSTI ID:21388864

Dzhioev, Alan A; Vdovin, A I ^[1]; Ponomarev, V Yu ^[2]; Wambach, J ^[2]; Langanke, K ^[2]; Martinez-Pinedo, G ^[3]

---

1. Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, RU-141980 Dubna (Russian Federation)
2. Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt (Germany)
3. GSI Helmholtzzentrum fuer Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt (Germany)

We propose a new method to calculate stellar weak-interaction rates. It is based on the thermofield dynamics formalism and allows calculation of the weak-interaction response of nuclei at finite temperatures. The thermal evolution of the GT{sub +} distributions is presented for the sample nuclei {sup 54,56}Fe and {sup 76,78,80}Ge. For Ge we also calculate the strength distribution of first-forbidden transitions. We show that thermal effects shift the GT{sub +} centroid to lower excitation energies and make possible negative- and low-energy transitions. In our model we demonstrate that the unblocking effect for GT{sub +} transitions in neutron-rich nuclei is sensitive to increasing temperature. The results are used to calculate electron capture rates and are compared to those obtained from the shell model.

• OSTI ID: 21388864
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevC.81.015804; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPUTERIZED SIMULATION
DISTRIBUTION
ELECTRON CAPTURE
EXCITATION
FORBIDDEN TRANSITIONS
GAMOW-TELLER RULES
GERMANIUM 76
GERMANIUM 78
GERMANIUM 80
IRON 54
IRON 56
NEUTRON-RICH ISOTOPES
SHELL MODELS
STARS
WEAK INTERACTIONS
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
GERMANIUM ISOTOPES
HOURS LIVING RADIOISOTOPES
INTERACTIONS
INTERMEDIATE MASS NUCLEI
IRON ISOTOPES
ISOTOPES
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEI
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SIMULATION
STABLE ISOTOPES