New calculations of gross β-decay properties for astrophysical applications: Speeding-up the classical r process

Details New calculations of gross β-decay properties for astrophysical applications: Speeding-up the classical r process New calculations of gross β-decay properties for astrophysical applications: Speeding-up the classical r process

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phrvc..67e5802m&link_type=abstract

Physical Review C, vol. 67, Issue 5, id. 055802

Other

59

Beta Decay, Double Beta Decay, Electron And Muon Capture, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Supernovae, Origin, Formation, And Abundances Of The Elements

Scientific paper

Recent compilations of experimental gross β-decay properties, i.e., half-lives (T1/2) and neutron-emission probabilities (Pn), are compared to improved global macroscopic-microscopic model predictions. The model combines calculations within the quasiparticle (QP) random-phase approximation for the Gamow-Teller (GT) part with an empirical spreading of the QP strength and the gross theory for the first-forbidden part of β- decay. Nuclear masses are either taken from the 1995 data compilation of Audi et al., when available, otherwise from the finite-range droplet model. Especially for spherical and neutron-(sub-)magic isotopes a considerable improvement compared to our earlier predictions for pure GT decay (ADNDT, 1997) is observed. T1/2 and Pn values up to the neutron drip line have been used in r-process calculations within the classical “waiting-point” approximation. With the new nuclear-physics input, a considerable speeding-up of the r-matter flow is observed, in particular at those r-abundance peaks which are related to magic neutron-shell closures.

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