Skip to Main content Skip to Navigation
Journal articles

β-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N=82 Shell Gap: Implications for the Mechanism and Universality of the Astrophysical r Process

Abstract : The β-decay half-lives of 110 neutron-rich isotopes of the elements from Rb37 to Sn50 were measured at the Radioactive Isotope Beam Factory. The 40 new half-lives follow robust systematics and highlight the persistence of shell effects. The new data have direct implications for r-process calculations and reinforce the notion that the second (A≈130) and the rare-earth-element (A≈160) abundance peaks may result from the freeze-out of an (n,γ)⇄(γ,n) equilibrium. In such an equilibrium, the new half-lives are important factors determining the abundance of rare-earth elements, and allow for a more reliable discussion of the r process universality. It is anticipated that universality may not extend to the elements Sn, Sb, I, and Cs, making the detection of these elements in metal-poor stars of the utmost importance to determine the exact conditions of individual r-process events.
Document type :
Journal articles
Complete list of metadatas

http://hal.in2p3.fr/in2p3-01150840
Contributor : Emmanuelle Vernay <>
Submitted on : Tuesday, May 12, 2015 - 8:11:48 AM
Last modification on : Thursday, November 19, 2020 - 12:59:12 PM

Links full text

Identifiers

Collections

IN2P3 | LPSC | CNRS | GEPI | UGA

Citation

G. Lorusso, S. Nishimura, Z Y. Xu, A. Jungclaus, Y. Shimizu, et al.. β-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N=82 Shell Gap: Implications for the Mechanism and Universality of the Astrophysical r Process. Physical Review Letters, American Physical Society, 2015, 114, pp.192501. ⟨10.1103/PhysRevLett.114.192501⟩. ⟨in2p3-01150840⟩

Share

Metrics

Record views

278