beta-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
- Title
- beta-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
- Author
- 김용균
- Keywords
- METAL-POOR STARS; PROCESS NUCLEOSYNTHESIS; DRIVEN WINDS; EARLY GALAXY; ELEMENTS; SUPERNOVAE; PHYSICS; MERGERS; ORIGIN; STABILITY
- Issue Date
- 2015-05
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v. 114, NO 19, Page. 25011-25017
- Abstract
- The beta-decay half-lives of 110 neutron-rich isotopes of the elements from 37 Rb to 50 Sn 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 approximate to 130) and the rare-earth-element (A approximate to 160) abundance peaks may result from the freeze-out of an (n, gamma) reversible arrow (gamma, 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.
- URI
- http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.192501http://hdl.handle.net/20.500.11754/24683
- ISSN
- 0031-9007; 1079-7114
- DOI
- 10.1103/PhysRevLett.114.192501
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
- Files in This Item:
- beta-Decay Half-Lives of 110 Neutron-Rich Nuclei across the N=82 Shell Gap Implications for the Mechanism and Universality of the Astrophysical r P...Download
- Export
- RIS (EndNote)
- XLS (Excel)
- XML