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Title: β-decay spectroscopy of r-process nuclei with N = 126 at KISS

The β-decay properties of nuclei with N = 126, which are believed to act as progenitors in the rapid neutron capture (r-) process path forming the third peak (A ∼ 195) in the observed r-abundance element distribution, are considered critical for understanding the production of heavy elements such as gold and platinum at astrophysical sites. We have constructed the KEK Isotope Separation System (KISS), which consists of a gas cell based laser ion source (atomic number selection) and an isotope separation on-line (ISOL) (mass number selection), to produce pure low-energy beams of neutron-rich isotopes around N = 126 and to study their β-decay properties, which are also of interest for astrophysics. The isotopes of interest will be produced by multi-nucleon transfer reactions in heavy ion collisions (e.g. {sup 136}Xe projectile on {sup 198}Pt target). KISS will allow us to study unknown isotopes produced in weak reaction channels under low background conditions. We successfully extracted the stable {sup 56}Fe beam from KISS at the last commissioning on-line experiment with the extraction efficiency of 0.25% and beam purity of more than 98%. We can access the nuclei with N = 126 and measure their half-lives using the KISS in the case ofmore » the extraction efficiency of 0.1%.« less
Authors:
; ; ; ; ; ;  [1] ;  [2] ; ;  [3]
  1. Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801 (Japan)
  2. Seoul National University, Seoul 151-742 (Korea, Republic of)
  3. Tsukuba University, Ibaraki 305-0006 (Japan)
Publication Date:
OSTI Identifier:
22280490
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1594; Journal Issue: 1; Conference: OMEG12: 12. international symposium on origin of matter and evolution of galaxies, Tsukuba (Japan), 18-21 Nov 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASTROPHYSICS; BETA DECAY; BETA SPECTROSCOPY; CAPTURE; ELEMENT ABUNDANCE; GAMMA SPECTROSCOPY; HALF-LIFE; HEAVY ION REACTIONS; IRON 56; ISOTOPE SEPARATION; JAPANESE ORGANIZATIONS; MULTI-NUCLEON TRANSFER REACTIONS; NEUTRON REACTIONS; NEUTRON-RICH ISOTOPES; PLATINUM 198; R PROCESS; XENON 136