Journal
PHYSICS LETTERS B
Volume 744, Issue -, Pages 137-141Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2015.03.047
Keywords
Isotope separation in flight; Spatial isomer separation; Multiple-reflection time-of-flight mass spectrometer; Isomer; Isomeric beam; Excitation energy; Isomeric ratio; Po-211 ions
Funding
- German Federal Ministry for Education and Research (BMBF) [05P12RGFN8]
- Hessian Ministry for Science and Art (HMWK) through the LOEWE Center HICforFAIR
- HGS-HIRe
- Justus-Liebig-Universitat Giessen and GSI under the JLU-GSI strategic Helmholtz partnership agreement
Ask authors/readers for more resources
Po-211 ions in the ground and isomeric states were produced via U-238 projectile fragmentation at 1000 MeV/u. The Po-211 ions were spatially separated in flight from the primary beam and other reaction products by the fragment separator FRS. The ions were energy-bunched, slowed-down and thermalized in a gas-filled cryogenic stopping cell (CSC). They were then extracted from the CSC and injected into a high-resolution multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). The excitation energy of the isomer and, for the first time, the isomeric-to-ground state ratio were determined from the measured mass spectrum. In the subsequent experimental step, the isomers were spatially separated from the ions in the ground state by an ion deflector and finally collected with a silicon detector for decay spectroscopy. This pioneering experimental result opens up unique perspectives for isomer-resolved studies. With this versatile experimental method new isomers with half-lives longer than a few milliseconds can be discovered and their decay properties can be measured with highest sensitivity and selectivity. These experiments can be extended to studies with isomeric beams in nuclear reactions. (C) 2015 The Authors. Published by Elsevier B.V.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available