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Title: Half-life measurements of isomeric states populated in projectile fragmentation

Abstract

The half-lives of excited isomeric states observed in {sup 195}Au, {sup 201}Tl and {sup 215}Rn are reported for the first time. Delayed {gamma}-rays were correlated with nuclei produced in the projectile fragmentation of relativistic {sup 238}U ions, unambiguously identified in terms of their atomic number (Z) and mass-to-charge ratio (A/Q) after traversing an in-flight separator. The observation of a long-lived isomeric state in {sup 195}Au with t{sub 1/2} = 16{sub -4}{sup +8}{mu}s is presented. Two shorter-lived isomeric states were detected in {sup 201}Tl and {sup 215}Rn with t{sub 1/2} = 95{sub -21}{sup +39} and 57{sub -12}{sup +21} ns respectively. In total 24 isomeric states were identified in different nuclei from Pt to Rn (A {approx} 200) during the current study, the majority of which were previously reported. The wealth of spectroscopic data provides the opportunity to determine the isomeric ratios over a wide range of Z, A and angular momentum (I h) of the reaction products. In particular, high-spin states with I Greater-Than-Or-Equivalent-To 18 h provide a robust test of theoretical models of fragmentation.

Authors:
;  [1]
  1. Department of Physics, University of Surrey, Guildford, GU2 7XH (United Kingdom)
Publication Date:
OSTI Identifier:
22075632
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1491; Journal Issue: 1; Conference: Conference on nuclear structure and dynamics 2012, Opatija (Croatia), 9-13 Jul 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; EXCITED STATES; GOLD 195; HALF-LIFE; HEAVY ION REACTIONS; HIGH SPIN STATES; ISOMER RATIO; ISOMERIC NUCLEI; MINUS-PLUS RATIO; NUCLEAR FRAGMENTATION; NUCLEAR STRUCTURE; RADON 215; RELATIVISTIC RANGE; SPIN; THALLIUM 201; TIME DELAY; URANIUM 238

Citation Formats

Bowry, M., and Podolay, Zs. Half-life measurements of isomeric states populated in projectile fragmentation. United States: N. p., 2012. Web. doi:10.1063/1.4764266.
Bowry, M., & Podolay, Zs. Half-life measurements of isomeric states populated in projectile fragmentation. United States. doi:10.1063/1.4764266.
Bowry, M., and Podolay, Zs. Sat . "Half-life measurements of isomeric states populated in projectile fragmentation". United States. doi:10.1063/1.4764266.
@article{osti_22075632,
title = {Half-life measurements of isomeric states populated in projectile fragmentation},
author = {Bowry, M. and Podolay, Zs.},
abstractNote = {The half-lives of excited isomeric states observed in {sup 195}Au, {sup 201}Tl and {sup 215}Rn are reported for the first time. Delayed {gamma}-rays were correlated with nuclei produced in the projectile fragmentation of relativistic {sup 238}U ions, unambiguously identified in terms of their atomic number (Z) and mass-to-charge ratio (A/Q) after traversing an in-flight separator. The observation of a long-lived isomeric state in {sup 195}Au with t{sub 1/2} = 16{sub -4}{sup +8}{mu}s is presented. Two shorter-lived isomeric states were detected in {sup 201}Tl and {sup 215}Rn with t{sub 1/2} = 95{sub -21}{sup +39} and 57{sub -12}{sup +21} ns respectively. In total 24 isomeric states were identified in different nuclei from Pt to Rn (A {approx} 200) during the current study, the majority of which were previously reported. The wealth of spectroscopic data provides the opportunity to determine the isomeric ratios over a wide range of Z, A and angular momentum (I h) of the reaction products. In particular, high-spin states with I Greater-Than-Or-Equivalent-To 18 h provide a robust test of theoretical models of fragmentation.},
doi = {10.1063/1.4764266},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1491,
place = {United States},
year = {2012},
month = {10}
}