The population of metastable states as a probe of relativistic-energy fragmentation reactions

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Isomeric ratios have been measured for high-spin states in Po-198,200,206,208(84), At-208,209,210,211(85), Rn-210,211,212,213,214(86), Fr-208,211,212,213,214(87), Ra-210,211,212,214,215(88), and Ac-215(89) following the projectile fragmentation of a 1 AGeV U-238 beam by a Be-9 target at GSI Helmholtzzentrum fur Schwerionenforschung. The fragments were separated in the fragment separator (FRS) and identified by means of energy loss and time-of-flight techniques. They were brought to rest at the centre of the RISING gamma-ray detector array and intensities of gamma rays emitted in the decay of isomeric states with half-lives between 100 ns and 40 mu s and spin values up to 55/2 (h) over bar were used to obtain the corresponding isomeric ratios. The data are compared to theoretical isomeric ratios calculated in the framework of the abrasion-ablation model. Large experimental enhancements are obtained for high-spin isomers in comparison to expected values. (C) 2013 Elsevier B.V. All rights reserved.


  • A.M. Denis Bacelar
  • A.M. Bruce
  • Zs. Podolyák
  • N. Al-Dahan
  • M. Górska
  • S. Lalkovski
  • S. Pietri
  • M.V. Ricciardi
  • A. Algora
  • N. Alkhomashi
  • J. Benlliure
  • P. Boutachkov
  • A. Bracco
  • E. Calore
  • E. Casarejos
  • I.J. Cullen
  • A.Y. Deo
  • P. Detistov
  • Zs. Dombradi
  • C. Domingo-Pardo
  • M. Doncel
  • F. Farinon
  • G.F. Farrelly
  • H. Geissel
  • W. Gelletly
  • J. Gerl
  • N. Goel
  • J. Grȩbosz
  • Robert Hoischen
  • I. Kojouharov
  • N. Kurz
  • S. Leoni
  • F. Molina
  • D. Montanari
  • A.I. Morales
  • A. Musumarra
  • D.R. Napoli
  • R. Nicolini
  • C. Nociforo
  • A. Prochazka
  • W. Prokopowicz
  • P.H. Regan
  • B. Rubio
  • K.-H. Schmidt
  • H. Schaffner
  • S.J. Steer
  • K. Steiger
  • P. Strmen
  • T.P.D. Swan
  • I. Szarka
  • J.J. Valiente-Dobón
  • S. Verma
  • P.M. Walker
  • H. Weick
  • H.J. Wollersheim
Enheter & grupper

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik
Sidor (från-till)302-306
TidskriftPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
StatusPublished - 2013
Peer review utfördJa


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