The European Physical Journal A

, 42:489

Structure of neutron-rich nuclei around the N = 126 closed shell; the yrast structure of 205Au126 up to spin-parity \(I^{\pi}\) = (19/2+)

  • Zs. Podolyák
  • S. J. Steer
  • S. Pietri
  • M. Górska
  • P. H. Regan
  • D. Rudolph
  • A. B. Garnsworthy
  • R. Hoischen
  • J. Gerl
  • H. J. Wollersheim
  • H. Grawe
  • K. H. Maier
  • F. Becker
  • P. Bednarczyk
  • L. Cáceres
  • P. Doornenbal
  • H. Geissel
  • J. Grebosz
  • A. Kelic
  • I. Kojouharov
  • N. Kurz
  • F. Montes
  • W. Prokopowicz
  • T. Saito
  • H. Schaffner
  • S. Tashenov
  • A. Heinz
  • T. Kurtukian-Nieto
  • G. Benzoni
  • M. Pfützner
  • A. Jungclaus
  • D. L. Balabanski
  • C. Brandau
  • B. A. Brown
  • A. M. Bruce
  • W. N. Catford
  • I. J. Cullen
  • Zs. Dombrádi
  • M. E. Estevez
  • W. Gelletly
  • G. Ilie
  • J. Jolie
  • G. A. Jones
  • M. Kmiecik
  • F. G. Kondev
  • R. Krücken
  • S. Lalkovski
  • Z. Liu
  • A. Maj
  • S. Myalski
  • S. Schwertel
  • T. Shizuma
  • P. M. Walker
  • E. Werner-Malento
  • O. Wieland
Regular Article - Experimental Physics

Abstract

Heavy neutron-rich nuclei have been populated through the relativistic fragmentation of a \(\ensuremath ^{208}_{\ 82}{\rm Pb}\) beam at \(\ensuremath E/A = 1\) GeV on a \(\ensuremath 2.5 {\rm g/cm^2}\) thick Be target. The synthesised nuclei were selected and identified in-flight using the fragment separator at GSI. Approximately 300 ns after production, the selected nuclei were implanted in an \(\ensuremath \sim 8\) mm thick perspex stopper, positioned at the centre of the RISING \(\ensuremath \gamma\) -ray detector spectrometer array. A previously unreported isomer with a half-life \(\ensuremath T_{1/2} = 163(5)\) ns has been observed in the N = 126 closed-shell nucleus \(\ensuremath ^{205}_{\ 79}{\rm Au}\) . Through \( \gamma\) -ray singles and \( \gamma\) -\( \gamma\) coincidence analysis a level scheme was established. The comparison with a shell model calculation tentatively identifies the spin-parity of the excited states, including the isomer itself, which is found to be \(\ensuremath I^{\pi} = (19/2^+)\) .

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Zs. Podolyák
    • 1
  • S. J. Steer
    • 1
  • S. Pietri
    • 1
  • M. Górska
    • 2
  • P. H. Regan
    • 1
  • D. Rudolph
    • 3
  • A. B. Garnsworthy
    • 1
    • 4
  • R. Hoischen
    • 3
  • J. Gerl
    • 2
  • H. J. Wollersheim
    • 2
  • H. Grawe
    • 2
  • K. H. Maier
    • 5
    • 6
  • F. Becker
    • 2
  • P. Bednarczyk
    • 2
    • 5
  • L. Cáceres
    • 2
    • 7
  • P. Doornenbal
    • 2
    • 8
  • H. Geissel
    • 2
  • J. Grebosz
    • 2
    • 5
  • A. Kelic
    • 2
  • I. Kojouharov
    • 2
  • N. Kurz
    • 2
  • F. Montes
    • 2
  • W. Prokopowicz
    • 2
  • T. Saito
    • 2
  • H. Schaffner
    • 2
  • S. Tashenov
    • 2
  • A. Heinz
    • 4
  • T. Kurtukian-Nieto
    • 9
  • G. Benzoni
    • 10
  • M. Pfützner
    • 11
  • A. Jungclaus
    • 7
  • D. L. Balabanski
    • 12
  • C. Brandau
    • 1
  • B. A. Brown
    • 13
    • 1
  • A. M. Bruce
    • 14
  • W. N. Catford
    • 1
  • I. J. Cullen
    • 1
  • Zs. Dombrádi
    • 15
  • M. E. Estevez
    • 16
  • W. Gelletly
    • 1
  • G. Ilie
    • 8
  • J. Jolie
    • 8
  • G. A. Jones
    • 1
  • M. Kmiecik
    • 5
  • F. G. Kondev
    • 17
  • R. Krücken
    • 18
  • S. Lalkovski
    • 14
  • Z. Liu
    • 1
  • A. Maj
    • 5
  • S. Myalski
    • 5
  • S. Schwertel
    • 18
  • T. Shizuma
    • 1
    • 19
  • P. M. Walker
    • 1
  • E. Werner-Malento
    • 2
  • O. Wieland
    • 10
  1. 1.Department of PhysicsUniversity of SurreyGuildfordUK
  2. 2.GSIDarmstadtGermany
  3. 3.Department of PhysicsLund UniversityLundSweden
  4. 4.WNSLYale UniversityNew HavenUSA
  5. 5.The Institute of Nuclear PhysicsKrakówPoland
  6. 6.Department of PhysicsUniversity of the West of ScotlandPaisleyScotland
  7. 7.Departmento de Fisica TeóricaUniversidad Autonoma de MadridMadridSpain
  8. 8.IKPUniversität zu KölnKölnGermany
  9. 9.Universidad de Santiago de CompostelaSantiago de CampostelaSpain
  10. 10.INFNUniversità degli Studi di MilanoMilanoItaly
  11. 11.IEPWarsaw UniversityWarsawPoland
  12. 12.INRNEBulgarian Academy of SciencesSofiaBulgaria
  13. 13.NSCLMichigan State UniversityEast LansingUSA
  14. 14.School of Environment and TechnologyUniversity of BrightonBrightonUK
  15. 15.Institute for Nuclear ResearchDebrecenHungary
  16. 16.Instituto de Fisica CorpuscularValenciaSpain
  17. 17.Nuclear Engineering DivisionArgonne National LaboratoryArgonneUSA
  18. 18.Physik Department E12Technische Universität MünchenGarchingGermany
  19. 19.Japan Atomic Energy AgencyKyotoJapan

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