Regular Article - Experimental Physics

The European Physical Journal A

, Volume 35, Issue 2, pp 167-170

Lifetime measurement of the six-quasiparticle isomer in 140Nd and evidence for an isomer above the 19/2+ state in 139Nd

  • M. FerratonAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI Email author 
  • , R. BourgainAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
  • , C. M. PetracheAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
  • , D. VerneyAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
  • , F. IbrahimAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
  • , N. de SérévilleAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
  • , S. FranchooAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
  • , M. LeboisAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
  • , C. Phan VietAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
    • , L. SaguiAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
    • , I. StefanAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
    • , J. F. ClavelinAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI
    • , M. VilmayAffiliated withInstitut de Physique Nucléaire, IN2P3-CNRS and Université Paris-Sud XI

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Abstract.

The lifetime of the recently discovered six-quasiparticle (6-qp) isomer in 140Nd has been measured using the 126Te(18O, 4n) reaction and the pulsed-beam technique at the Institut de Physique Nucléaire (IPN) Orsay. The deduced lifetime of the 6-qp isomer in 140Nd of 1.23(7)μs supports the 20+ spin-parity assignment to the isomeric state which is based on a spherical configuration that coexists with the triaxial bands observed in this spin range. Evidence for delayed components for the transitions below the 19/2+ state in 139Nd was observed, with an apparent half-life of 272(4)ns.

PACS.

27.60.+j 90 < A < 149 21.60.-n Nuclear structure models and methods 21.10.Tg Lifetimes, widths