Neutron-proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei Nb-82(41) and Tc-86(43)

Research output: Contribution to journalArticle


The low-lying structures of the self-conjugate (N = Z) nuclei Nb-82(41)41 and Tc-86(43)43 have been investigated using isomeric-decay spectroscopy following the projectile fragmentation of a Ag-107 beam. These represent the heaviest odd-odd N = Z nuclei in which internal decays have been identified to date. The resulting level schemes shed light on the shape evolution along the N = Z line between the doubly-magic systems Ni-56(28) and Sn-100(50) and support a preference for T = 1 states in T-z = 0 odd-odd nuclei at low excitation energies associated with a T = 1 neutron-proton pairing gap. Comparison with Projected Shell Model calculations suggests that the decay in Nb-82 may be interpreted as an isospin-changing K isomer.


  • A B Garnsworthy
  • P H Regan
  • L Caceres
  • S Pietri
  • Y Sun
  • M Gorska
  • Zs Podolyak
  • S J Steer
  • Robert Hoischen
  • A Heinz
  • F Becker
  • P Bednarczyk
  • P Doornenbal
  • H Geissel
  • J Gerl
  • H Grawe
  • J Grebosz
  • A Kelic
  • I Kojouharov
  • N Kurz
  • F Montes
  • W Prokopowicz
  • T Saito
  • H Schaffner
  • S Tashenov
  • E Werner-Malento
  • H J Wollersheim
  • G Benzoni
  • B B Blank
  • C Brandau
  • A M Bruce
  • F Camera
  • W N Catford
  • I J Cullen
  • Zs Dombradi
  • E Estevez
  • W Gelletly
  • G Ilie
  • J Jolie
  • G A Jones
  • A Jungclaus
  • M Kmiecik
  • F G Kondev
  • T Kurtukian-Nieto
  • S Lalkovski
  • Z Liu
  • A Maj
  • S Myalski
  • M Pfutzner
  • S Schwertel
  • T Shizuma
  • A J Simons
  • P M Walker
  • O Wieland
  • F R Xu
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Pages (from-to)326-330
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number4
Publication statusPublished - 2008
Publication categoryResearch