Gießen 2007 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Kernphysik / Spektroskopie
HK 25.4: Talk
Wednesday, March 14, 2007, 12:00–12:15, D
Isomeric Spectroscopy in the N=Z=41 nucleus 82Nb — •Lucia Cáceres1,2, Magdalena Górska1, Andrea Jungclaus2, Paddy Regan3, and Adam Garnsworthy3 for the RISING collaboration — 1GSI Darmstadt, Planckstraβe 1, Darmstadt, Germany — 2Departamento de Física Teórica, Universidad Autónoma de Madrid, Spain — 3Department of Physics, University of Surrey, Guildford, UK
The N=Z=41 nucleus 82Nb has been studied following the projectile fragmentation of a 107Ag beam at an energy of 750 MeV/u on a 4007 mg/cm2 9Be target. The experiment was part of the Stopped Beam Campaign using the Rare Isotope Spectroscopic Investigation at GSI (RISING) setup. Its main goal was the identification of isomeric states of the N=Z odd-odd nuclei in the 80<A<90 region which sheds light on the competition between T=1 and T=0 pairing correlations. The projectile fragments were separated by the GSI FRagment Separator (FRS) and identified unambiguously by means of their magnetic rigidity, time of flight and energy loss. The 82Nb ions were stopped in a plastic layer of 7 mm thickness. The stopper was viewed by a γ-ray array of EUROBALL Cluster detectors. The ground state of 82Nb has been previously reported to be of a T=1, I=0+ nature. In the current work three delayed γ-ray transition with energies of 123 keV, 418 keV and 638 keV were identified and associated with the 82Nb residues. The isomeric half-life value was extracted. The status of the experimental analysis, results and a discussion of the structure based on the systematic of T=1 isobars 78Sr, 82Zr, 86Mo will be presented.