Regular Article - Nuclear Structure and Reactions
Decay study of neutron-rich zirconium isotopes employing a Penning trap as a spectroscopy tool
Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL), FIN-40014, Jyväskylä, Finland
Accepted: 10 December 2006
Published online: 18 January 2007
A new technique to produce isobarically pure ion beams for decay spectroscopy by using a gas-filled Penning trap was commissioned at the ion guide isotope separator on-line facility, IGISOL. β-decays of neutron-rich 100Zr, 102Zr and 104Zr isotopes were studied with this technique. In addition, the values of 100,102,104Zr β-decays were determined from the direct mass measurements of zirconium and niobium isotopes performed with a high-precision Penning trap. The mass of 104Nb was directly measured for the first time and the obtained mass excess value for the longer-living (1+) state is -71823±10 keV. For the ground states of 100Nb and 102Nb the obtained mass excess values were -79802±20 keV and -76309±10 keV, respectively. The observed distribution of the β strength supports a prolate deformation assignment for 100,102,104Zr isotopes.
PACS: 07.75.+h Mass spectrometers – / 21.10.Dr Nuclear structure: Binding energies and masses – / 27.60.+j 90 ⩽ A ⩽ 149 – / 23.40.-s β decay; double β decay; electron and muon capture –
© Società Italiana di Fisica and Springer-Verlag, 2007