Eur. Phys. J. A (2012) 48: 49
https://doi.org/10.1140/epja/i2012-12049-x

Review

Isomer and decay studies for the rp process at IGISOL

¹ Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
² Petersburg Nuclear Physics Institute, 188300, Gatchina, Russia
³ Dating Laboratory, University of Helsinki, Helsinki, P.O. Box 64, FI-00014, Finland
⁴ Gesellschaft für Schwerionenforschung mbH, Planckstrasse 1, D-64291, Darmstadt, Germany

^* e-mail: anu.k.kankainen@jyu.fi

Received: 31 January 2012
Accepted: 13 February 2012
Published online: 19 April 2012

Abstract

This article reviews the decay studies of neutron-deficient nuclei within the mass region performed at the Ion-Guide Isotope Separator On-Line (IGISOL) facility in the University of Jyväskylä over last 25 years. Development from He-jet measurements to on-line mass spectrometry, and eventually to atomic mass measurements and post-trap spectroscopy at IGISOL, has yielded studies of around 100 neutron-deficient nuclei over the years. The studies form a solid foundation to astrophysical rp -process path modelling. The focus is on isomers studied either via spectroscopy or via Penning-trap mass measurements. The review is complemented with recent results on the ground and isomeric states of ⁹⁰Tc . The excitation energy of the low-spin isomer in ⁹⁰Tc has been measured as keV with JYFLTRAP double Penning trap and the ground state of ⁹⁰Tc has been confirmed to be the (8⁺) state with a half-life of s. Finally, the mass-excess results for the spin-gap isomers ⁵³Co ^m and ⁹⁵Pd ^m and implications from the JYFLTRAP mass measurements for the (21⁺) isomer in ⁹⁴Ag are discussed.