https://doi.org/10.1140/epja/s10050-020-00153-5
Letter
Mass and half-life measurements of neutron-deficient iodine isotopes
1
II Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392, Gießen, Germany
2
GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
3
KVI-CART, University of Groningen, Groningen, The Netherlands
4
Tel Aviv University, 6997801, Tel Aviv, Israel
5
Soreq Nuclear Research Center, 81800, Yavne, Israel
6
IFIN-HH/ELI-NP, Măgurele, 077126, Bucharest, Romania
7
Saint Mary’s University, NS B3H 3C3, Halifax, Canada
8
University of Jyväskylä, 40014, Jyväskylä, Finland
9
TRIUMF, BC V6T 2A3, Vancouver, Canada
* e-mail: s.ayet@gsi.de
Received:
15
December
2019
Accepted:
29
April
2020
Published online:
19
May
2020
Neutron-deficient iodine isotopes, I and
I, were produced at relativistic energies by in-flight fragmentation at the Fragment Separator (FRS) at GSI. The FRS Ion Catcher was used to thermalize the ions and to perform highly accurate mass measurements with a Multiple-Reflection Time-of-Flight Mass-Spectrometer (MR-TOF-MS). The masses of both isotopes were measured directly for the first time. The half-life of the
I was measured by storing the ions in an RF quadrupole for different storage times and counting the remaining nuclei with the MR-TOF-MS. The measured half-life was used to assign the ground state to the measured
I ions. Predictions on the possible
-decay branch for
I are presented based on the reduced uncertainties obtained for the
-value. Systematic studies of the mass surface were performed with the newly obtained masses, showing better agreement with the expected trend in this mass region.
© The Author(s), 2020