Mass and half-life measurements of neutron-deficient iodine isotopes

Samuel Ayet San Andrés; Ali Mollaebrahimi; Timo Dickel; Julian Bergmann; Jens Ebert; Hans Geissel; Florian Greiner; Emma Haettner; Christine Hornung; Nasser Kalantar-Nayestanaki; Ivan Miskun; Wolfgang R. Plaß; Sivaji Purushothaman; Ann-Kathrin Rink; Christoph Scheidenberger; Helmut Weick; Soumya Bagchi; Paul Constantin; Andrew Finlay; Satbir Kaur; Wayne Lippert; Israel Mardor; Bo Mei; Iain Moore; Jan-Hendrick Otto; Stephane Pietri; Ilkka Pohjalainen; Andrej Prochazka; Christophe Rappold; Moritz P. Reiter; Yoshiki K. Tanaka; John S. Winfield

doi:10.1140/epja/s10050-020-00153-5

2023 Impact factor 2.6

Hadrons and Nuclei

Open Access

Eur. Phys. J. A (2020) 56: 143
https://doi.org/10.1140/epja/s10050-020-00153-5

Letter

Mass and half-life measurements of neutron-deficient iodine isotopes

Samuel Ayet San Andrés¹^,2^*, Ali Mollaebrahimi¹^,3, Timo Dickel¹^,2, Julian Bergmann¹, Jens Ebert¹, Hans Geissel¹^,2, Florian Greiner¹, Emma Haettner², Christine Hornung¹, Nasser Kalantar-Nayestanaki³, Ivan Miskun¹, Wolfgang R. Plaß¹^,2, Sivaji Purushothaman², Ann-Kathrin Rink¹, Christoph Scheidenberger¹^,2, Helmut Weick², Soumya Bagchi¹^,2^,7, Paul Constantin⁶, Andrew Finlay⁹, Satbir Kaur⁷, Wayne Lippert¹, Israel Mardor⁴^,5, Bo Mei⁶, Iain Moore⁸, Jan-Hendrick Otto¹, Stephane Pietri², Ilkka Pohjalainen⁸, Andrej Prochazka², Christophe Rappold¹^,2, Moritz P. Reiter¹^,9, Yoshiki K. Tanaka², John S. Winfield² and for the Super-FRS Experiment Collaboration

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

Abstract

Neutron-deficient iodine isotopes, $^{116}$ I and $^{114}$ 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 $^{114}$ 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 $^{114}$ I ions. Predictions on the possible $\alpha$ -decay branch for $^{114}$ I are presented based on the reduced uncertainties obtained for the $Q_{\alpha }$ -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.