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.
Highlights
Obtained from the masses, define which spontaneous decay modes are energetically possible
The nuclides 116I and 114I were produced at relativistic energies via projectile fragmentation at the Fragment Separator (FRS) at GSI [9] and delivered to the FRS Ion Catcher [10] where the ions were slowed down and thermalized in a gasfilled Cryogenic Stopping Cell (CSC) [11,12,13]
The reference ion used for the precision calibration and for the time resolved calibration (TRC) was the molecule 86Kr14N2 ( A = 114), which was formed in the CSC and ionized by the beam
Summary
The trend of observables derived from the masses along isotopic or isobaric chains, such as two-proton or twoneutron separation energies (S2p, S2n), can reveal information about nuclear structure [4,5,6]. In the α-decaying mid-shell region, the observable calculated from the masses as the double difference of the two-proton separation energy in the Z direction (d2Z [S2p(N , Z )], see Eq 1), shows some irregularities if the presently known and extrapolated mass values [7] are used. This indicates that inaccuracies may be present in the mass surface in this region. A study of the mass surface is presented via the observable d2Z [S2p(N , Z )] showing that the new mass values further refine and smooth the mass surface in this region
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