Abstract
Isomeric states in 128In and 130In have been studied with the JYFLTRAP Penning trap at the IGISOL facility. By employing state-of-the-art ion manipulation techniques, three different beta-decaying states in 128In and 130In have been separated and their masses measured. JYFLTRAP was also used to select the ions of interest for identification at a post-trap decay spectroscopy station. A new beta-decaying high-spin isomer feeding the 15− isomer in 128Sn has been discovered in 128In at 1797.6(20) keV. Shell-model calculations employing a CD-Bonn potential re-normalized with the perturbative G-matrix approach suggest this new isomer to be a 16+ spin-trap isomer. In 130In, the lowest-lying (10−) isomeric state at 58.6(82) keV was resolved for the first time using the phase-imaging ion cyclotron resonance technique. The energy difference between the 10− and 1− states in 130In, stemming from parallel/antiparallel coupling of (π0g9/2−1)⊗(ν0h11/2−1), has been found to be around 200 keV lower than predicted by the shell model. Precise information on the energies of the excited states determined in this work is crucial for producing new improved effective interactions for the nuclear shell model description of nuclei near 132Sn.
Highlights
Title: Three beta-decaying states in 128In and 130In resolved for the first time using Penningtrap techniques
Isomeric states in 128In and 130In have been studied with the JYFLTRAP Penning trap at the Ion Guide Isotope Separator On-Line (IGISOL) facility
JYFLTRAP was used to select the ions of interest for identification at a post-trap decay spectroscopy station
Summary
To resolve the isomeric states from each other and from the ground state an additional purification step employing a Ramsey dipolar cleaning [31] pattern with two 5-ms excitation fringes, separated by either 40 ms (128Inm and 130In) or 90 ms (128In and 128Inm1) waiting time in between, was applied in the second trap. This was further followed by a cooling period in the first trap before the actual mass measurements in the second trap. This suggests that the lower-mass state was the (10−) level which has a simi-
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