High-precision measurements of low-lying isomeric states in In120–124 with the JYFLTRAP double Penning trap

Abstract

High-precision measurements of low-lying isomeric states in 120-124In with the JYFLTRAP double Penning trap

High-precision Penning-trap mass measurements of Cd and In isotopes at JYFLTRAP remove the fluctuations in the two-neutron separation energies

“…In this work, the mass-excess value of the 118 In first isomeric state was determined directly for the first time and it is 107 (50) keV lower than the NUBASE20 extrapolation [39] while that of the second isomeric state is 108 (50) keV lower. It should be noted that the firstisomer mass excess, = −87236.8 (16) keV, is in agreement with the literature value for the ground-state mass excess, lit. = −87228 (8) keV [4].…”

“…3. A comparison of (a) two-neutron separation energies S 2n and (b) two-neutron shell-gap energies δ 2n for the In isotopic chain between AME20 [4], the work by Nesterenko et al [16], where mass values of [120][121][122][123][124] In are reported, and the combined results from JYFLTRAP (this work and Nesterenko et al [16]). The close-up of the S 2n curve around N = 70 is plotted in the inset.…”

“…The close-up of the S 2n curve around N = 70 is plotted in the inset. by Nesterenko et al [16] as they were published after the AME20 evaluation cutoff date [4].…”

“…A comparison of the log( f t ) values for the A Cd(0 + gs ) −→ A In(1 + 1 ) decay calculated with the log( f t ) calculator [52] using the Q β and the half-lives T 1/2 values from AME20/NUBASE20 [4,39] with the results from JYFLTRAP (this work and Ref. [16]).…”

“…The masses of neutron-rich isotopes of [120][121][122][123][124][125][126][127][128][129][130][131][132] Cd and [120][121][122][123][124][125][126][127][128][129][130][131][132][133][134] In have been studied with ISOLTRAP at CERN [10][11][12], JYFLTRAP at the Ion Guide Isotope Separator On-Line (IGISOL) facility [13][14][15][16], Canadian Penning Trap (CPT) at Argonne National Laboratory [17,18], and TITAN at TRIUMF [19][20][21]. Nonetheless, the masses of the less exotic species are only known from transfer-reaction [22][23][24] and β-decay [25,26] studies.…”