Binding energies, charge radii, spins and moments: odd-odd Ag isotopes and discovery of a new isomer

Abstract

We report on the masses and hyperfine structure of ground and isomeric states in ${}^{114,116,118,120}$Ag isotopes, measured with the phase-imaging ion-cyclotron-resonance technique (PI-ICR) with the JYFLTRAP mass spectrometer and the collinear laser spectroscopy beamline at the Ion Guide Isotope Separator On-Line (IGISOL) facility, Jyväskylä, Finland. We measured the masses and excitation energies, electromagnetic moments, and charge radii, and firmly established the nuclear spins of the long-lived states. A new isomer was discovered in ${}^{118}$Ag and the half-lives of ${}^{118}$Ag long-lived states were reevaluated. We unambiguously pinned down the level ordering of all long-lived states, placing the inversion of the $I=0^{-}$ and $I=4^{+}$ states at $A=118$ $(N=71)$. Lastly, we compared the electromagnetic moments of each state to empirical single-particle moments to identify the dominant configuration where possible.

arXiv comment11 pages paper (excl. references) + 3 pages of supplementary material

References in corpus (21)

• Evolution of shell structure in exotic nuclei
• Laser Spectroscopy for the Study of Exotic Nuclei
• A sextupole ion beam guide to improve the efficiency and beam quality at IGISOL
• Spins, Electromagnetic Moments, and Isomers of 107-129Cd
• Precision Mass Measurements beyond ${}^{132}$Sn: Anomalous behaviour of odd-even staggering of binding energies
• Precision Mass Measurements of 129-131Cd and Their Impact on Stellar Nucleosynthesis via the Rapid Neutron Capture Process
• Preparing isomerically pure beams of short-lived nuclei at JYFLTRAP
• Table of hyperfine anomaly in atomic systems
• Mass measurements of 99-101In challenge ab initio nuclear theory of the nuclide 100Sn
• Isomeric states close to doubly magic ${}^{132}$Sn studied with JYFLTRAP
• First glimpse of the $N=82$ shell closure below $Z=50$ from masses of neutron-rich cadmium isotopes and isomers
• In-gas-cell laser ionization spectroscopy in the vicinity of 100Sn: Magnetic moments and mean-square charge radii of N=50-54 Ag
• A new off-line ion source facility at IGISOL
• Novel Penning-trap techniques reveal isomeric states in ${}^{128}$In and ${}^{130}$In for the first time
• Electromagnetic Properties of Indium Isotopes Elucidate the Doubly Magic Character of ${}^{100}$Sn
• High-precision mass measurements of neutron deficient silver isotopes probe the robustness of the $N$ = 50 shell closure
• Isomeric excitation energy for ${}^{99}$In${}^m$ from mass spectrometry reveals constant trend next to doubly magic ${}^{100}$Sn
• High-precision Penning-trap mass measurements of Cd and In isotopes at JYFLTRAP remove the fluctuations in the two-neutron separation energies
• High-precision measurements of low-lying isomeric states in ${}^{120-124}$In with JYFLTRAP double Penning trap
• Magnetic moment of Ag-104(m) and the hyperfine magnetic field of Ag in Fe using nuclear magnetic resonance on oriented nuclei
• Isomeric states of fission fragments explored via Penning trap mass spectrometry at IGISOL