CERN Accelerating science

Experiments at CERN
Title	Mass measurement of the self-conjugate 98In for nuclear and astrophysical studies
Author(s)	Nies, L ; Giesel, P F
Experiment	IS661
Greybook	See IS661 experiment
Approved	16 September 2020
Status	Preparation
Collaboration	ISOLDE
Accelerator	CERN ISOLDE
Abstract	We propose to use the ISOLTRAP high-precision online mass spectrometer to perform mass measurements of neutron-deficient $\textit{Z}$ = 49 indium isotopes. These masses will be used to study the evolution of nuclear structure in the immediate vicinity of the doubly magic $^{100}$Sn nuclide. In addition, their impact on the composition of astrophysical X-ray burst ashes will be assessed. In a recent experimental campaign, preliminary measurements of neutron-deficient indium isotopes of mass numbers down to $\textit{A}$ = 99 in their ground and/or excited states have been performed with ISOLTRAP. We aim at extending this work by refining our measurement of $^{99}$In, where a low-lying isomer of unknown excitation energy is expected but is yet to be experimentally observed. Pushing one neutron below $\textit{N}$ = 50, we furthermore aim to perform the first precision measurement of the mass of the $\textit{N}$ = $\textit{Z}$ = 49 self-conjugate $^{98}$In nuclide, which, apart from its importance for nuclear structure and astrophysics, is a strong case of interest for weak interaction studies by nuclear beta decay.

Contact: Mougeot, M J A