Multiple-ionization energy difference of 163Ho and 163Dy atoms

TL;DR

This paper calculates the multiple-ionization energy differences of 163Ho and 163Dy atoms using advanced relativistic methods, aiming to improve neutrino mass measurements.

Contribution

It provides highly accurate theoretical ionization energy differences for Ho and Dy, incorporating QED and nuclear effects, aiding neutrino mass experiments.

Findings

Ionization energy differences within 1 eV uncertainty

Enhanced accuracy for neutrino mass limit measurements

Supports experimental efforts in electron capture studies

Abstract

The multiple-ionization energy difference of 163Ho and 163Dy atoms is evaluated for the ionization degree q = 30, 48, 56. The calculations are performed by means of the large-scale relativistic configuration interaction method combined with the many-body perturbation theory. The quantum electrodynamics, nuclear recoil, and frequency-dependent Breit interaction corrections are taken into account. The obtained theoretical values are within 1 eV uncertainty. These results can help to increase accuracy of the laboratory neutrino mass limit, provided they are accompanied by the corresponding experiment on electron capture in Ho and a precise measurement of the ion mass difference.