Low-Lying Excited Levels in ²⁰⁰Hg

Abstract

Low-lying excited levels in ²⁰⁰Hg were investigated with a Ge(Li) gamma-ray spectrometer and with an internal conversion coefficient spectrometer. The spin and parity 2⁺ of the 1028.7-keV third excited level were confirmed, based on the internal conversion coefficient and K/L ratio of the transition from this level to the first excited 2⁺ state. Several new lines were found. A revised decay scheme was proposed. The experimental results showed that the nuclear structure of this nucleus can be understood fairly well with a model of two-proton holes coupled to harmonic surface vibrations.