Single-particle neutron states in 199Hg populated in the 200Hg(d,t) 199Hg reaction

Abstract

Single-particle states in 199Hg have been studied with the 200Hg(d,t)199Hg reaction using 22-MeV deuterons. The reaction products were momentum analyzed using a Q3D magnetic spectrograph, and a position-sensitive cathode-strip detector located at the focal plane recorded the particle spectra. Cross sections for the population of individual states up to approximately 3-MeV excitation energy were determined, and angular distributions have been constructed. In total, 93 levels were observed, including and 52 previously unobserved levels, and spin-parity assignments made for 16 previously established levels. The results were compared with large-scale shell-model calculations that reproduce well the spectroscopic strengths for levels at low excitation energy, and the trends in the cumulative strength to high excitation energy. ©2026 American Physical Society.