Phys.Rev. C 106, 024310 (2022)

D.A.Nesterenko, K.Blaum, P.Delahaye, S.Eliseev, T.Eronen, P.Filianin, Z.Ge, M.Hukkanen, A.Kankainen, Yu.N.Novikov, A.V.Popov, A.Raggio, M.Stryjczyk, V.Virtanen

Direct determination of the excitation energy of the quasistable isomer ^180mTa

ATOMIC MASSES ^180,180mTa; measured cyclotron frequency with the phase-imaging ion-cyclotron-resonance (PI-ICR) technique using Penning-trap mass spectrometer (JYFLTRAP) at the Ion Guide Isotope Separator On-Line (IGISOL) facility of University of Jyvaskyla; deduced mass excesses, first direct precise determination of the excitation energy of naturally-occurring low-energy isomer of ¹⁸⁰Ta. ^180,180m produced in Ta(p, X), E=40 MeV reaction. Comparison with AME2020 evaluation. Relevance to search for dark matter, astrophysics, and development of a γ laser.

doi: 10.1103/PhysRevC.106.024310