Phys.Rev. C 105, L051302 (2022)

H.B.Yang, Z.G.Gan, Z.Y.Zhang, M.H.Huang, L.Ma, M.M.Zhang, C.X.Yuan, Y.F.Niu, C.L.Yang, Y.L.Tian, L.Guo, Y.S.Wang, J.G.Wang, H.B.Zhou, X.J.Wen, H.R.Yang, X.H.Zhou, Y.H.Zhang, W.X.Huang, Z.Liu, S.G.Zhou, Z.Z.Ren, H.S.Xu, V.K.Utyonkov, A.A.Voinov, Yu.S.Tsyganov, A.N.Polyakov, D.I.Solovyev

New isotope ²⁰⁷Th and odd-even staggering in α-decay energies for nuclei with Z > 82 and N < 126

RADIOACTIVITY ²⁰⁷Th(α)[from ¹⁷⁶Hf(³⁶Ar, 5n), E=197-199 MeV]; ²⁰⁸Th(α)[from ¹⁷⁶Hf(³⁶Ar, 4n), E=197-199 MeV]; ²⁰³Ra, ¹⁹⁹Rn, ¹⁹⁵Po(α)[from ²⁰⁷Th α-decay chain]; ²⁰⁴Ra, ²⁰⁰Rn, ¹⁹⁶Po(α)[from ²⁰⁸Th α-decay chain]; measured evaporation residues (ERs), Eα, and ER-α₁-α₂-α₃-α₄ correlated α-decay chain from the decays of ²⁰⁷Th and²⁰⁸Th. ^207,208Th; deduced α-decay T_1/2, production σ. Z=84-92, N=102-126; discussed systematics of experimental and theoretically calculated (by relativistic Hartree-Fock-Bogoliubov and large-scale shell-model approaches) odd-even staggering (OES) of Q(α), Q(proton) and Q(neutron). Position-sensitive silicon strip detectors (PSSDs), non-position sensitive Si detectors, and SHANS gas-filled recoil separator at the sector focusing cyclotron facility of HIRFL, Lanzhou.

doi: 10.1103/PhysRevC.105.L051302