Phys.Rev. C 100, 044323 (2019)

E.Parr, J.F.Smith, P.T.Greenlees, K.Auranen, P.A.Butler, R.Chapman, D.M.Cox, D.M.Cullen, L.P.Gaffney, T.Grahn, E.T.Gregor, L.Grocutt, A.Herzan, R.-D.Herzberg, D.Hodge, U.Jakobsson, R.Julin, S.Juutinen, J.Keatings, J.Konki, M.Leino, P.P.McKee, C.McPeake, D.Mengoni, A.K.Mistry, K.F.Mulholland, B.S.Nara Singh, G.G.O'Neill, J.Pakarinen, P.Papadakis, J.Partanen, P.Peura, P.Rahkila, P.Ruotsalainen, M.Sandzelius, J.Saren, M.Scheck, C.Scholey, M.Siciliano, M.Smolen, J.Sorri, P.Spagnoletti, K.M.Spohr, S.Stolze, M.J.Taylor, J.Uusitalo

α-decay spectroscopy of the N=130 isotones ²¹⁸Ra and ²²⁰Th: Mitigation of α-particle energy summing with implanted nuclei

RADIOACTIVITY ²¹⁸Ra(α)[from α-decay of ²²²Th formed in ²⁰⁸Pb(¹⁸O, 4n), E=95 MeV]; ²¹⁴Rn(α)[from α-decay of ²¹⁸Ra]; ²²⁰Th(α)[from α-decay of ²²⁴U formed in ²⁰⁸Pb(²⁰Ne, 4n), E=109 MeV]; ²¹⁶Ra(α)[from α-decay of ²²⁰Th]; measured recoiling evaporation residues using RITU gas-filled recoil separator, Eα, Iα, Eγ, Iγ, αγ-coin, half-lives of decays of ²¹⁸Ra, ²¹⁴Rn, ²²⁰Th and ²¹⁶Ra, α-branching ratio for decay to the g.s. and the first 2+ level in ²¹⁴Rn using the GREAT spectrometer at Jyvaskyla accelerator facility; data analyzed using a newly developed technique to mitigate energy summing due to sequential short-lived α decays from nuclei implanted into a silicon detector. ²¹⁴Rn; deduced 2+ level, α-hindrance factor. Comparison with previous experimental data.

doi: 10.1103/PhysRevC.100.044323