Phys.Rev. C 94, 014307 (2016)

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

Identification of the J^π = 1^- state in ²¹⁸Ra populated via α decay of ²²²Th

RADIOACTIVITY ²²²Th(α)[from ²⁰⁸Pb(¹⁸O, 4n), E=95 MeV using RITU separator at Jyvaskyla accelerator facility]; measured Eγ, Iγ, Eα, Iα, x rays, αγ-coin, (recoil)α and (recoil)αα correlations, half-life of ²²²Th decay using two double-sided silicon-strip detectors (DSSDs) for particles and HPGe clover detectors for γ rays. ²¹⁸Ra; deduced levels, J, π, 1- state, α branching ratios, α hindrance factors. ²¹³Rn, ²¹⁹Ra, ²²¹Th(α); observed αγ-coin. Systematics of level energies and α hindrance factors for 1- and 3- states in ^218,220,222Rn, ^{218,220,222,224,226,228}Ra, ^{224,226,228,230,232}Th. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.94.014307