Phys.Rev. C55, R2755 (1997)

I.Ahmad, S.M.Austin, B.B.Back, R.R.Betts, F.P.Calaprice, K.C.Chan, A.A.Chishti, C.Conner, R.W.Dunford, J.D.Fox, S.J.Freedman, M.Freer, J.S.Greenberg, S.B.Gazes, A.L.Hallin, T.Happ, D.Henderson, N.I.Kaloskamis, E.Kashy, W.Kutschera, J.Last, C.J.Lister, M.Liu, M.R.Maier, D.J.Mercer, D.Mikolas, P.A.A.Perera, M.D.Rhein, D.E.Roa, J.P.Schiffer, T.A.Trainor, P.Wilt, J.S.Winfield, M.Wolanski, F.L.H.Wolfs, A.H.Wuosmaa, G.Xu, A.Young, J.E.Yurkon, and the APEX Collaboration

Internal Pair Conversion in Heavy Nuclei

NUCLEAR REACTIONS ²⁰⁶Pb(²⁰⁶Pb, X), E=5.90 MeV/nucleon; measured e⁺e^--sum energy spectra, Doppler corrected Eγ; deduced internal pair conversion to gamma branching ratio. ²³²Th(²⁰⁸Pb, X), E=5.80 MeV/nucleon; ²³⁸U(²⁰⁸Pb, X), E=5.80 MeV/nucleon; ¹⁸¹Ta(²³⁸U, X), E=5.95 MeV/nucleon; ²³²Th(²³⁸U, X), E=5.90 MeV/nucleon; measured e⁺e^--sum energy, Doppler corrected Eγ; deduced no discrete lines evidence in e⁺e^- spectra. ²³⁸U deduced new levels evidence.

doi: 10.1103/PhysRevC.55.R2755