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U. Leinberger, E. Berdermann, F. Heine, S. Heinz, O. Joeres, P. Kienle,
I. Koenig, W. Koenig, C. Kozhuharov, A. Schröter, H. Tsertos, C. Hofmann,
G. Soff:
First Energy and Angle differential Measurements of -pairs
emitted by Internal Pair Conversion of excited Heavy Nuclei,
preprint nucl-ex/9704007
E. Ditzel, J.M. Hoogduin, H. Backe, J. Baumann, F.W.N. de Boer, H. Bokemeyer,
M. Debowski, R. Ganz, J. Gerl, T. Happ, M. Kasper, J. van Klinken, T. Kröll,
R. Kulessa, I. Peter, P. Salabura, H. Schaffner, S. Schremmer, K. Vetter,
H.J. Wollersheim, H. Xie:
Absence of E0 transitions around 1.8 MeV after collisions of U
with Ta,
Z. Physik. A358, 11-14 (1997)
I. Ahmad, S.M. Austin, B.B. Back, R.R. Betts, F.P. Calaprice, K.C. Chan, A.
Chishti, P. Chowdhury, C. Conner, R.W. Dunford, J.D. Fox, S.J. Freedman,
M. Freer, 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, E. Roa, J.P. Schiffer, T.A. Trainor,
P. Wilt, J.S. Winfield, M. Wolanski, F.L.H. Wolfs, A.H. Wuosmaa,
A. Young, and J. E. Yurkon (APEX Collaboration):
The positron-electron peak puzzle: results from APEX,
Z. Physik A358, 235-6 (1997)
J.J. Griffin:
APEX: Positive Evidence for Sharp 800 keV Pairs from Heavy Ion
Collisions Near the Coulomb Barrier,
preprint U of Md.PP#97-080, sub. to Phys. Rev. C