TY  - JOUR
A1  - Stein, Eckart
A1  - Reinhardt, Joachim
A1  - Schäfer, Andreas
A1  - Greiner, Walter
T1  - Induced decay of composite JPC=1++ particles in atomic Coulomb fields
T2  - Physical review A
N2  - The electron-positron pairs observed in heavy-ion collisions at Gesellschaft für Schwerionen-forschung Darmstadt mbH have been interpreted as the decay products of yet unknown particles with masses around 1.8 MeV. The negative results of resonant Bhabha scattering experiments, however, do not support such an interpretation. Therefore we focus on a more complex decay scenario, where the e+e- lines result from a two-collision process. We discuss the induced decay of a metastable 1++ state into e+e- pairs. For most realizations of a 1++ state such a decay in leading order can only take place in the Coulomb field of a target atom. This fact has the attractive consequence that for such a state the Bhabha bounds are no longer valid. However, the absolute value of the e+e- production cross section turns out to be unacceptably small.
Y1  - 2006
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/2406
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-29934
UR  - http://link.aps.org/abstract/PRA/v50/p867
VL  - 50
IS  - 1
SP  - 867
EP  - 870
ER  -