uc l - th / 9 60 10 16 v 1 1 2 Ja n 19 96 DELTA DECAY IN NUCLEAR MEDIUM
نویسندگان
چکیده
Proton-nucleus collisions, where the beam proton gets excited to the delta resonance and then decays to pπ + , either inside or outside the nuclear medium, are studied. Cross-sections for various kinematics for the (p,p ′ π +) reaction between 500 MeV and 1 GeV beam energy are calculated to see the effects of the nuclear medium on the propagation and decay of the resonance. The cross-sections studied include proton energy spectra in coincidence with the pion, four momentum transfer distributions, and the invariant pπ + mass distributions. We find that the effect of the nuclear medium on these cross-sections mainly reduces their magnitudes. Comparing these cross-sections with those considering the decay of the delta outside the nucleus only, we further find that at 500 MeV the two sets of cross-sections have large differences, while by 1 GeV the differences between them become much smaller.
منابع مشابه
l - th / 9 61 00 11 v 1 9 O ct 1 99 6 Submitted to Physical Review C YUM 96 - 23 SNUTP 96 - 106 Delta Decay in the Nuclear Medium
The ∆ decay in the nuclear medium is calculated in the relativistic mesonnucleon model. The delta spreading width is calculated and compared with the Pauli-blocked πN decay width. The influence of relativistic mean fields is also studied. We stress the importance of understanding the delta spreading width in interpreting experiments involving delta resonances.
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