Pion emission in 2H, 12C, 27Al() reactions at threshold

Abstract

The very first data from MAX-lab in Lund, Sweden on pion photoproduction at threshold energies are presented. The decrease of the total π + yield in γ + 12 C, 27 Al reactions below 200 MeV as well as the dσ/dΩ cross-section data essentially follow the predictions of an intranuclear-cascade model with an attractive potential for the pion-nucleus interaction. However, d 2 σ/dΩdT, cross-section data at 176 MeV show deviations which call for refinements of the model and possibly also for the inclusion of coherent pion-production mechanisms.

Nuclear photoproduction of vector mesons within a Monte Carlo approach

“…Some of the oldest and best known codes for intranuclear cascade and/or nuclear evaporation are Bertini's model [19], the ISABEL intranuclear cascade (INC) [20,21], and the codes developed by Barashenkov and collaborators [22][23][24][25]. There are many versions of these codes reflecting improvements along time, and many interesting results have been obtained [13,[26][27][28][29][30][31][32][33][34]. However, these codes consider the intranuclear cascade as a sequence of individual particle events along their tracks within the unphysical hypothesis that all the other particles inside the nucleus may be treated as static objects.…”

Nuclear physics program at MAX-lab

“…Chiral Perturbation Theory. Three different detector systems are used, a set of dE-E scintillators [14] , range telescopes [15] , and a Sistrip dE-CsI(Tl) E telescope [16] . The Ge6 [17] detector set-up has been tested in combination with Si-strip detectors.…”