Changes between Version 17 and Version 18 of perWeight

Timestamp:

Sep 9, 2019, 8:27:23 PM (5 years ago)

Author:

mosel

Comment:

--

perWeight

@@ -5 +5 @@
 (following text is taken - slightly modified - from: O.Buss, PhD thesis, [http://www.uni-giessen.de/fbz/fb07/fachgebiete/physik/institute/theorie/inst/theses/dissertation/buss_diss/view pdf], Appendix B.1) 
 
-Reactions which are so violent that they disassemble the whole target nucleus can be treated only by explicitly propagating all particles, the ones in the target and the ones produced in the collision on the same footing.
+Reactions which are so violent that they disassemble the whole target nucleus can be treated only by explicitly propagating all particles, the ones in the target and the ones produced in the collision, on the same footing.
 
-For reactions which are not violent enough to disrupt the whole target nucleus, e.g. low-energy πA, γA or neutrino A collisions at not too high energies, the  target nucleus stays very close to its ground state. Henceforth, one keeps as an approximation
-the phase-space density of the target nucleus constant in time ('frozen approximation'). In GiBUU this is controlled by the switch `freezeRealParticles`. The test-particles which represent this constant target nucleus are called ''real'' test-particles. However, one also wants to consider the final state particles. Thus one defines another type of test-particles which are called ''perturbative''.
-The ''perturbative'' test-particles are propagated and may collide with ''real'' ones, the products are
-''perturbative'' particles again. However, ''perturbative'' particles may not scatter among each other.
+For reactions which are not violent enough to disrupt the whole target nucleus, e.g. low-energy πA, γA or neutrino A collisions at not too high energies, the  target nucleus stays very close to its ground state. In this case, one keeps as an approximation
+the phase-space density of the target nucleons constant in time ('frozen approximation'). In GiBUU this is controlled by the switch `freezeRealParticles`. The test-particles which represent this constant target nucleus are called ''real'' test-particles. However, one also wants to consider the final state particles. Thus one defines another type of test-particles which are called ''perturbative''.
+The ''perturbative'' test-particles are produced in a reaction on one of the target nucleons. They are then propagated and may collide with other ''real'' ones in the target. The products of such collisions are
+''perturbative'' particles again. These ''perturbative'' particles can thus react with ''real'' target nucleons, but may not scatter among themselves.
 Furthermore, their feedback on the actual densities is neglected. One can simulate in
-this fashion the effects of the almost constant target on the outgoing pparticles without modifying
+this fashion the effects of the almost constant target on the outgoing particles without modifying
 the target. E.g. in πA collisions we initialize all initial state pions as ''perturbative'' test-particles.
 Thus the target automatically remains frozen and all products of the collisions of pions and