FLUKA: FLUKA questions

[Baerbel Naumann <B.Naumann@fz-rossendorf.de>]

Dear FLUKA users and FLUKA authors,

I have 2 questions concerning the use of the FLUKA code :

1)
I want to check the implementation of special nuclear reactions
inside the FLUKA code during the tracking. For instance, I want
to know the cross section of the 181Ta(gamma,2n) reaction at
photon energies between 15 and 22 MeV. How can I do it in an 
effective way ? Can I use the USRYIELD option and which parameters 
I have to give in this case ?

2)
Is there a possibility to stop the tracking of particles inside
the code ? This would be good for optimization of the CPU-time,
if I want to simulate the particle flux inside a small detector, 
which is in a distance of some meters from the target.

Many thanks in advance, regards

Baerbel
-- 
 Bärbel Naumann                         Tel.   +49 351 260-3132
 Technische Universität Dresden         Fax.   +49 351 260-3700
 Institut für Kern- und Teilchenphysik  B.Naumann@fz-rossendorf.de 
 01062 Dresden