|Message: Too many kaons punching through||Not Logged In (login)|
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I'm using a modification of the B4 example to study punchthrough (i.e. what is the particle spectrum out the back of an absorber for a given incoming particle type and energy). The setup is a big block of Pb (also studied W) with an incoming monoenergetic particle in the center of the block. I'm using 10.2.0 with the FTFP_BERT physics list (though I've tried many lists and it seems to not have a big effect).
We have done many checks to see if the numbers we get make sense compared with measurements. One number that seems very off to us is the number of kaon0Ls that get through the back, i.e. we shoot a kaon0L with energy E0 and then observe the number of kaon0L's with energy E1 coming out the back. Our absorber is 5 \lambda (about 90 mm for Pb). For E0 \gtrsim 10 GeV, I find that about 2% of the time, a kaon0L goes out the back with E1 = E0, i.e. it seems like it did not interact at all. I've tried dividing up the absorber into many pieces and I can confirm that it is going through without interacting. This number was measured in Phys. Rev. Lett. 42 (1979) 9 and should be more like 0.2%. Do I need to do something special for kaon0Ls?
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