Re: Using LOW_BIAS to discard Fissions from low energy (<20 MeV)

From: Alberto Fasso' <fasso_at_SLAC.Stanford.EDU>
Date: Fri, 15 Jul 2011 12:16:28 -0700 (PDT)

Dear Mina,

> I am including results from just one run, 1 Million primaries each for
> two separate runs: Run A: No LOW-BIAS card, Run B: With LOW-BIAS card
> (ECUT set at 20 MeV). I would have expected the LE-FISS SD to be zero
> for the run B. But we are getting 6.65228E-04 which is a small number.
> Should I be accepting this as consistent with zero?

My first answer was easy, but here I confess that I don't know.
Your questions sound reasonable to me. I hope that you can get answers by
somebody who knows better than me.

> Also, should we not be getting 0 secondaries created by low energy
> neutrons per beam particle (as reported in the output file as well) for
> Run B? [out of curiousity, shouldn't the sum of the particle type
> contributions add up to 100%?].

Reasonable again... I don't know. Perhaps, if you would send the input
file, I could look better into your problem.

> The reason we imposed the ECUT in LOW-BIAS card for neutrons is because
> we are interested in distinguishing low- and high-energy neutron
> contribution to residual nuclei yield. So, Run B, resnuclei yield
> results should be in principle lower than those from Run A since we have
> discarded low energy neutrons. I think we could accomplish this by
> setting Type (WHAT(1)) to 1 (Spallation) and to 2 (Low Energy) in the
> RESNUCLEi estimator. Am I right?

Yes, you are right.

Received on Sat Jul 16 2011 - 16:35:17 CEST

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