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On Thu, 26 Jan 2017 11:31:37 GMT, Giuseppe Vitucci wrote:
> I got a problem regarding the absorption percentage of thermal neutrons > (0.025 eV) launched towards a layer (0.01 cm) of natural boron. > > According to the Beer-Lambert law, after having properly designed the > neutron beam energy and the boron layer, I should get a percentage of > absorbed neutrons equal to 36% more or less, and I confirmed my > calculation looking elsewhere also (like here > https://www.ncnr.nist.gov/resources/activation/ ). > > The problem is that I always get the value of 13%, i tried simulating > 10000 neutrons and even more, but the result is stucked at that value. I > really don't know why. > > I am currently using QGSP_BERT_HP as physics list, but i tried several > others without success.
For thermal neutrons, are you doing all of the "non-default" things you need to do in your application? If you look starting at page 195 (10.03 edition) of the Application Developer's Guide, there are things you need to add to the physics list, and special element and material names you have to use (you cannot just use the "NIST materials").
-- Michael Kelsey
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