|Message: Re: NeutronHP and Oxygen-16||Not Logged In (login)|
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By nature of the neutron HP package it can work only with isotopes, it is not possible to define some average values of Z and A - clear list of isotopes is required.
Your choice is the contructor of G4Element with average atomic weight. In that case a natural composition of isotopes of oxigen is assumed inside the neutron HP package for the isotope selection.
Does it a good job or not you need to discuss with HP experts. This forum is not the best for this question and should be continued in the hadronic physics forum.