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Question Radioactive Decay of Be8 

Forum: Hadronic Processes
Date: 29 Apr, 2013
From: Joel Long <Joel Long>

In modeling a detector, two of the reactions I am looking for is:

Be9 (n,2n) Be8 -> 2alpha Be9 (n,alpha) He6

I am using the HP neutron data, and have verified that the cross-sections for both reactions are correct.

The problem is that I am not seeing any Be8 produced, based on a check in a user stepping action (even though it should be the dominant inelastic product in the ~14 MeV range I am interested in), and I have not been able to verify that the associated alphas are showing up either. When I went to check the radioactive decay data, the file for Be8 looks like this:

***Begin File***

#   8BE (6.8 eV)
#  Excitation   Halflife Mode       Daughter Ex  Intensity           Q
# File sanitized by Vanderbilt Decay-o-matic
# $Id:,v 1.20 2006/04/24 14:53:36 marcus Exp $ 
# Fri Oct  6 15:26:18 2006 
P 0.0000 9.6790e-17

***End File***

There is a header line, but no evidence of any decay routes. The readme for the radioactive decay data does not explain what a header with no listed decay paths indicates.

Can someone verify whether Be8 -> 2alpha is handled by the code in some way I haven't found, and perhaps the best way to check that this reaction is happening? All the useful SetVerbose() functions I have found are fairly inaccessible without building a completely custom physics list.

Thanks for your help, everyone!


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1 None: Re: Radioactive Decay of Be8   (michel maire - 30 Apr, 2013)
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