Message: No low-energy resonances in beryllium photo-nuclear cross section? Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

Question No low-energy resonances in beryllium photo-nuclear cross section?  

Keywords: Be beryllium photoneutron photo-neutron cross section neutron G4PhotoNuclearCrossSection giant dipole resonance
Forum: Hadronic Processes
Date: 15 Jan, 2008
From: Patrick Saull <patrick.saull@nrc-cnrc.gc.ca>

Hello,

I've been using LHEP_PRECO_HP to simulate the production of neutrons from 
electron beams below 20 MeV interacting in various targets (via the 
photo-nuclear interaction), for comparison to experimental data and other 
MC packages. From what I can gather, the cross section for different 
materials is calculated in G4PhotoNuclearCrossSection::GetCrossSection(),
based on the parameters of the giant dipole resonance. This is fine for 
interactions where this broad resonance (which peaks well beyond 20 
MeV) dominates, but for beryllium there are additional (and prominent) 
very low energy resonances in the 2 MeV to 4 MeV region which are not 
(and cannot be) described by the parameters of this resonance. As a 
result, the production of neutrons for Be targets is well below 
expectation: one order of magnitude low at 20 MeV, and two orders at 
10 MeV. Is there any plan to include these resonances in the 
cross-section calculation in the near future, or should I try to 
implement something in the code to account for the missing resonances 
myself? Many thanks.

Cheers,
Pat 

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 More: Re: No low-energy resonances in beryllium photo-nuclear cross section?   (Patrick Saull - 05 Feb, 2008)
 Add Message Add Message
to: "No low-energy resonances in beryllium photo-nuclear cross section? "

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]