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Question Angular distribution of E1, M1, E2 transitions 

Forum: Hadronic Processes
Date: 27 Apr, 2009
From: Michael <Michael>

Hi,

I'm currently looking at the energy distribution of neutron induced gammas in several different materials. My simulation consists of a low energy neutron source, a target material and a sensitive detector region. I want to know what the gamma spectrum will look like in the sensitive detector from several different locations. I have implemented all the relevant ineleastic, elestic and capture hadronic classes. Running the simulation and obtaining data is fine but I am unsure whether G4 takes into account the emission angular dependence of the excited states in the materials? Is the emission effectively a 4pi flat averaged distribution or is there sin^2theta and cos^2theta dependence?

The emission spectrum in angular space depends on the multipolarity of the transition, and thus, the spin of the initial and final states. I briefly read through the physics ref manual and it says that these parameters are included when calculating the probability of emission but nothing is mentioned about the emission direction. Can anyone enlighten me?!

Many thanks and I look forward to a response.

Mike

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