Unfolding code

Bonner spheres are widely used in neutron spectrometry.
Getting back the neutron energy distribution requires unfolding codes.
Many codes based on different approaches exist, e.g.

• UMG: Unfolding with MAXED (MAXimum Entropy Deconvolution) and GRAVEL (a program based on SAND, Spectrum Analysis by Neutron Detectors)
• MITOM (MIguel TOMà¡s unfolding code)
• FRUIT (FRascati Unfolding Interactive Tool)

Unfortunately, most of them are black boxes.
So I decided to write a plain open source one in order to deepen my understanding of unfolding.
It is written in Root/C++ and brings in the following features:

• Educated guess spectrum
  • combination of the analytical neutron components used in FRUIT (thermal, epithermal and fast)
  • seed parameters derived from the IAEA neutron spectra compendium
• Minimization performed by Minuit

The normalization in FRUIT is a bit tricky.
An explanation is given here (look for the string "logbook deconvolution").

Results obtained so far are very satisfying, being in good agreement with other codes.

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