Program Listing for File PhotoDisintegration.h

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#ifndef CRPROPA_PHOTODISINTEGRATION_H
#define CRPROPA_PHOTODISINTEGRATION_H

#include "crpropa/Module.h"
#include "crpropa/PhotonBackground.h"

#include <vector>
#include <map>

namespace crpropa {
class PhotoDisintegration: public Module {
private:
        ref_ptr<PhotonField> photonField;
        double limit; // fraction of mean free path for limiting the next step
        bool havePhotons;
        std::string interactionTag = "PD";

        struct Branch {
                int channel; // number of emitted (n, p, H2, H3, He3, He4)
                std::vector<double> branchingRatio; // branching ratio as function of nucleus Lorentz factor
        };

        struct PhotonEmission {
                double energy; // energy of emitted photon [J]
                std::vector<double> emissionProbability; // emission probability as function of nucleus Lorentz factor
        };

        std::vector<std::vector<double> > pdRate; // pdRate[Z * 31 + N] = total interaction rate
        std::vector<std::vector<Branch> > pdBranch; // pdTable[Z * 31 + N] = branching ratios
        mutable std::map<int, std::vector<PhotonEmission> > pdPhoton; // map of emitted photon energies and photon emission probabilities

        static const double lgmin; // minimum log10(Lorentz-factor)
        static const double lgmax; // maximum log10(Lorentz-factor)
        static const size_t nlg; // number of Lorentz-factor steps

public:
        PhotoDisintegration(ref_ptr<PhotonField> photonField, bool havePhotons = false, double limit = 0.1);

        // set the target photon field
        void setPhotonField(ref_ptr<PhotonField> photonField);

        // decide if secondary photons are added to the simulation
        void setHavePhotons(bool havePhotons);

        void setLimit(double limit);

        void setInteractionTag(std::string tag);
        std::string getInteractionTag() const;

        void initRate(std::string filename);
        void initBranching(std::string filename);
        void initPhotonEmission(std::string filename);

        void process(Candidate *candidate) const;
        void performInteraction(Candidate *candidate, int channel) const;

        double lossLength(int id, double gamma, double z = 0);
};

} // namespace crpropa

#endif // CRPROPA_PHOTODISINTEGRATION_H