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60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
#ifndef CONSTANTS_H
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#define CONSTANTS_H
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#include <limits>
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#include "catima/build_config.h"
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namespace catima {
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constexpr double Ezero = 1E-3; // lowest E to calculate, below taken as 0
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constexpr double logEmin = -3; // log of minimum energy
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constexpr double logEmax = 7.0; // log of max energy
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constexpr int max_datapoints = 500; // how many datapoints between logEmin and logEmax
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constexpr int max_storage_data = 60; // number of datapoints which can be stored in cache
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constexpr double numeric_epsilon = std::numeric_limits<double>::epsilon();
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/// required integration precision (relative units)
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/*
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constexpr double int_eps_range = 0.001;
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constexpr double int_eps_range_str = 0.001;
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constexpr double int_eps_ang_str = 0.01;
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constexpr double int_eps_tof = 0.01;
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*/
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constexpr double thin_target_limit = 1 - 1e-3;
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#ifdef REACTIONS
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constexpr double emin_reaction = 30.0;
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constexpr bool reactions = true;
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#else
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constexpr bool reactions = false;
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#endif
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constexpr double PI = 3.1415926535897932384626433832795;
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constexpr double Avogadro = 6.022140857; // 10^23
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constexpr double electron_mass = 0.510998928; // MeV/c^2
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constexpr double atomic_mass_unit = 931.4940954; // MeV/c^2
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constexpr double classical_electron_radius = 2.8179403227; //fm
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constexpr double fine_structure = 1/137.035999139;
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constexpr double fine_structure_inverted = 1/fine_structure;
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constexpr double c_light = 299.792458; //Mm/s
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constexpr double bohr_velocity = 2.19 / c_light; // in c unit
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constexpr double hbar = 6.582119514; // in eV*s * 10^-16
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constexpr double dedx_constant = 0.3070749187; //4*pi*Na*me*c^2*r_e^2 //MeV cm^2
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constexpr double domega2dx_constant = dedx_constant*electron_mass; //4*pi*Na*me*c^2*r_e^2 //MeV^2 cm^2
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// units //
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namespace units{
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constexpr double g = 1.0;
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constexpr double mg = 1000.0;
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constexpr double cm3 = 1.0;
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constexpr double cm = 1.0;
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constexpr double mm = 10.;
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constexpr double keV = 1000.0;
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constexpr double ns = 1.0;
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}
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}
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#endif
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