ANASEN_analysis/Armory/constant.h
2024-02-02 16:54:58 -05:00

106 lines
3.0 KiB
C++

/***********************************************************************
*
* This is constant.h, to provide various physical constants.
*
*-------------------------------------------------------
* created by Ryan (Tsz Leung) Tang, Nov-18, 2018
* email: goluckyryan@gmail.com
* ********************************************************************/
#ifndef constant
#define constant
#include <cmath>
const double pi = acos(-1.0);
const double E = 2.718281828459 ;
const double hbar_SI = 1.054571628e-34; //Js
const double kB = 1.3806504e-23; //JK^-1
const double e = 1.602176487e-19; //C
const double c_SI = 299792458; //ms^-1
const double me_SI = 9.10938215e-31 ; //kg
const double mp_SI = 1.672621637e-27 ; //kg
const double mn_SI = 1.67492729e-27 ; //kg
const double NA = 6.022141e+23 ; //mol^-1
const double deg2rad = pi/180 ;
const double rad2deg = 180/pi ;
//======================================================================
const double amu = 931.49432; // MeV/c^2
const double hbarc = 197.326979; // MeV fm;
const double c = 299.792458; // mm/ns;
const double ee = 1.439964454; // MeV.fm
//======================================================================
double kg2MeV(double m){
return m*c_SI*c_SI/e/1e6;
}
double T2Brho(double mass, int Z, int A, double T){
//mass in MeV
// Z in e
// T in MeV/A
double gamma = (T*A + mass)/mass;
double beta = sqrt(1-1/gamma/gamma);
return mass*beta*gamma/Z/c;
}
double Brho2T(double mass, int Z, int A, double Brho){
//mass in MeV
// Z in e
return (sqrt(pow(Brho*Z*c,2)+mass*mass)-mass)/A;
}
double T2beta(double mass, int A, double T){
double gamma = 1.0 + T*A/mass;
return sqrt(1-1/gamma/gamma);
}
double ev2nm(double eV){
// photon energy to nm
return hbarc/2/pi/eV;
}
//======================================================================
const double mp = kg2MeV(mp_SI);
const double mn = kg2MeV(mn_SI);
const double hbar = 197.326979;
//======================================================================
inline std::vector<std::string> SplitStr(std::string tempLine, std::string splitter, int shift = 0){
std::vector<std::string> output;
size_t pos;
do{
pos = tempLine.find(splitter); /// fine splitter
if( pos == 0 ){ ///check if it is splitter again
tempLine = tempLine.substr(pos+1);
continue;
}
std::string secStr;
if( pos == std::string::npos ){
secStr = tempLine;
}else{
secStr = tempLine.substr(0, pos+shift);
tempLine = tempLine.substr(pos+shift);
}
///check if secStr is begin with space
while( secStr.substr(0, 1) == " ") secStr = secStr.substr(1);
///check if secStr is end with space
while( secStr.back() == ' ') secStr = secStr.substr(0, secStr.size()-1);
output.push_back(secStr);
///printf(" |%s---\n", secStr.c_str());
}while(pos != std::string::npos );
return output;
}
#endif