//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// $Id: G4StatMFParameters.cc,v 1.5 2008/07/25 11:20:47 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara


#include "G4StatMFParameters.hh"


const G4double G4StatMFParameters::_Kappa = 1.0; // dimensionless

const G4double G4StatMFParameters::_KappaCoulomb = 2.0; // dimensionless

const G4double G4StatMFParameters::_Epsilon0 = 16.0*MeV;

// Bethe-Weizsacker coefficients
const G4double G4StatMFParameters::_E0 = 16.0*MeV;

const G4double G4StatMFParameters::_Beta0 = 18.0*MeV;

const G4double G4StatMFParameters::_Gamma0 = 25.0*MeV;

// Critical temperature (for liquid-gas phase transitions)
const G4double G4StatMFParameters::_CriticalTemp = 18.0*MeV;

// Nuclear radius
const G4double G4StatMFParameters::_r0 = 1.17*fermi;

G4double G4StatMFParameters::Beta(const G4double T)
{
  if (T > _CriticalTemp) return 0.0;
  else {
    G4double CriticalTempSqr = _CriticalTemp*_CriticalTemp;
    G4double TempSqr = T*T;
    G4double tmp = (CriticalTempSqr-TempSqr)/(CriticalTempSqr+TempSqr);
		
    return _Beta0*tmp*std::pow(tmp,1.0/4.0);
  }
}

G4double G4StatMFParameters::DBetaDT(const G4double T) 
{
  if (T > _CriticalTemp) return 0.0;
  else {
    G4double CriticalTempSqr = _CriticalTemp*_CriticalTemp;
    G4double TempSqr = T*T;
    G4double tmp = (CriticalTempSqr-TempSqr)/(CriticalTempSqr+TempSqr);
		
    return -5.0*_Beta0*std::pow(tmp,1.0/4.0)*(CriticalTempSqr*T)/
      ((CriticalTempSqr+TempSqr)*(CriticalTempSqr+TempSqr));
  }
}

G4double G4StatMFParameters::GetMaxAverageMultiplicity(const G4int A)
{
  // Maximun average multiplicity: M_0 = 2.6 for A ~ 200 
  // and M_0 = 3.3 for A <= 110
  G4double MaxAverageMultiplicity = 2.6;
  if (A <= 110) MaxAverageMultiplicity = 3.3;
  return MaxAverageMultiplicity;
}

G4StatMFParameters G4StatMFParameters::theStatMFParameters;


G4StatMFParameters * G4StatMFParameters::GetAddress()
{ return &theStatMFParameters; }

