G4EquilibriumEvaporator.cc

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//
// $Id: G4EquilibriumEvaporator.cc 71954 2013-06-29 04:40:40Z mkelsey $
//
// 20100114  M. Kelsey -- Remove G4CascadeMomentum, use G4LorentzVector directly
// 20100308  M. Kelsey -- Bug fix for setting masses of evaporating nuclei
// 20100319  M. Kelsey -- Use new generateWithRandomAngles for theta,phi stuff;
//              eliminate some unnecessary std::pow()
// 20100319  M. Kelsey -- Bug fix in new GetBindingEnergy() use right after
//              goodRemnant() -- Q1 should be outside call.
// 20100412  M. Kelsey -- Pass G4CollisionOutput by ref to ::collide()
// 20100413  M. Kelsey -- Pass buffers to paraMaker[Truncated]
// 20100419  M. Kelsey -- Handle fission output list via const-ref
// 20100517  M. Kelsey -- Use G4CascadeInterpolator for QFF
// 20100520  M. Kelsey -- Inherit from common base class, make other colliders
//              simple data members.  Rename timeToBigBang() to override
//              base explosion().
// 20100617  M. Kelsey -- Remove "RUN" preprocessor flag and all "#else" code,
//              pass verbosity to colliders.
// 20100620  M. Kelsey -- Use local "bindingEnergy()" function to call through.
// 20100701  M. Kelsey -- Don't need to add excitation to nuclear mass; compute
//              new excitation energies properly (mass differences)
// 20100702  M. Kelsey -- Simplify if-cascades, indentation
// 20100712  M. Kelsey -- Add conservation checking
// 20100714  M. Kelsey -- Move conservation checking to base class.  Use
//              _generated_ evaporate energy (S) to adjust EEXS directly,
//              and test for S < EEXS before any particle generation; shift
//              nucleus momentum (PEX) by evaporate momentum directly
// 20100719  M. Kelsey -- Remove duplicative EESX_new calculation.
// 20100923  M. Kelsey -- Migrate to integer A and Z
// 20110214  M. Kelsey -- Follow G4InuclParticle::Model enumerator migration
// 20110728  M. Kelsey -- Fix Coverity #22951: check for "icase = -1" after
//              loop which is supposed to set it.  Otherwise indexing is wrong.
// 20110801  M. Kelsey -- Move "parms" buffer to data member, allocate in
//              constructor.
// 20110809  M. Kelsey -- Move "foutput" to data member, get list by reference;
//              create final-state particles within "push_back" to avoid
//              creation of temporaries.
// 20110922  M. Kelsey -- Follow G4InuclParticle::print(ostream&) migration
// 20111007  M. Kelsey -- Add G4InuclParticleNames, replace hardcoded numbers
// 20120608  M. Kelsey -- Fix variable-name "shadowing" compiler warnings.
// 20121009  M. Kelsey -- Improve debugging output
// 20130129  M. Kelsey -- Move QF interpolation to global statics for
//              multi-threaded shared memory.
// 20130621  M. Kelsey -- Remove turning off conservation checks after fission
// 20130622  Inherit from G4CascadeDeexciteBase, move to deExcite() interface
//              with G4Fragment
// 20130628  Fissioner produces G4Fragment output directly in G4CollisionOutput
// 20130808  M. Kelsey -- Use new object-version of paraMaker, for thread safety
// 20130924  M. Kelsey -- Use G4Log, G4Exp for CPU speedup
// 20150608  M. Kelsey -- Label all while loops as terminating.
// 20150622  M. Kelsey -- For new G4cbrt(int), move powers of A outside.

#include "G4EquilibriumEvaporator.hh"
#include "G4SystemOfUnits.hh"
#include "G4BigBanger.hh"
#include "G4CascadeInterpolator.hh"
#include "G4CollisionOutput.hh"
#include "G4Fissioner.hh"
#include "G4Fragment.hh"
#include "G4InuclNuclei.hh"
#include "G4InuclSpecialFunctions.hh"
#include "G4InuclParticleNames.hh"
#include "G4LorentzConvertor.hh"
#include "G4LorentzVector.hh"
#include "G4ThreeVector.hh"
#include "G4Log.hh"
#include "G4Exp.hh"

using namespace G4InuclParticleNames;
using namespace G4InuclSpecialFunctions;

namespace {                     // Interpolation arrays for QF
  const G4double QFREP[72] = {  
    //     TL201 *     *   *    *
    //      1    2     3   4    5
    22.5, 22.0, 21.0, 21.0, 20.0,
    //     BI209 BI207 PO210 AT213 *    TH234
    //      6     7    8     9     10   11
    20.6, 20.6, 18.6, 15.8, 13.5, 6.5,
    //     TH233 TH232 TH231 TH230 TX229 PA233 PA232 PA231 PA230 U240
    //     12    13    14    15    16    17    18    19    20    21
    6.65, 6.22, 6.27, 6.5,  6.7,  6.2,  6.25, 5.9,  6.1,  5.75,
    //     U239 U238 U237  U236 U235 U234 U233 U232 U231
    //     22   23   24    25   26   27   28   29   30
    6.46, 5.7, 6.28, 5.8, 6.15, 5.6, 5.8, 5.2, 5.8,
    //     NP238 NP237 NP236 NP235 PU245 NP234  PU244 NP233
    //     31    32    33    34    35    36     37    38
    6.2 , 5.9 , 5.9,  6.0,  5.8,  5.7,   5.4,  5.4,
    //     PU242 PU241 PU240 PU239 PU238 AM247 PU236 AM245 AM244 AM243
    //     39    40    41    42    43    44    45    46    47    48
    5.6,  6.1,  5.57, 6.3,  5.5,  5.8,  4.7,  6.2,  6.4,  6.2,
    //     AM242 AM241 AM240 CM250 AM239 CM249 CM248 CM247 CM246
    //     49    50    51    52    53    54    55    56    57
    6.5,  6.2,  6.5,  5.3,  6.4,  5.7,  5.7,  6.2,  5.7,
    //     CM245 CM244 CM243 CM242 CM241 BK250 CM240
    //     58    59    60    61    62    63    64
    6.3,  5.8,  6.7,  5.8,  6.6,  6.1,  4.3,
    //     BK249 CF252 CF250 CF248 CF246 ES254 ES253 FM254
    //     65    66    67    68    69    70    71    72
    6.2,  3.8,  5.6,  4.0,  4.0,  4.2,  4.2,  3.5 };

  static const G4double XREP[72] = {
    //      1      2     3      4      5
    0.6761, 0.677, 0.6788, 0.6803, 0.685,
    //      6     7     8     9     10     11
    0.6889, 0.6914, 0.6991, 0.7068, 0.725, 0.7391,
    //     12  13    14   15   16    17  18    19    20    21
    0.74, 0.741, 0.742, 0.743, 0.744, 0.7509, 0.752, 0.7531, 0.7543, 0.7548,
    //     22    23    24
    0.7557, 0.7566, 0.7576,
    //      25     26   27    28    29   30   31    32     33    34
    0.7587, 0.7597, 0.7608, 0.762, 0.7632, 0.7644, 0.7675, 0.7686, 0.7697, 0.7709,
    //      35    36    37    38    39   40    41
    0.7714, 0.7721, 0.7723, 0.7733, 0.7743, 0.7753, 0.7764,
    //      42    43    44    45    46    47    48   49
    0.7775, 0.7786, 0.7801, 0.781, 0.7821, 0.7831, 0.7842, 0.7852,
    //     50     51    52    53    54    55    56    57    58
    0.7864, 0.7875, 0.7880, 0.7887, 0.7889, 0.7899, 0.7909, 0.7919, 0.7930,
    //      59    60    61    62    63    64
    0.7941, 0.7953, 0.7965, 0.7977, 0.7987, 0.7989,
    //      65    66    67    68    69    70    71    72
    0.7997, 0.8075, 0.8097, 0.8119, 0.8143, 0.8164, 0.8174, 0.8274 };
}


// Constructor and destructor

G4EquilibriumEvaporator::G4EquilibriumEvaporator()
  : G4CascadeDeexciteBase("G4EquilibriumEvaporator"),
    theParaMaker(verboseLevel), QFinterp(XREP) {
  parms.first.resize(6,0.);
  parms.second.resize(6,0.);
}

G4EquilibriumEvaporator::~G4EquilibriumEvaporator() {}

void G4EquilibriumEvaporator::setVerboseLevel(G4int verbose) {
  G4CascadeDeexciteBase::setVerboseLevel(verbose);
  theFissioner.setVerboseLevel(verbose);
  theBigBanger.setVerboseLevel(verbose);
}


// Main operation

void G4EquilibriumEvaporator::deExcite(const G4Fragment& target,
                                       G4CollisionOutput& output) {
  if (verboseLevel) {
    G4cout << " >>> G4EquilibriumEvaporator::deExcite" << G4endl;
  }

  if (verboseLevel>1) G4cout << " evaporating target: \n" << target << G4endl;

  // simple implementation of the equilibium evaporation a la Dostrowski
  const G4double huge_num = 50.0;
  const G4double small = -50.0;
  const G4double prob_cut_off = 1.0e-15;
  const G4double Q1[6] = { 0.0, 0.0, 2.23, 8.49, 7.72, 28.3 };
  const G4int AN[6] = { 1, 1, 2, 3, 3, 4 };
  const G4int Q[6] =  { 0, 1, 1, 1, 2, 2 };
  const G4double G[6] = { 2.0, 2.0, 6.0, 6.0, 6.0, 4.0 };
  const G4double BE = 0.0063;
  const G4double fisssion_cut = 1000.0;
  const G4double cut_off_energy = 0.1;

  const G4double BF = 0.0242;
  const G4int itry_max = 1000;
  const G4int itry_global_max = 1000;
  const G4double small_ekin = 1.0e-6;
  const G4int itry_gam_max = 100;

  G4double W[8], u[6], V[6], TM[6];
  G4int A1[6], Z1[6];

  getTargetData(target);
  if (verboseLevel > 3) G4cout << " after noeq: eexs " << EEXS << G4endl;

  G4InuclElementaryParticle dummy(small_ekin, proton);
  G4LorentzConvertor toTheNucleiSystemRestFrame;
  //*** toTheNucleiSystemRestFrame.setVerbose(verboseLevel);
  toTheNucleiSystemRestFrame.setBullet(dummy);

  G4LorentzVector ppout;
  
  // See if fragment should just be dispersed
  if (explosion(A, Z, EEXS)) {
    if (verboseLevel > 1) G4cout << " big bang in eql start " << G4endl;
    theBigBanger.deExcite(target, output);

    validateOutput(target, output);             // Check energy conservation
    return;
  }

  // If nucleus is in ground state, no evaporation
  if (EEXS < cut_off_energy) {
    if (verboseLevel > 1) G4cout << " no energy for evaporation" << G4endl;
    output.addRecoilFragment(target);

    validateOutput(target, output);             // Check energy conservation
    return;
  }

  // Initialize evaporation attempts
  G4double coul_coeff = (A >= 100.0) ? 1.4 : 1.2;
   
  G4LorentzVector pin = PEX;    // Save original target for testing
    
  G4bool try_again = true;  
  G4bool fission_open = true;
  G4int itry_global = 0;
    
  /* Loop checking 08.06.2015 MHK */
  while (try_again && itry_global < itry_global_max) {
    itry_global++;

    // Set rest frame of current (recoiling) nucleus
    toTheNucleiSystemRestFrame.setTarget(PEX);
    toTheNucleiSystemRestFrame.toTheTargetRestFrame();
      
    if (verboseLevel > 2) {
      G4double nuc_mass = G4InuclNuclei::getNucleiMass(A, Z, EEXS);
      G4cout << " A " << A << " Z " << Z << " mass " << nuc_mass
             << " EEXS " << EEXS << G4endl;
    }
      
    if (explosion(A, Z, EEXS)) {                        // big bang
      if (verboseLevel > 2) 
        G4cout << " big bang in eql step " << itry_global << G4endl;

      theBigBanger.deExcite(makeFragment(PEX,A,Z,EEXS), output);

      validateOutput(target, output);   // Check energy conservation
      return;   
    } 

    if (EEXS < cut_off_energy) {        // Evaporation not possible
      if (verboseLevel > 2)
        G4cout << " no energy for evaporation in eql step " << itry_global 
               << G4endl;

      try_again = false;
      break;
    }

    // Normal evaporation chain
    G4double E0 = getE0(A);
    G4double parlev = getPARLEVDEN(A, Z);
    G4double u1 = parlev * A;

    theParaMaker.getParams(Z, parms);
    const std::vector<G4double>& AK = parms.first;
    const std::vector<G4double>& CPA = parms.second;

    G4double DM0 = bindingEnergy(A,Z);
    G4int i(0);

    for (i = 0; i < 6; i++) {
      A1[i] = A - AN[i];
      Z1[i] = Z - Q[i];
      u[i] = parlev * A1[i];
      V[i] = 0.0;
      TM[i] = -0.1;

      if (goodRemnant(A1[i], Z1[i])) {
        G4double QB = DM0 - bindingEnergy(A1[i],Z1[i]) - Q1[i];
        V[i] = coul_coeff * Z * Q[i] * AK[i] / (1.0 + EEXS / E0) /
          (G4cbrt(A1[i]) + G4cbrt(AN[i]));
        TM[i] = EEXS - QB - V[i] * A / A1[i];
        if (verboseLevel > 3) {
          G4cout << " i=" << i << " : QB " << QB << " u " << u[i]
                 << " V " << V[i] << " TM " << TM[i] << G4endl;
        }
      }
    }
      
    G4double ue = 2.0 * std::sqrt(u1 * EEXS);
    G4double prob_sum = 0.0;

    W[0] = 0.0;
    if (TM[0] > cut_off_energy) {
      G4double AL = getAL(A);
      G4double A13 = G4cbrt(A1[0]);
      W[0] = BE * A13*A13 * G[0] * AL;
      G4double TM1 = 2.0 * std::sqrt(u[0] * TM[0]) - ue;

      if (TM1 > huge_num) TM1 = huge_num;
      else if (TM1 < small) TM1 = small;

      W[0] *= G4Exp(TM1);
      prob_sum += W[0];
    }
      
    for (i = 1; i < 6; i++) {
      W[i] = 0.0;
      if (TM[i] > cut_off_energy) {
        G4double A13 = G4cbrt(A1[i]);
        W[i] = BE * A13*A13 * G[i] * (1.0 + CPA[i]);
        G4double TM1 = 2.0 * std::sqrt(u[i] * TM[i]) - ue;

        if (TM1 > huge_num) TM1 = huge_num;
        else if (TM1 < small) TM1 = small;

        W[i] *= G4Exp(TM1);
        prob_sum += W[i];
      }
    }

    // fisson part
    W[6] = 0.0;
    if (A >= 100.0 && fission_open) {
      G4double X2 = Z * Z / A;
      G4double X1 = 1.0 - 2.0 * Z / A; 
      G4double X = 0.019316 * X2 / (1.0 - 1.79 * X1 * X1);
      G4double EF = EEXS - getQF(X, X2, A, Z, EEXS);
          
      if (EF > 0.0) {
        G4double AF = u1 * getAF(X, A, Z, EEXS);
        G4double TM1 = 2.0 * std::sqrt(AF * EF) - ue;

        if (TM1 > huge_num) TM1 = huge_num;
        else if (TM1 < small) TM1 = small;

        W[6] = BF * G4Exp(TM1);
        if (W[6] > fisssion_cut*W[0]) W[6] = fisssion_cut*W[0];              

        prob_sum += W[6];
      }
    } 

    // again time to decide what next
    if (verboseLevel > 2) {
      G4cout << " Evaporation probabilities: sum = " << prob_sum
             << "\n\t n " << W[0] << " p " << W[1] << " d " << W[2]
             << " He3 " << W[3] << "\n\t t " << W[4] << " alpha " << W[5]
             << " fission " << W[6] << G4endl;
    }

    G4int icase = -1;

    if (prob_sum < prob_cut_off) {              // photon emission chain
      G4double UCR0 = 2.5 + 150.0 / A;
      G4double T00 = 1.0 / (std::sqrt(u1 / UCR0) - 1.25 / UCR0);

      if (verboseLevel > 3)
        G4cout << " UCR0 " << UCR0 << " T00 " << T00 << G4endl;

      G4int itry_gam = 0;
      while (EEXS > cut_off_energy && try_again) {
        itry_gam++;
        G4int itry = 0;
        G4double T04 = 4.0 * T00;
        G4double FMAX;

        if (T04 < EEXS) {
          FMAX = (T04*T04*T04*T04) * G4Exp((EEXS - T04) / T00);
        } else {
          FMAX = EEXS*EEXS*EEXS*EEXS;
        }; 

        if (verboseLevel > 3)
          G4cout << " T04 " << T04 << " FMAX (EEXS^4) " << FMAX << G4endl;

        G4double S(0), X1(0);
        while (itry < itry_max) {
          itry++;
          S = EEXS * inuclRndm();
          X1 = (S*S*S*S) * G4Exp((EEXS - S) / T00);

          if (X1 > FMAX * inuclRndm()) break;
        };

        if (itry == itry_max) {         // Maximum attempts exceeded
          try_again = false;
          break;
        }

        if (verboseLevel > 2) G4cout << " photon escape ?" << G4endl;

        if (S < EEXS) {         // Valid evaporate
          S /= GeV;                             // Convert to Bertini units

          G4double pmod = S;
          G4LorentzVector mom = generateWithRandomAngles(pmod, 0.);

          // Push evaporated particle into current rest frame
          mom = toTheNucleiSystemRestFrame.backToTheLab(mom);

          if (verboseLevel > 3) {
            G4cout << " nucleus   px " << PEX.px() << " py " << PEX.py()
                   << " pz " << PEX.pz() << " E " << PEX.e() << G4endl
                   << " evaporate px " << mom.px() << " py " << mom.py()
                   << " pz " << mom.pz() << " E " << mom.e() << G4endl;
          }

          PEX -= mom;                   // Remaining four-momentum
          EEXS -= S*GeV;                // New excitation energy (in MeV)

          // NOTE:  In-situ construction will be optimized away (no copying)
          output.addOutgoingParticle(G4InuclElementaryParticle(mom, photon,
                                     G4InuclParticle::Equilib));
          
          if (verboseLevel > 3)
            G4cout << output.getOutgoingParticles().back() << G4endl;
          
          ppout += mom;
        } else {
          if (itry_gam == itry_gam_max) try_again = false;
        }
      }         // while (EEXS > cut_off
      try_again = false;
    } else {                    // if (prob_sum < prob_cut_off)
      G4double SL = prob_sum * inuclRndm();
      if (verboseLevel > 3) G4cout << " random SL " << SL << G4endl;

      G4double S1 = 0.0;
      for (i = 0; i < 7; i++) { // Select evaporation scenario
        S1 += W[i];
        if (SL <= S1) {
          icase = i;
          break;
        };
      };

      if (icase < 0) continue;  // Failed to choose scenario, try again

      if (icase < 6) { // particle or light nuclei escape
        if (verboseLevel > 2) {
          G4cout << " particle/light-ion escape ("
                 << (icase==0 ? "neutron" : icase==1 ? "proton" :
                     icase==2 ? "deuteron" : icase==3 ? "He3" :
                     icase==4 ? "triton" : icase==5 ? "alpha" : "ERROR!")
                 << ")?" << G4endl;
        }

        G4double uc = 2.0 * std::sqrt(u[icase] * TM[icase]);
        G4double ur = (uc > huge_num ? G4Exp(huge_num) : G4Exp(uc));
        G4double d1 = 1.0 / ur;
        G4double d2 = 1.0 / (ur - 1.0);     
        G4int itry1 = 0;
        G4bool bad = true;

        while (itry1 < itry_max && bad) {
          itry1++; 
          G4int itry = 0;
          G4double EPR = -1.0;
          G4double S = 0.0;

          while (itry < itry_max && EPR < 0.0) {
            itry++;
            G4double uu = uc + G4Log((1.0 - d1) * inuclRndm() + d2);
            S = 0.5 * (uc * uc - uu * uu) / u[icase];
            EPR = TM[icase] - S * A / (A - 1.0) + V[icase];
          }; 

          if (verboseLevel > 3) {
            G4cout << " EPR " << EPR << " V " << V[icase]
                   << " S " << S << " EEXS " << EEXS << G4endl;
          }

          if (EPR > 0.0 && S > V[icase] && S < EEXS) {  // real escape
            if (verboseLevel > 2)
              G4cout << " escape itry1 " << itry1 << " icase "
                     << icase << " S (MeV) " << S << G4endl;

            S /= GeV;                           // Convert to Bertini units

            if (icase < 2) {    // particle escape
              G4int ptype = 2 - icase;
              if (verboseLevel > 2)
                G4cout << " particle " << ptype << " escape" << G4endl;
              
              // generate particle momentum
              G4double mass =
                G4InuclElementaryParticle::getParticleMass(ptype);
              
              G4double pmod = std::sqrt((2.0 * mass + S) * S);
              G4LorentzVector mom = generateWithRandomAngles(pmod, mass);
              
              // Push evaporated particle into current rest frame
              mom = toTheNucleiSystemRestFrame.backToTheLab(mom);
              
              if (verboseLevel > 2) {
                G4cout << " nucleus   px " << PEX.px() << " py " << PEX.py()
                       << " pz " << PEX.pz() << " E " << PEX.e() << G4endl
                       << " evaporate px " << mom.px() << " py " << mom.py()
                       << " pz " << mom.pz() << " E " << mom.e() << G4endl;
              }
              
              // New excitation energy depends on residual nuclear state
              G4double mass_new =
                G4InuclNuclei::getNucleiMass(A1[icase],Z1[icase]);
              
              G4double EEXS_new = ((PEX-mom).m() - mass_new)*GeV;
              if (EEXS_new < 0.0) continue;     // Sanity check for new nucleus
              
              PEX -= mom;               // Remaining four-momentum
              EEXS = EEXS_new;
              
              A = A1[icase];
              Z = Z1[icase];          
              
              // NOTE:  In-situ construction optimizes away (no copying)
              output.addOutgoingParticle(G4InuclElementaryParticle(mom,
                                         ptype, G4InuclParticle::Equilib));
              
              if (verboseLevel > 3)
                G4cout << output.getOutgoingParticles().back() << G4endl;
              
              ppout += mom;
              bad = false;
            } else {    // if (icase < 2)
              if (verboseLevel > 2) {
                G4cout << " nucleus A " << AN[icase] << " Z " << Q[icase]
                       << " escape icase " << icase << G4endl;
              }
              
              G4double mass =
                G4InuclNuclei::getNucleiMass(AN[icase],Q[icase]);
              
              // generate particle momentum
              G4double pmod = std::sqrt((2.0 * mass + S) * S);
              G4LorentzVector mom = generateWithRandomAngles(pmod,mass);
              
              // Push evaporated particle into current rest frame
              mom = toTheNucleiSystemRestFrame.backToTheLab(mom);
              
              if (verboseLevel > 2) {
                G4cout << " nucleus   px " << PEX.px() << " py " << PEX.py()
                       << " pz " << PEX.pz() << " E " << PEX.e() << G4endl
                       << " evaporate px " << mom.px() << " py " << mom.py()
                       << " pz " << mom.pz() << " E " << mom.e() << G4endl;
              }
              
              // New excitation energy depends on residual nuclear state
              G4double mass_new =
                G4InuclNuclei::getNucleiMass(A1[icase],Z1[icase]);
              
              G4double EEXS_new = ((PEX-mom).m() - mass_new)*GeV;
              if (EEXS_new < 0.0) continue;     // Sanity check for new nucleus
              
              PEX -= mom;               // Remaining four-momentum
              EEXS = EEXS_new;
              
              A = A1[icase];
              Z = Z1[icase];
              
              // NOTE:  In-situ constructor optimizes away (no copying)
              output.addOutgoingNucleus(G4InuclNuclei(mom,
                                        AN[icase], Q[icase], 0.*GeV, 
                                        G4InuclParticle::Equilib));
              
              if (verboseLevel > 3) 
                G4cout << output.getOutgoingNuclei().back() << G4endl;
              
              ppout += mom;
              bad = false;
            }           // if (icase < 2)
          }             // if (EPR > 0.0 ...
        }               // while (itry1 ...

        if (itry1 == itry_max || bad) try_again = false;
      } else {  // if (icase < 6)
        if (verboseLevel > 2) {
          G4cout << " fission: A " << A << " Z " << Z << " eexs " << EEXS
                 << " Wn " << W[0] << " Wf " << W[6] << G4endl;
        }

        // Catch fission output separately for verification
        fission_output.reset();
        theFissioner.deExcite(makeFragment(A,Z,EEXS), fission_output);

        if (fission_output.numberOfFragments() == 2) {          // fission ok
          if (verboseLevel > 2) G4cout << " fission done in eql" << G4endl;

          // Move fission fragments to lab frame for processing
          fission_output.boostToLabFrame(toTheNucleiSystemRestFrame);

          // Now evaporate the fission fragments individually
          this->deExcite(fission_output.getRecoilFragment(0), output);
          this->deExcite(fission_output.getRecoilFragment(1), output);

          validateOutput(target, output);       // Check energy conservation
          return;
        } else { // fission forbidden now
          fission_open = false;
        }
      }         // End of fission case
    }           // if (prob_sum < prob_cut_off)
  }             // while (try_again

  // this time it's final nuclei

  if (itry_global == itry_global_max) {
    if (verboseLevel > 3) {
      G4cout << " ! itry_global " << itry_global_max << G4endl;
    }
  }

  G4LorentzVector pnuc = pin - ppout;

  // NOTE:  In-situ constructor will be optimized away (no copying)
  output.addOutgoingNucleus(G4InuclNuclei(pnuc, A, Z, 0.,
                                          G4InuclParticle::Equilib));

  if (verboseLevel > 3) {
    G4cout << " remaining nucleus \n" << output.getOutgoingNuclei().back()
           << G4endl;
  }


  validateOutput(target, output);               // Check energy conservation
  return;
}                    

G4bool G4EquilibriumEvaporator::explosion(G4int a, 
                                          G4int z, 
                                          G4double e) const {
  if (verboseLevel > 3) {
    G4cout << " >>> G4EquilibriumEvaporator::explosion? ";
  }

  const G4double be_cut = 3.0;

  // Different criteria from base class, since nucleus more "agitated"
  G4bool bigb = (!(a >= 12 && z >= 0 && z < 3*(a-z)) &&
                 (e >= be_cut * bindingEnergy(a,z))
                 );

  if (verboseLevel > 3) G4cout << bigb << G4endl;

  return bigb;
}

G4bool G4EquilibriumEvaporator::goodRemnant(G4int a, 
                                            G4int z) const {
  if (verboseLevel > 3) {
    G4cout << " >>> G4EquilibriumEvaporator::goodRemnant(" << a << "," << z
           << ")? " << (a>1 && z>0 && a>z) << G4endl;
  }

  return a > 1 && z > 0 && a > z;
}

G4double G4EquilibriumEvaporator::getQF(G4double x, 
                                        G4double x2, 
                                        G4int a,
                                        G4int /*z*/, 
                                        G4double ) const {
  if (verboseLevel > 3) {
    G4cout << " >>> G4EquilibriumEvaporator::getQF ";
  }
  
  const G4double G0 = 20.4;
  const G4double XMIN = 0.6761;
  const G4double XMAX = 0.8274;

  G4double QFF = 0.0;

  if (x < XMIN || x > XMAX) {
    G4double X1 = 1.0 - 0.02 * x2;
    G4double FX = (0.73 + (3.33 * X1 - 0.66) * X1) * (X1*X1*X1);
    G4double A13 = G4cbrt(a);
    QFF = G0 * FX * A13*A13;
  } else {
    QFF = QFinterp.interpolate(x, QFREP);
  }

  if (QFF < 0.0) QFF = 0.0;

  if (verboseLevel>3) G4cout << " returns " << QFF << G4endl;

  return QFF; 
}

G4double G4EquilibriumEvaporator::getAF(G4double , 
                                        G4int /*a*/, 
                                        G4int /*z*/, 
                                        G4double e) const {

  if (verboseLevel > 3) {
    G4cout << " >>> G4EquilibriumEvaporator::getAF" << G4endl;
  }

  // ugly parameterisation to fit the experimental fission cs for Hg - Bi nuclei
  G4double AF = 1.285 * (1.0 - e / 1100.0);

  if(AF < 1.06) AF = 1.06;
  // if(AF < 1.08) AF = 1.08;

  return AF;
}       

G4double G4EquilibriumEvaporator::getPARLEVDEN(G4int /*a*/, 
                                               G4int /*z*/) const {

  if (verboseLevel > 3) {
    G4cout << " >>> G4EquilibriumEvaporator::getPARLEVDEN" << G4endl;
  }

  const G4double par = 0.125;

  return par;
}

G4double G4EquilibriumEvaporator::getE0(G4int /*a*/) const {

  if (verboseLevel > 3) {
    G4cout << " >>> G4EquilibriumEvaporator::getE0" << G4endl;
  }

  const G4double e0 = 200.0;   

  return e0;   
}