source: trunk/source/processes/hadronic/stopping/src/G4AntiProtonAnnihilationAtRest.cc@ 1330

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[819]1//
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19// * technical work of the GEANT4 collaboration. *
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24// ********************************************************************
25//
26// G4AntiProtonAnnihilationAtRest physics process
27// Larry Felawka (TRIUMF), April 1998
28//---------------------------------------------------------------------
29
30#include "G4AntiProtonAnnihilationAtRest.hh"
31#include "G4DynamicParticle.hh"
32#include "G4ParticleTypes.hh"
33#include "Randomize.hh"
[1055]34#include "G4HadronicProcessStore.hh"
[819]35#include <string.h>
36#include <cmath>
37#include <stdio.h>
38
39#define MAX_SECONDARIES 100
40
41// constructor
42
43G4AntiProtonAnnihilationAtRest::G4AntiProtonAnnihilationAtRest(const G4String& processName,
44 G4ProcessType aType ) :
45 G4VRestProcess (processName, aType), // initialization
46 massPionMinus(G4PionMinus::PionMinus()->GetPDGMass()/GeV),
47 massProton(G4Proton::Proton()->GetPDGMass()/GeV),
48 massPionZero(G4PionZero::PionZero()->GetPDGMass()/GeV),
49 massAntiProton(G4AntiProton::AntiProton()->GetPDGMass()/GeV),
50 massPionPlus(G4PionPlus::PionPlus()->GetPDGMass()/GeV),
51 massGamma(G4Gamma::Gamma()->GetPDGMass()/GeV),
52 pdefGamma(G4Gamma::Gamma()),
53 pdefPionPlus(G4PionPlus::PionPlus()),
54 pdefPionZero(G4PionZero::PionZero()),
55 pdefPionMinus(G4PionMinus::PionMinus()),
56 pdefProton(G4Proton::Proton()),
57 pdefAntiProton(G4AntiProton::AntiProton()),
58 pdefNeutron(G4Neutron::Neutron()),
59 pdefDeuteron(G4Deuteron::Deuteron()),
60 pdefTriton(G4Triton::Triton()),
61 pdefAlpha(G4Alpha::Alpha())
62{
63 if (verboseLevel>0) {
64 G4cout << GetProcessName() << " is created "<< G4endl;
65 }
[962]66 SetProcessSubType(fHadronAtRest);
[819]67 pv = new G4GHEKinematicsVector [MAX_SECONDARIES+1];
68 eve = new G4GHEKinematicsVector [MAX_SECONDARIES];
69 gkin = new G4GHEKinematicsVector [MAX_SECONDARIES];
70
[1055]71 G4HadronicProcessStore::Instance()->RegisterExtraProcess(this);
[819]72}
73
74// destructor
75
76G4AntiProtonAnnihilationAtRest::~G4AntiProtonAnnihilationAtRest()
77{
[1055]78 G4HadronicProcessStore::Instance()->DeRegisterExtraProcess(this);
[819]79 delete [] pv;
80 delete [] eve;
81 delete [] gkin;
82}
83
[1055]84void G4AntiProtonAnnihilationAtRest::PreparePhysicsTable(const G4ParticleDefinition& p)
85{
86 G4HadronicProcessStore::Instance()->RegisterParticleForExtraProcess(this, &p);
87}
88
89void G4AntiProtonAnnihilationAtRest::BuildPhysicsTable(const G4ParticleDefinition& p)
90{
91 G4HadronicProcessStore::Instance()->PrintInfo(&p);
92}
[819]93
94// methods.............................................................................
95
96G4bool G4AntiProtonAnnihilationAtRest::IsApplicable(
97 const G4ParticleDefinition& particle
98 )
99{
100 return ( &particle == pdefAntiProton );
101
102}
103
104// Warning - this method may be optimized away if made "inline"
105G4int G4AntiProtonAnnihilationAtRest::GetNumberOfSecondaries()
106{
107 return ( ngkine );
108
109}
110
111// Warning - this method may be optimized away if made "inline"
112G4GHEKinematicsVector* G4AntiProtonAnnihilationAtRest::GetSecondaryKinematics()
113{
114 return ( &gkin[0] );
115
116}
117
118G4double G4AntiProtonAnnihilationAtRest::AtRestGetPhysicalInteractionLength(
119 const G4Track& track,
120 G4ForceCondition* condition
121 )
122{
123 // beggining of tracking
124 ResetNumberOfInteractionLengthLeft();
125
126 // condition is set to "Not Forced"
127 *condition = NotForced;
128
129 // get mean life time
130 currentInteractionLength = GetMeanLifeTime(track, condition);
131
132 if ((currentInteractionLength <0.0) || (verboseLevel>2)){
133 G4cout << "G4AntiProtonAnnihilationAtRestProcess::AtRestGetPhysicalInteractionLength ";
134 G4cout << "[ " << GetProcessName() << "]" <<G4endl;
135 track.GetDynamicParticle()->DumpInfo();
136 G4cout << " in Material " << track.GetMaterial()->GetName() <<G4endl;
137 G4cout << "MeanLifeTime = " << currentInteractionLength/ns << "[ns]" <<G4endl;
138 }
139
140 return theNumberOfInteractionLengthLeft * currentInteractionLength;
141
142}
143
144G4VParticleChange* G4AntiProtonAnnihilationAtRest::AtRestDoIt(
145 const G4Track& track,
146 const G4Step&
147 )
148//
149// Handles AntiProtons at rest; a AntiProton can either create secondaries or
150// do nothing (in which case it should be sent back to decay-handling
151// section
152//
153{
154
155// Initialize ParticleChange
156// all members of G4VParticleChange are set to equal to
157// corresponding member in G4Track
158
159 aParticleChange.Initialize(track);
160
161// Store some global quantities that depend on current material and particle
162
163 globalTime = track.GetGlobalTime()/s;
164 G4Material * aMaterial = track.GetMaterial();
165 const G4int numberOfElements = aMaterial->GetNumberOfElements();
166 const G4ElementVector* theElementVector = aMaterial->GetElementVector();
167
168 const G4double* theAtomicNumberDensity = aMaterial->GetAtomicNumDensityVector();
169 G4double normalization = 0;
170 for ( G4int i1=0; i1 < numberOfElements; i1++ )
171 {
172 normalization += theAtomicNumberDensity[i1] ; // change when nucleon specific
173 // probabilities are included.
174 }
175 G4double runningSum= 0.;
176 G4double random = G4UniformRand()*normalization;
177 for ( G4int i2=0; i2 < numberOfElements; i2++ )
178 {
179 runningSum += theAtomicNumberDensity[i2]; // change when nucleon specific
180 // probabilities are included.
181 if (random<=runningSum)
182 {
183 targetCharge = G4double((*theElementVector)[i2]->GetZ());
184 targetAtomicMass = (*theElementVector)[i2]->GetN();
185 }
186 }
187 if (random>runningSum)
188 {
189 targetCharge = G4double((*theElementVector)[numberOfElements-1]->GetZ());
190 targetAtomicMass = (*theElementVector)[numberOfElements-1]->GetN();
191
192 }
193
194 if (verboseLevel>1) {
195 G4cout << "G4AntiProtonAnnihilationAtRest::AtRestDoIt is invoked " <<G4endl;
196 }
197
198 G4ParticleMomentum momentum;
199 G4float localtime;
200
201 G4ThreeVector position = track.GetPosition();
202
203 GenerateSecondaries(); // Generate secondaries
204
205 aParticleChange.SetNumberOfSecondaries( ngkine );
206
207 for ( G4int isec = 0; isec < ngkine; isec++ ) {
208 G4DynamicParticle* aNewParticle = new G4DynamicParticle;
209 aNewParticle->SetDefinition( gkin[isec].GetParticleDef() );
210 aNewParticle->SetMomentum( gkin[isec].GetMomentum() * GeV );
211
212 localtime = globalTime + gkin[isec].GetTOF();
213
214 G4Track* aNewTrack = new G4Track( aNewParticle, localtime*s, position );
215 aNewTrack->SetTouchableHandle(track.GetTouchableHandle());
216 aParticleChange.AddSecondary( aNewTrack );
217
218 }
219
220 aParticleChange.ProposeLocalEnergyDeposit( 0.0*GeV );
221
222 aParticleChange.ProposeTrackStatus(fStopAndKill); // Kill the incident AntiProton
223
224// clear InteractionLengthLeft
225
226 ResetNumberOfInteractionLengthLeft();
227
228 return &aParticleChange;
229
230}
231
232
233void G4AntiProtonAnnihilationAtRest::GenerateSecondaries()
234{
235 static G4int index;
236 static G4int l;
237 static G4int nopt;
238 static G4int i;
239 static G4ParticleDefinition* jnd;
240
241 for (i = 1; i <= MAX_SECONDARIES; ++i) {
242 pv[i].SetZero();
243 }
244
245 ngkine = 0; // number of generated secondary particles
246 ntot = 0;
247 result.SetZero();
248 result.SetMass( massAntiProton );
249 result.SetKineticEnergyAndUpdate( 0. );
250 result.SetTOF( 0. );
251 result.SetParticleDef( pdefAntiProton );
252
253 AntiProtonAnnihilation(&nopt);
254
255 // *** CHECK WHETHER THERE ARE NEW PARTICLES GENERATED ***
256 if (ntot != 0 || result.GetParticleDef() != pdefAntiProton) {
257 // *** CURRENT PARTICLE IS NOT THE SAME AS IN THE BEGINNING OR/AND ***
258 // *** ONE OR MORE SECONDARIES HAVE BEEN GENERATED ***
259
260 // --- INITIAL PARTICLE TYPE HAS BEEN CHANGED ==> PUT NEW TYPE ON ---
261 // --- THE GEANT TEMPORARY STACK ---
262
263 // --- PUT PARTICLE ON THE STACK ---
264 gkin[0] = result;
265 gkin[0].SetTOF( result.GetTOF() * 5e-11 );
266 ngkine = 1;
267
268 // --- ALL QUANTITIES ARE TAKEN FROM THE GHEISHA STACK WHERE THE ---
269 // --- CONVENTION IS THE FOLLOWING ---
270
271 // --- ONE OR MORE SECONDARIES HAVE BEEN GENERATED ---
272 for (l = 1; l <= ntot; ++l) {
273 index = l - 1;
274 jnd = eve[index].GetParticleDef();
275
276 // --- ADD PARTICLE TO THE STACK IF STACK NOT YET FULL ---
277 if (ngkine < MAX_SECONDARIES) {
278 gkin[ngkine] = eve[index];
279 gkin[ngkine].SetTOF( eve[index].GetTOF() * 5e-11 );
280 ++ngkine;
281 }
282 }
283 }
284 else {
285 // --- NO SECONDARIES GENERATED AND PARTICLE IS STILL THE SAME ---
286 // --- ==> COPY EVERYTHING BACK IN THE CURRENT GEANT STACK ---
287 ngkine = 0;
288 ntot = 0;
289 globalTime += result.GetTOF() * G4float(5e-11);
290 }
291
292 // --- LIMIT THE VALUE OF NGKINE IN CASE OF OVERFLOW ---
293 ngkine = G4int(std::min(ngkine,G4int(MAX_SECONDARIES)));
294
295} // GenerateSecondaries
296
297
298void G4AntiProtonAnnihilationAtRest::Poisso(G4float xav, G4int *iran)
299{
300 static G4int i;
301 static G4float r, p1, p2, p3;
302 static G4int mm;
303 static G4float rr, ran, rrr, ran1;
304
305 // *** GENERATION OF POISSON DISTRIBUTION ***
306 // *** NVE 16-MAR-1988 CERN GENEVA ***
307 // ORIGIN : H.FESEFELDT (27-OCT-1983)
308
309 // --- USE NORMAL DISTRIBUTION FOR <X> > 9.9 ---
310 if (xav > G4float(9.9)) {
311 // ** NORMAL DISTRIBUTION WITH SIGMA**2 = <X>
312 Normal(&ran1);
313 ran1 = xav + ran1 * std::sqrt(xav);
314 *iran = G4int(ran1);
315 if (*iran < 0) {
316 *iran = 0;
317 }
318 }
319 else {
320 mm = G4int(xav * G4float(5.));
321 *iran = 0;
322 if (mm > 0) {
323 r = std::exp(-G4double(xav));
324 ran1 = G4UniformRand();
325 if (ran1 > r) {
326 rr = r;
327 for (i = 1; i <= mm; ++i) {
328 ++(*iran);
329 if (i <= 5) {
330 rrr = std::pow(xav, G4float(i)) / NFac(i);
331 }
332 // ** STIRLING' S FORMULA FOR LARGE NUMBERS
333 if (i > 5) {
334 rrr = std::exp(i * std::log(xav) -
335 (i + G4float(.5)) * std::log(i * G4float(1.)) +
336 i - G4float(.9189385));
337 }
338 rr += r * rrr;
339 if (ran1 <= rr) {
340 break;
341 }
342 }
343 }
344 }
345 else {
346 // ** FOR VERY SMALL XAV TRY IRAN=1,2,3
347 p1 = xav * std::exp(-G4double(xav));
348 p2 = xav * p1 / G4float(2.);
349 p3 = xav * p2 / G4float(3.);
350 ran = G4UniformRand();
351 if (ran >= p3) {
352 if (ran >= p2) {
353 if (ran >= p1) {
354 *iran = 0;
355 }
356 else {
357 *iran = 1;
358 }
359 }
360 else {
361 *iran = 2;
362 }
363 }
364 else {
365 *iran = 3;
366 }
367 }
368 }
369
370} // Poisso
371
372
373G4int G4AntiProtonAnnihilationAtRest::NFac(G4int n)
374{
375 G4int ret_val;
376
377 static G4int i, m;
378
379 // *** NVE 16-MAR-1988 CERN GENEVA ***
380 // ORIGIN : H.FESEFELDT (27-OCT-1983)
381
382 ret_val = 1;
383 m = n;
384 if (m > 1) {
385 if (m > 10) {
386 m = 10;
387 }
388 for (i = 2; i <= m; ++i) {
389 ret_val *= i;
390 }
391 }
392 return ret_val;
393
394} // NFac
395
396
397void G4AntiProtonAnnihilationAtRest::Normal(G4float *ran)
398{
399 static G4int i;
400
401 // *** NVE 14-APR-1988 CERN GENEVA ***
402 // ORIGIN : H.FESEFELDT (27-OCT-1983)
403
404 *ran = G4float(-6.);
405 for (i = 1; i <= 12; ++i) {
406 *ran += G4UniformRand();
407 }
408
409} // Normal
410
411
412void G4AntiProtonAnnihilationAtRest::AntiProtonAnnihilation(G4int *nopt)
413{
414 static G4float brr[3] = { G4float(.125),G4float(.25),G4float(.5) };
415
416 G4float r__1;
417
418 static G4int i, ii, kk;
419 static G4int nt;
420 static G4float cfa, eka;
421 static G4int ika, nbl;
422 static G4float ran, pcm;
423 static G4int isw;
424 static G4float tex;
425 static G4ParticleDefinition* ipa1;
426 static G4float ran1, ran2, ekin, tkin;
427 static G4float targ;
428 static G4ParticleDefinition* inve;
429 static G4float ekin1, ekin2, black;
430 static G4float pnrat, rmnve1, rmnve2;
431 static G4float ek, en;
432
433 // *** ANTI PROTON ANNIHILATION AT REST ***
434 // *** NVE 04-MAR-1988 CERN GENEVA ***
435 // ORIGIN : H.FESEFELDT (09-JULY-1987)
436
437 // NOPT=0 NO ANNIHILATION
438 // NOPT=1 ANNIH.IN PI+ PI-
439 // NOPT=2 ANNIH.IN PI0 PI0
440 // NOPT=3 ANNIH.IN PI- PI0
441 // NOPT=4 ANNIH.IN GAMMA GAMMA
442
443 pv[1].SetZero();
444 pv[1].SetMass( massAntiProton );
445 pv[1].SetKineticEnergyAndUpdate( 0. );
446 pv[1].SetTOF( result.GetTOF() );
447 pv[1].SetParticleDef( result.GetParticleDef() );
448 isw = 1;
449 ran = G4UniformRand();
450 if (ran > brr[0]) {
451 isw = 2;
452 }
453 if (ran > brr[1]) {
454 isw = 3;
455 }
456 if (ran > brr[2]) {
457 isw = 4;
458 }
459 *nopt = isw;
460 // **
461 // ** EVAPORATION
462 // **
463 if (isw == 1) {
464 rmnve1 = massPionPlus;
465 rmnve2 = massPionMinus;
466 }
467 else if (isw == 2) {
468 rmnve1 = massPionZero;
469 rmnve2 = massPionZero;
470 }
471 else if (isw == 3) {
472 rmnve1 = massPionMinus;
473 rmnve2 = massPionZero;
474 }
475 else if (isw == 4) {
476 rmnve1 = massGamma;
477 rmnve2 = massGamma;
478 }
479 ek = massProton + massAntiProton - rmnve1 - rmnve2;
480 tkin = ExNu(ek);
481 ek -= tkin;
482 if (ek < G4float(1e-4)) {
483 ek = G4float(1e-4);
484 }
485 ek *= G4float(.5);
486 en = ek + (rmnve1 + rmnve2) * G4float(.5);
487 r__1 = en * en - rmnve1 * rmnve2;
488 pcm = r__1 > 0 ? std::sqrt(r__1) : 0;
489 pv[2].SetZero();
490 pv[2].SetMass( rmnve1 );
491 pv[3].SetZero();
492 pv[3].SetMass( rmnve2 );
493 if (isw > 3) {
494 pv[2].SetMass( 0. );
495 pv[3].SetMass( 0. );
496 }
497 pv[2].SetEnergyAndUpdate( std::sqrt(pv[2].GetMass()*pv[2].GetMass()+pcm*pcm) );
498 pv[2].SetTOF( result.GetTOF() );
499 pv[3].SetEnergy( std::sqrt(pv[3].GetMass()*pv[3].GetMass()+pcm*pcm) );
500 pv[3].SetMomentumAndUpdate( -pv[2].GetMomentum().x(), -pv[2].GetMomentum().y(), -pv[2].GetMomentum().z() );
501 pv[3].SetTOF( result.GetTOF() );
502 switch ((int)isw) {
503 case 1:
504 pv[2].SetParticleDef( pdefPionPlus );
505 pv[3].SetParticleDef( pdefPionMinus );
506 break;
507 case 2:
508 pv[2].SetParticleDef( pdefPionZero );
509 pv[3].SetParticleDef( pdefPionZero );
510 break;
511 case 3:
512 pv[2].SetParticleDef( pdefPionMinus );
513 pv[3].SetParticleDef( pdefPionZero );
514 break;
515 case 4:
516 pv[2].SetParticleDef( pdefGamma );
517 pv[3].SetParticleDef( pdefGamma );
518 break;
519 default:
520 break;
521 }
522 nt = 3;
523 if (targetAtomicMass >= G4float(1.5)) {
524 cfa = (targetAtomicMass - G4float(1.)) /
525 G4float(120.) * G4float(.025) *
526 std::exp(-G4double(targetAtomicMass - G4float(1.)) / G4float(120.));
527 targ = G4float(1.);
528 tex = evapEnergy1;
529 if (tex >= G4float(.001)) {
530 black = (targ * G4float(1.25) +
531 G4float(1.5)) * evapEnergy1 / (evapEnergy1 + evapEnergy3);
532 Poisso(black, &nbl);
533 if (G4float(G4int(targ) + nbl) > targetAtomicMass) {
534 nbl = G4int(targetAtomicMass - targ);
535 }
536 if (nt + nbl > (MAX_SECONDARIES - 2)) {
537 nbl = (MAX_SECONDARIES - 2) - nt;
538 }
539 if (nbl > 0) {
540 ekin = tex / nbl;
541 ekin2 = G4float(0.);
542 for (i = 1; i <= nbl; ++i) {
543 if (nt == (MAX_SECONDARIES - 2)) {
544 continue;
545 }
546 if (ekin2 > tex) {
547 break;
548 }
549 ran1 = G4UniformRand();
550 Normal(&ran2);
551 ekin1 = -G4double(ekin) * std::log(ran1) -
552 cfa * (ran2 * G4float(.5) + G4float(1.));
553 if (ekin1 < G4float(0.)) {
554 ekin1 = std::log(ran1) * G4float(-.01);
555 }
556 ekin1 *= G4float(1.);
557 ekin2 += ekin1;
558 if (ekin2 > tex) {
559 ekin1 = tex - (ekin2 - ekin1);
560 }
561 if (ekin1 < G4float(0.)) {
562 ekin1 = G4float(.001);
563 }
564 ipa1 = pdefNeutron;
565 pnrat = G4float(1.) - targetCharge / targetAtomicMass;
566 if (G4UniformRand() > pnrat) {
567 ipa1 = pdefProton;
568 }
569 ++nt;
570 pv[nt].SetZero();
571 pv[nt].SetMass( ipa1->GetPDGMass()/GeV );
572 pv[nt].SetKineticEnergyAndUpdate( ekin1 );
573 pv[nt].SetTOF( result.GetTOF() );
574 pv[nt].SetParticleDef( ipa1 );
575 }
576 if (targetAtomicMass >= G4float(230.) && ek <= G4float(2.)) {
577 ii = nt + 1;
578 kk = 0;
579 eka = ek;
580 if (eka > G4float(1.)) {
581 eka *= eka;
582 }
583 if (eka < G4float(.1)) {
584 eka = G4float(.1);
585 }
586 ika = G4int(G4float(3.6) / eka);
587 for (i = 1; i <= nt; ++i) {
588 --ii;
589 if (pv[ii].GetParticleDef() != pdefProton) {
590 continue;
591 }
592 ipa1 = pdefNeutron;
593 pv[ii].SetMass( ipa1->GetPDGMass()/GeV );
594 pv[ii].SetParticleDef( ipa1 );
595 ++kk;
596 if (kk > ika) {
597 break;
598 }
599 }
600 }
601 }
602 }
603 // **
604 // ** THEN ALSO DEUTERONS, TRITONS AND ALPHAS
605 // **
606 tex = evapEnergy3;
607 if (tex >= G4float(.001)) {
608 black = (targ * G4float(1.25) + G4float(1.5)) * evapEnergy3 /
609 (evapEnergy1 + evapEnergy3);
610 Poisso(black, &nbl);
611 if (nt + nbl > (MAX_SECONDARIES - 2)) {
612 nbl = (MAX_SECONDARIES - 2) - nt;
613 }
614 if (nbl > 0) {
615 ekin = tex / nbl;
616 ekin2 = G4float(0.);
617 for (i = 1; i <= nbl; ++i) {
618 if (nt == (MAX_SECONDARIES - 2)) {
619 continue;
620 }
621 if (ekin2 > tex) {
622 break;
623 }
624 ran1 = G4UniformRand();
625 Normal(&ran2);
626 ekin1 = -G4double(ekin) * std::log(ran1) -
627 cfa * (ran2 * G4float(.5) + G4float(1.));
628 if (ekin1 < G4float(0.)) {
629 ekin1 = std::log(ran1) * G4float(-.01);
630 }
631 ekin1 *= G4float(1.);
632 ekin2 += ekin1;
633 if (ekin2 > tex) {
634 ekin1 = tex - (ekin2 - ekin1);
635 }
636 if (ekin1 < G4float(0.)) {
637 ekin1 = G4float(.001);
638 }
639 ran = G4UniformRand();
640 inve = pdefDeuteron;
641 if (ran > G4float(.6)) {
642 inve = pdefTriton;
643 }
644 if (ran > G4float(.9)) {
645 inve = pdefAlpha;
646 }
647 ++nt;
648 pv[nt].SetZero();
649 pv[nt].SetMass( inve->GetPDGMass()/GeV );
650 pv[nt].SetKineticEnergyAndUpdate( ekin1 );
651 pv[nt].SetTOF( result.GetTOF() );
652 pv[nt].SetParticleDef( inve );
653 }
654 }
655 }
656 }
657 result = pv[2];
658 if (nt == 2) {
659 return;
660 }
661 for (i = 3; i <= nt; ++i) {
662 if (ntot >= MAX_SECONDARIES) {
663 return;
664 }
665 eve[ntot++] = pv[i];
666 }
667
668} // AntiProtonAnnihilation
669
670
671G4double G4AntiProtonAnnihilationAtRest::ExNu(G4float ek1)
672{
673 G4float ret_val, r__1;
674
675 static G4float cfa, gfa, ran1, ran2, ekin1, atno3;
676 static G4int magic;
677 static G4float fpdiv;
678
679 // *** NUCLEAR EVAPORATION AS FUNCTION OF ATOMIC NUMBER ATNO ***
680 // *** AND KINETIC ENERGY EKIN OF PRIMARY PARTICLE ***
681 // *** NVE 04-MAR-1988 CERN GENEVA ***
682 // ORIGIN : H.FESEFELDT (10-DEC-1986)
683
684 ret_val = G4float(0.);
685 if (targetAtomicMass >= G4float(1.5)) {
686 magic = 0;
687 if (G4int(targetCharge + G4float(.1)) == 82) {
688 magic = 1;
689 }
690 ekin1 = ek1;
691 if (ekin1 < G4float(.1)) {
692 ekin1 = G4float(.1);
693 }
694 if (ekin1 > G4float(4.)) {
695 ekin1 = G4float(4.);
696 }
697 // ** 0.35 VALUE AT 1 GEV
698 // ** 0.05 VALUE AT 0.1 GEV
699 cfa = G4float(.13043478260869565);
700 cfa = cfa * std::log(ekin1) + G4float(.35);
701 if (cfa < G4float(.15)) {
702 cfa = G4float(.15);
703 }
704 ret_val = cfa * G4float(7.716) * std::exp(-G4double(cfa));
705 atno3 = targetAtomicMass;
706 if (atno3 > G4float(120.)) {
707 atno3 = G4float(120.);
708 }
709 cfa = (atno3 - G4float(1.)) /
710 G4float(120.) * std::exp(-G4double(atno3 - G4float(1.)) / G4float(120.));
711 ret_val *= cfa;
712 r__1 = ekin1;
713 fpdiv = G4float(1.) - r__1 * r__1 * G4float(.25);
714 if (fpdiv < G4float(.5)) {
715 fpdiv = G4float(.5);
716 }
717 gfa = (targetAtomicMass - G4float(1.)) /
718 G4float(70.) * G4float(2.) *
719 std::exp(-G4double(targetAtomicMass - G4float(1.)) / G4float(70.));
720 evapEnergy1 = ret_val * fpdiv;
721 evapEnergy3 = ret_val - evapEnergy1;
722 Normal(&ran1);
723 Normal(&ran2);
724 if (magic == 1) {
725 ran1 = G4float(0.);
726 ran2 = G4float(0.);
727 }
728 evapEnergy1 *= ran1 * gfa + G4float(1.);
729 if (evapEnergy1 < G4float(0.)) {
730 evapEnergy1 = G4float(0.);
731 }
732 evapEnergy3 *= ran2 * gfa + G4float(1.);
733 if (evapEnergy3 < G4float(0.)) {
734 evapEnergy3 = G4float(0.);
735 }
736 while ((ret_val = evapEnergy1 + evapEnergy3) >= ek1) {
737 evapEnergy1 *= G4float(1.) - G4UniformRand() * G4float(.5);
738 evapEnergy3 *= G4float(1.) - G4UniformRand() * G4float(.5);
739 }
740 }
741 return ret_val;
742
743} // ExNu
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