Seminar on Fission (Het Pand, Gent, Belgium, 17-20 May 2010)

CONTENTS......Page 14
Dedication......Page 6
Sponsors......Page 8
Organising and Scientific Advisory Committees......Page 10
Preface......Page 12
Topical Reviews......Page 18
1. Introduction......Page 20
2. Instruments and Methods......Page 21
3. Mass Distributions of Fission Fragments......Page 23
4. Charge Distributions of Fission Fragments......Page 24
5. Cold Fission......Page 31
6. Ternary Fission......Page 37
7. Fission Induced by Polarized Neutrons......Page 41
8. Fission Cross Sections......Page 43
9. Summary......Page 44
References......Page 45
1. Introduction......Page 48
2. The adiabatic release......Page 50
3. The sudden release......Page 51
4. The alpha-decay between saddle and scission......Page 52
5. Evaporation at scission......Page 53
7. The uncertainty principle......Page 54
9. Emission always perpendicular to the deformation axis......Page 55
References......Page 58
Characteristics of the Fission Process......Page 60
1. Introduction......Page 62
2. Hierarchy of the correlations in the mean-field based approaches......Page 63
3. Formalism......Page 65
4. Generalized overlap: preliminary results......Page 66
5. Conclusion......Page 67
References......Page 68
1. Introduction......Page 70
2. Elements of formalism......Page 71
3. Analysis of experiments......Page 76
4. Concluding remarks......Page 79
References......Page 80
1. Introduction......Page 82
2. Fission fragment evaporation model......Page 83
3. Average prompt  ssion neutron multiplicity......Page 84
4. Prompt neutron multiplicity distribution......Page 85
5. Prompt  ssion neutron spectrum......Page 86
7. Conclusion......Page 87
References......Page 88
1. Introduction......Page 90
2. Excitation energy sorting......Page 91
3. Neutron yields as a function of the fragment mass......Page 92
4. Even-odd e ect in fission fragment element yields......Page 93
5. Conclusions......Page 95
References......Page 96
1. Introduction......Page 98
2. Reminder on methods and concepts used in mass models......Page 99
3. Concept of a general fission model......Page 100
4. Formulation of the model......Page 101
5. Conclusions......Page 103
References......Page 104
1. Introduction......Page 106
2.1. The notion of temperature in nuclear physics......Page 107
2.3. Distributions for excitation energy and kinetic energy of fragments......Page 108
2.5. An empirical relationship for the nuclear temperature value......Page 110
3. Results and discussion......Page 111
References......Page 114
1.2. Digital and analogue processing......Page 116
2.2. Ionization chamber......Page 117
3.2. Pile-up correction......Page 118
3.3. FF analysis......Page 119
4.1. Angular distribution......Page 120
4.3. Mass distributions......Page 121
References......Page 122
Measurement of fragment mass yields in neutron-induced fission of Th and 238U at 33, 45 and 60 MeV V. D. Simutkin, S. Pomp, J. Blomgren, M. Österlund, P. Andersson, R. Bevilacqua, I. V. Ryzhov, G. A. Tutin, M. S. Onegin, L. A. Vaishnene, J. P. Meulders and R. Prieels......Page 124
3. Data processing and analysis......Page 125
4. Measurement results......Page 127
5. Conclusions......Page 129
References......Page 130
1. Introduction......Page 132
2.1. Analysis of specific energy losses......Page 133
2.2. Mass-energy-range correlation......Page 135
3. Conclusion......Page 138
References......Page 139
1. Introduction......Page 140
2. Experiment......Page 141
3. Treatment of Data......Page 142
4. Results and Discussion......Page 143
References......Page 145
2. Experimental results and analysis......Page 148
References......Page 151
1. Introduction......Page 152
2. The GEMINI++ and INCL4.5 models......Page 153
3.1. Modifications of the fission width......Page 154
3.2. Results......Page 155
Bibliography......Page 157
Ternary Fission......Page 160
Characteristics of light charged particle emission in the ternary fission of 250Cf and 252Cf at different excitation energies S. Vermote, C. Wagemans, O. Serot, J. Heyse, T. Soldner, P. Geltenbort, I. Almahamid, G. Tian and L. Rao......Page 162
2.1. Sample characteristics......Page 163
3.1. Particle identification......Page 164
3.2.2. Ternary fission......Page 165
4. Discussion......Page 167
5. Conclusion......Page 169
References......Page 170
1. Introduction......Page 172
2.1. Energy Correlations in Ternary Fission......Page 173
2.2. Intermediate 5He,7He and 8Li  LCPs and Yield Systematics of He Isotopes......Page 175
3. Correlation Experiments Performed at GSI and the ILL......Page 176
4. Ternary Fission as a Tool to Study Fission of Rotating Nuclei......Page 178
References......Page 179
Neutron Emission in Fission......Page 180
1. Introduction......Page 182
2. Data analysis and results......Page 183
3. Conclusions......Page 188
References......Page 189
2.1. Production of neutron beam at the WNR facility......Page 190
2.3. Prompt fission neutron detection with FIGARO......Page 191
3. Analysis......Page 192
4. Results......Page 193
5. Discussion......Page 194
6. Conclusion......Page 195
References......Page 196
Anisotropic neutron evaporation from spinning fission fragments L. Stuttgé, O. Dorvaux, F. Gönnenwein, M. Mutterer, Yu. Kopatch, E. Chernysheva, F. Hanappe and F.-J. Hambsch......Page 198
1. Neutron emission in the fission process......Page 199
2. Centre of mass anisotropy of neutron evaporation......Page 200
3. New experimental method to accede to the cms anisotropy......Page 201
4. CORA experiments......Page 203
References......Page 205
New Facilities and Detection Systems......Page 206
1. Introduction......Page 208
2. MYRRHA, a safe and flexible research facility......Page 210
2.2. Technology......Page 211
4. ISOL@MYRRHA: an exotic island......Page 213
References......Page 215
Next generation fission experiments at GSI: short and long term perspectives A. Bail, J. Taieb, A. Chatillon, B. Laurent, G. Belier, L. Tassan-Got, L. Audouin, B. Jurado, K.-H. Schmidt, J. Benlliure, F. Reymund, D. Dore and S. Panebianco......Page 216
1. Introduction......Page 217
2. Goals of the GSI  ssion experiments......Page 218
3.1. The GSI facility......Page 219
3.2. The SOFIA set-up......Page 220
4.1. FAIR......Page 221
5. Conclusion......Page 222
References......Page 223
The fission fragment time-of-flight spectrometer VERDI S. Oberstedt, R. Borcea, F.-J. Hambsch, Sh. Zeynalov, A. Oberstedt, A. Göök, T. Belgya, Z. Kis, L. Szentmiklosi, K. Takács and T. Martinez-Perez......Page 224
1. Introduction......Page 225
2. The Diamond-based Fission Trigger......Page 226
3. The Budapest Experiment......Page 227
4. Summary and Conclusions......Page 228
References......Page 230
1. Introduction......Page 232
2. Spectrometer Design Details......Page 233
3.1. Digital Electronics......Page 234
3.2. Data Processing......Page 235
4. Conclusion......Page 237
References......Page 238
1. Introduction......Page 240
2. The Lanthanum Halide Detectors......Page 241
3. The Budapest Experiment......Page 242
4. Results and Discussion......Page 243
References......Page 246
1. Introduction......Page 248
3. Characterization of the response to fission fragments......Page 249
4. Light quenching against actinide mass......Page 251
5. Simulations......Page 252
References......Page 253
Fission Probabilities: Barriers and Cross Sections......Page 254
2. Experimental setup......Page 256
3. 243Cm(n,f) measurement and results......Page 257
4. 245Cm(n,f) measurement and results......Page 260
References......Page 262
1. Introduction......Page 264
2. Experimental setup......Page 265
3. Measurement with the 235-U sample......Page 266
4. Measurement with the 245-Cm sample......Page 267
Acknowledgments......Page 269
References......Page 270
1. Introduction......Page 272
2. Neutron-induced fission rates......Page 273
3. How to test the rates?......Page 275
4. Conclusions and discussion......Page 277
References......Page 278
1. Introduction......Page 280
2.1. Fission chamber......Page 281
4. Results......Page 282
References......Page 283
1. Introduction......Page 284
3. Data Analysis......Page 285
4. Results and Discussion......Page 286
References......Page 287
Fission in the Super-heavy Mass Region......Page 288
1. Introduction......Page 290
2. Formation probability of Hs compound nuclei (Z=108) in the reactions with 22Ne, 26Mg, 36S, 58Fe ions......Page 291
3. Reactions with 48Ca-ions......Page 294
4. Transition from Ca to Ni ions......Page 296
5. Reactions with 58Fe and 64Ni ions......Page 299
6. Summary......Page 303
References......Page 304
1. Introduction......Page 306
2. Clusterization and shape isomeric states of heavy nuclei......Page 307
3. True ternary fission of superheavy nuclei......Page 310
4. Ternary quasi-fission of giant nuclear systems......Page 312
References......Page 313
1. Introduction......Page 314
2.1. The Kewpie2 code......Page 315
2.2. Evaporation residues......Page 316
3. Fission time measurements......Page 317
4. Influence of structures in the potential on the fission time10......Page 318
References......Page 320
Conference Photo......Page 322
List of Participants......Page 324
Author Index......Page 330