Seminar on fission, Corsendonk Priory : Belgium, 18-21 September 2007

This conference is the sixth in a series of topical meetings dealing with the nuclear fission process, mainly at low excitation energy. During these meetings, actual topics are discussed by a group of experts. These proceedings give an overview of the topics treated at the conference and permit a rapid overview of the current activities in the field. Sample Chapter(s). Chapter 1: Angular Momentum in Fission (1,186 KB). Contents: Angular Momentum in Fission (F Gönnenwein et al.); Proton Induced Fission on Actinide Nuclei at Medium Energy (S Isaev et al.); Fission Cross Sections of Minor Actinid CONTENTS......Page 10 Organisations......Page 6 Organising and Scientific Advisory Committees......Page 7 Preface......Page 8 Topical Reviews......Page 14 Angular Momentum in Fission F. Gonnenwein, V. Bunakov, 0. Dowaux, A. Gagarski, I. Guseva, F. Hanappe, S. Kadmensky, J. Von Kalben, S. Khlebnikov, V. Kinnard, Yu. Kopatch, M Mutterer, V. Nesvizhevsky, G. Petrov, E. Prokhorova, V. Rubchenyu, M. Sillanpaa G. Simpson, V. Sokolov, T. Soldner, L. Stuttgi, G. Tiourine, W. Trzaska, I. Tsekhanovich, C. Wagemans, H.-J. Wollersheim, T. Zavarukhina, 0. Zimmer......Page 16 1. Introduction......Page 17 2. The ROT effect......Page 18 3. Angular momentum of fission fragments......Page 24 4. Anisotropy of neutron emission in the cm system of fragments......Page 30 Acknowledgements......Page 35 References......Page 36 The Processes of Fusion-Fission and Quasi-Fission of Heavy and Super-Heavy Nuclei M G. Itkis, A. A. Boguchev, E. V. Chernysheva, I. M Itkis. G. N. Knyazheva, N. A . Kondratiev, E. M. Kozulin, L. Krupa. F. Hanappe, 0. Dowaux, N. Rowley, L. Stuttgi, A . M Stefanini, B. R. Behera, L. Corradi, E. Fioretto, A. Gadea, A. Latina, S. Sziher, M. Trotta, S. Beghini, G. Montagnoli, F. Scarlassara, V. A. Rubchenya, W. H. Trzaska......Page 38 1. Introduction......Page 39 2.1. The influence of entrance channel mass asymmetry......Page 40 2.2. Bimodaljission of 274Hs......Page 43 2.3. The influence of deformation and fragment shell on quasi-fission......Page 46 2.4. Reactions with heavy ions leading to the formation of super-heavy systems......Page 48 2.5. Neutron and gamma-ray multiplicities in the fission of SHE......Page 54 3. Conclusion and Outlook......Page 55 References......Page 56 Fission Cross Sections and Fragment Properties......Page 58 1. Introduction......Page 60 2.1. Experimental set-up......Page 62 3. Fission cross sections......Page 63 4. Fission-Fragment mass yields......Page 66 References......Page 67 1. Introduction......Page 68 2. Experiment......Page 69 3. Analysis and discussion......Page 70 References......Page 75 Fission Cross Sections of Minor Actinides and Application in Transmutation Studies A . Letourneau, 0. Bringer, S. Chabod, E. Dupont, G. Fioni, F. Marie, S. Panebianco, Ch. Veyssiere, L. Oriol, F. Chartier, P. Mutti, I. Almahamid......Page 76 2. Impact of fission cross section uncertainties on incineration......Page 77 3.1. Experimental approach......Page 78 3.2. Analysis tools......Page 79 4.1. z38Np(n& measurement......Page 80 4.2. 24ZgSAm(n,J and Z42mAm(n,fl measurements......Page 81 4.3. 245 Cm ( n,f) measurements......Page 82 References......Page 83 1. Introduction......Page 84 2. Inverse kinematics data......Page 86 3. Even-odd effect at symmetry for neutron induced fission......Page 87 References......Page 89 1. Introduction......Page 92 2. The Lohengrin mass spectrometer......Page 93 3. Mass yields and kinetic energy distributions......Page 94 4. Isotopic yields......Page 97 References......Page 99 Ternary Fission......Page 100 On the Ternary a Spectrum in 252Cf(sf) M Mutterer, Yu. N. Kopatch, S. R. Yamaledtinov, V. G. Lyapin, J. von Kalben, S. V. Khlebnikov, M Sillanpaa, G. P. Tyurin, W: H. Trzaska......Page 102 1. Introduction......Page 103 2. Layout of Experiment......Page 104 3. Data Analysis......Page 105 4. Results and Discussion......Page 108 5 . Summary and Outlook......Page 110 References......Page 111 1. Introduction......Page 112 2. The energy degrader......Page 113 3. Ternary fission from the system 23sU + nth......Page 115 4. Summary and conclusion......Page 118 References......Page 119 1. Introduction......Page 120 2.2. Detection system......Page 121 3.1. Particle identification......Page 123 3.2. Results for the 249Cf(nlhJ) measurement......Page 124 3.3. Results for the zs’Cf(n,h? measurement......Page 126 4. Discussion......Page 128 References......Page 129 1. Introduction......Page 130 2.2. Widths of the energy distributions......Page 131 2.3. Ternary a and triton emission probabilities......Page 132 2.4. Influence of the excitation energy......Page 134 References......Page 135 Neutron Emission in Fission......Page 136 1. Introduction......Page 138 2. The prompt fission neutron spectrum......Page 139 3. Neutron multiplicity and average energy versus fission fragment split......Page 145 References......Page 149 1. Introduction......Page 151 2.1. Experimental Evidence......Page 152 2.2. Theoretical Modeling: The Sudden Approximation......Page 153 3.1. Theoretical Model and Computational Details......Page 154 3.2. Numerical Results......Page 155 4.1. Experiment......Page 156 4.2. Theory......Page 157 References......Page 158 1. Introduction......Page 159 2.1. Fission Fragment Population......Page 160 2.2. Prompt Neutron and Gamma Multiplicities......Page 162 2.3. Neutron Average Energy......Page 164 3. Results......Page 165 4. Conclusions and Projects......Page 169 References......Page 170 Fission Theory......Page 172 1. Introduction......Page 174 3. Rotational states......Page 175 4. Shape isomer......Page 177 5 . Fission barriers......Page 178 6. Conclusion......Page 181 References......Page 182 2. Theoretical framework......Page 184 3. Definition of the scission line......Page 185 5 . Conclusion......Page 186 References......Page 188 Introduction......Page 190 1. The Statistical Model and its application for calculations......Page 191 2. Calculations of neutron-induced fission rates on the basis of different mass predictions.......Page 193 3. The fit for neutron-induced fission rates......Page 196 Acknowledgements......Page 197 Bibliography......Page 198 Facilities and Detectors......Page 200 1. Introduction......Page 202 2. Spectrometer Layout......Page 203 3. Digital DAQ and Data Rates......Page 205 5. Nuclear Charge Determination and Ranges of FFs......Page 206 6 . Conclusion......Page 208 References......Page 209 Development of PSD and ToF + PSD Techniques for Fission Experiments M Sillanpaa, M. Mutterer, W. H. Trzaska, G. Tyurin, Yu. N. Kopatch, S. Smirnov. S. Khlebnikov, J. von Kalben......Page 210 1. Introduction......Page 211 2.1. Physical setup and geometry......Page 212 2.2. Electronic system......Page 213 3. Results......Page 214 4. Discussion......Page 217 References......Page 218 1. MYRRHA within the mission of SCKCEN......Page 220 3.1. The ADONIS-project (1995-1997)......Page 221 3.2. From ADONIS to MYRRHA (1998-2005)......Page 222 3.4. From MYRRHA to XT-ADS (2005-2009)......Page 224 3.5.1. Spallation target support R&D......Page 226 3.5.3. LBE submerged remote handling......Page 227 4.1. Engineering design......Page 228 5.1. Engineering design......Page 229 5.2.3. LBE submerged remote handling......Page 231 5.3. Project organisation......Page 232 References......Page 234 1. Introduction......Page 236 3. The main irradiation facilities of the BR1 reactor......Page 237 4.1. Measurement offission rate ratios......Page 240 4.2. Determination ofCm(nJ) cross sections......Page 241 References......Page 242 “Special” Fission Processes......Page 244 Shape Isomers - A Key to Fission Barriers S. Oberstedt, F.-J. Hambsch, N. Kornilov, G. Lovestam, A. Oberstedt, M Gawlys......Page 246 2. Experimental approach to fission barriers......Page 247 3. Direct survey of fission barriers......Page 250 4. Conclusion......Page 252 References......Page 253 1. Introduction......Page 254 2. Spallation reactions......Page 255 3. Conditions of fission in spallation experiments......Page 257 5.1. The general model......Page 259 5.2. The INC model......Page 260 5.3. The evaporation-fission model......Page 261 6 . Results with the INCL4+ABLA model......Page 263 7. Sensitivity to the input data......Page 264 9. Conclusion......Page 269 References......Page 270 Conference Photo......Page 272 List of Participants......Page 274 Author Index......Page 278 This conference is the sixth in a series of topical meetings dealing with the nuclear fission process, mainly at low excitation energy. During these meetings, actual topics are discussed by a group of experts. These proceedings give an overview of the topics treated at the conference and permit a rapid overview of the current activities in the field. Sample Chapter(s). Chapter 1: Angular Momentum in Fission (1,186 KB). Contents: Angular Momentum in Fission (F Gönnenwein et al.); Proton Induced Fission on Actinide Nuclei at Medium Energy (S Isaev et al.); Fission Cross Sections of Minor Actinid Proton-Induced Fission on Actinide Nuclei at Medium Energy S. Isaev, R. Prieels, Th. Keutgen, J. Van Mol, K El Masri, P. Demetriou1. Introduction; 2. Experiment; 3. Analysis and discussion; References; Fission Cross Sections of Minor Actinides and Application in Transmutation Studies A . Letourneau, 0. Bringer, S. Chabod, E. Dupont, G. Fioni, F. Marie, S. Panebianco, Ch. Veyssiere, L. Oriol, F. Chartier, P. Mutti, I. Almahamid; 1. Introduction; 2. Impact of fission cross section uncertainties on incineration; 3. Experiments at ILL; 3.1. Experimental approach; 3.2. Analysis tools Organisations; Organising and Scientific Advisory Committees; Preface; CONTENTS; Topical Reviews; Angular Momentum in Fission F. Gonnenwein, V. Bunakov, 0. Dowaux, A. Gagarski, I. Guseva, F. Hanappe, S. Kadmensky, J. Von Kalben, S. Khlebnikov, V. Kinnard, Yu. Kopatch, M Mutterer, V. Nesvizhevsky, G. Petrov, E. Prokhorova, V. Rubchenyu, M. Sillanpaa G. Simpson, V. Sokolov, T. Soldner, L. Stuttgi, G. Tiourine, W. Trzaska, I. Tsekhanovich, C. Wagemans, H.-J. Wollersheim, T. Zavarukhina, 0. Zimmer; 1. Introduction; 2. The ROT effect; 3. Angular momentum of fission fragments 4. Anisotropy of neutron emission in the cm system of fragments5. Outlook; Acknowledgements; References; The Processes of Fusion-Fission and Quasi-Fission of Heavy and Super-Heavy Nuclei M G. Itkis, A.A. Boguchev, E.V. Chernysheva, I.M Itkis. G.N. Knyazheva, N.A . Kondratiev, E.M. Kozulin, L. Krupa. F. Hanappe, 0. Dowaux, N. Rowley, L. Stuttgi, A . M Stefanini, B. R. Behera, L. Corradi, E. Fioretto, A. Gadea, A. Latina, S. Sziher, M. Trotta, S. Beghini, G. Montagnoli, F. Scarlassara, V.A. Rubchenya, W. H. Trzaska; 1. Introduction; 2. Results and Discussions Minor-Actinides Fission Cross Sections and Fission Fragment Mass Yields via the Surrogate Reaction Technique B. Jurudo, G. Kessedjian, M. Ai'che, G. Barreau, A. Bidaud, S. Czajkowski, D. Dassii, B. Haas, L. Mathieu, B. Osmanov, L. Audouin, N. Capellan, L. Tussan-Got, J.N. Wilson, E. Berthoumieux, F. Gunsing, Ch. Theisen, E. Bauge, 0. Serot, I. Ahmad, J.P. Greene, R. V.F. Janssens1. Introduction; 2. Experiment; 2.1. Experimental set-up; 3. Fission cross sections; 4. Fission-Fragment mass yields; 5. Conclusions; Acknowledgments; References