Fission study for the system84Kr+232Th at 25, 35 and 45 MeV/u (original) (raw)
Related papers
Fission fragment-light particle coincidences and linear momentum transfer
Nuclear Physics A, 1986
Linear momentum transfer in 40Ar+'97A~ at 19.6 MeV/u and 40Ar+238U at 19.6 and 35 MeV/u has been investigated by measuring the correlation angle between two fission fragments. Fast light charged particles were measured in coincidence with fission events. Results show that the main part of the missing linear momentum is likely removed by a piece of the projectile after it has broken up. A change in the reaction mechanism seems to occur around 35 MeV/u. An interpretation, in terms of the highest possible energy content in a nuclear system is suggested. NUCLEAR REACTIONS '97Au(40Ar, F), E = 19.6 MeV/nucleon; *3sU(40Ar, F), E = E 35 MeV/nucleon; measured fission (fragment)(fragment)(0); deduced linear momentum transfer, reaction mechanisms.
High momentum and energy transfer induced by 1760 MeV 40Ar ON 197Au and 232Th targets
Physics Letters B, 1984
Angular correlations between fission fragments induced by 1760 MeV 4°Ar bombarding 197Au and 232Th targets have been measured. Energies, velocities and masses have been obtained for both fragments. The momentum transfer and energy deposited were deduced from an event-by-event analysis. The recoil velocity and total mass spectra show that mass transfer is still a dominating process. Momentum transfer of at least 6.5 GeV/c and 900 MeV excitation energy are deduced.
Momentum transfer in light-ion-induced fission reactions
Nuclear Physics A, 1984
Angular correlations and angular distributions of the fission fragments produced in the bombardment of a *32Th target with protons, deuterons and a-particles in the energy range between 35 and 1000 MeV/nucleon have been measured. From these measurements, the distributions of linear momentum imparted to Fissioning nuclei have been deduced in the various energy regimes; dominating reaction mechanisms are classified according to the fraction of the available incident momentum transferred to the target. The experimental results are compared to the predictions of intra-nuclear cascade calculations. An optimum excitation energy supported by the fissioning nuclei could be the dominant limitation to momentum transfer at high incident energies. The angular distributions of the fission fragments were used to extract fission cross sections and upper limits of the angular momentum imparted to the fissioning nuclei. E NUCLEAR REACTIONS
Zeitschrift f�r Physik A Atoms and Nuclei, 1984
The time-of-flight technique was used to measure the mass and kinetic energy distribution of fragments from fission of 233U, 235U and 239pu, induced by thermal neutrons at the Grenoble High Flux Reactor. The data array is presented as equal probability lines in the high kinetic energy regions. The fluctuations observed in those experimental lines are explained by a static scission configuration model, in which the most important influence comes from the Coulomb interaction energy between the two fragments. The highest values of total kinetic energy are obtained for fragmentations with heavy fragments Z = 50-52, N = 80-82 and light fragments Z = 40-42, N = 60-64.
European Physical Journal A, 2007
With a view to study complete-and incomplete-fusion components in 159 Tb, 169 Tm( 16 O, x) reactions, experiments have been carried out at the Inter-University Accelerator Center, New Delhi, India using the 15UD Pelletron accelerator facilities. The forward mean recoil ranges for some radio-nuclides; 168m Lu, 167 Lu, 167 Yb, 166 Tm produced in the 16 O + 159 Tb system at ≈ 90 MeV, and 179 Re, 177 Re, 177 W, 178 Ta and 177 Hf produced in the 16 O + 169 Tm system at ≈ 87 MeV have been measured. The recoilcatcher activation technique followed by off-line γ-spectrometry has been employed in the present work. The analysis of forward mean ranges for different radio-nuclides has been done in the framework of the degree of linear momentum transfer from projectile to target nucleus by adopting break-up fusion model considerations. Different complete-and incomplete-fusion components, which may be attributed to the fusion of 16 O and/or 12 C and 8 Be transfer from the 16 O projectile to the target nucleus have been observed. An attempt has also been made to separate out the relative percentage contributions of complete-and incomplete-fusion components using experimentally measured forward recoil ranges. The complete-fusion contributions deduced from recoil range distribution are found to be consistent with the prediction of the theoretical model code PACE. The analysis of data indicates the complete-and incomplete-fusion competition for both the systems at the given energies.
Charge, Mass and Energy Distributions of Fission Fragments in 235U and 239Pu (nth, f) Reactions
Heavy fission fragments distributions of 235U and 239Pu by thermal neutrons were measured using mass spectrometer. The treatment of the experimental data for the 235U(nth, f) and 239Pu(nth, f) nuclear fission reactions is presented. Charge, mass and energy yields of fission fragments with Ai = 125 to 157, kinetic energies from Ek = 45 to Ek = 87 MeV and effective ionic charges from z* = 18 to z* = 30 are obtained. The good consent of experimental and theoretical data for mass yields is indicated. Some increment in FF mass yields is observed for 235U (nth, f) reaction in A = 151-153 mass range.
ANALYSIS OF YIELDS OF FUSION-FISSION AND QUASIFISSION FRAGMENTS IN HEAVY ION COLLISIONS
The decrease of the evaporation residues yield in reactions with massive nuclei is explained by increase of the competition between quasifission and complete fusion processes and by the decrease of the survival probability of the heated and rotating compound nucleus against fission. The experimental data on the yields of evaporation residues, fusion-fission and quasifission fragments in the 48 Ca + 154 Sm reaction are analyzed simultaneously in the framework of the theoretical method based on the DNS concept and advanced statistical model. The measured yields of evaporation residues and fission fragments for the 48 Ca + 154 Sm reaction have been well reproduced by using the partial fusion and quasifission cross sections obtained in the DNS model. Such way of calculation is used to find optimal conditions for the synthesis of the new element Z = 120 (A = 302).We compare the excitation functions of evaporation residues of the three reactions 54 Cr + 248 Cm, 58 Fe + 244 Pu, and 64 Ni + 238 U. Our estimations show that the 54 Cr+ 248 Cm reaction is preferable in comparison with the two others because the excitation function of the evaporation residues is some orders of magnitude higher and the optimal energy for the synthesis is lower than that for the 58 Fe + 244 Pu and 64 Ni + 238 U reactions.