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Full-Text Articles in Physical Sciences and Mathematics
Mass Asymmetric Fission Barriers For 75br, D. N. Delis, Y. Blumenfeld, D. R. Bowman, N. Colonna, K. Hanold, K. Jing, M. Justice, J. C. Meng, Graham F. Peaslee, G. J. Wozniak, L. G. Moretto
Mass Asymmetric Fission Barriers For 75br, D. N. Delis, Y. Blumenfeld, D. R. Bowman, N. Colonna, K. Hanold, K. Jing, M. Justice, J. C. Meng, Graham F. Peaslee, G. J. Wozniak, L. G. Moretto
Faculty Publications
Fragments with atomic numbers covering nearly the entire range of the mass-asymmetry coordinate (4 < Z < 27) were observed from the 5.0, 6.2, 6.9, 8.0, 10.2 and 12.7 MeV/A 63Cu + 12C reactions. Energy spectra and angular distributions show the presence of projectile-like and target-like components along with an isotropic component. The isotropic component appears as a Coulomb ring in the invariant cross-section plots indicating the presence of a binary compound nucleus decay which is confirmed by the coincidence data. Excitation functions were constructed for each Z value and a nearly complete set of mass-asymmetric barriers has been extracted for 75Br. There is excellent agreement between the experimentally determined barriers and the finite-range model predictions.
Multifragment Emission In The Reaction 36ar + 197au At E/A = 35, 50, 80, And 110 Mev, R. T. De Souza, L. Phair, D. R. Bowman, N. Carlin, C. K. Gelbke, W. G. Gong, Y. D. Yim, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, M. B. Tsang, H. M. Tsang, H. M. Xu, F. Zhu, W. A. Friedman
Multifragment Emission In The Reaction 36ar + 197au At E/A = 35, 50, 80, And 110 Mev, R. T. De Souza, L. Phair, D. R. Bowman, N. Carlin, C. K. Gelbke, W. G. Gong, Y. D. Yim, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, M. B. Tsang, H. M. Tsang, H. M. Xu, F. Zhu, W. A. Friedman
Faculty Publications
Multifragment emission in the reaction at has been measured with a low-threshold 4π detector array. Over this broad range of incident energies, the mean values and variances of the intermediate mass fragment (IMF: 3 ⩽ Z ⩽ 20) multiplicity distributions exhibit an approximate scaling with the total charged particle multiplicity. The measured multiplicities of light charged particles and intermediate mass fragments are compared with both a model involving statistical decay of an expanding compound nucleus, and with a model involving microscopic quasi-particle dynamics. The statistical decay model predictions are sensitive to the low-density nuclear equation of state.
Multifragment Disintegration Of The Xe+Au System At E/A=50 Mev, D. R. Bowman, Graham F. Peaslee, R. T. De Souza, N. Carlin, C. K. Gelbke, W. G. Gong, Y. D. Yim, M. A. Lisa, W. G. Lynch, L. Phair, M. B. Tsang, C. Williams, C. Williams, N. Colonna, K. Hanold, M. A. Mcmahan, G. J. Wozniak, L. G. Moretto, W. A. Friedman
Multifragment Disintegration Of The Xe+Au System At E/A=50 Mev, D. R. Bowman, Graham F. Peaslee, R. T. De Souza, N. Carlin, C. K. Gelbke, W. G. Gong, Y. D. Yim, M. A. Lisa, W. G. Lynch, L. Phair, M. B. Tsang, C. Williams, C. Williams, N. Colonna, K. Hanold, M. A. Mcmahan, G. J. Wozniak, L. G. Moretto, W. A. Friedman
Faculty Publications
Multifragment disintegrations following Xe129+197Au collisions at E/A=50 MeV have been studied with a multidetector system covering 88% of 4π in solid angle. The average number of intermediate-mass fragments (Z=3–20) increases strongly as a function of charged-particle multiplicity and reaches values larger than six for the most violent collisions. The results are compared to calculations with both dynamical and statistical models.
Multifragment Disintegrations Of The 36ar + 197au Systems At E/A=35-110 Mev , Y. D. Kim, R. T. De Souza, L. Phair, D. R. Bowman, N. Carlin, C. K. Gelbke, W. G. Gong, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, M. B. Tsang, C. Williams, F. Zhu, W. A. Friedman, S. Pratt
Multifragment Disintegrations Of The 36ar + 197au Systems At E/A=35-110 Mev , Y. D. Kim, R. T. De Souza, L. Phair, D. R. Bowman, N. Carlin, C. K. Gelbke, W. G. Gong, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, M. B. Tsang, C. Williams, F. Zhu, W. A. Friedman, S. Pratt
Faculty Publications
Intermediate mass fragment (IMF: 3≤Z≤20) emission for the 36Ar+197 Au reaction at E/A=35, 50, 80, 110 MeV has been studied with a low‐threshold 4π charged‐particle detector array. Multiplicities of intermediate mass fragments gated on total charged‐particle multiplicities have been extracted with an average multiplicity of 4 intermediate mass fragments for the most central collisions at E/A=110 MeV. Two‐fragment correlation functions are presented for various gates on the fragment energy, and information about the time‐scale of fragment emission is extracted.
A Complete Ridge-Line Potential For Complex Fragment Emission, D. N. Delis, Y. Blumenfeld, D. R. Bowman, N. Colonna, K. Hanold, K. Jing, M. Justice, J. C. Meng, Graham F. Peaslee, G. J. Wozniak, L. G. Moretto
A Complete Ridge-Line Potential For Complex Fragment Emission, D. N. Delis, Y. Blumenfeld, D. R. Bowman, N. Colonna, K. Hanold, K. Jing, M. Justice, J. C. Meng, Graham F. Peaslee, G. J. Wozniak, L. G. Moretto
Faculty Publications
Cross sections were measured for fragments (4
Equilibrium And Non-Equilibrium Complex Fragment Emission In 50-100 Mev/U 139la + 12c Reactions, D. R. Bowman, Graham F. Peaslee, N. Colonna, R. J. Charity, M. A. Mcmahan, D. Delis, H. Han, K. Jing, G. J. Wozniak, L. G. Moretto, W. L. Kehoe, B. Libby, A. C. Mignerey, A. Moroni, S. Angius, I. Iori, A. Pantaleo, G. Guarino
Equilibrium And Non-Equilibrium Complex Fragment Emission In 50-100 Mev/U 139la + 12c Reactions, D. R. Bowman, Graham F. Peaslee, N. Colonna, R. J. Charity, M. A. Mcmahan, D. Delis, H. Han, K. Jing, G. J. Wozniak, L. G. Moretto, W. L. Kehoe, B. Libby, A. C. Mignerey, A. Moroni, S. Angius, I. Iori, A. Pantaleo, G. Guarino
Faculty Publications
Complex fragment emission (Z > 2) has been studied in the reactions of 50, 80, and 100 MeV/u139La + 12C. Charge, angle, and energy distributions were measured inclusively and in coincidence with other complex fragments, and were used to extract source rapidities, velocity distributions, and cross sections. The binary signature of the coincidence events and the sharpness of the velocity distributions illustrate the primarily 2-body nature of these reactions. Calculations based on statistical compound nucleus decay have been compared with the experimental data. The emission velocities, angular distributions, and absolute cross sections of fragments of 20 ⩽ Z ⩽ 35 at …
Multifragment Events From Heavy-Ion Collisions: Sources And Excitation Functions, Y. Blumenfeld, N. Colonna, P. Roussel-Chomaz, D. N. Delis, K. Hanold, J. C. Meng, Graham F. Peaslee, Q. C. Sui, G. J. Wozniak, L. G. Moretto, B. Libby, A. C. Mignerey, G. Guarino, N. Santoruvo, I. Iori
Multifragment Events From Heavy-Ion Collisions: Sources And Excitation Functions, Y. Blumenfeld, N. Colonna, P. Roussel-Chomaz, D. N. Delis, K. Hanold, J. C. Meng, Graham F. Peaslee, Q. C. Sui, G. J. Wozniak, L. G. Moretto, B. Libby, A. C. Mignerey, G. Guarino, N. Santoruvo, I. Iori
Faculty Publications
Multifragment events from 35, 40, 45, and 55 MeV/nucleon La139+12C, Al27, Ca40, V51, Cunat, and La139 reactions can be assigned to sources characterized by their velocity. At each bombarding energy, the probabilities of threefold, fourfold and fivefold events increase substantially with decreasing source velocity, but are independent of the target mass. To remove the bombarding-energy dependence, a simple transformation has been applied which gives the excitation energy of the fused system in the simple incomplete-fusion picture. These ‘‘excitation functions’’ appear to independent of both the system and bombarding energy.