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Title: Multistep direct mechanism in the (p-vector,{sup 3}He) inclusive reaction on {sup 59}Co and {sup 93}Nb at incident energies between 100 and 160 MeV

Abstract

Emission-energy distributions for cross sections as well as analyzing powers were investigated for (p-vector,{sup 3}He) reactions on {sup 59}Co and {sup 93}Nb to the continuum from a threshold of {approx}40 MeV up to the kinematic limit at incident energies of 130 and 160 MeV. A range of scattering angles from 15 degree sign to 140 deg. (laboratory) was explored. The experimental distributions were compared with a multistep direct theory in which a reaction mechanism based on deuteron pickup is employed. Reasonable agreement between experimental double differential cross sections and analyzing powers and the theoretical expectation was obtained. This work, together with published results for the same reaction and targets at a lower projectile energy of 100 MeV, allowed the incident-energy dependence of the cross section and analyzing power distributions to be explored.

Authors:
 [1];  [2]; ; ; ; ;  [1];  [3];  [4]; ; ; ;  [5]
  1. Department of Physics, University of Stellenbosch, Private Bag X1, Matieland 7602 (South Africa)
  2. (South Africa)
  3. Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784 Sofia (Bulgaria)
  4. Particle Physics Laboratory, Department of Physics, University of Oxford, Oxford OXI 3RH (United Kingdom)
  5. iThemba Laboratory for Accelerator Based Sciences, PO Box 722, Somerset West 7129 (South Africa)
Publication Date:
OSTI Identifier:
20995303
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevC.75.054617; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COBALT 59; DEUTERONS; DIFFERENTIAL CROSS SECTIONS; ENERGY SPECTRA; HELIUM 3; MEV RANGE 100-1000; NIOBIUM 93; POLARIZATION-ASYMMETRY RATIO; REACTION KINETICS

Citation Formats

Cowley, A. A., iThemba Laboratory for Accelerator Based Sciences, PO Box 722, Somerset West 7129, Bezuidenhout, J., Hillhouse, G. C., Jacobs, N. M., Stander, J. A., Zyl, J. J. van, Dimitrova, S. S., Hodgson, P. E., Foertsch, S. V., Neveling, R., Smit, F. D., and Steyn, G. F. Multistep direct mechanism in the (p-vector,{sup 3}He) inclusive reaction on {sup 59}Co and {sup 93}Nb at incident energies between 100 and 160 MeV. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.054617.
Cowley, A. A., iThemba Laboratory for Accelerator Based Sciences, PO Box 722, Somerset West 7129, Bezuidenhout, J., Hillhouse, G. C., Jacobs, N. M., Stander, J. A., Zyl, J. J. van, Dimitrova, S. S., Hodgson, P. E., Foertsch, S. V., Neveling, R., Smit, F. D., & Steyn, G. F. Multistep direct mechanism in the (p-vector,{sup 3}He) inclusive reaction on {sup 59}Co and {sup 93}Nb at incident energies between 100 and 160 MeV. United States. doi:10.1103/PHYSREVC.75.054617.
Cowley, A. A., iThemba Laboratory for Accelerator Based Sciences, PO Box 722, Somerset West 7129, Bezuidenhout, J., Hillhouse, G. C., Jacobs, N. M., Stander, J. A., Zyl, J. J. van, Dimitrova, S. S., Hodgson, P. E., Foertsch, S. V., Neveling, R., Smit, F. D., and Steyn, G. F. Tue . "Multistep direct mechanism in the (p-vector,{sup 3}He) inclusive reaction on {sup 59}Co and {sup 93}Nb at incident energies between 100 and 160 MeV". United States. doi:10.1103/PHYSREVC.75.054617.
@article{osti_20995303,
title = {Multistep direct mechanism in the (p-vector,{sup 3}He) inclusive reaction on {sup 59}Co and {sup 93}Nb at incident energies between 100 and 160 MeV},
author = {Cowley, A. A. and iThemba Laboratory for Accelerator Based Sciences, PO Box 722, Somerset West 7129 and Bezuidenhout, J. and Hillhouse, G. C. and Jacobs, N. M. and Stander, J. A. and Zyl, J. J. van and Dimitrova, S. S. and Hodgson, P. E. and Foertsch, S. V. and Neveling, R. and Smit, F. D. and Steyn, G. F.},
abstractNote = {Emission-energy distributions for cross sections as well as analyzing powers were investigated for (p-vector,{sup 3}He) reactions on {sup 59}Co and {sup 93}Nb to the continuum from a threshold of {approx}40 MeV up to the kinematic limit at incident energies of 130 and 160 MeV. A range of scattering angles from 15 degree sign to 140 deg. (laboratory) was explored. The experimental distributions were compared with a multistep direct theory in which a reaction mechanism based on deuteron pickup is employed. Reasonable agreement between experimental double differential cross sections and analyzing powers and the theoretical expectation was obtained. This work, together with published results for the same reaction and targets at a lower projectile energy of 100 MeV, allowed the incident-energy dependence of the cross section and analyzing power distributions to be explored.},
doi = {10.1103/PHYSREVC.75.054617},
journal = {Physical Review. C, Nuclear Physics},
number = 5,
volume = 75,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • Measurements of inclusive (p,{sup 3}He) reactions on {sup 59}Co and {sup 197}Au at incident energies of 120, 160, and 200 MeV are compared with calculations based on a statistical multistep direct reaction theory. The angular range extends from 10{degree} to 160{degree} and emission energies exceeding 30 MeV were studied. It is found that the multistep contributions are dominant for all but the highest outgoing energies. This is in qualitative agreement with previous results for the inclusive (p,{alpha}) reaction at the same incident energies and targets. {copyright} {ital 1997} {ital The American Physical Society}
  • Measurements of inclusive ({ital p},{alpha}) reactions on {sup 27}Al, {sup 59}Co, and {sup 197}Au at incident energies between 120 and 200 MeV are compared with the trend expected from systematics and also with calculations based on a statistical multistep direct reaction theory. Although reasonable agreement is obtained between the experimental angular distributions and the predictions of the parametrized systematics at various emission energies, significant discrepancies are nevertheless observed. Calculations with the quantum-mechanical multistep formulation confirm that the higher-step contributions are more important at these incident energies than found in a previous study at lower projectile energies. {copyright} {ital 1996 Themore » American Physical Society.}« less
  • Continuous spectrum cross sections were studied for inelastic (/sup 3/He,/sup 3/He') scattering on /sup 27/Al, /sup 58//sup ,//sup 60/Ni, /sup 59/Co, /sup 90/Zr, and /sup 112/Sn nuclei at accelerated /sup 3/He ion energies of 60.5 MeV. The experimental data are satisfactorily described by the phenomenological model of statistical multistep processes, except for the region of small angles <30--45/sup 0/. At small angles a very strong asymmetry was observed, which may be connected with inelastic scattering of /sup 3/He on surface ..cap alpha.. clusters. The generalized exciton model gives a substantially worse description of the experimental data. Nuclear quasitemperature parameters aremore » determined, as well as the relative contribution to the cross section at a given angle from different steps of the statistical multistep process.« less
  • Angular distributions of /sup 58/Ni(/sup 3/He,d)/sup 59/Cu transitions leading to the (0.0 MeV, 3/2/sup -/), (0.91 MeV, 5/2/sup -/) and (3.04 MeV, 9/2/sup +/) states in /sup 59/Cu have been measured at an incident energy of 13 MeV. The experimental data have been used to study mainly the role of the /sup 3/He optical model potential ambiguity in the distorted-wave Born approximation description of the reaction. Satisfactory fits to the data are obtained using a deep helion potential in standard local zero-range calculations. For a shallow /sup 3/He potential a comparable description can be achieved if the depth of themore » real part of the deuteron optical potential is reduced considerably, and nonlocality as well as finite-range corrections are taken into account. Under these conditions, the use of a /sup 3/He potential constructed according to the Johnson-Soper prescription yields similar results.« less