Abstract
Our present understanding of neutron-nucleus interaction is largely based on Bohr’s statistical compound nucleus model.1 However, theoretical developments based on quantum corrections2 to Bohr’s model, together with considerable improvements in neutron spectroscopy have predicted and revealed the presence of marked fluctuations in the neutron cross sections of both fissile and fertile nuclei. These fluctuations are wider than the sharp resonances associated with the compound nucleus levels and narrower than the broad structure due to the energy dependence of the neutron penetration coefficients. They, in fact, represent departures from the statistical compound nucleus model in localized energy regions, leading to an intermediate structure which is not predicted by Bohr’s model. The observed enhancement of the neutron cross section is due to the presence of doorway states3,4 in the neutron channel or in the fission channels in fissile nuclei. The understanding and detection of this intermediate structure is of great relevance both in nuclear reaction theory and for the calculation of nuclear reactor parameters.
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References
C. E. Porter, R. G. Thomas, Phys. Rev. 104, 483 (1956).
V. M. Strutinsky, Nucl. Phys. A95, 420 (1967).
H. Feshbach, A. K. Kermann, and R. H. Lemmer, Ann. Phys. (NY) 41, 230 (1967).
D. Robson, Phys. Rev. 137, B535 (1965).
G. de Saussure and R. B. Perez, ORNL/TM-2599, Oak Ridge National Laboratory Report (1969).
H. Weigmann, Z. Phys. 214, 7 (1968).
R. B. Perez, G. de Saussure, and M. N. Moore, Proc. of the Second Intern. Atomic Energy Symposium on Physics and Chemistry of Fission, Vienna, Austria, 1969.
R. B. Perez, G. de Saussure, R. L. Macklin, and J. Halperin, Phys. Rev. C 20, 528 (1979).
E. P. Wigner, “Statistical Theory of Spectra Fluctuations,” C. E. Porter, Editor, p. 120 in Academic Press, NY 1965.
A. Wald and J. Wolfowitz, Math. Stat XI 2 (1940).
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© 1989 Plenum Press, New York
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de Saussure, G., Perez, R.B. (1989). Stochastic Nuclear Reaction Theory: Breit-Wigner Nuclear Noise. In: Muñoz-Cobo, J.L., Difilippo, F.C. (eds) Noise and Nonlinear Phenomena in Nuclear Systems. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5613-4_36
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DOI: https://doi.org/10.1007/978-1-4684-5613-4_36
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