Anomalous behavior of the proton-induced fission cross sections of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">U</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>235</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">U</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>238</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> at extreme sub-barrier energies

N. N. Ajitanand; K. N. Iyengar; R. P. Anand; D. M. Nadkarni; A. K. Mohanty

doi:10.1103/PhysRevLett.58.1520

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Anomalous behavior of the proton-induced fission cross sections of ${}^{235}U$ and ${}^{238}U$ at extreme sub-barrier energies

N. N. Ajitanand, K. N. Iyengar, R. P. Anand, D. M. Nadkarni, and A. K. Mohanty

Nuclear Physics Division, Bhabha Atomic Research Centre, Trombay, Bombay 400085, India

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Phys. Rev. Lett. 58, 1520 – Published 13 April, 1987

DOI: https://doi.org/10.1103/PhysRevLett.58.1520

Abstract

The proton-induced fission cross section for ${}^{235}U$ and ${}^{238}U$ targets has been measured for $E_{p}$ =1–4 MeV for the first time. Compared with the measurements at higher energies, the present results indicate a pronounced change in the slope of the excitation function below 4 MeV such that standard optical-model estimates fall far short of the observed cross sections. No plausible explanation in terms of fission of either the target or the compound nucleus can be found.

References (11)

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[c1] Fusion Reactions Below the Coulomb Barrier, edited by S. G. Steadman, Lecture Notes in Physics Vol. 219 (Springer-Verlag, New York, 1985).

[c2] G. R. Choppin, J. R. Meriwether and J. D. Fox, Phys. Rev. 131, 2149 (1963).

[c3] G. L. Bate and J. R. Huizenga, Phys. Rev. 133, B1471 (1964).

[c4] V. N. Kononov, E. D. Poletaev and P. P. D'yachenko, Yad. Fiz. 27, 298 (1978) [Sov. J. Nucl. Phys. 27, 162 (1978)].

[c5] J. R. Boyce, T. D. Hayward, R. Bass, H. W. Newson, E. G. Bilpuch, F. O. Purser and H. W. Schmitt, Phys. Rev. C 10, 231 (1974).

[c6] R. L. Fleischer, P. B. Price, and R. M. Walker, Nuclear Tracks in Solids: Principles and Applications (Univ. California Press, Berkeley, 1975).

[c7] W. R. Smith, Comput. Phys. Commun. 1, 106 (1969).

[c8] B. Gyarmati, R. G. Lovas, T. Vertse and P. E. Hodgson, J. Phys. G 7, L209 (1981).

[c9] S. K. Gupta, S. Kailas, N. Lingappa and A. Shridhar, Phys. Rev. C 31, 1965 (1985).

[c10] K. Alder and A. Winther, Phys. Rev. 96, 237 (1954).

[c11] C. D. Bowman, I. G. Schroder, C. E. Dick and H. E. Jackson, Phys. Rev. C 12, 863 (1975).

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Anomalous behavior of the proton-induced fission cross sections of ${}^{235}U$ and ${}^{238}U$ at extreme sub-barrier energies

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Anomalous behavior of the proton-induced fission cross sections of U235 and U238 at extreme sub-barrier energies

Abstract

References (11)

Anomalous behavior of the proton-induced fission cross sections of ${}^{235}U$ and ${}^{238}U$ at extreme sub-barrier energies