Abstract
The capture process of heavy ions has been investigated by an analysis of the fission exit channel. Mass and angular distributions were measured for fission fragments produced in the reaction 169 Tm(36 Ar, f) at bombarding energies of E lab = 178 MeV, 189 MeV, 205 MeV and 237 MeV. At E lab =189 and 205 MeV complete mass equilibration has been observed together with anisotropies of the fission fragment angular distributions consistent with predictions of the transition state model. At our lowest energy measured so far, which is roughly four MeV above the Bass barrier, we notice a small mass drift with angle and an unusually large anisotropy. This behavior is considered an indication of increased relative probability for non-compound fission at near-barrier energies.
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References
D.L. Hill, J.H. Wheeler, Phys. Rev 89, 1102 (1953)
C.Y. Wong, Phys. Rev. Lett. 31, 766 (1973)
R. Vandenbosch et al., Phys. Rev. C28, 1161 (1983)
R. Vandenbosch et al., Phys. Rev. Lett. 56, 1234 (1986)
T. Murakami et al., Phys. Rev. C34, 1353 (1986)
A. Bohr, in Proceedings of the United Nations International Conference on the Peaceful Uses of Atomic Energy (United Nations, New York, 1956), Vol. 2, p. 151
I. Halpern and V.M. Strutinsky, in Proceedings of the Second United Nations International Conference on the Peaceful Uses of Atomic Energy (United Nations, Geneva, Switzerland, 1958), Vol. 15, p. 408
R. Vandenbosch and J.R. Huizenga, Nuclear Fission (Academic Press, New York, 1973)
S. Cohen, F. Plasil, W.J. Swiatecki, Ann. Phys. (N.Y.) 82, 557 (1974)
A. Gavron et al., Phys. Rev. Lett. 52, 589 (1984)
B.B. Back, Phys. Rev C31, 2104 (1985)
B.B. Back et al., Phys. Rev C32, 195 (1985)
M.B. Tsang et al., Phys. Lett. 129, 18 (1983)
M.B. Tsang et al., Phys. Rev. C28, 747 (1983)
H. Rossner, J.R. Huizenga, W.U. Schröder, Phys. Rev. C33, 560 (1986)
V.S. Ramamurthy and S.S. Kapoor, Phys. Rev. Lett. 54 178 (1985)
V.S. Ramamurthy and S.S. Kapoor, Phys. Rev. C32, 2182 (1985)
H.J. Krappe et al., Z. Phys. A314, 23 (1983)
H.J. Krappe, J.R. Nix and A.J. Sierk, Phys. Rev. C20, 992 (1979)
A.J. Sierk, Phys. Rev. C33, 2039 (1986)
L.C. Vaz and J.M. Alexander, Phys. Rep. 97, 1 (1983)
J.P. Blocki, H. Feldmeier, W.J. Swiatecki, Nucl. Phys. A459, 145 (1986)
J.F. Ziegler, J.P. Biersack, U. Littmark, The Stopping and Range of Ions in Matter, Pergamon Press, New York (1985)
S.B. Kaufman et al., Nucl. Instr. and Meth. 115, 47 (1974)
W. Bohne et al., Nucl. Instr. and Meth. A240, 145 (1985)
R. Bass, Phys. Rev. Lett. 39, 265 (1977)
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© 1988 Springer-Verlag
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Rossner, H., Erxmeyer, J., Hilscher, D., Lehmann, M. (1988). Intimations of non-compound fission at near-barrier energies. In: Signorini, C., Skorka, S., Spolaore, P., Vitturi, A. (eds) Heavy Ion Interactions Around the Coulomb Barrier. Lecture Notes in Physics, vol 317. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-50578-4_22
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DOI: https://doi.org/10.1007/3-540-50578-4_22
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