Abstract
The preequilibrium emission of nucleons from reactions induced by medium-energy heavy ions is analyzed by using (i) the first term of the Griffin-exciton-model expansion and (ii) the modified Harp-Miller-Berne equilibration model. It is shown that both models account well for the high-energy component of angle-integrated emission spectra. The values of the relevant parametern 0 (initial number of degrees of freedom which share the available energy), obtained from the analysis with the two models, are practically equal for each reaction studied. The best-fit values ofn 0 depend on the incident energy. This behaviour is a novel feature of preequilibrium emission mechanisms in heavy-ion reactions, hitherto unobserved in light-ion reactions.
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Stöcker, H., Maruhn, J.A., Greiner, W.: Phys. Rev. Lett.44, 725 (1980)
Amsden, A.A., Goldhaber, A.S., Harlow, F.H., Nix, J.R.: Phys. Rev. C17, 2080 (1978)
Bondorf, J.P.: J. Phys. G5, 195 (1976)
Blann, M.: Annu. Rev. Nucl. Sci.25, 123 (1975)
Gavron, A., Beene, J.R., Ferguson, R.L., Obenshain, F.E., Plasil, F., Young, G.R., Petitt, G.A., Young, K.G., Jääskeläinen, M., Sarantites, D.G., Maguire, C.F.: Phys. Rev. C24, 2048 (1981)
Young, K.G., Sarantites, D.G., Beene, J.R., Halbert, M.L., Hensley, D.C., Dayras, R.A., Barker, J.H.: Phys. Rev. C23, 2479 (1981)
Awes, T.C., Poggi, G., Gelbke, C.K., Back, B.B., Glagola, B.G., Breuer, H., Viola, V.E., Jr.: Phys. Rev. C24, 89 (1981)
Holub, E., Hilscher, D., Ingold, G., Jahnke, U., Orf, H., Rossner, H.: Phys. Rev. C28, 252 (1983)
Griffin, J.J.: Phys. Rev. Lett.17, 478 (1966)
Griffin, J.J.: Phys. Lett.24B 5 (1967)
Harp, G.D., Miller, J.M., Berne, B.J.: Phys. Rev.165, 1166 (1968)
Harp, G.D., Miller, J.M.: Phys. Rev. C3, 1847 (1971)
Blann, M.: Phys. Rev. C23, 205 (1981)
Le Coutuer, K.L., Lang, D.W.: Nucl. Phys.13, 32 (1959)
Lang, D.W.: ibid,53, 113 (1964)
Watt, B.E.: Phys. Rev.87, 1037 (1952)
Weisskopf, V.: Phys. Rev.52, 295 (1937)
Birattari, C., Gadioli, E., Grassi-Strini, A.M., Strini, G., Tagliaferri, G., Zetta, L.: Nucl. Phys. A166, 605 (1971)
Gadioli, E., Gadioli-Erba, E., Sona, P.G.: Nucl. Phys. A217, 589 (1973)
Blann, M.: Phys. Rev. Lett.28, 757 (1972)
Morison, W.W., Samaddar, S.K., Sperber, D., Zielinska-Pfabe: Phys. Lett.93B 279 (1980)
Mooney, P., Morison, W.W., Samaddar, S.K., Sperber, D., Zielinska-Pfabe, M.: ibid98B 240 (1981)
Gavron, A., Beene, J.R., Cheynis, B., Ferguson, R.L., Obenshain, F.E., Plasil, F., Young, G.R., Petitt, G.A., Maguire, C.F., Sarantites, D.G., Jääskeläinen, M., Geoffroy-Young, K.: Phys. Rev. C27, 450 (1983)
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The authors are indebted to D. Hilscher for useful suggestions during the analysis.
The analysis with the modified HMB model was performed using the code RELAX written by M. Blann and G.D. Harp, kindly given to D. Hilscher by M. Blann.
One of the authors (E.H.) wishes to acknowledge a financial grant from the Internationales Büro KFA Jülich that was partly used for completing this work.
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Holub, E., Korolija, M. & Cindro, N. Preequilibrium emission of nucleons from reactions induced by medium-energy heavy ions. Z Physik A 314, 347–355 (1983). https://doi.org/10.1007/BF01412931
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DOI: https://doi.org/10.1007/BF01412931