Abstract
We have measured for the 430 MeV86Kr+92.98Mo systems the triple differential cross sectiond 3 σ/dEdAdZ (E=kinetic energy,A=mass andZ=atomic number) of the reaction products in the angular range (θ=25, 45°). We focussed attention on a fast collective mode in deep inelastic reactions: the neutron excess or charge equilibration. This mode is shown to relax very quickly to equilibrium within a time scale of the order of 10−22s. It is shown that this collective degree of freedom exhibit a quantal behavior which can be seen in the observation of quantal fluctuations. The experimental results are discussed in terms of a simple equilibrium model. The giant dipole resonance of the composite system could be closely connected to this neutron excess mode.
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For a review see for instance: Lefort, M., Ngô, C.: Ann. Phys. Paris3, 5 (1978)
Péter, J., Berlanger, M., Ngô, C., Tamain, B., Lucas, B., Mazur, C., Ribrag, M., Signarbieux, C.: Z. Physik A283, 413 (1977)
Eyal, Y., Gavron, A., Tserruya, I., Fraenkel, Z., Eisen, Y., Wald, S., Bass, R., Gould, G., Kreyling, K., Rendfordt, R., Stelzer, K., Zitsmann, R., Gobbi, A., Lynen, U., Stelzer, H., Rode, I., Bock, R.: Phys. Rev. Lett.41, 625 (1978)
Tamain, B., Chechik, R., Fuchs, H., Hanappe, F., Morjean, M., Péter, J., Dakowsky, M., Lucas, B., Mazur, C., Ngô, C., Ribrag, M., Signarbieux, C.: IPNO-RC-79-02
Gatty, B., Guerreau, D., Lefort, M., Pouthas, J., Tarrago, X., Galin, J., Cauvin, B., Girard, J., Nifenecker, H.: Z. Physik A273, 65 (1975) and Nucl. Phys. A253, 511 (1975)
Kratz, J.V., Ahrens, H., Bögl, W., Brüchle, W., Franz, G., Schädel, M., Warnecke, I., Wirth, G., Klein, G., Weis, H.: Phys. Rev. Lett.39, 984 (1977)
Berlanger, M., Gobbi, A., Hanappe, F., Lynen, U., Ngô, C., Olmi, A., Sann, H., Stelzer, H., Richel, H., Rivet, M.F.: VII International Workshop, Hirschegg (1979)
Wirth, G., Brüchle, W., Geiggeler, H., Kratz, J.V., Schädel, M., Warnecke, I., Hermann, G., Weis, H., Lucas, R., Poitou, J.: VII International Workshop, Hirschegg (1979)
Chiang, T.H., Guerreau, D., Auger, P., Galin, J., Gatty, B., Tarrago, X., Girard, J.: IPNO-RC-79-01
Volkov, V.V.: Proc. of the Int. Conf. on reactions between complex nuclei, Nashville (1974) Robinson, R.L. et al. (eds.) vol. 2, 363. Amsterdam: North Holland 1974
Moretto, L.G., Sventek, J.S.: Phys. Rev.58B, 26 (1975)
Green, A.E.S., Engler, N.A.: Phys. Rev.91, 40 (1953)
We are grateful to Dr. Bohlen, Gebauer, Kluge, Siekmann and Von Oertzen for providing us with the92Mo and98Mo targets
Sann, H., Damjantschitsch, H., Hebbard, D., Junge, J., Pelte, D., Povh, B., Schwalm, D., Tran Thoai, D.B.: Nucl. Instr. and Meth.124, 509 (1975)
Martin, B., Stelzer, H.: GSI Bericht P-1-78 (1978)
Eyal, Y., Hilmann, M., Gavron, A.: Supervap-Julian code. We are grateful to B. Lagarde for her help in running the evaporation code
Moretto, L.G., Schmitt, R.P.: preprint LBL-77–57
Cauvin, B.: private communication
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Four of us (F.H., C.N., H.R. and M.F.R.) would like to acknowledge G.S.I. and Prof. R. Bock for the kind hospitality and financial support during their stay there. We are also grateful to Dr. H. Hofmann for stimulating discussions.
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Berlanger, M., Gobbi, A., Hanappe, F. et al. Study of a fast collective mode in deep inelastic reactions: Quantal fluctuations. Z Physik A 291, 133–143 (1979). https://doi.org/10.1007/BF01437993
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DOI: https://doi.org/10.1007/BF01437993