Abstract
Subthreshold ¯p andK − and energeticπ − production was studied in Ne + NaF, Cu, Sn and Bi, and in Ni + Ni collisions with incident energies between 1.6 and 2 GeV/u. The measured cross sections indicate a dominant contribution of baryonic resonances. This is also consistent with a generalized scaling behaviour of the cross sections with the energy available in the collision and the energy necessary to produce particles as observed with Ne induced reactions. Deviations from scaling especially pronounced in the Ni-Ni system will be discussed in terms of absorption effects. The flat slope of the excitation function for ¯p production can be related to a reduced production threshold caused by a reduction of the antiproton mass in the dense and heated medium by about 100—150 MeV/c2. A similar in-medium mass reduction is also indicated forK − mesons. An increased ¯p reabsorption probability for the heavier systems is concluded from the comparison of the ¯p yields in Ne + NaF, Ne + Sn and Ni + Ni collisions.
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Cassing, W., Metag, V., Mosel, U., Niita, K.: Phys. Rep.188, 363 (1990)
Mosel, U.: Annu. Rev. Nucl. Part. Sci.41, 29 (1991)
Shor, A., et al.: Phys. Rev. Lett.63, 2192 (1989)
Baldin, A.A., et al.: JETP Lett.47, 137 (1988)
Shor, A., Perez-Mendez, V., Ganezer, K.: Nucl. Phys.A514, 717 (1990)
Dorfan, D.E., et al.: Phys. Rev. Lett.14, 995 (1965)
Danielewicz, P.: Phys. Rev. C42, 1564 (1990)
Koch, P., Dover, C.B.: Phys. Rev. C40, 145 (1989)
Ko, C.M., Ge, X.: Phys. Lett. B205, 195 (1988); Ko, C.M., Xia, L.H.: Phys. Rev. C40, R1118 (1989)
Lang, A., Blättel, B., Koch, V., Weber, K., Cassing, W., Mosel, U.: Phys. Lett. B245, 147 (1990)
Batko, G., Cassing, W., Mosel, U., Niita, K., Wolf, Gy.: Phys. Lett. B256, 331 (1991)
Huang, S.W., Li, G.Q., Maruyama, T., Faessler, A.: Nucl. Phys. A547, 653 (1992)
Teis, S., Cassing, W., Maruyama, T., Mosel, U.: Phys. Lett. B319, 47 (1993); Teis, S., Cassing, W., Maruyama, T., Mosel, U.: (submitted to Phys. Rev. C)
Ahner, W., et al.: Z. Phys. A341, 123 (1991)
Berg, F.D., et al.: Z. Phys. A337, 351 (1990)
Walcher, T.: Annu. Rev. Nucl. Part. Sci.38, 67 (1989)
Amsler, C.: Annu. Rev. Nucl. Part. Sci.41, 219 (1991)
Geissel, H., et al.: Nucl. Instrum. Methods B70, 286 (1992)
Schröter, A., Koenig, W., Berdermann, E., Kienle, P., Stroher, H., Homolka, J., Schumacher, F.: GSI Scientific Report 91–1, 293 (1991); Schröter, A.: GSI Report 93-33, 1 (1993)
Ziegler, C., Brohm, T., Clerc, H.-G., Geissel, H., Schmidt, K.-H., Sümmerer, K., Vieira, D.J., Voss, B.: GSI Scientific Report 91-1, 291 (1991)
Flaminio, V., Moorhead, W.G., Morrison, D.R.O., Rivoire, N.: CERN-HERA Report 84–01, 147 (1984)
Shor, A.: Phys. Lett. B274, 11 (1992)
Nakai, N., Kobayashi, T., Numao, T., Shibata, T.A., Chiba, J., Masutani, K.: Phys. Rev. Lett.44, 1446 (1980)
Afonas'ev, V.N., et al.: Sov. J. Nucl. Phys.47, 1049 (1988)
Grosse, E.: Private communication (1992)
Senger, P., et al.: Nucl. Phys. A553, 757c (1993); Miśkowiec, D., et al.: (to be published in Phys. Rev. Lett.), Preprint GSI-94–28
Metag, V.: Nucl. Phys. A553, 283c (1993)
Batko, G., Faessler, A., Huang, S.W., Lehmann, E., Puri, R.K.: (to be published in J. Phys. G)
Li, G.Q., Ko, C.M., Fang, X.S., Zheng, Y.M.: Phys. Rev. C49, 1139 (1994); Li, G.Q., Ko, C.M.: (submitted to Phys. Rev. Lett.)
Li, G.Q., Ko, C.M., Fang, X.S.: (to be published in Phys. Rev. C)
Spieles, C., Jahns, A., Sorge, H., Stöcker, H., Greiner, W.: Mod. Phys, Lett. A8, 27 (1993)
Schröter, A., et al.: Nucl. Phys. A553, 775c (1992); Gillitzer, A., et al.: Proc. XXXI Int. Winter Meeting on Nucl. Phys., Bormio 1993, p. 546
Cassing, W., Teis, S.: Private communication (1992)
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Dedicated to Professor Klaus Dietrich on the occasion of his 60th birthday.
The authors acknowledge the support of the FRS group, especially of G. Münzenberg, K. Sümmerer, K.H. Behr, A. Brünle and K.H. Burkhard. The authors also express their thanks to W. Cassing, T. Maruyama, U. Mosel and S. Teis, A. Jahns, C. Spieles and H. Stöcker, and H.H. Wolter for fruitful discussions.
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Schröter, A., Berdermann, E., Geissel, H. et al. Subthreshold antiproton andK − production in heavy ion collisions. Z. Physik A - Hadrons and Nuclei 350, 101–113 (1994). https://doi.org/10.1007/BF01290678
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DOI: https://doi.org/10.1007/BF01290678