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4 results on '"Steckmeyer JC"'

1. Highest temperatures sustainable in heavy nuclei produced in Ar+Au collisions at 60 AMeV

Author

UCL - SC/PHYS - Département de physique, Lecolley, FR, Benoit, B, Bizard, G., Costa, G., Dorvaux, O., Durand, D., El Masri, Youssef, Guillaume, G., Gulminelli, F, Hanappe, F., Heusch, B., Huck, A., Keutgen, Thomas, Lebrun, C., Lefebvres, F, Louvel, M., Ninane, Alain, Regimbart, R., Rudolf, G, Steckmeyer, JC., Stuttge, L., Tamain, B., Tilquin, I., UCL - SC/PHYS - Département de physique, Lecolley, FR, Benoit, B, Bizard, G., Costa, G., Dorvaux, O., Durand, D., El Masri, Youssef, Guillaume, G., Gulminelli, F, Hanappe, F., Heusch, B., Huck, A., Keutgen, Thomas, Lebrun, C., Lefebvres, F, Louvel, M., Ninane, Alain, Regimbart, R., Rudolf, G, Steckmeyer, JC., Stuttge, L., Tamain, B., and Tilquin, I.

Abstract

The specific decay mode of hot nuclei surviving fission or fragmentation and leading in the final state to the production of a large residue has been studied in Ar+Au collisions at 60 A MeV. The temperature of these residues has been obtained by analysing the kinematical characteristics (angular and kinetic energy distributions) of the coincident neutrons detected by the DEMON neutron detector, A total cross section of 50 mb has been measured for the production of residues with an initial temperature of 6 MeV or more. This result is compared with the predictions of a microscopic transport model. (C) 1997 Elsevier Science B.V.

Published
1997

2. Directed collective flow and azimuthal distributions in Ar-36+Al-27 collisions from 55 to 95 MeV/u

Author

UCL - SC/PHYS - Département de physique, Angelique, JC., Buta, A., Bizard, G., Cussol, D., Peghaire, A., Peter, J., Popescu, R., Auger, G., Brou, R., Cabot, C., Crema, E., El Masri, Youssef, Eudes, P., He, ZY., Kerambrun, A., Lebrun, C., Regimbart, R., Rosato, E., StLaurent, F, Steckmeyer, JC., Tamain, B., Vient, E., UCL - SC/PHYS - Département de physique, Angelique, JC., Buta, A., Bizard, G., Cussol, D., Peghaire, A., Peter, J., Popescu, R., Auger, G., Brou, R., Cabot, C., Crema, E., El Masri, Youssef, Eudes, P., He, ZY., Kerambrun, A., Lebrun, C., Regimbart, R., Rosato, E., StLaurent, F, Steckmeyer, JC., Tamain, B., and Vient, E.

Abstract

A 4 pi charged particle detector array with a low velocity threshold has been used to detect the products from reactions induced by Ar-36 on Al-27 at energies ranging from 55 to 95 MeV/u. Well characterized events were selected and sorted as a function of the impact parameter. Two methods were used for sorting these events with respect to their impact parameters and three methods were compared to determine the reaction plane. The transverse momentum analysis has been found to be the best method to extract the direction of the reaction plane for this system and for the experimental set-up used here. The energy of vanishing flow for central collisions has been found to be around 90-95 MeV/u. The azimuthal distributions of mid-rapidity particles exhibit a preferential in-plane emission and no squeeze-out effect.

Published
1997

3. Properties of very hot nuclei formed in Zn-64+Ti-nat collisions at intermediate energies

Author

UCL - SC/PHYS - Département de physique, Steckmeyer, JC., El Masri, Youssef, UCL - SC/PHYS - Département de physique, Steckmeyer, JC., and El Masri, Youssef

Abstract

Formation and decay of hot nuclei have been studied in Zn-64 + Ti-nat collisions between 35 and 79 MeV/nucleon. The mass and excitation energy of excited quasiprojectiles are reconstructed from the kinematical characteristics of their decay products. In central collisions, excitation energies larger than 10 MeV/nucleon are reached. Comparisons with theoretical predictions indicate that a fraction of the excitation energy is associated with an isotropic radial flow.

Published
1996

4. Gamma-ray Multiplicity Measurements for the Determination of the Initial Angular-momentum Ranges in Normal and Fast Fission Processes

Author

UCL - SC/PHYS - Département de physique, El Masri, Youssef, Hanappe, F., Steckmeyer, JC., Martin, V., Bizard, G., Borderie, B., Brou, R., Bruandet, JF., Duhamel, P., Fuchs, H., Laville, JL., Peter, J., Regimbart, R., Rivet, M., Tamain, B., Chan, TU., UCL - SC/PHYS - Département de physique, El Masri, Youssef, Hanappe, F., Steckmeyer, JC., Martin, V., Bizard, G., Borderie, B., Brou, R., Bruandet, JF., Duhamel, P., Fuchs, H., Laville, JL., Peter, J., Regimbart, R., Rivet, M., Tamain, B., and Chan, TU.

Published
1990

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