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13 results on '"Schneider, W. F."'

2. Contribution of alpha cluster exchange to elastic and inelastic 16O + 20Ne scattering

Author

Stock, Reinhard (Prof. Dr. Dr. h.c.), Jahnke, U., Hendrie, D. L., Mahoney, J., Maguire, C. F., Schneider, W. F. W., Scott, D. K., and Wolschin, G.

Subjects
ddc:530
Abstract

Angular distributions for elastic and inelastic transitions in 20Ne + 16O scattering have been measured at E(20Ne)=50 MeV. For the 0+, 2+, and 4+ members of the 20Ne ground-state rotational band, the angular distributions exhibit pronounced backward peaking characteristic of an alpha -cluster exchange mechanism. The analysis of the ground-state transition in the first-order elastic transfer model yields no satisfactory fit although microscopic cluster form factors and full recoil corrections are employed. A coupled channels calculation for the 0+, 2+, and 4+ transitions reveals very strong coupling effects, indicating that the coherent superposition of first-order optical model and distorted-wave Born-approximation amplitudes may not be an adequate model for these reactions. NUCLEAR REACTIONS 16O(20Ne, 16O) and 16O(20Ne, 20Ne), elastic and inelastic transfer; E=50MeV; measured sigma (Ef , theta ); optical model + DWBA, and CCBA analyses.

Published
2005

6. Attempts to produce superheavy elements by fusion of 48Ca with 248Cm in the bombarding energy range of 4.5–5.2 MeV/u

Author

Yk, Agarwal, von Gunten, H., Agarwal, Y. K., Jp, Dufour, Poppensieker, K., Brüchle, W., Gaggeler, H., Reisdorf, W., Fp, Hessberger, Schädel, M., Schmidt, Kh H., Armbruster, P., Schneider, J. H. R., Schneider, W. F. W., Sümmerer, K., Schadel, M., Vermeulen, D., Wirth, G., Jh, Schneider, Ghiorso, A., Gregorich, K. E., Wf, Schneider, Lee, D., Wirth, aG, Leino, M., Moody, K. J., Brügger, M., Seaborg, G. T., Ke, Gregorich, Welch, R. B., Wilmarth, P., Kj, Moody, Yashita, S., Frink, C., Gt, Seaborg, Greulich, N., Dufour, J. P., Herrmann, G., Gäggeler, H., Hickmann, U., Rb, Welch, Hildebrand, N., Hessberger, F. P., Kratz, J. V., Trautmann, N., Hofmann, S., Lemmertz, P., Daniels, W. R., Fowler, M. M., Jv, Kratz, Münzenberg, G., Trautman, N., Hoffman, D. C., Dornhöfer, H., Von Gunten, H. R., Mm, Fowler, Dc, Hoffman, Wr, Daniels, and Hr, von Gunten

Abstract

A search for superheavy elements which are expected to occur around the predicted nuclear shell closures at atomic number 114 and neutron number 184 was made in bombardments of 248Cm with 48Ca ions. We have carried out this search at energies close to the Coulomb barrier to keep the excitation energy of the compound nucleus Z = 116, A = 296 as low as possible. The experiments were performed at the accelerators SUPERHILAC (Lawrence Berkeley Laboratory (LBL)) and UNILAC (GSI) and used a variety of improved physical and chemical techniques for the isolation and detection of superheavy elements to increase the sensitivity relative to earlier experiments. The small-angle separator system (SASSY) at LBL and the separator for heavy-ion reaction products (SHIP) at GSI were used for shortlived nuclides, and several radiochemical techniques were applied for longer half-lives. Although a broad range of half-lives, 10−6 to 108 s, and excitation energies, 16 to 40 MeV, has been examined, no evidence for the formation of superheavy elements with cross sections greater than 10−34 to 10−35 cm2 was found.

Published
1985

11. Model-based design of catalysts

Author

Nicholas Delgass, W., Abu-Omar, M., Caruthers, J. M., Ribeiro, F., Schneider, W. F., Thomson, K. T., Medvedev, G., Wang, J., Clay, J., Jones, M., Lee, W. -S, Pazmino, J., Sabnis, K., Shakhar, M., Stephen Stamatis, Switzer, J. M., Keith Steelman, D., Travia, N., Damion Williams, W., and Xiong, S.

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