Experimental cross sections for reactions of heavy ions and lead-208, bismuth-209, uranium-238, and curium-248 targets.

摘要

The study of the reactions between heavy ions and 208Pb, 209Bi, 238U, and 248Cm targets was performed to look at the differences between the cross sections of hot and cold fusion reactions. Experimental cross sections were compared with predictions from statistical computer codes to evaluate the effectiveness of the computer code in predicting production cross sections.; Hot fusion reactions were studied with the MG system, catcher foil techniques and the Berkeley Gas-filled Separator (BGS). 3n- and 4n-exit channel production cross sections were obtained for the 238U(18O,xn) 256−xFm, 238U(22Ne,xn) 260−xNo, and 248Cm(15N,xn) 263−xLr reactions and are similar to previous experimental results. The experimental cross sections were accurately modeled by the predictions of the HIVAP code using the Reisdorf and Schädel parameters and are consistent with the existing systematics of 4n exit channel reaction products.; Cold fusion reactions were examined using the BGS. The 208Pb( 48Ca,xn)256−xNo, 208Pb( 50Ti,xn)258−xRf, 208Pb( 51V,xn)259−xDb, 209Bi( 50Ti,xn)259−xDb, and 209Bi( 51V,xn)260−xSg reactions were studied. The experimental production cross sections are in agreement with the results observed in previous experiments. It was necessary to slightly alter the Reisdorf and Schädel parameters for use in the HIVAP code in order to more accurately model the experimental data. The cold fusion experimental results are in agreement with current 1n- and 2n-exit channel systematics.