We have studied the lecture course performance of approximately 2500 students enrolled in general physics over a five-year period to determine the influence of laboratory enrollment on lecture course performance. A statistical analysis showed the major determinants of lecture performance to be the SAT math score, overall grade average, and lab enrollment, with a significant interaction between overall grade average and lab enrollment. The results show that grades of good and poor students were influenced very little, while those of intermediate students were helped significantly by concurrent lab enrollment.
An analysis of isobaric analogue resonances is performed to yield the Coulomb displacement energies. The resonances are produced in proton reactions on heavy nuclei. A discussion of the corrections to the resonance data is included. The Coulomb displacement energies can be fitted using the formula: AE c = Bi-\-B 2 Z/ A 1 '*, where Bi is found to be -1.032±0.056 MeV, and B 2 is 1.448^0.006 MeV. There is no evidence for shell, deformation, or pairing effects within the accuracy of this analysis; however, the effects that one would expect to find due to deformations are of the order of the errors in the experiment. The parameters obtained are compared with other measurements of Coulomb displacement energies.
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