C. R. Westerfeldt

Amplitude correlations for inelastic proton scattering from44Ca

The magnitudes and relative signs of inelastic proton channel amplitudes were determined for three decay channels for 45 5/2+ resonances in49V. The reduced widths in each channel follow a Porter-Thomas distribution, but extremely large amplitude correlations are observed — for one pair of channel amplitudes the relative sign is positive for 43 of 45 resonances. These results provide the first direct test of the Krieger-Porter reduced width amplitude distribution.

Statistical properties of 3/2− resonances in45Sc and51Mn

Magnitudes and relative signs of reduced width amplitudes for two inelastic decay channels were obtained for 3/2− resonances in45Sc and51Mn. Width and amplitude correlations were determined, and the first large amplitude correlation has been observed forl=1 resonances over a broad energy range. These results are consistent with the large amplitude correlations previously observed for 3/2+ and 5/2+ resonances.

Statistical properties of 3/2+ resonances in49V

Amplitude and width correlations were determined for three decay channels for 30 3/2+ resonances in49V. Singles and coincidence measurements were employed in this first determination of relative signs of decay amplitudes for 3/2+ resonances. Very large amplitude and width correlations are observed.

Statistical properties of 5/2+ resonances in57Co

Magnitudes and relative signs of inelastic proton channel amplitudes were determined for three decay channels for 77 5/2+ resonances in57Co. Large correlations are observed between widths and between amplitudes. Separate amplitude and width correlation measurements provide a direct test of the assumed Gaussian distribution for amplitudes.

Amplitude and width correlations for 3/2+ resonances in57Co

Magnitudes and relative signs of amplitudes for three inelastic proton channels have been determined for 42 3/2+ resonances in57Co in the rangeEp=3.1–4.0 MeV. Amplitude and width channel correlations have been obtained for each pair of channels. One of the amplitude correlations is large and highly significant. Comparisons between these data and statistical theories of nuclear levels are presented for both widths and products of amplitudes; in general, agreement is good. The widths for one channel and amplitude products for one pair of channels appear energy-dependent, with most of the strength concentrated in the lowest 200 keV.

A Compton-suppressed spectrometer for studies of chaos in nuclei

Abstract One approach to studying chaos in quantum systems utilizes the statistical behavior of eigenvalues. Such analyses require data of very high quality, since both completeness and purity are essential. The design of a Compton-suppressed γ-ray spectrometer for the purpose of establishing a nearly complete level scheme in 30 P via the 29 Si(p, γ) reaction is described. Design criteria and implementation are discussed, and early results from the system are presented.

Entrance channel correlations for 2+ resonances inp+27Al

Angular distributions and excitation functions were measured for 30 2+ resonances in the39K(p,p0) and39K(p, α0) reactions. Partial reduced widths have been extracted for three proton channels; the relative signs of the reduced width amplitudes for two of these channels were also determined. Reduced widths are generally consistent with a Gaussian distribution for the reduced width amplitudes, but the amplitudes themselves are not. These data represent the first measurement of correlation coefficients in an entrance channel and suggest that the large correlations previously observed in exit channels are generic features of this mass region.