Low energy elastic scattering of protons from calcium 40
Rich, Wiley Foster
Class, C. M.
Master of Arts
The elastic scattering of protons,from Ca40 by Brown, Johnson and Class revealed two levels in Sc41 in the region between 1.0 MeV and 2.0 MeV bombarding energy. Several narrower states in this region were seen by Youngblood in his study of the Ca40 (p,y ) Sc41 reaction. Using much improved techniques, the elastic scattering data, were retaken, in order to assign definite values to two states seen previously by Johnson, and in an effort to see some of the states reported by Youngblood. A target making technique was devised which enabled relatively clean, quite thin targets to be made efficiently. Low initial oxygen content was the focal point of this endeavor. An excitation function from 1.0 MeV to 2.0 MeV bombarding energy was obtained at three angles, chosen to be compatible with the identification of / -values of the levels. This energy region corresponds to 2.07 MeV to 3.05 MeV excitation energy. The proton widths, values, and the energies were determined for the two states seen previously. Upper limits on widths were assigned the levels seen in the (p, Y), which were not detected here.