The total (P, n) reaction cross sections, integrated over the 4~solid a~~le and summed, over all neutron groups, for Ti, 54Cr, and~Co have been measured as a function of proton energy in the energy range 3.0-4.9, 2.2-5.2, and 2.0-5.1 MeV in 5 keV steps, respectively.No strong isobaric analog resonances were seen in the data. The Quctuations in the excitation functions were analyzed to extract (F),, values using the "counting of maxima" method.The excitation functions, averaged over 100 keV energy interval reveal prominent intermediate width structures in the case of~Ti. All the three excitation functions were averaged over suitable energy intervals and compared with the total reaction cross sections calculated utilizing the optical model. The data on~Co and Cr agreed, while the data on 5 Ti indicated a marked discrepancy with these optical model calculations. In the latter case, detailed Hauser-Feshbach (HF) and Hauser-Feshbach-Moldauer (HFM) calculations were carried out. The HFM calculations fit the data quite well. The importance of 0(p, n) measurements in determining the imaginary potential of the optical model at sub-Coulomb energies has been indicated.NUCLEAR REACTIONS 5 Cr(P, n), E=2.2-5.2 MeV; 5 Ti(P, n), E=3.0-4.9MeV; 59co(p, zz), E=2-5.1 Mev measured o(L); extracted (1'), "; optical model and Hauser-Feshbach analyses.
Resonance spectroscopy of Si nucleus in the excitation energy range 14.22 to 15.02 MeVL Absolute differential cross sections for the elastic scattering of a particles from ' Mg have been measured as a function of bombarding energy between 4.18 and 5.14 MeV at angles corresponding to the c.m. angles 90', 125; 141, and 16T. The data have been analyzed using the multilevel multichannel expression of R matrix theory modified to replace the background hard sphere phase shifits by complex optical model phase shifts. These phase shifts have been obtained by fitting the averaged cross section with the optical model. This modification has resulted in reasonably good fits to excitation functions both in magnitude and shape. Twelve levels in the compound nucleus~S i have been identified and their spins, parities, and widths have been determined. The possibility of the 0+ levels being fragmented components of a quartet parent state has been discussed. NUCLEAR REACTIONSMg(e, n) E =4.18-5.14 MeV; measured o'(8, E), 8c= 90', 125', 141', 167'; Si levels, deduced I'~, y~, J~; modified two channelmultilevel R matrix analysis.
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