Proton resonance spectroscopy in 29P

Proton elastic scattering on 28Si was measured with good beam energy resolution in the proton energy range Ep = 1.4 to Ep = 3.75 MeV, and proton inelastic scattering on 28Si was studied from Ep = 3.0 to 3.75 MeV. A resonance not previously seen in the elastic scattering channel was observed at Ep = 2.287 MeV; the elastic width was measured to be 80 eV. The resonance at Ep = 3.102 MeV had been assigned Jπ = 5/2- from previous proton elastic and inelastic scattering data. From the present measurements the spin and parity of the resonance is Jπ = 7/2-. The capture yields were used to locate extremely weak resonances near Ep = 1.377 MeV and 2.630 MeV. Upper limits for the elastic widths of the resonances at Ep = 1.377 MeV and 2.630 MeV are 2 eV; this reduced the previous upper limits for the elastic widths by 3 orders of magnitude. The resonance at Ep = 2.630 MeV has an inelastic width of 10 eV. Spectroscopic factors for the resonances in 29P were compared with those for the levels in the parent nucleus 29 Si. Large Thomas-Ehrman shifts are observed for a number of the mirror levels