Abstract:The reactions ssS(~, 7,)SeAr and e~S(~, 7)~Ar were investigated in the energy range E~ = 2.2-3.2 MeV. Five resonance states in SeAr (Ex = 8.9-9.5 MeV) and six in eSAr(Ex = 9.6-10.1 MeV) were found. The excitation energies and resonance strengths are reported. The spins and parities of most resonances showing a ground-state transition were determined from angular distribution measurements. The relative strengths of the J~ = 1-resonances in neAr and 8nAr indicate that the isobaric-spin selection rule for electric dipole transitions in self-conjugate nuclei is still effective in this mass region. The slowing-down factor for these transitions amounts to about ten. The seCl(p, 7)nnAr reaction for F~ = 0.4-1.0 MeV, leads to twenty SeAr levels in the excitation range covered in the s~S(u, 7')SeAr experiment. The yield curves of the two reactions are compared. Three s6Ar resonance levels are excited in both the (13, 7') and the (u, 7) reaction.

The shell model is used to investigate quantltahvely some odd-parity levels of nuclei m the range z~S-41Ca An inert z°-S core Is assumed w~th a residual two-particle interaction of the outer nucleons. Only one nucleon ~s considered to be in the lfff shell, while the others are m "the ld k shell. The interaction matrix elements are reduced to hnear expressions m 14 parameters (i e 12 two-particle interactions and two binding energies to the core)The numerical results are presented as they are obtained from fitting the 14 parameters to 60 nuclear level energies. From the values of these parameters the energies and spins of about 240 levels are derived. Though the root mean square dewat~on of the calculated energies from the experimental energies is about 0.5 MeV, most of the level orders are calculated correctly. In addthon, the energies of some 0 + levels are calculated from configurations containing two particles in the lf.~ shell. These level energies appear to have a larger spread around the experimental energies An expansion of the matrix elements of the effective interaction of one nucleon m the ldff and one m the lf~r shell m terms of lnteract~on moments shows that the mean two-body rateraction for the T = 0 case is attractive, with a significant quadrupole sphttmg; this agrees with a weak spin dependence of the effective nuclear forces. The mean two-body interaction for the T = 1 case is shghtly repulsive, the octupole sphttmg being the most significant one

With protons in the energy range Ep = 0.4-3.1 MeV, sixty-five resonances were found in the reaction ssCl(p, y)SrAr. About forty of these resonances were not reported earlier.The resonance energies and the resonance strengths are given. The gamma-ray spectra at the resonances were investigated with scintillation spectrometers. From single and coincidence spectra the gamma-ray branchings of most of the resonances and of thirteen lower SeAr levels were obtained. At some of the investigated resonances, gamma rays were observed from proton emission to the first and second excited state of 85CI.I NUCLEAR REACTIONS srCl(P, 7), E= 0.4--3.1 MeV; E measured a(Ev; E~), W-coin, y-branching, resonance parameters. Enriched target.