In view of recent interest in the Cl37 (ʋ solar’e-)Ar37 reaction cross section, information on some aspects of mass 37 nuclei has been obtained using the K39 (d, ∝) Ar37 and Cl35 (He3, p) Ar37 reactions.Ar37 levels have been found at 0, 1.41, 1.62, 2.22, 2.50, 2.80, 3.17, 3.27, 3.53, 3.61, 3.71, (3.75), (3.90), 3.94, 4.02, (4.21), 4.28, 4.32, 4.40, 4.45, 4.58, 4.63, 4.74, 4.89, 4.98, 5.05, 5.10, 5.13, 5.21, 5.35, 5.41, 5.44, 5.54, 5.58, 5.67, 5.77, and 5.85 MeV (the underlined values correspond to previously tabulated levels).The nuclear temperature calculated from the Ar37 level density is 1.4 MeV.Angular distributions of the lowest six levels with the K39 (d, ∝) Ar37 reaction at Ed = 10 MeV indicate a dominant direct interaction mechanism and the inapplicability of the 2I + 1 rule of the statistical model.Comparison of the spectra obtained with the K39 (d, ∝) Ar37 and Cl35 (He3, p) Ar37 reactions leads to the suggestion that the 5.13-MeV level is the T = 3/2 Cl37 ground state analog.The ground state Q-value of the Ca40 (p, ∝) K37 reaction has been measured: -5179 ± 9 keV.This value implies a K37 mass excess of -24804 ± 10 keV.Description of a NMR magnetometer and a sixteen-detector array used in conjunction with a 61-cm double-focusing magnetic spectrometer are included in appendices.
