Measurement of some level-widths in 40Ca between 9.5 and 10.5 MeV

The total widths of two excited states at 9603.9 keV, 10321.0 keV and of a doublet at 9864.6, 9868.9 keV in 40Ca have been measured with resonance γ-ray absorption. The gamma radiations from 39K (p, γ) reaction at Ep = 1307.2 keV, 2042.8 keV and 1595.0 keV have been selected to excite the corresponding levels in 40Ca. The accurate results for the widths of the 9603.9 keV and 10321.0 keV states are obtained for the first time, they are 188 ± 47 eV and 91 ± 15 eV, respectively. For the 9864.6 and 9868.8 keV states, they are 100 ± 24 eV and 899 ± 214 eV. Because the 9864.6 and 9868.8 keV states are close-lying doublet, the resonance γ-ray absorption techniqque was used in a special style: there will be two groups of gamma rays to be used to excite the same two levels, so the cross excitation occurs. We extended the corresponding experimental analysis. In addition, (p, γ) yield measurements have been made to extract the level widths of the 9603.9 keV, 10321.0 keV states. And the results are in agreement with the values deduced from resonance γ-ray absorption. The (p, γ) resonance strengths and isospins of the 9603.9 keV and 10321.0 keV states in 40Ca have also been discussed