Abstract
Abstract The 39K(γ, n)38mK cross section has been measured with moderate resolution (800 keV) by detecting annihilation radiation from the 0.95 s decay of the residual nucleus. Between threshold and 29 MeV, resonances are observed with widths of the order of 1 MeV. This structure is compared to predictions of a shell-model calculation in the Tamm-Dancoff approximation. A d 3 2 hole is coupled to the 1− (T = 1) 1p-lh excitations of a 40Ca core and the hole excitations, 1 p 1 2 −1 and 1 p 3 2 −1 , are allowed. Results for zero-range and finite-range residual interactions both describe the low-energy side of the giant resonance remarkably well but give too little strength at higher energies. The zero-range force provides some explanation for the strong resonance observed at 22.2 MeV. The theory is compared also with the O'Connell isospin sum rule.
Published Version
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