Abstract
The $^{86}\mathrm{Kr}(d,p)^{87}\mathrm{Kr}$ reaction leading to three strong low-lying states in $^{87}\mathrm{Kr}({d}_{\frac{5}{2}}\mathrm{g}.\mathrm{s}., 0.53 \mathrm{MeV}{s}_{\frac{1}{2}}, \mathrm{and} 1.47 \mathrm{MeV}{d}_{\frac{3}{2}})$ has been studied as a function of energy from 5.0 to 10.5 MeV at 100, 120, 140, and 160\ifmmode^\circ\else\textdegree\fi{} laboratory angles. The strong, unusually shaped threshold cusp observed in the $^{86}\mathrm{Kr}(d,p)^{87}\mathrm{Kr}$(${d}_{\frac{5}{2}}$ g.s.) excitation curve near 7.56 MeV, threshold of the $^{86}\mathrm{Kr}(d,n)^{87}\mathrm{Rb}^{A}$ (${d}_{\frac{5}{2}}$ isobaric analog resonance) reaction, is discussed in terms of its position in a systematic study and classification of such threshold effects, using simple quantitative physical considerations. The $^{86}\mathrm{Kr}$ data are fit with coupled-channel Born-approximation calculations.
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