Proton Angular Distributions fromZn64,66,67,68(d, p)Reactions

Abstract

Angular distributions and $Q$ values were determined for proton groups from ($d, p$) reactions with isotopically enriched targets of ${\mathrm{Zn}}^{64}$, ${\mathrm{Zn}}^{66}$, ${\mathrm{Zn}}^{67}$, and ${\mathrm{Zn}}^{68}$. The incident deuteron energy was 10 Mev. The angular distributions were fitted by Butler curves, from which values of $l_n$ were determined, where $l_n\hslash$ is the orbital angular momentum of the captured neutron. The fits were only fair, presumably because the Butler theory cannot be expected to give good fits at $Z=30\mathrm{}$ without modification. In addition, several peaks are evidently superpositions of closely spaced, unresolved groups with different $l_n$. Well-resolved empirical distributions which appear to correspond to $l_n=0, 1, 2, 3, \mathrm{and} 4$ were observed; these serve to indicate in which direction the Butler curves should be shifted, thus increasing confidence in the correctness of the values of $l_n$ which were assigned. For ${\mathrm{Zn}}^{64}(d, p)$ we find $Q=5.71\mathrm{}$ Mev with $l_n=1\mathrm{} \mathrm{and} 3$, $Q=4.89\mathrm{}$ Mev with $l_n=1\mathrm{} \mathrm{and} 3 or 4$, $Q=4.43\mathrm{}$ Mev with $l_n=2\mathrm{}$, $Q=3.86\mathrm{}$ Mev with $l_n=0\mathrm{}$, and $Q=3.31\mathrm{}$ Mev with $l_n=\mathrm{perhaps} 2 \mathrm{and} 4$. For ${\mathrm{Zn}}^{66}(d, p)$ the results were $Q=4.76\mathrm{}$ Mev with $l_n=1\mathrm{} \mathrm{and} 3$, $Q=4.38\mathrm{}$ Mev with $l_n=1\mathrm{} \mathrm{and} 3 or 4$, $Q=3.85\mathrm{}$ Mev with $l_n=2\mathrm{}$, and $Q=3.15\mathrm{}$ Mev with $l_n$ uncertain. For ${\mathrm{Zn}}^{67}(d, p)$ we find $Q=8.01\mathrm{}$ Mev with $l_n=3\mathrm{}$, $Q=6.90\mathrm{}$ Mev with $l_n=1\mathrm{}$, $Q=6.13\mathrm{}$ Mev with $l_n$ unknown, and $Q=4.52\mathrm{}$ Mev with $l_n=\mathrm{perhaps} 1 \mathrm{and} 3$. For ${\mathrm{Zn}}^{68}(d, p)$ the results were $Q=4.22\mathrm{}$ Mev with $l_n=1\mathrm{}$, $Q=3.78\mathrm{}$ Mev with $l_n=4\mathrm{}$, and $Q=3.40\mathrm{}$ with $l_n=2\mathrm{}$.