Angular Distribution of Protons from (d, p) Reactions onBe9,N14, andZn68

Abstract

The ($d, p$) stripping theory of Butler has been employed in the interpretation of the angular distributions of protons resulting from the bombardment of foil targets of ${\mathrm{Be}}^9$, ${\mathrm{N}}^{14}$, and ${\mathrm{Zn}}^{68}$ by 11.9-Mev deuterons. A NaI(Tl) scintillation counter was used to detect protons emitted between angles of 5° and 90°, and pulses were recorded on a 35-mm film strip for pulse height analysis. The distribution of protons from the reaction ${\mathrm{N}}^{14}(d, p){\mathrm{N}}^{15}$ leaving ${\mathrm{N}}^{15}$ in its doublet first excited state was found to have a peak in the forward direction, indicating that the conclusion previously reached, i.e., that high momentum transfers are involved in this reaction, is probably incorrect. Although it was not possible to do so in the present work, it appears that stripping theory might be used to account for the proton distribution from this reaction if deuterons of higher energy were used. The orbital momenta of a pair of isomeric levels in the nucleus ${\mathrm{Zn}}^{69}$ as determined from the proton distributions and stripping theory are in agreement with the shell model assignments of $p_{\frac{1}{2}}$ for the ground state and $g_{\frac{9}{2}}$ for the 436-kev level. Higher excited levels of ${\mathrm{Zn}}^{69}$ are indicated at about 770 kev and 1.6 Mev. The distribution of the proton group leaving the final nucleus with an excitation of 770 kev is characterized by a momentum transfer, $l_n=2\mathrm{}$. The $Q$ value for the reaction leaving ${\mathrm{Zn}}^{69}$ in the ground state was determined to be 4.16±0.15 Mev.