Chemistry Division Semiannual Report June through November 1959
High-energy studies of the (p, 2p) reaction in Zn68 and Fe57 are being carried out. The excitation functions for the reactions, Zn68(p, 2p)Cu67 and Fe57 (p, 2p)Mn56 are being measured from 400 Mev to 6.2 Bev. Preliminary results are shown in Table 1. The cross sections are calculated on the basis of a 10.7-mb cross section for the Al27 (p, 3pn)Na24 reaction used to monitor the proton beam. The yield of Mn52 from proton bombardments of natural iron is found to be approximately constant at 7 mb over the energy region 400 Mev to 4.0 Bev. Similarly, the yields of Cu61 and Cu64 from proton bombardment of natural zinc are constant at 17 mb and 13 mb, respectively, over the same energy region. Experiments are being carried out in an attempt to measure the cross section for the reaction Zn68 (π⁺, π⁺p)Cu67, using 310-Mev π⁺ produced at the 184-inch cyclotron. The meson beam, which is produced by 720-Mev protons incident on copper, has an intensity of about 106 π⁺ per min over a 3-in.-diameter circle. The total induced activity of Cu67 from zinc of natural isotopic composition is about 100 cpm as detected by an end-window gas-flow proportional counter. The target thickness is 600 mg/cm2, so that the mesons lose only about 5 Mev in passing through the target. Bombardment time is from 8 to 20 hours. Copper-67, half-life 61 hours, has been radiochemically detected, and experiments are being carried out to determine what part of the observed activity is due to the Zn68 (π⁺, π⁺p)Cu67 reaction and what part is due to the interaction of stray or secondary fast neutrons with Zn67 (4.1% abundant) to produce the (n, p) reaction or with Zn68 (18.6% abundant) to produce Cu67 via the (n, pn) reaction.
- Research Organization:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
- Sponsoring Organization:
- USAEC
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 877355
- Report Number(s):
- UCRL--9093
- Country of Publication:
- United States
- Language:
- English
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