A neutron detector having approximately uniform sensitivity from a few kUovolts neutron energy to a few million volts energy is described. The arrangement known as a long counter consists of a paraffin cylinder about 10 inches outer diameter x 12 inches long surrounding a long boron proportional counter. Sensitivity curves are given for two of the best arrangements. The response is flat over the above range to about 10%.
We report a result of (1 ±4) xlO" 7 for the parity-nonconserving component in the p-p nuclear cross section at 15 MeV. Our experiment uses rapid spin reversal of a longitudinally polarized proton beam and an unpolarized H 2 target. Sources of systematic error are discussed and found to be <10" 7 .
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