Abstract
Delayed-neutron emission probabilities (P n ) have been measured for eighteen nuclides ranging from 9Li to 25F. Neutron-rich nuclides were produced by the reaction of 800-MeV p on a 232Th target at the LAMPF accelerator at Los Alamos National Laboratory. Recoil nuclides were individually identified as to their mass, nuclear charge, and ionic charge by use of the Time-of-Flight Isochronous (TOFI) spectrometer. The distribution of time intervals between the arrival of a specific ion and the subsequent detection of a neutron was determined. The P n was calculated from the total number of ions observed, the initial neutron count rate, the neutron counting efficiency, and the half-life. The technique is shown to be valid for half-lives ranging from 10 ms (15B) to 4 s (17N) and for P n values as low as 0.3% (13B). Delayed-neutron emission has been measured for 12Be, 14B, 17C, 18N, 21N, and 25F for the first time. A small branch for β-delayed two-neutron emission was observed in 15B (P 2 n = 0.4 ± 0.2%).
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