Abstract
Least-squares analysis of spontaneous-fission data obtained over the last four years from a californium sample produced in the November, 1952 thermonuclear test gives a spontaneous-fission half-life of 56.2±0.7 days in agreement with the astrophysical value of 55±1 days. Some comments are made on the neutron buildup in Type I supernovae and the influence of a possible double magic number, , , at on the yield curve near . An approximate spontaneous-fission half-life of 2× years for is deduced from a curium sample also produced in the November, 1952 thermonuclear test.
- Received 3 May 1957
DOI:https://doi.org/10.1103/PhysRev.107.1087
©1957 American Physical Society