Abstract
By means of photographic magnetic spectrometers located close to the heavy water moderated reactor, the following radioactive nuclei have been examined: (17.5 sec), (3.5 min), (58 min), (17 min), (69 sec), (26 min), (11.9 days), (1.8 hr), (12 min), (50 hr), (27.5 hr), (410 days), (>20 yr), (46.5 hr), (23.5 min), (1.7 yr), (14 min), (15 min), and (23.6 min). The 27.5-hour activity assigned to was discovered in this work. A new vacuum gate for the camera of the spectrometer permits the study of activities with half-lives as short as ten seconds. Energy level schemes for the product nuclei are proposed on the basis of a spectrographic analysis of the gamma-rays and also of coincidence and absorption measurements. Changes in spin and parity between many of the energy levels are determined from measurements of the ratios of the corresponding gamma-rays.
- Received 4 February 1952
DOI:https://doi.org/10.1103/PhysRev.86.775
©1952 American Physical Society