Abstract
Four -decay chains initiated by , , , and were produced by the bombardment of thallium, lead, and bismuth targets with beams of , , , , , , and at the Berkeley heavy-ion linear accelerator. The reaction products were transported from the reaction cell by the helium-jet technique and their decay was measured with a semiconductor detector. Energy values, excitation functions, half-lives, and genetic relationships of individual peaks were determined. Two new techniques based on the use of a time-to-amplitude converter were developed for the measurement of μsec half-lives of daughter products, and five half-lives in the μsec range were measured.
These new data help to determine the trends in -decay energies for isotopes of odd- elements, particularly in the poorly defined region just above the 126-neutron shell. This allows more accurate predictions of -decay properties of many unknown nuclei. Some anomalous behavior of the apparent -decay energies for nuclei with 133 and 135 neutrons is pointed out.
- Received 11 May 1970
DOI:https://doi.org/10.1103/PhysRevC.2.1841
©1970 American Physical Society