Accession Number : AD0258253

Title :   ON NUCLEAR F5/2, P3/2, P1/2 LEVEL SPACINGS AND TRANSITION PROBABILITIES IN THE LEAD REGION

Corporate Author : NOBEL INST FOR PHYSICS STOCKHOLM (SWEDEN)

Personal Author(s) : BERGSTROM,I. ; HERRLANDER,C.J.

Report Date : 01 MAY 1961

Pagination or Media Count : 1

Abstract : A search for transitions of the type f5/2 to p1/2 and p1/2 to f5/2 has been made in Pb-205, Pb-203, Pb-201 and Hg-201. It is shown that this transition in Pb-205 has an energy of only 2.3 keV and goes directly to the f5/2 ground state. In Pb-203 the corresponding transition has an energy of 126 keV and a half-life of 75 + or - 3 ns. In Pb-201 and Hg-201 there was no evidence of a half-life longer than about 2 ns. It was essential to work out methods for a systematic search of half-lives in the ns-region in cases where the production of the nuclides to be studied leads to complicated mixtures of isotopes decaying by electron capture. Changes of the f5/2, p3/2 and p1/2 level spacings and transition probabilities with the nucleon number is studied and compared with theory. The agreement between experiments and the predictions of Kisslinger and Sorensen for Pb-205 and Pb-203 is shown to be fairly good. (Author)

Descriptors :   *ISOTOPES, *LEAD(METAL), *NUCLEAR ENERGY LEVELS, *SOLID STATE PHYSICS, ELECTRON CAPTURE, NUCLEAR PHYSICS, NUCLEAR REACTIONS, PROBABILITY, RADIOACTIVE DECAY

Distribution Statement : APPROVED FOR PUBLIC RELEASE