Isomers in three doubly odd Fr-At-Bi. alpha. -decay chains
- LISOL, Instituut voor Kern-en Stralingsfysica, K. U. Leuven, Celestijnenlaan 200D, B-3001 Leuven (Belgium)
The {sup 206}Fr{r arrow}{sup 202}At{r arrow}{sup 198}Bi, {sup 204}Fr{r arrow}{sup 200}At{r arrow}{sup 196}Bi, and {sup 202}Fr{r arrow}{sup 198}At{r arrow}{sup 194}Bi {ital a}-decay chains have been studied by standard spectroscopic techniques using an on-line isotope separator. All the studied doubly odd isotopes have at least two isomers, which decay by a combination of the following decay modes: {ital a} emission, {beta}{sup +}/EC (electron capture) decay, and internal transition (IT). The internal transition, a highly retarded {ital E}3, is the {ital j}-forbidden transition between the ({pi}{ital h}{sub 9/2}{direct product}{nu}{ital i}{sub 13/2}){sub 10}{sup {minus}} and the ({pi}{ital h}{sub 9/2}{direct product}{nu}{ital f}{sub 5/2}){sub 7}{sup +} states. The {ital B}({ital E}3) values of these IT's together with their energy behavior as a function of the neutron and proton number, compared to the energy difference between the 13/2{sup +}({nu}{ital i}{sub 13/2}) and 5/2{sup {minus}}({nu}{ital f}{sub 5/2}) states in the odd-mass Pb isotones, indicate that these proton-neutron-coupled states have a rather pure shell-model character.
- OSTI ID:
- 7199348
- Journal Information:
- Physical Review, C (Nuclear Physics); (United States), Vol. 46:4; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
Similar Records
Prolate and oblate band structures in odd-odd sup 186,188 Au
Spectroscopy and high-spin structure of {sup 209}Fr
Related Subjects
ASTATINE ISOTOPES
NUCLEAR DECAY
BISMUTH ISOTOPES
FRANCIUM ISOTOPES
ALPHA DECAY
ALPHA DECAY RADIOISOTOPES
BETA-PLUS DECAY
E3-TRANSITIONS
ELECTRON CAPTURE DECAY
HELIUM 4
INTERNAL CONVERSION
ISOMERIC NUCLEI
ODD-ODD NUCLEI
ALKALI METAL ISOTOPES
BETA DECAY
CONVERSION
DECAY
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MULTIPOLE TRANSITIONS
NUCLEI
RADIOISOTOPES
STABLE ISOTOPES
663210* - Ground-State Radioactivity- (1992-)
663580 - Nuclear Mass Ranges- A=190-219- (1992-)