Levels in /sub 84//sup 204/Po from the decay of /sub 85//sup 204/At

Journal Article · Sun May 01 04:00:00 EDT 1983 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.27.2248· OSTI ID:5978484

Helmer, R G; Reich, C W

The electron-capture decay of /sub 85//sup 204/At (9 min) has been studied by means of ..gamma.. and e/sup -/ multiscaled singles and ..gamma..-..gamma.. coincidence measurements with Ge(Li) and Si(Li) detector systems. The samples were produced by Ir(/sup 16/O, xn) reactions and on-line isotope separation. About 50 ..gamma..-ray transitions have been assigned to the /sup 204/At decay, approx.35 of which have been placed in a proposed level scheme for /sub 84//sup 204/Po. The energy of the 8/sup +/..-->..6/sup +/ isomeric transition has been deduced to be 12.1 keV, and the half-life of the 8/sup +/ isomer has been measured to be 150 +- 10 ns. From these data, the B(E2) value of this isomeric transition is found to be 3.7 Weisskopf units. The /sup 204/At ground state is assigned an I/sup ..pi../ value of 7/sup +/, which eliminates the need for some low-energy levels in /sup 204/At and /sup 200/Bi that were tentatively proposed in recent data evaluations, where a 5/sup +/ assignment was made.

• Research Organization: Idaho National Engineering Laboratory, EGandG Idaho, Incorporated, Idaho Falls, Idaho 83415
• OSTI ID: 5978484
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 27:5; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651922* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Radioactive Decay-- (-1987)
651923 -- Nuclear Properties & Reactions
A=190-219
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY RADIOISOTOPES
ASTATINE 204
ASTATINE ISOTOPES
BETA DECAY
BETA DECAY RADIOISOTOPES
COINCIDENCE SPECTROMETRY
DATA
DECAY
E2-TRANSITIONS
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
GAMMA RADIATION
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
INFORMATION
IONIZING RADIATIONS
ISOTOPES
LIFETIME
MINUTES LIVING RADIOISOTOPES
MULTIPOLE TRANSITIONS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
POLONIUM 204
POLONIUM ISOTOPES
RADIATIONS
RADIOISOTOPES