K-shell ionization in the electron and positron decays of /sup 64/Cu

Journal Article · Tue Jan 01 04:00:00 EST 1980 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.21.348· OSTI ID:5633763

Schupp, G; Freedman, M S

The total K-ionization probabilities accompanying the ..beta../sup +/ and ..beta../sup -/ decays of /sup 64/Cu, P/sub K/(..beta../sup +/), and P/sub K/(..beta../sup -/) were determined from coincidence and singles K x-ray spectra of Ni and Zn to be (13.2 +- 0.8) x 10/sup -4/ and (11.9 +- 0.8) x 10/sup -4/, respectively, using a high resolution Si(Li) photon spectrometer. P/sub K/(..beta../sup +/)/P/sub K/(..beta../sup -/) was measured directly and independently to be 1.26 +- 0.10, in fair agreement with the ratio of the separate measurements 1.11 +- 0.10. While the average ratio is in agreement with the shaking theory of Isozumi, Shimizu, and Mukoyama, the individual values are a factor of approx. 1.5 larger than their predictions. A similar approximately twofold excess over the Isozumi, Shimizu, and Mukoyama hydrogenic-wave-function-based predictions has been observed for almost all cases of K-shell shaking in ..beta../sup -/ decay, and now also for this first reported measurement in ..beta../sup +/ decay. The measured ratio is the first experimental evidence affirming the previously recognized and acknowledged error of a factor of 2 (excess) for shakeoff in ..beta../sup -/ decay (but not in ..beta../sup +/ decay) in the theory of Law and Campbell. No evidence was found for a postulated Ni K vacancy production mechanism, in which the positron annihilates with a K electron internal to the parent atom, exceeding a few percent of K shaking in positron decay.

• Research Organization: Physics Department, University of Missouri-Columbia, Columbia, Missouri 65211
• OSTI ID: 5633763
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651622* -- Nuclear Properties & Reactions
A=59-89
Experimental-- Radioactive Decay-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANNIHILATION
BASIC INTERACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY
BETA-PLUS DECAY RADIOISOTOPES
COINCIDENCE SPECTROMETRY
CONVERSION
COPPER
COPPER 64
COPPER ISOTOPES
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE DECAY
ELECTRON CAPTURE RADIOISOTOPES
ELECTRON-POSITRON INTERACTIONS
ELECTRONIC STRUCTURE
ELEMENTS
FUNCTIONS
HOURS LIVING RADIOISOTOPES
INNER-SHELL IONIZATION
INTERACTIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION
IONIZATION
IONIZING RADIATIONS
ISOTOPES
K CAPTURE
K SHELL
LEPTON-LEPTON INTERACTIONS
METALS
NICKEL
NUCLEI
ODD-ODD NUCLEI
PARTICLE INTERACTIONS
PROBABILITY
RADIATIONS
RADIOISOTOPES
TRANSITION ELEMENTS
WAVE FUNCTIONS
X RADIATION
ZINC