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Title: Corrections for Exchange and Screening Effects in Low-energy Beta Decays

The beta spectra of {sup 241}Pu and {sup 63}Ni have been recently measured using metallic magnetic calorimeters. This powerful experimental technique allows theoretical beta spectra calculations to be tested at low energy with an accuracy never before achievable. Their comparison with classical beta calculations exhibits a significant deviation below 4 keV for {sup 241}Pu and 8 keV for {sup 63}Ni. The atomic exchange effect explains the main part of this deviation in the {sup 63}Ni beta spectrum. This effect has a significant contribution, equivalent to the magnitude of the screening, in the {sup 241}Pu beta spectrum.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
22436703
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Data Sheets; Journal Volume: 120; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BETA DECAY; BETA SPECTRA; CALORIMETERS; KEV RANGE; NICKEL 63; PLUTONIUM 241