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Title:
Energy Splitting of the Ground-State Doublet in the Nucleus Th229
Authors:
Beck, B. R.; Becker, J. A.; Beiersdorfer, P.; Brown, G. V.; Moody, K. J.; Wilhelmy, J. B.; Porter, F. S.; Kilbourne, C. A.; Kelley, R. L.
Affiliation:
AA(Lawrence Livermore National Laboratory, Livermore, California 94550, USA), AB(Lawrence Livermore National Laboratory, Livermore, California 94550, USA), AC(Lawrence Livermore National Laboratory, Livermore, California 94550, USA), AD(Lawrence Livermore National Laboratory, Livermore, California 94550, USA), AE(Lawrence Livermore National Laboratory, Livermore, California 94550, USA), AF(Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA), AG(NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA), AH(NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA), AI(NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA)
Publication:
Physical Review Letters, vol. 98, Issue 14, id. 142501 (PhRvL Homepage)
Publication Date:
04/2007
Origin:
APS
PACS Keywords:
gamma transitions and level energies, 220<, =A
DOI:
10.1103/PhysRevLett.98.142501
Bibliographic Code:
2007PhRvL..98n2501B

Abstract

The energy splitting of the Th229 ground-state doublet is measured to be 7.6±0.5eV, significantly greater than earlier measurements. Gamma rays produced following the alpha decay of U233 (105μCi) were counted in the NASA/electron beam ion trap x-ray microcalorimeter spectrometer with an experimental energy resolution of 26 eV (FWHM). A difference technique was applied to the gamma-ray decay of the 71.82 keV level that populates both members of the doublet. A positive correction amounting to 0.6 eV was made for the unobserved interband decay of the 29.19 keV state (29.19→0keV).
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