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Beck BR, Becker JA, Beiersdorfer P, et al. Energy splitting of the ground-state doublet in the nucleus 229Th. Phys Rev Lett. 2007;98(14):142501doi: 10.1103/PhysRevLett.98.142501.
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. (2007). Energy splitting of the ground-state doublet in the nucleus 229Th. Physical review letters, 98(14), 142501. https://doi.org/10.1103/PhysRevLett.98.142501
Beck, B R, et al. "Energy splitting of the ground-state doublet in the nucleus 229Th." Physical review letters vol. 98,14 (2007): 142501. doi: https://doi.org/10.1103/PhysRevLett.98.142501
Beck BR, Becker JA, Beiersdorfer P, Brown GV, Moody KJ, Wilhelmy JB, Porter FS, Kilbourne CA, Kelley RL. Energy splitting of the ground-state doublet in the nucleus 229Th. Phys Rev Lett. 2007 Apr 06;98(14):142501. doi: 10.1103/PhysRevLett.98.142501. Epub 2007 Apr 05. PMID: 17501268.
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Phys Rev Lett. 2007 Apr 06;98(14):142501. doi: 10.1103/PhysRevLett.98.142501. Epub 2007 Apr 05.

Energy splitting of the ground-state doublet in the nucleus 229Th.

Physical review letters

B R Beck, J A Becker, P Beiersdorfer, G V Brown, K J Moody, J B Wilhelmy, F S Porter, C A Kilbourne, R L Kelley

Affiliations

  1. Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

PMID: 17501268 DOI: 10.1103/PhysRevLett.98.142501

Abstract

The energy splitting of the 229Th ground-state doublet is measured to be 7.6+/-0.5 eV, significantly greater than earlier measurements. Gamma rays produced following the alpha decay of 233U (105 muCi) 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-->0 keV).

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