Direct Measurement of the [Formula presented] Ratio in [Formula presented] Electron Capture

P. A. Voytas, C. Ternovan, M. Galeazzi, D. McCammon, J. J. Kolata, P. Santi, D. Peterson, V. Guimarães, F. D. Becchetti, M. Y. Lee, T. W. O'Donnell, D. A. Roberts, S. Shaheen, S. Shaheen

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The ratio of [Formula presented]- to [Formula presented]-shell electron captures in light nuclei is particularly sensitive to electron overlap and exchange effects. Calculations of these effects in [Formula presented] disagree by more than [Formula presented]. We report a measurement of the [Formula presented] ratio in [Formula presented], using a cryogenic microcalorimeter which clearly separates [Formula presented]- and [Formula presented]-shell captures. The obtained [Formula presented] ratio of 0.040(6) is less than half that of existing predictions for free [Formula presented]. The discrepancy is likely due to in-medium effects distorting the [Formula presented]-shell electron orbitals.

Original languageEnglish (US)
Pages (from-to)4
Number of pages1
JournalPhysical Review Letters
Issue number1
StatePublished - 2002
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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