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

P. A. Voytas, C. Ternovan, Massimiliano 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 journalArticle

Abstract

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)
Number of pages1
JournalPhysical Review Letters
Volume88
Issue number1
DOIs
StatePublished - Jan 1 2002
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Voytas, P. A., Ternovan, C., Galeazzi, M., McCammon, D., Kolata, J. J., Santi, P., Peterson, D., Guimarães, V., Becchetti, F. D., Lee, M. Y., O'Donnell, T. W., Roberts, D. A., Shaheen, S., & Shaheen, S. (2002). Direct Measurement of the [Formula presented] Ratio in [Formula presented] Electron Capture. Physical Review Letters, 88(1). https://doi.org/10.1103/PhysRevLett.88.012501