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 language | English (US) |
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Pages (from-to) | 4 |
Number of pages | 1 |
Journal | Physical Review Letters |
Volume | 88 |
Issue number | 1 |
DOIs | |
State | Published - 2002 |
ASJC Scopus subject areas
- Physics and Astronomy(all)