Abstract

Precise measurements of the K X-ray energy spectrum of muonic hydrogen ( μ −p) were made at H 2 gas pressures between 0.25 and 150 torr ( T = 300 K). The measured intensity ratios I( K α) I( K tot) and I ( K β) I( K γδ…) are compared with the results of new cascade calculations. The pressure dependence of the relative ( μp) 2 s population was investigated. Its value is (4.24 ± 0.14)% at 10 torr and (2.21 ± 0.22)% at 0.25 torr.

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