Measurement of the K-line intensity ratios in muonic hydrogen between 0.25 and 150 torr gas pressures

Abstract

Precise measurements of the K X-ray energy spectrum of muonic hydrogen (μ⁻p) were made at H₂ gas pressures between 0.25 and 150 torr (T = 300 K). The measured intensity ratios $\text{I(}\text{K}{}_{\mathrm{\alpha }}\text{)}\text{I(}\text{K}{}_{\mathrm{tot}}\text{)}$ and $\text{I}\text{(}\text{K}{}_{\mathrm{\beta }}\text{)}\text{I(}\text{K}{}_{\mathrm{\gamma \delta \dots }}\text{)}$ are compared with the results of new cascade calculations. The pressure dependence of the relative (μp)_2s population was investigated. Its value is (4.24 ± 0.14)% at 10 torr and (2.21 ± 0.22)% at 0.25 torr.