Shift and broadening of resonance lines of the antiprotonic helium atoms in liquid He-4

Abstract

The shift and broadening of the resonance lines in spectrum of the antiprotonic helium atoms $\bar{p}{\mathrm{He}}^{+}$ located in fluid and superfluid ${}^4$He have been calculated. The contributions to the shift and broadening from collective degrees of freedom in liquid ${}^4$He have been estimated using the phenomenological response function. Effects due to the interaction of $\bar{p}{\mathrm{He}}^{+}$ with a single ${}^4$He atom have been calculated in the quasistatic approximation using the experimental pair correlation function. It has been shown that an implanted $\bar{p}{\mathrm{He}}^{+}$ atom establishes a good probe of liquid helium properties, since this atom practically does not change the target structure.

12 pages, 4 figures, 2 tables

References in corpus (1)

• Two-photon laser spectroscopy of antiprotonic helium and the antiproton-to-electron mass ratio

Cited by in corpus (2)

• Proposed method for laser spectroscopy of pionic helium atoms to determine the charged-pion mass
• Shift and broadening of resonance lines of antiprotonic helium atoms in solid helium