Importance of the Breit interaction for calculation of the differential cross section for dielectronic recombination with one-electron uranium

Calculation of the differential cross section for dielectronic recombination with one-electron uranium within the framework of quantum electrodynamics is presented. The dielectronic recombination of nonpolarized and polarized incident electrons is considered. The polarization of the emitted photon is investigated. The contributions of the Breit interaction and the interference of the photon multipoles are studied.

Figure 1

The total cross section of the dielectronic recombination with one-electron uranium as a function of the kinetic energy of the incident electron is presented (in kbarn). The black curve denotes the full QED calculation and the red (dashed) curve denotes the calculation disregarding the Breit interaction.

Figure 2

The differential cross section ($d\sigma /d\Omega$, in barn/str) of dielectronic recombination of nonpolarized incident electrons with nonpolarized one-electron ions of uranium is presented. The graphs in the left column correspond to the full QED calculation of the differential cross section; the graphs in the right column present the calculation disregarding the Breit interaction.

Figure 3

The contribution of the higher multipoles to the differential cross section is presented. The left graph corresponds to the differential cross section ($d{\sigma }^{\prime }/d\Omega$, in barn/str) for the recombination of nonpolarized electrons with nonpolarized ions where only the dipole ($j_0=1$) term is taken into account. The right graph represents the relative contribution of the higher multipoles $\delta \sigma$ [see Eq. (31)].

Figure 4

The differential cross section ($d\sigma /d\Omega$, in barn/str) of dielectronic recombination of polarized ($\mu =+1/2$) incident electrons with polarized ($m_b=+1/2$) one-electron ions of uranium is presented. The other notations are the same as in Fig. 2.

Figure 5

The Stokes parameter describing the linear polarization $P_1$ [see Eq. (32)] is presented. The other notations are the same as in Fig. 2.

Figure 6

The Stokes parameter describing the linear polarization $P_2$ [see Eq. (33)] is presented. The other notations are the same as in Fig. 2.

Figure 7

The Stokes parameter describing the circular polarization $P_3$ [see Eq. (34)] is presented. The other notations are the same as in Fig. 2.

Figure 8

The differential cross section $[{\sigma }^{\prime }(\theta ={90}^{\circ })$, in barn/str] for photon emission at $0^{\circ }$ angle is presented. The other notations are the same as in Fig. 1.

Figure 9

The differential cross section $[{\sigma }^{\prime }(\theta ={90}^{\circ })$, in barn/str] for photon emission at ${90}^{\circ }$ angle is presented. The other notations are the same as in Fig. 1.

Figure 10

Asymmetry parameter $A$ [see Eq. (35)] is presented. The other notations are the same as in Fig. 1.