### Abstract

Bound-state transitions in few-electron, heavy ions following radiative electron capture are studied within the framework of the density matrix theory and the multiconfiguration Dirac-Fock approach. Special attention is paid to the K α1 (1 s1/2 2 p3/2 P J=1,2 1,3 →1 s 1/2 2 S J=0 1) radiative decay of heliumlike uranium U90+ projectiles. This decay has recently been observed at the GSI facility in Darmstadt, giving rise to a surprisingly isotropic angular distribution, which is inconsistent with previous experiments and calculations based on a "one-particle" model. We show that the unexpected isotropy essentially results from the mutual cancellation of the angular distributions of the P11 → S01 electric dipole and P23 → S01 magnetic quadrupole transitions, both of which contribute to the K α1 radiation. Detailed computations on the anisotropy of the K α1 radiation have been carried out for a wide range of projectile energies and are compared to available experimental data.

Original language | English |
---|---|

Article number | 052710 |

Journal | Physical Review A |

Volume | 74 |

Issue number | 5 |

DOIs | |

Publication status | Published - 2006 |

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### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)

### Cite this

*Physical Review A*,

*74*(5), [052710]. https://doi.org/10.1103/PhysRevA.74.052710

**K α1 radiation from heavy, heliumlike ions produced in relativistic collisions.** / Surzhykov, Andrey; Jentschura, U.; Stöhlker, Thomas; Fritzsche, Stephan.

Research output: Article

*Physical Review A*, vol. 74, no. 5, 052710. https://doi.org/10.1103/PhysRevA.74.052710

}

TY - JOUR

T1 - K α1 radiation from heavy, heliumlike ions produced in relativistic collisions

AU - Surzhykov, Andrey

AU - Jentschura, U.

AU - Stöhlker, Thomas

AU - Fritzsche, Stephan

PY - 2006

Y1 - 2006

N2 - Bound-state transitions in few-electron, heavy ions following radiative electron capture are studied within the framework of the density matrix theory and the multiconfiguration Dirac-Fock approach. Special attention is paid to the K α1 (1 s1/2 2 p3/2 P J=1,2 1,3 →1 s 1/2 2 S J=0 1) radiative decay of heliumlike uranium U90+ projectiles. This decay has recently been observed at the GSI facility in Darmstadt, giving rise to a surprisingly isotropic angular distribution, which is inconsistent with previous experiments and calculations based on a "one-particle" model. We show that the unexpected isotropy essentially results from the mutual cancellation of the angular distributions of the P11 → S01 electric dipole and P23 → S01 magnetic quadrupole transitions, both of which contribute to the K α1 radiation. Detailed computations on the anisotropy of the K α1 radiation have been carried out for a wide range of projectile energies and are compared to available experimental data.

AB - Bound-state transitions in few-electron, heavy ions following radiative electron capture are studied within the framework of the density matrix theory and the multiconfiguration Dirac-Fock approach. Special attention is paid to the K α1 (1 s1/2 2 p3/2 P J=1,2 1,3 →1 s 1/2 2 S J=0 1) radiative decay of heliumlike uranium U90+ projectiles. This decay has recently been observed at the GSI facility in Darmstadt, giving rise to a surprisingly isotropic angular distribution, which is inconsistent with previous experiments and calculations based on a "one-particle" model. We show that the unexpected isotropy essentially results from the mutual cancellation of the angular distributions of the P11 → S01 electric dipole and P23 → S01 magnetic quadrupole transitions, both of which contribute to the K α1 radiation. Detailed computations on the anisotropy of the K α1 radiation have been carried out for a wide range of projectile energies and are compared to available experimental data.

UR - http://www.scopus.com/inward/record.url?scp=33751096497&partnerID=8YFLogxK

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U2 - 10.1103/PhysRevA.74.052710

DO - 10.1103/PhysRevA.74.052710

M3 - Article

VL - 74

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 5

M1 - 052710

ER -