Abstract
For U89+ projectiles colliding at a beam energy of 75.91 MeV/u with a N2 target, we present a coincidence measurement between the cusp electrons emitted under an angle of 0∘ with respect to the projectile beam and the photons emitted under a polar angle of 90∘. This radiative-electron-capture-to-continuum cusp directly probes the theory of electron-nucleus bremsstrahlung up to the high-energy endpoint in inverse kinematics. In the present study, significant improvement with respect to the experimental accuracy has been achieved, resulting in a finer agreement between experimental and theoretical results.Received 10 December 2019Accepted 29 January 2020DOI:https://doi.org/10.1103/PhysRevA.101.022708Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasScattering of atoms, molecules, clusters & ionsScattering theoryAtomic, Molecular & Optical
Highlights
Electron-nucleus bremsstrahlung is one of the fundamental collision processes that lead to the emission of x rays
In this paper we have presented a measurement of the radiative electron capture to continuum (RECC) cusp in collisions of U89+ with a N2 target at a collision energy of 75.91 MeV/u
We find an improved agreement of our experimental data with the fully relativistic theory of electron-nucleus bremsstrahlung up to the high-energy endpoint
Summary
Electron-nucleus bremsstrahlung is one of the fundamental collision processes that lead to the emission of x rays. Corresponding experiments performed for high-energy electrons impinging on neutral atomic targets focused on the polarization of the emitted x rays, providing a good agreement with the theoretical calculations [18,19]. The study of electron-nucleus bremsstrahlung in coincidence measurements of emitted electrons and photons for the case of energetic electrons impinging on bare nuclei at rest exceeds current technical capabilities. The observables are the energy and the angle of the scattered electron and the emitted photon This process is termed radiative electron capture to continuum (RECC), in analogy to the radiative electron capture (REC), which is the capture of a quasifree target electron into a bound state of the projectile ion under emission of a photon [21]. Throughout the rest of the paper, primed variables refer to projectile frame centered around the U89+ ion, while unprimed variables refer to the target frame centered around the N2
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call