Radiative Electron Capture to the Continuum and the Short-Wavelength Limit of Electron-Nucleus Bremsstrahlung in $90A\text{ }\mathrm{MeV}$ ${\mathrm{U}}^{88+}(1{s}^{2}2{s}^{2})+{\mathrm{N}}_{2}$ Collisions

Radiative Electron Capture to the Continuum and the Short-Wavelength Limit of Electron-Nucleus Bremsstrahlung in $90 A MeV$ $U^{88 +} (1 s^{2} 2 s^{2}) + N_{2}$ Collisions

M. Nofal, S. Hagmann, Th. Stöhlker, D. H. Jakubassa-Amundsen, Ch. Kozhuharov, X. Wang, A. Gumberidze, U. Spillmann, R. Reuschl, S. Hess, S. Trotsenko, D. Banas, F. Bosch, D. Liesen, R. Moshammer, J. Ullrich, R. Dörner, M. Steck, F. Nolden, P. Beller, H. Rothard, K. Beckert, and B. Franczak

Phys. Rev. Lett. 99, 163201 – Published 18 October 2007

Abstract

We have measured the continuum momentum distribution for radiative electron capture to the continuum (RECC) cusp electrons in $90 A MeV$ $U^{88 +} + N_{2} \to U^{88 +} + {N_{2}^{+ *}} + e_{cusp} (0 °) + h ν$ (RECC) collisions. We demonstrate that x rays coincident with RECC cusp electrons originate from the short-wavelength limit of the electron-nucleus bremsstrahlung and explain the asymmetric cusp shape by comparison with theory within the relativistic impulse approximation.

Received 2 January 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.163201

Authors & Affiliations

M. Nofal^1,2,3, S. Hagmann^2,3,*, Th. Stöhlker³, D. H. Jakubassa-Amundsen⁴, Ch. Kozhuharov³, X. Wang⁵, A. Gumberidze³, U. Spillmann³, R. Reuschl³, S. Hess³, S. Trotsenko³, D. Banas³, F. Bosch³, D. Liesen³, R. Moshammer¹, J. Ullrich¹, R. Dörner², M. Steck³, F. Nolden³, P. Beller³, H. Rothard⁶, K. Beckert³, and B. Franczak³

¹Max Planck Institut für Kernphysik, D-69117 Heidelberg, Germany
²Institut für Kernphysik, Universität Frankfurt, D-60438 Frankfurt, Germany
³Gesellschaft für Schwerionenforschung GSI, D-64291 Darmstadt, Germany
⁴Mathematisches Institut, Ludwig-Maximilans-Universität, D-80333 München, Germany
⁵Modern Physics Institute, Fudan University, Shanghai 200433, People’s Republic of China
⁶Centre Interdisciplinaire de Recherche Ion-Laser CIRIL, Ganil, F 14070 Caen, France

^*s.hagmann@gsi.de

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Vol. 99, Iss. 16 — 19 October 2007

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Physical Review Letters

Radiative Electron Capture to the Continuum and the Short-Wavelength Limit of Electron-Nucleus Bremsstrahlung in 90A MeV U88+(1s22s2)+N2 Collisions

M. Nofal, S. Hagmann, Th. Stöhlker, D. H. Jakubassa-Amundsen, Ch. Kozhuharov, X. Wang, A. Gumberidze, U. Spillmann, R. Reuschl, S. Hess, S. Trotsenko, D. Banas, F. Bosch, D. Liesen, R. Moshammer, J. Ullrich, R. Dörner, M. Steck, F. Nolden, P. Beller, H. Rothard, K. Beckert, and B. Franczak

Phys. Rev. Lett. 99, 163201 – Published 18 October 2007

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Radiative Electron Capture to the Continuum and the Short-Wavelength Limit of Electron-Nucleus Bremsstrahlung in $90 A MeV$ $U^{88 +} (1 s^{2} 2 s^{2}) + N_{2}$ Collisions