Theoretical analysis of the electron bridge process in 229Th3+

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:408

Article; Proceedings Paper

Mueller, R. A.^1,2  Volotka, A. V.³  Fritzsche, S.^3,4  Surzhykov, A.^1,2 

[1] Phys Tech Bundesanstalt, D-38116 Braunschweig, Germany

[2] Tech Univ Carolo Wilhelmina Braunschweig, D-38106 Braunschweig, Germany

[3] Helmholtz Inst Jena, D-07743 Jena, Germany

[4] Friedrich Schiller Univ Jena, Theoret Phys Inst, D-07743 Jena, Germany

关键词: Electron bridge;    Thorium 229;    Nuclear excitation;   

DOI  :  10.1016/j.nimb.2017.05.004

来源: Elsevier

【 摘 要 】

We investigate the deexcitation of the Th-229 nucleus via the excitation of an electron. Detailed calculations are performed for the enhancement of the nuclear decay width due to the so called electron bridge (EB) compared to the direct photoemission from the nucleus. The results are obtained for triply ionized thorium by using a B-spline pseudo basis approach to solve the Dirac equation for a local x(alpha) potential. This approach allows for an approximation of the full electron propagator including the positive and negative continuum. We show that the contribution of continua slightly increases the enhancement compared to a propagator calculated by a direct summation over bound states. Moreover we put special emphasis on the interference between the direct and exchange Feynman diagrams that can have a strong influence on the enhancement. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free