Jun 13 – 19, 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

Atomic Recoil Processes following He-6 Beta Decay

Jun 17, 2015, 2:00 PM
CCIS L2-200 (University of Alberta)

CCIS L2-200

University of Alberta

Oral (Non-Student) / orale (non-étudiant) Division of Atomic, Molecular and Optical Physics, Canada / Division de la physique atomique, moléculaire et photonique, Canada (DAMOPC-DPAMPC) W2-10 Spectroscopy and Optics (DAMOPC) / Spectroscopie et optique (DPAMPC)


Dr Gordon Drake (University of Windsor)


There are currently several experiments in progress to search for new physics beyond the Standard Model by high precision studies of angular correlations in the $\beta$ decay of the helium isotope $^6{\rm He} \rightarrow\, ^6{\rm Li} + e^- + \bar{\nu}_e$. An essential part of the analysis is to understand the energy distribution and spectra of the recoil ions. After the $\beta$ decay event, the atomic electrons suddenly find themselves in a $^6$Li$^+$ environment with nuclear charge $Z = 3$. The electrons redistribute themselves over all possible states of the $^6$Li$^+$ ion, including the continuum leading to $^6$Li$^{++}$ and $^6$Li$^{3+}$. Evidence for new physics beyond the Standard Model would reveal itself by an additional tensor coupling contribution to the weak interaction, in addition to the simple Gamow-Teller axial-vector mechanism. We will present calculations employing Stieltjes imaging techniques in Hylleraas coordinates to study the probabilities for the shake-up and shake-off mechanisms, and especially the additional recoil accompanying the emission of the shake-off electrons. The results are of key importance in the interpretation of angular correlations following $\beta$ decay.

Primary author

Dr Gordon Drake (University of Windsor)


Ms Eva Schulhoff (University of windsor)

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