# 2015 CAP Congress / Congrès de l'ACP 2015

13-19 June 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

17 Jun 2015, 14:00
15m
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)

### Speaker

Dr Gordon Drake (University of Windsor)

### Description

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)

### Co-author

Ms Eva Schulhoff (University of windsor)

### Presentation Materials

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