A first extraction of the weak magnetism form factor and Fierz interference term from the $^{114}$In $\rightarrow$$^{114}$Sn Gamow-Teller transition - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2024

A first extraction of the weak magnetism form factor and Fierz interference term from the $^{114}$In $\rightarrow$$^{114}$Sn Gamow-Teller transition

L de Keukeleere
  • Fonction : Auteur
D Rozpedzik
  • Fonction : Auteur
N Severijns
  • Fonction : Auteur
K Bodek
  • Fonction : Auteur
K Lojek
  • Fonction : Auteur
M Perkowski
  • Fonction : Auteur
S Vanlangendonck
  • Fonction : Auteur

Résumé

Spectrum shape measurements in nuclear $\beta$ decay can be used to test physics beyond the Standard Model with results being complementary to high-energy collider experiments. In particular, Beyond Standard Model sensitivity of the weak interaction is expressed through the so-called Fierz interference term. Additionally, the $\beta$ spectrum shape is a useful tool to probe Standard Model effects, among which the most prominent is \textit{weak magnetism}, a higher-order recoil correction induced by nuclear pion exchange. To study effects in the $\beta$ spectrum shape at a precision level competitive with the LHC, a new spectrometer was designed and built. It consists of a 3D low-pressure gas electron tracker and a plastic scintillator used for triggering the data acquisition and recording the $\beta$ particle energy. In this Letter, the results from $\beta$ spectrum shape measurements on the allowed Gamow-Teller transition $^{114}\text{In} \rightarrow ^{114}\text{Sn}$ are presented, including a first extraction of the weak magnetism form factor in the high nuclear mass range and a new estimate of the $90\%$ confidence interval for the Fierz interference term.

Dates et versions

hal-04558657 , version 1 (25-04-2024)

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Citer

L de Keukeleere, D Rozpedzik, N Severijns, K Bodek, L Hayen, et al.. A first extraction of the weak magnetism form factor and Fierz interference term from the $^{114}$In $\rightarrow$$^{114}$Sn Gamow-Teller transition. 2024. ⟨hal-04558657⟩
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