Quenching of Deduced From the -spectrum Shape of Cd measured with the COBRA experiment
Lucas Bodenstein-Dresler (TU Dortmund, Lehrstuhl für Experimentelle Physik IV, Dortmund, Germany); Yingjie Chu (TU Dresden, Institut für Kern- und Teilchenphysik, Dresden, Germany); Daniel Gehre (TU Dresden, Institut für Kern- und Teilchenphysik, Dresden, Germany); Claus Gößling (TU Dortmund, Lehrstuhl für Experimentelle Physik IV, Dortmund, Germany); Arne Heimbold (TU Dresden, Institut für Kern- und Teilchenphysik, Dresden, Germany); et al - Show all 20 authors
A dedicated study of the quenching of the weak axial-vector coupling strength in nuclear processes has been performed by the COBRA collaboration. This investigation is driven by nuclear model calculations which show that the β-spectrum shape of the fourfold forbidden non-unique decay of $^{113}$Cd strongly depends on the effective value of . Using an array of CdZnTe semiconductor detectors, 45 independent $^{113}$Cd spectra were obtained and interpreted in the context of three nuclear models. The resulting effective mean values are , and . These values agree well within the determined uncertainties and deviate significantly from the free value of . This can be seen as a first step towards answering the long-standing question regarding quenching effects related to in low-energy nuclear processes.