Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Struktur und Dynamik von Kernen

HK 11.5: Talk

Monday, March 17, 2014, 17:45–18:00, HZ 5

Investigation of the beta decay spectrum of ¹¹³Cd with the COBRA experiment — •Fabian Heisse for the COBRA collaboration — Technische Universität Dresden

The investigation of the fourfold forbidden, non-unique beta decay can only be performed with three isotopes, one of them is ¹¹³Cd. For this purpose, data from the COBRA experiment using CZT detectors are used.

In this talk I will present a data selection and the results from taking data in the LNGS Underground Laboratory. Based on the recorded spectrum of the detectors, the important Q_β − value = (323.6 ± 1.2 ) keV for beta decay and the half-life T_1/2 ( ¹¹³Cd ) = (7.91 ± 0.22 ) · 10¹⁵ years have been determined. These values fit very well to various theory models and other existing experimental results. Furthermore, the shape of the spectrum is in good accordance to the predicted theory throughout the whole region ( 50 keV < E_kin ( electron ) < 324 keV ).

However, there are still some unanswered questions, such as the behavior of the rate spectrum in the low energy region down to E_kin ( electron ) = 0 keV. An outlook and further improvements between theoretical description and experimental data are given.