New Nuclear Structure and Decay Results in the ⁷⁶Ge- ⁷⁶As System

Autor(en)

A. R. Domula, D. Gehre, K. Zuber, J. C. Drohe, N. Nankov, A. J. M. Plompen, C. Rouki, M. Stanoiu, A. Klix, A. Buffler, D. Geduld, F. D. Smit, C. Vermeulen, P. Maleka, R. T. Newman, R. Nolte, A. Wallner

Abstrakt

The process of neutrinoless double beta decay (0νββ) plays a key role in modern neutrino physics. Experiments on ⁷⁶Ge 0νββ-decay

using germanium semiconductors are at the forefront in this field. Due

to the extremely low count rates expected for this rare decay, any kind

of background event in the detector, especially at energies close to Qββ=2039.006 keV

must be avoided. Therefore, a careful investigation on the

neutron-induced background was carried out. In this scope experiments

investigating the inelastic neutron excitation of the lower lying and

the 69^thexcited level of ⁷⁶Ge have been performed. The existence of a 2040.7 keV gamma-ray, that occurs by the de-excitation of the 69^{th e}xcited level, was confirmed. Interfering background from ⁶⁸Ge was studied via cross-section measurements of the ^natGe(n,jn)⁶⁸Ge reaction using quasi-monoenergetic neutrons and accelerator mass specrometry for ⁶⁸Ge detection. In order to explore the matrix element for the transition between the ⁷⁶Ge-⁷⁶As ground states, the electron–capture of ⁷⁶As has been measured for the first time.

Organisation(en)

Isotopenphysik

Externe Organisation(en)

European Commission Joint Research Centre, Technische Universität Dresden, Karlsruher Institut für Technologie, University of Cape Town, National Research Foundation, Stellenbosch University, Physikalisch-Technische Bundesanstalt, Australian National University, iThemba Laboratory for Accelerator Based Sciences

Journal

Nuclear Data Sheets

Band

120

Seiten

44-47

Anzahl der Seiten

4

ISSN

0090-3752

DOI

https://doi.org/10.1016/j.nds.2014.07.002

Publikationsdatum

06-2014

Peer-reviewed

Ja

ÖFOS 2012

103014 Kernphysik

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/new-nuclear-structure-and-decay-results-in-the-76ge-76as-system(9d808b59-17d1-490a-a40d-4bd2e6f73842).html