Photoexcitation of Ge76

R Schwengner,T Kögler,S E Müller,R Beyer,K Zuber,A R Junghans,H F Hoffmann,S Hammer,D Bemmerer,A Wagner,J A B Turko,R Massarczyk,K Schmidt,A Hartmann,S Urlaß,S Turkat,T Hensel,M Pichotta

doi:10.1103/physrevc.105.024303

Abstract

The dipole strength of the nuclide $^{76}$Ge was studied in photon-scattering experiments using bremsstrahlung produced with electron beams of energies of 7.8 and 12.3 MeV at the $\gamma$ELBE facility. We identified 210 levels up to an excitation energy of 9.4 MeV and assigned spin $J$ = 1 to most of them. The quasicontinuum of unresolved transitions was included in the analysis of the spectra and the intensities of branching transitions were estimated on the basis of simulations of statistical $\gamma$-ray cascades. The photoabsorption cross section up to the neutron-separation energy was determined and is compared with predictions of the statistical reaction model. The derived photon strength function is compared with results of experiments using other reactions.

Highlights

The search for signals of the neutrinoless double-β (0νββ) decay is currently one of the most challenging experimental efforts expected to gain information about the validity of the standard model of particle physics
The dipole strength of the nuclide 76Ge was studied in photon-scattering experiments using bremsstrahlung produced with electron beams of energies of 7.8 and 12.3 MeV delivered by the electron linear accelerator of high brilliance and high brightness (ELBE)
The existence of this decay mode would imply that neutrinos are identical with antineutrinos, their antiparticles, and that special conditions for their vertices exist, realized, for example, through a nonzero neutrino mass [1]. The discovery of this process would prove that the lepton number is violated by two units and that physics goes beyond the standard model

Summary

Introduction

The search for signals of the neutrinoless double-β (0νββ) decay is currently one of the most challenging experimental efforts expected to gain information about the validity of the standard model of particle physics The existence of this decay mode would imply that neutrinos are identical with antineutrinos, their antiparticles, and that special conditions for their vertices exist, realized, for example, through a nonzero neutrino mass [1]. The discovery of this process would prove that the lepton number is violated by two units and that physics goes beyond the standard model. Lower background levels have to be reached and every possible

Results

Discussion

Conclusion