학술논문
Evidence for rigid triaxial deformation in $^{76}$Ge from a model-independent analysis
Document Type
Working Paper
Author
Ayangeakaa, A. D.; Janssens, R. V. F.; Zhu, S.; Little, D.; Henderson, J.; Wu, C. Y.; Hartley, D. J.; Albers, M.; Auranen, K.; Bucher, B.; Carpenter, M. P.; Chowdhury, P.; Cline, D.; Crawford, H. L.; Fallon, P.; Forney, A. M.; Gade, A.; Hayes, A. B.; Kondev, F. G.; Krishichayan; Lauritsen, T.; Li, J.; Macchiavelli, A. O.; Rhodes, D.; Seweryniak, D.; Stolze, S. M.; Walters, W. B.; Wu, J.
Source
Phys. Rev. Lett. 123, 102501 (2019)
Subject
Language
Abstract
An extensive, model-independent analysis of the nature of triaxial deformation in $^{76}$Ge, a candidate for neutrinoless double-beta ($0\nu\beta\beta$) decay, was carried out following multi-step Coulomb excitation. Shape parameters deduced on the basis of a rotational-invariant sum-rule analysis provided considerable insight into the underlying collectivity of the ground-state and $\gamma$ bands. Both sequences were determined to be characterized by the same $\beta$ and $\gamma$ deformation parameter values. In addition, compelling evidence for low-spin, rigid triaxial deformation in $^{76}$Ge was obtained for the first time from the analysis of the statistical fluctuations of the quadrupole asymmetry deduced from the measured $E2$ matrix elements. These newly determined shape parameters are important input and constraints for calculations aimed at providing, with suitable accuracy, the nuclear matrix elements relevant to $0\nu\beta\beta$.
Comment: 6 pages, 5 figures
Comment: 6 pages, 5 figures