Bulg. J. Phys. vol.44 no.4 (2017), pp. 372-379

First Excited 0+ States in Deformed Nuclei

A. Aprahamian1, S.R. Lesher2, A. Stratman1
1Dept. of Physics, University of Notre Dame, Notre Dame, IN, USA
2Dept. of Physics, University of Wisconsin La Crosse, La Crosse, WI, 54601, USA
Abstract. The nature of vibrations or excitations built on a deformed nuclear shape remains an open question in nuclear structure. The 156Gd nucleus is one of the most extensively studied nuclei with the (n, γ), (n, e-), (α, 2n) reactions yielding a spectrum of six excited 0+ states. This work reports on the measurements of level lifetimes in the 156Gd nucleus following neutron capture using the GRID (Gamma Ray Induced Doppler broadening) technique at the Institut Laue-Langevin (ILL) in Grenoble, France. In total, twelve level lifetimes have been measured, including the three Kπ = 0+ states at 1049, 1154, and 1715 keV. The Kπ = 0+ state at 1049 is more strongly connected to the ground state levels than the Kπ = 0+ state at 1154 keV by factors of 5 and the Kπ = 0+ state at 1715 keV is connected to the Kπ = 2+ band by an order of magnitude stronger B(E2) values than to the ground state levels.

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