Deformed structures in the vicinity of ^40_20Ca^ _20

Astronomy and Astrophysics – Astrophysics

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Scientific paper

Three experiments performed with the Gammasphere spectrometer in conjunction with the Microball charged-particle detector array have provided a vast amount of information on excited states in nuclei around doubly-magic ^40Ca. The first experiment employed the ^20Ne + ^28Si reaction with a thin target. Analysis of the 2α-selected channel led to the first observation of a superdeformed band in ^40Ca, for which the deformation was established through a fractional Doppler shift [F(τ)] analysis [E. Ideguchi et al., Phys. Rev. Lett. 87, 222501 (2001)]. The subsequent experiments were performed using the reaction ^24Mg + ^24Mg with both a thin, self-supporting target and a backed target. The latter was used to increase sensitivity to lifetimes of states in the ≈0.1 - 1 ps range. The recent analysis of these experiments has focussed on the odd-Z ^42,43Sc isotopes, where at least one candidate for a deformed structure similar to the SD band in ^40Ca (smoothness of E_x(I) and large moment of inertia) has been identified. One goal of this ongoing analysis is to establish the lifetimes in this and other deformed structures.

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