Abstract
In this study we present the preliminary results about the lifetimes of the , states of 208Po and the upper limit of the lifetime of the state. For measuring the lifetimes of the and states the Recoil Distance Doppler Shift (RDDS) method and for the lifetime of the state the Doppler Shift Attenuation method (DSAM) were used. The resulting absolute transition strength reveals the predominant isovector nature of the state of 208Po.
Highlights
The properties of open-shell nuclei in the immediate vicinity of doubly-magic cores are of particular importance because such nuclei can often be understood well within the framework of the shell model [1] and at the same time their valence particles can induce the onset of collective behavior [2]
The lifetime of the 4+1 state was determined using the Decay Curve Method where the measurement of the intensities of the shifted (Ish) and unshifted (Iun) components as a function of the plunger distance gives the lifetime if the velocity of the recoiling nuclei is known [15]
The low energy of the 2+1 state (686 keV) indicates that the neutron part of its wave function is likely stronger than the proton one
Summary
The properties of open-shell nuclei in the immediate vicinity of doubly-magic cores are of particular importance because such nuclei can often be understood well within the framework of the shell model [1] and at the same time their valence particles can induce the onset of collective behavior [2]. Experimental set-up For measuring the lifetime of the 2+2 state of 208Po by means of DSAM In order to detect these α-particles but to stop other heavier fragments from additional transfer reactions an Al foil was placed between the target and the solar cells.
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