Electromagnetic Transition Strengths in $^{\mathrm{27}}$Ne
ORAL
Abstract
Previous measurements have established that halo nuclei are well characterized by their electromagnetic properties, with the E1 transition strengths reflecting a large neutron radius, and M1 transition strengths characterizing the dominant $s$ wave strength.~The 1/2$^{\mathrm{+}}$ excited state of $^{\mathrm{27}}$Ne is close to the neutron separation energy and is expected to have a single valence neutron in the $s$ orbital, and therefore has the potential to exhibit halo effects. Furthermore, neighboring isotopes $^{\mathrm{26}}$Ne, $^{\mathrm{28}}$Ne demonstrate substantial deformation, so that $^{\mathrm{27}}$Ne should serve as an excellent benchmark for investigating the interplay between halo and deformation effects. We present here results of a new measurement of the lifetime of the $^{\mathrm{27}}$Ne 1/2$^{\mathrm{+}}$ excited state, performed at the NSCL using the Recoil Distance Method with the TRIPLEX Plunger in conjunction with GRETINA. In addition, a Coulomb-excitation measurement of $^{\mathrm{27}}$Ne has been performed using a novel application of the TRIPLEX plunger. The resulting transition strengths have been extracted and their implications are discussed.
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