Collectivity of Cr Isotopes Approaching N = 40
ORAL
Abstract
The reduced quadrupole transition probability, $B$($E$2;$0^+ \rightarrow 2^+$), provides a way to quantify low-lying collectivity in even-even nuclei. $B$($E$2) values for $^{58,60,62}$Cr were extracted using intermediate-energy Coulomb excitation at the NSCL. Cocktail beams containing $^{58,60,62}$Cr were produced in-flight and guided onto a high-$Z$ target. De-excitation gamma-rays tagging the inelastic process were detected in coincidence with the scattered particles using the high-purity germanium array SeGA and the S800 spectrograph. The measurement allowed the $B$($E$2) values of $^{60,62}$Cr to be extracted for the first time. Results are compared to large-scale shell-model calculations using a recent effective interaction developed for this region.
*This work was funded by the NSF under contract PHY-0606007; by the US DOE, ONP, under contracts DE- AC02-06CH11357 and DE-FG02-08ER41556 and by the UK Science and Technology Facilities Council (STFC).
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