Quadrupole moments and coexistence in even calcium nuclei

Coulomb excitation ofCa44andAr46

“…The best agreement between the calculated (red line of Fig. 4) and the experimental (black crosses) cross sections of 53 (4) [36], as well as with the values obtained via Coulomb excitation [37,38], Doppler-shift attenuation method [39][40][41], electron [42,43], and alpha scattering [44].…”

“…Adding the information on the B(E2) values, the neutron transition matrix elements M n have been deduced. As for 38 Ar, the mirror nucleus relation [52] was used to deduce its M n value. The evolution of phenomenological proton M In the generalized effective charge model [54] both the proton and neutron quadrupole matrix elements are interrelated due to the polarization carried by each nucleon.…”

Superdeformed and Triaxial States inCa42

“…Firstly, its moment of inertia, which is proportional to the quadrupole deformation parameter β 2 [25], is large and similar to those in the SD bands in 36 Ar and 40 Ca. The strongly deformed character of this band is further supported by the observation of its preferential feeding from the low-energy component of the highly-split giant dipole resonance decay of 46 Ti [26].…”

“…It was fitted to the observed γ-ray yields, as well as to the known spectroscopic data for 42 Ca: lifetimes of the yrast and nonyrast states [27,[36][37][38][39][40][41][42][43][44][45], E2/M1 mixing ratios [28,47], the quadrupole moment of the 2 + 1 state [36], and the branching ratios [45,46,48,49]. In particular, the 2…”

Quadrupole collectivity in Ca42 from low-energy Coulomb excitation with AGATA

“…) measured in a one-step Coulomb-excitation experiment with a 32 S beam [51] was used in the current data analysis. In this measurement, the state of interest was populated from below, and possible influence of multistep excitation of higher-lying states was well controlled and taken into account in the data analysis.…”