Charge Radius of the Short-Lived < /SUP>68< //SUP>Ni and Correlation with the Dipole Polarizability

Kaufmann, S; Simonis, J; Bacca, S; Billowes, J; Bissell, ML; Blaum, K; Cheal, B; Ruiz, RF Garcia; Gins, W; Gorges, C; Hagen, G; Heylen, H; Kanellakopoulos, A; Malbrunot-Ettenauer, S; Miorelli, M; Neugart, R; Neyens, G; Noertershaeuser, W; Sanchez, R; Sailer, S; Schwenk, A; Ratajczyk, T; Rodriguez, L; Wehner, L; Wraith, C; Xie, L; Xu, ZY; Yang, XF; Yordanov, DT

doi:10.1103/PhysRevLett.124.132502

Charge Radius of the Short-Lived < /SUP>68< //SUP>Ni and Correlation with the Dipole Polarizability

Author:

Kaufmann, S

Simonis, J ; Bacca, S ; Billowes, J ; Bissell, ML ; Blaum, K ; Cheal, B ; Ruiz, RF Garcia ; Gins, W ; Gorges, C ; Hagen, G ; Heylen, H ; Kanellakopoulos, A ; Malbrunot-Ettenauer, S ; Miorelli, M ; Neugart, R ; Neyens, G ; Noertershaeuser, W ; Sanchez, R ; Sailer, S ; Schwenk, A ; Ratajczyk, T ; Rodriguez, L ; Wehner, L ; Wraith, C ; Xie, L ; Xu, ZY ; Yang, XF ; Yordanov, DT

Keywords:

Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, EXCHANGE, 01 Mathematical Sciences, 02 Physical Sciences, 09 Engineering, General Physics, 40 Engineering, 49 Mathematical sciences, 51 Physical sciences

Abstract:

We present the first laser spectroscopic measurement of the neutron-rich nucleus ^{68}Ni at the N=40 subshell closure and extract its nuclear charge radius. Since this is the only short-lived isotope for which the dipole polarizability α_{D} has been measured, the combination of these observables provides a benchmark for nuclear structure theory. We compare them to novel coupled-cluster calculations based on different chiral two- and three-nucleon interactions, for which a strong correlation between the charge radius and dipole polarizability is observed, similar to the stable nucleus ^{48}Ca. Three-particle-three-hole correlations in coupled-cluster theory substantially improve the description of the experimental data, which allows to constrain the neutron radius and neutron skin of ^{68}Ni.