Early Onset of Ground State Deformation in Neutron Deficient Polonium Isotopes

Cocolios, Thomas Elias; Dexters, W; Seliverstov, Maxim; Andreyev, Andrei; Antalic, S; Barzakh, AE; Bastin, Beyhan; Büscher, Jeroen; Darby, Iain; Fedorov, DV; Fedosseyev, VN; Flanagan, KT; Franchoo, S; Fritzsche, S; Huber, G; Huyse, Mark; Keupers, M; Ko¨ster, U; Kudryavtsev, Yuri; Mane´, E; Marsh, BA; Molkanov, PL; Page, RD; Sjoedin, AM; Stefan, I; Van de Walle, Jarno; Van Duppen, Piet; Venhart, Martin; Zemlyanoy, SG; Bender, M; Heenen, P-H

doi:10.1103/PhysRevLett.106.052503

Early Onset of Ground State Deformation in Neutron Deficient Polonium Isotopes

Author:

Cocolios, Thomas Elias

Dexters, W ; Seliverstov, Maxim ; Andreyev, Andrei ; Antalic, S ; Barzakh, AE ; Bastin, Beyhan ; Büscher, Jeroen ; Darby, Iain ; Fedorov, DV ; Fedosseyev, VN ; Flanagan, KT ; Franchoo, S ; Fritzsche, S ; Huber, G ; Huyse, Mark ; Keupers, M ; Ko¨ster, U ; Kudryavtsev, Yuri ; Mane´, E ; Marsh, BA ; Molkanov, PL ; Page, RD ; Sjoedin, AM ; Stefan, I ; Van de Walle, Jarno ; Van Duppen, Piet ; Venhart, Martin ; Zemlyanoy, SG ; Bender, M ; Heenen, P-H

Keywords:

Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, CHARGE-RADII, NUCLEAR MOMENTS, HYPERFINE-STRUCTURE, LASER SPECTROSCOPY, DROPLET-MODEL, MASS NUCLEI, SHIFTS, COEXISTENCE, PO-192, UPDATE, nucl-ex, nucl-th, 01 Mathematical Sciences, 02 Physical Sciences, 09 Engineering, General Physics, 40 Engineering, 49 Mathematical sciences, 51 Physical sciences

Abstract:

In-source resonant ionization laser spectroscopy of the even-A polonium isotopes 192–210;216;218Po has been performed using the 6p37s 5S2 to 6p37p 5P2 (lambda = 843.38 nm) transition in the polonium atom (Po-I) at the CERN ISOLDE facility. The comparison of the measured isotope shifts in 200–210Po with a previous data set allows us to test for the first time recent large-scale atomic calculations that are essential to extract the changes in the mean-square charge radius of the atomic nucleus. When going to lighter masses, a surprisingly large and early departure from sphericity is observed, which is only partly reproduced by beyond mean field calculations.