Direct Evidence for Octupole Deformation in ^{146}Ba and the Origin of Large E1 Moment Variations in Reflection-Asymmetric Nuclei.

Autor: Bucher B; Lawrence Livermore National Laboratory, Livermore, California 94550, USA.; Idaho National Laboratory, Idaho Falls, Idaho 83415, USA., Zhu S; Argonne National Laboratory, Argonne, Illinois 60439, USA., Wu CY; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Janssens RVF; Argonne National Laboratory, Argonne, Illinois 60439, USA., Bernard RN; Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain., Robledo LM; Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain., Rodríguez TR; Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain., Cline D; University of Rochester, Rochester, New York 14627, USA., Hayes AB; University of Rochester, Rochester, New York 14627, USA., Ayangeakaa AD; Argonne National Laboratory, Argonne, Illinois 60439, USA., Buckner MQ; Lawrence Livermore National Laboratory, Livermore, California 94550, USA., Campbell CM; Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA., Carpenter MP; Argonne National Laboratory, Argonne, Illinois 60439, USA., Clark JA; Argonne National Laboratory, Argonne, Illinois 60439, USA., Crawford HL; Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA., David HM; Argonne National Laboratory, Argonne, Illinois 60439, USA., Dickerson C; Argonne National Laboratory, Argonne, Illinois 60439, USA., Harker J; Argonne National Laboratory, Argonne, Illinois 60439, USA.; University of Maryland, College Park, Maryland 20742, USA., Hoffman CR; Argonne National Laboratory, Argonne, Illinois 60439, USA., Kay BP; Argonne National Laboratory, Argonne, Illinois 60439, USA., Kondev FG; Argonne National Laboratory, Argonne, Illinois 60439, USA., Lauritsen T; Argonne National Laboratory, Argonne, Illinois 60439, USA., Macchiavelli AO; Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA., Pardo RC; Argonne National Laboratory, Argonne, Illinois 60439, USA., Savard G; Argonne National Laboratory, Argonne, Illinois 60439, USA., Seweryniak D; Argonne National Laboratory, Argonne, Illinois 60439, USA., Vondrasek R; Argonne National Laboratory, Argonne, Illinois 60439, USA.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2017 Apr 14; Vol. 118 (15), pp. 152504. Date of Electronic Publication: 2017 Apr 12.
DOI: 10.1103/PhysRevLett.118.152504
Abstrakt: Despite the more than 1 order of magnitude difference between the measured dipole moments in ^{144}Ba and ^{146}Ba, the octupole correlations in ^{146}Ba are found to be as strong as those in ^{144}Ba with a similarly large value of B(E3;3^{-}→0^{+}) determined as 48(+21-29)  W.u. The new results not only establish unambiguously the presence of a region of octupole deformation centered on these neutron-rich Ba isotopes, but also manifest the dependence of the electric dipole moments on the occupancy of different neutron orbitals in nuclei with enhanced octupole strength, as revealed by fully microscopic calculations.
Databáze: MEDLINE