Level structure and deexcitations in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Ra</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>220</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> and their systematic behavior as a function of neutron number

P. D. Cottle; J. F. Shriner, Jr; F. Dellagiacoma; J. F. Ennis; M. Gai; D. A. Bromley; J. W. Olness; E. K. Warburton; L. Hildingsson; M. A. Quader; D. B. Fossan

doi:10.1103/PhysRevC.30.1768

Rapid Communication

Level structure and deexcitations in ${}^{220}{Ra}$ and their systematic behavior as a function of neutron number

P. D. Cottle, J. F. Shriner, Jr., F. Dellagiacoma, J. F. Ennis, M. Gai, D. A. Bromley, J. W. Olness, E. K. Warburton, L. Hildingsson, M. A. Quader, and D. B. Fossan

Phys. Rev. C 30, 1768(R) – Published 1 November 1984

Abstract

The level scheme of ${}^{220}{Ra}$ , constructed from ${}^{208}{Pb} ({}^{14}C, 2 n γ) {}^{220}{Ra}$ data, shows structure similar to that of ${}^{218}{Ra}$ , with interleaved states of alternating parities connected by enhanced $B (E 1)$ deexcitations. The $\frac{B (E 1)}{B (E 2)}$ ratios (for moderately high spins) are two to three times smaller than in ${}^{218}{Ra}$ ; we observe a smooth and rapid increase of the $B (E 1)$ values toward shell closures. The systematics of the Ra isotopes are used to examine the alpha cluster model of Iachello-Jackson and the permanent octupole shape model.