Nuclear Data Sheets for A = 224

Identification of theJπ=1−state inRa218populated viaαParr1, Smith2, Greenlees3 et al. 2016Phys. Rev. C60101View full textAdd to dashboardCite

“…The hindrance factor of a ground-state-to-ground-state α decay for an even-even nucleus is set to unity, meaning that hindrance factors can also be considered as a measure of the similarity of the ground state and excited state of a daughter nucleus populated by an α decay. Figure 3 shows the hindrance factors of α decays to the first J π = 1 − and 3 − states in even-even isotopes of Th, Ra and Rn around the region of expected octupole collectivity [28][29][30][31][32][33][34]. Here, the J π = 1 − and 3 − states in 218 Rn have been assigned as the 840.2-and 796.9-keV levels respectively, observed following α decay [35].…”

Analytic description of critical-point actinides in a transition from octupole deformation to octupole vibrations

“…As a result, 226 Ra appears to be closest to the border between the two regions. [27], 222 Th [28], 224 Th [29], 226 Th [30], 228 Th [31], 230 Th [32], 232 Th [32,33], and 234 Th [32], as a function of the neutron number. (b) Same as (a) but for the associated negative-parity bands.…”

Octupole collectivity inMo98,100,102

“…For example, the typical structure of an alternating parity band is observed in the region of the light actinide nuclei Rn, Ra, and Th [2][3][4]. There, the negative parity levels with I < 8 appear above the neighboring even levels, i.e., E 1 − > E 2 + , E 3 − > E 4 + , and so on.…”