Identification of the <i>J</i><SUP>π</SUP>=1<SUP>-</SUP> state in <SUP>218</SUP>Ra populated via α decay of <SUP>222</SUP>Th

Collapse authors list.
Parr, E, Smith, JF, Greenlees, PT, Smolen, M, Papadakis, P, Auranen, K, Chapman, R, Cullen, DM, Grahn, T, Grocutt, L et al (show 26 more authors) , Herzan, A, Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, Leino, M, McPeake, C, Mengoni, D, Mistry, AK, Mulholland, KF, O'Neill, GG, Pakarinen, J, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Scheck, M, Scholey, C, Sorri, J, Stolze, S, Taylor, MJ and Uusitalo, J (2016) Identification of the <i>J</i><SUP>π</SUP>=1<SUP>-</SUP> state in <SUP>218</SUP>Ra populated via α decay of <SUP>222</SUP>Th. PHYSICAL REVIEW C, 94 (1). 014307-.

Text Main_text_including_figures_with_ref_corr.pdf - Author Accepted Manuscript Download (360kB)

Abstract

The α decay of Th222 populating the low-lying Jπ=3- state, and also a proposed 1- state, in Ra218 has been observed. The observations suggest an excitation energy of 853 keV for the 1- state, which is 60 keV above the 3- state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the Jπ=1- and 3- states suggest they are produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric octupole-deformed shape.

Item Type:	Article
Uncontrolled Keywords:	5106 Nuclear and Plasma Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	28 Jul 2016 14:38
Last Modified:	21 Jun 2024 03:36
DOI:	10.1103/PhysRevC.94.014307
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3002611