26-30 June 2011
Centro Culturale Altinate, Padova, Italy
Europe/Rome timezone

Characterization of new structures in octupole-deformed radium and thorium nuclei

30 Jun 2011, 12:35
17m
Sala Polivalente (Centro Culturale Altinate, Padova, Italy)

Sala Polivalente

Centro Culturale Altinate, Padova, Italy

Via Altinate 71 Padova Italy

Speaker

John F. Smith (UWS)

Description

An experiment was performed using AGATA to characterise new structures observed in the octupole-deformed light-actinide nuclei 220Ra and 222Th. The primary goal of the experiment was to measure the linear polarizations of transitions linking new (unpublished) rotational-like structures to the yrast octupole bands in these nuclei, and in the case of 222Th, to measure the linear polarizations of inter-band dipole transitions in the new structure. AGATA was used with the 18O (95 MeV) + 208Pb fusion-evaporation reactions. It is intended that the gamma-ray interaction positions within the AGATA detectors will be used to reconstruct the scattering angles of the transitions of interest, and hence determine their linear polarizations. Establishing whether inter-band dipole transitions in the new structure in 222Th are E1 or M1 is crucial to its possible interpretation as an excited alternating-parity octupole band. Although the gamma-ray spectra will be dominated by gamma rays from fast fission, the fission background can be effectively removed by gamma-ray gating. The data are presently in the early stages of analysis.

Primary authors

Daniele Mengoni (PD) John F. Smith (UWS)

Presentation Materials