Speaker
Description
Laser-assisted decay spectroscopy of 178Au at the ISOLDE Decay Station
C. A. A. Page *
University of York (UK).
In the region around the Z=82 shell closure and the N = 104 midshell, competition between spherical and deformed configurations leads to the phenomenon of shape coexistence [1]. Previous work (e.g. [2]) has sought to understand the structure of isotopes of gold (Z=79) to establish the extent to which such competition dictates their characteristics. A recent laser spectroscopy study [3] has shown that 178Au has two isomers, one of high and one of low spin and different deformations [4].
In August 2021, a decay spectroscopy experiment was performed [5] using the ISOLDE Decay Station (IDS) with isomerically pure beams of 178Au provided by RILIS. The isomeric selectivity combined with high γ energy resolution and efficiency of IDS were necessary for making such measurements due to the extremely low α branching ratios of some decay paths. Through β decay, it is also possible to study different sets of states of 178Pt populated by the two 178Au isomers. This contribution will comprise a summary of the experimental techniques used to collect these data and an overview of the determined structures of 178Au and 178Pt.
[1] K. Heyde and J. L. Wood Rev. Mod. Phys. 83, 1467 (2011)
[2] P. M. Davidson et al., Nuclear Physics A 657 219-250 (1999)
[3] J. G. Cubiss et al., Phys. Rev. C 102, 044332 (2020)
[4] J. G. Cubiss et al., submitted to PRL
[5] B. Andel, A. N. Andreyev, A. E. Barzakh, J. G. Cubiss, P. Van Duppen et al, IS665 experiment at ISOLDE August 2021
*On behalf of the RILIS-IDS collaboration
