Until recently, ^80Sr was thought to possess only positive-parity states, in contrast to many other neighboring nuclei which are known to have negative-parity states. Now there is indirect experimental evidence for negative-parity states, but the parities have not been measured directly. The goal of this study was to finally resolve this long-standing mystery by measuring conclusively the parities of as many excited states in ^80Sr as possible. ^80Sr nuclei were produced at Florida State University following the ^54Fe(^28Si, 2p) and the ^54Fe(^28Si, α2p) reactions at 90 and 110 MeV, respectively. Following the reactions, high-spin states in ^80Sr were populated and data were collected on the resulting cascades of emitted γ rays using an array of 10 Ge detectors. The linear polarizations of 31 γ rays were measured and many times allowed for the determination of the parity of the parent state that released the γ ray. The results have conclusively verified negative parity for one sequence of states, and positive parity for the yrast states.
APS Ohio Sections Fall Meeting Abstracts
- Pub Date:
- October 2007