Abstract
Deep-inelastic collisions of a 208 Pb beam on a 208 Pb target were performed us- ing the ATLAS accelerator at Argonne National Laboratory. The Gammasphere detector array was used for the detection of prompt and delayed gamma-rays of the reaction prod- ucts. 207 Tl is one proton away from the 208 Pb doubly-magic nucleus. Its low-energy level structure is dominated by the single proton-hole states s 1
Highlights
The nuclei in the area to the ’south-east’ of doubly-magic 208Pb have comparatively little known about their spectroscopic properties [1,2,3,4]
In 207Tl, the octupole phonon coupled to the πh−111/2 state forms an yrast state decaying through a 2465 keV transition, which has an E3 character [5]
The known transitions in 207Tl [5, 6], such as the 2465 keV E3 transition, as well as several transitions identified for the first time in this experiment, are visible in the spectrum
Summary
The nuclei in the area to the ’south-east’ of doubly-magic 208Pb have comparatively little known about their spectroscopic properties [1,2,3,4]. An experiment was performed where several of these nuclei were populated via deep-inelastic collisions The first excited state of 208Pb at 2614 keV, has a spin-parity of 3−, and decays via a collective E3 transition to the ground state. In 207Tl, the octupole phonon coupled to the πh−111/2 state forms an yrast state decaying through a 2465 keV transition, which has an E3 character [5]. Similar states have been observed in, for example, 206Hg, 209Bi, 207Pb, and 209Pb [1, 6, 7]
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