Nuclear structure of odd-Au isotopes studied at ISOLDE facility with the TATRA spectrometer

by Martin Venhart (Institute of Physics, Slovak Academy of Sciences )

Wednesday 29 Jun 2022, 14:00 → 15:00 Europe/Prague

Abstract:

Odd-mass nuclei allow to study several phenomena of nuclear structure. Most notably, deformation parameters, both axial and triaxial, can be determined from the spectrum of their excited states. Odd-mass Au isotopes are known to exhibit multiple shape coexistence. Many configurations coexist at low excitation energies, resulting in an enormous density of excited states. In the seminar, a new data acquired with the TATRA spectrometer at ISOLDE facility at CERN will be presented. Excited states of the $^{181,183}$Au isotopes were populated through beta decay of the $^{181,183}$Hg precursors. Conversion electrons and gamma rays were detected simultaneously. The novel Broad Energy Germanium detector was used to detect gamma rays. Its supreme energy resolution, together with nearly ideal gaussian peak shape allowed to construct the level schemes of $^{181,183}$Au. An electric monopole transition was identified in $^{183}$Au.

Experiments at ISOLDE were complemented with in-beam gamma-ray spectroscope and isomer spectroscopy performed at the University of Jyväskylä. Combination of these approaches allowed to extend the systematics of excited state of odd-Au isotopes. New rotational bands and isomeric states, that do not have precedents in heavier isotopes, were identified.

 

The seminar will be held in the main conference hall in the building of the Institute of Physics, Na Slovance 2, Prague 8 on the ground floor.

Location: https://goo.gl/maps/wEf7PsiLimSXMZhE9

 

The seminar will be also available via ZOOM video conference system:

Meeting ID: 674 9629 6646
Passcode: 575511

or join meeting via direct ZOOM link

 

Venhart_invitation.pdf