2-7 June 2019
Simon Fraser University
America/Vancouver timezone
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Beta Decay of 80,82-Ga with GRIFFIN and Shape Coexistence in 80,82-Ge

Jun 4, 2019, 9:15 AM
15m
SSB 7172 (Simon Fraser University)

SSB 7172

Simon Fraser University

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) Nuclear Physics / Physique nucléaire (DNP-DPN) T1-3 Nuclear Structure II (DNP) | Structure nucléaire II (DPN)

Speaker

Aimee Bell (Simon Fraser University)

Description

Shape coexistence in atomic nuclei, the existence of structures with different degrees of deformation in a very narrow energy range, is an exciting phenomenon that is present across the nuclidic chart. A recent theoretical study$^{[1]}$ using large scale shell model calculations predicted a well deformed prolate band at a low excitation energy in the doubly magic $^{78}$Ni nucleus which indicated the presence of shape coexistence very far from stability. At the same time, another experiment$^{[2]}$ observed an intruder 0$_{2}$$^{+}$ state in $^{80}$Ge and interpreted this as evidence of shape coexistence. In our $\beta$-decay experiment, we aim to perform comprehensive spectroscopy of the $^{80}$Ge and $^{82}$Ge nuclei and investigate the evolution of their respective intruder excited 0$_2$$^{+}$ states.

An experiment to search for shape coexistence in $^{80}$Ge and $^{82}$Ge has been performed at the ISAC-TRIUMF facility. The $^{80}$Ge and $^{82}$Ge isotopes were formed from the $\beta$-decay of their parent isotopes, $^{80}$Ga and $^{82}$Ga respectively. The $^{80}$Ga and $^{82}$Ga beams were produced by the ISOL technique using a 500 MeV proton beam with a 10 $\mu$A current colliding with a UC$_x$ target. A specialized ion source was used to suppress Rb contamination. The $\beta$-decay was measured using the GRIFFIN spectrometer which was equipped with 15 HPGe detectors for gamma ray detection, plastic scintillators for $\beta$-$\gamma$ tagging, the PACES array which has 5 Si(Li) detectors for conversion electron spectroscopy and 8 LaBr$_3$ scintillators for fast timing measurements of nuclear levels. Using this versatile array, correlated $\gamma$-$\gamma$, $\gamma$-electron and electron-electron data have been acquired simultaneously, providing a highly detailed level scheme for $^{80}$Ge. The preliminary results of this data analysis will be presented. \newline

[1] F. Nowacki, A. Poves, E. Caurier and B. Bounthong, PRL 117 272501 (2016).
[2] A. Gottardo et al., PRL 116, 182501 (2016).

Primary author

Aimee Bell (Simon Fraser University)

Co-authors

C. Andreoiu (Simon Fraser University) F. A. Ali (Department of Physics, University of Guelph, Guelph, Ontario ) Gordon Ball (TRIUMF) Nikita Bernier (TRIUMF) Soumendu Sekhar Bhattacharjee (TRIUMF) M. Bowry (Physical Sciences Division, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia) Robin Coleman (University of Guelph) I. Dillmann (Physical Sciences Division, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia) Isaiah Djianto (Simon Fraser University) A.M. Forney (University of Maryland College Park) F.H. Garcia (Department of Chemistry, Simon Fraser University, Burnaby, BC) A. B. Garnsworthy (Physical Sciences Division, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia) Melanie Gascoine (Simon Fraser University) Greg Hackman (TRIUMF) Kyle Leach (Colorado School of Mines) A. N. Murphy (TRIUMF) C. Natzke (Colorado School of Mines) B. Olaizola (Physical Sciences Division, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia) Kevin Ortner E. E. Peters (University Of Kentucky) Costel Petrache (University Paris Sud) M.M. Rajabali (Tennessee Technological University) Kurtis Raymond (Simon Fraser University) C. E. Svensson (Department of Physics, University of Guelph, Guelph, Ontario) G. Tocabens (Universite Paris-Sud) R. Umashankar (TRIUMF) K. Whitmore (Department of Physics, Simon Fraser University, Burnaby, British Columbia) Jonathan Williams (Simon Fraser University) Daniel Aaron Yates (TRIUMF (CA))

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