Fast-timing measurements in neutron-rich odd-mass Fast-timing measurements in neutron-rich odd-mass zirconium isotopes using LaBr 3 :Ce detectors coupled with zirconium isotopes using LaBr 3 :Ce detectors coupled with GAMMASPHERE GAMMASPHERE E. Gamba E. Gamba 20-24 March 2017- Chamrousse 20-24 March 2017- Chamrousse
Set up Set up Aim: Investigation of the deformed regions of the nuclear chart around mass A ~ 100 and A ~ 150 A 34.4 μCi 252 Cf source at the focus of the 2 hemispheres A scintillator array made of 25 LaBr 3 :Ce detectors One hemisphere of GAMMASPHERE made of 51 Compton-suppressed HPGe detectors Digital acquisition for the entire LaBr 3 :Ce array for the first time 30-day long measurement → 18 Tera bytes of raw data (4 Tb when compressed) Fission Yields [ions/fission] >10 -2 10 -3 -10 -4 10 -2 -10 -3 Distribution of the fission products from the spontaneous fission of 252 Cf E. Gamba E. Gamba 20-24 March 2017- Chamrousse 20-24 March 2017- Chamrousse
Spectroscopy Spectroscopy 4 + →2 + 6 + →4 + 10 + →8 + 4 + →2 + 2 + →0 + 283keV ( 100 Zr) ( 102 Zr) ( 148 Ce) ( 148 Ce) ( 146 Ce ) ( 147 Ce) 2 + →0 + 6 + →4 + ( 100 Zr) ( 146 Ce) 2 + →0 + 4 + →2 + ( 148 Ce) ( 146 Ce) 8 + →6 + 4 + →2 + ( 102 Zr) ( 148 Ce) 10 + →8 + 6 + →4 + 2 + →0 + ( 100 Zr) ( 148 Ce) ( 148 Ce) 102 Zr after gates on 2 + →0 + and 4 + → 2 + 100 Zr after gates on 8 + →6 + and 6 + → 4 + 102 Zr 100 Zr Fission fragment distributions for 100 Zr and 102 Zr obtained from even-A partners σ = 2.14 σ = 1.98 E. Gamba E. Gamba 20-24 March 2017- Chamrousse 20-24 March 2017- Chamrousse
Fast-timing Fast-timing τ Lit = 791( +26 ) ps -35 τ meas = 705(12) ps Example γ-γ matrix (LaBr 3 :Ce -LaBr 3 :Ce) of 100 Zr after DGS gates on the 8 + →6 + and 6 + → 4 + transitions. The peak is the coincidence between the 4 + →2 + (start) and the 2 + → 0 + (stop) transitions. Preliminary result: measured lifetime value within two standard deviations of the adopted value E. Gamba E. Gamba 20-24 March 2017- Chamrousse 20-24 March 2017- Chamrousse
Author List Author List E. R. Gamba 1 , S. Lalkovski 2 , M. Rudigier 2 , A. M. Bruce 1 , S. Bottoni 3 , M. P. Carpenter 3 , S. Zhu 3 , A. D. Ayangeakaa 3 , J. T. Anderson 3 , T. A. Berry 2 , I. Burrows 4 , R. J. Carroll 2 , P. Copp 5 , M. Carmona Gallardo 6 , T. Daniel 2 , J. P. Greene 3 , L. A. Gurgi 2 , D. J. Hartley 7 , R. Ilieva 2 , S. Ilieva 8 , R. V. F. Janssens 3 , F. G. Kondev 9 , T. Kröll 8 , G. J. Lane 10 , T. Lauritsen 3 , I. Lazarus 4 , G. Lotay 2 , G. Fernàndez Martìnez 8 , Zs. Podolyák 2 , V. Pucknell 4 , M. Reed 10 , P. H. Regan 2,11 , J. Rohrer 3 , J. Sethi 3 ,D. Seweryniak 3 , C. M. Shand 2 , J. Simpson 4 , M. Smolen 12 , E. A. Stefanova 13 , V. Vedia 6 , O. Yordanov 13 1 School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4JG, United Kingdom 2 Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom 3 Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA 4 STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom 5 Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA. 6 Grupo de Física Nuclear, Facultad de CC. Físicas, Universidad Complutense, CEI Moncloa, ES-28040 Madrid, Spain 7 Department of Physics, U.S. Naval Academy, Annapolis, Maryland 21402, USA 8 Institut für Kernphysik, TU Darmstadt, Schlossgartenstrasse 9, 64289 Darmstadt, Germany 9 Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA 10 Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, Australian Capital Territory 0200, Australia 11 AIR Division, NPL, Teddington, TW11 0LW, United Kingdom 12 School of Engineering and Science, University of the West of Scotland, Paisley PA1 2BE,United Kingdom 13 INRNE, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria E. Gamba E. Gamba 20-24 March 2017- Chamrousse 20-24 March 2017- Chamrousse
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