Fast-timing measurements in neutron-rich odd-mass Fast-timing - - PowerPoint PPT Presentation

fast timing measurements in neutron rich odd mass fast
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Fast-timing measurements in neutron-rich odd-mass Fast-timing - - PowerPoint PPT Presentation

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


slide-1
SLIDE 1
  • E. Gamba
  • E. Gamba

20-24 March 2017- Chamrousse 20-24 March 2017- Chamrousse

Fast-timing measurements in neutron-rich odd-mass Fast-timing measurements in neutron-rich odd-mass zirconium isotopes using LaBr zirconium isotopes using LaBr3

3:Ce detectors coupled with

:Ce detectors coupled with GAMMASPHERE GAMMASPHERE

slide-2
SLIDE 2
  • E. Gamba
  • E. Gamba

20-24 March 2017- Chamrousse 20-24 March 2017- Chamrousse

Set up Set up

One hemisphere of GAMMASPHERE made of 51 Compton-suppressed HPGe detectors A scintillator array made of 25 LaBr3:Ce detectors A 34.4 μCi 252Cf source at the focus of the 2 hemispheres Digital acquisition for the entire LaBr3:Ce array for the first time 30-day long measurement → 18 Tera bytes of raw data (4 Tb when compressed) Aim: Investigation of the deformed regions of the nuclear chart around mass A ~ 100 and A ~ 150

>10-2

10-2-10-3 10-3-10-4

Distribution of the fission products from the spontaneous fission of 252Cf

Fission Yields [ions/fission]

slide-3
SLIDE 3
  • E. Gamba
  • E. Gamba

20-24 March 2017- Chamrousse 20-24 March 2017- Chamrousse

100Zr after gates on 8+→6+ and 6+→ 4+

4+→2+ (100Zr) 2+→0+ (100Zr) 4+→2+ (148Ce) 2+→0+ (148Ce) 6+→4+ (148Ce) 10+→8+ (100Zr)

102Zr after gates on 2+→0+ and 4+→ 2+

6+→4+ (146Ce) 2+→0+ (148Ce) 8+→6+ (102Zr) 2+→0+

(146Ce)

4+→2+ (148Ce) 4+→2+ (146Ce) 283keV (147Ce) 10+→8+ (148Ce) 6+→4+ (102Zr)

Spectroscopy Spectroscopy

Fission fragment distributions for 100Zr and 102Zr obtained from even-A partners σ = 2.14 σ = 1.98

102Zr 100Zr

slide-4
SLIDE 4
  • E. Gamba
  • E. Gamba

20-24 March 2017- Chamrousse 20-24 March 2017- Chamrousse

Fast-timing Fast-timing

τLit = 791(+26) ps τmeas= 705(12) ps

  • 35

Example γ-γ matrix (LaBr3:Ce -LaBr3:Ce)

  • f 100Zr 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

  • f the adopted value
slide-5
SLIDE 5
  • E. Gamba
  • E. Gamba

20-24 March 2017- Chamrousse 20-24 March 2017- Chamrousse

  • 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

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