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Progress on the UK Contribution to FATIMA FATIMA Workshop, Grenoble, 19-20 July 2012

Progress on the UK Contribution to FATIMA FATIMA Workshop, Grenoble, 19-20 July 2012. Paddy Regan CNRP University of Surrey Guildford, GU2 7XH p.regan@surrey.ac.uk. UK Fast-Timing Array. Part of discrete STFC funded NuSTAR Project (also included projects for R3B and HISPEC @ FAIR)

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Progress on the UK Contribution to FATIMA FATIMA Workshop, Grenoble, 19-20 July 2012

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  1. Progress on the UK Contribution to FATIMAFATIMA Workshop, Grenoble, 19-20 July 2012 Paddy Regan CNRP University of Surrey Guildford, GU2 7XH p.regan@surrey.ac.uk

  2. UK Fast-Timing Array • Part of discrete STFC funded NuSTAR Project (also included projects for R3B and HISPEC @ FAIR) • People: • U. Brighton (Alison Bruce, Oliver Roberts [PDRA]) • Surrey (Paddy Regan, Zsolt Podolyak, Christopher Townsley) • U. West of Scotland (John Smith, Kieran Mullholland [PhD]) • STFC Daresbury (Ian Lazarus-DAQ) • U. Manchester (David Cullen, Andy Smith - design of holding structure). • Task to design, build and commission ‘stand alone’ fast-timing gamma-ray array for use with AIDA at focal plane of (S)FRS at GSI/FAIR as part of DESPEC collaboration. • Design (and budget) is for a modular, 30 (...or up to 36 later perhaps…) element array consisting of 1.5” x 2” LaBr3 cylinders.

  3. What we have ordered (end of June 2012), • co-ordinator, Dr. C. Townsley: • 31 LaBr3 detectors (2” x 1.5” cylinders) • 19 to U. Brighton (Alison Bruce, Oliver Roberts) • 12 to U. Surrey (Regan, Podolyak, Townsley) • Cost £186,852

  4. Initial Uses of (UK) Fatima Detectors(pre-DESPEC c.2017) • 21 detectors to go RIKEN (3 x 7 element clusters) for use in EURICA array from ~Oct/Nov. 2012. • Use in (for example) 170Dy beta-decay proposal. • ~8 detectors available for use with EXOGAM@ILL from early/mid 2013 for use in 235U(n,f) experimental campaign and/or Lohengrin experiments.

  5. LaBr3 cylinder detectors to be coupled to (30) Hamamatsu R9779 PMTs • anode (timing) • dynode (energy) outputs • 28 Hamamatsu PMTs with mu metal shield cases ordered May 2012 (£26,267)

  6. Prototype AIDA Enclosure • Prototype mechanical design • Based on 8cm x 8cm DSSSD • evaluate prior to design for 24cm x 8cm DSSSD • Compatible with RISING, TAS, 4p neutron detector • 12x 8cm x 8cm DSSSDs • 24x AIDA FEE cards • 3072 channels • Design complete • Mechanical assembly in • progress In –beam test on the FRS approved (S390) Hope to be scheduled in the 2nd half of 2011

  7. Possible Geometries (around AIDA)? hybrid ‘Crucifix’ (3 x 12 = 36 detectors) Hybrid ‘Crucifix’

  8. 2 x 3 design around AIDA stopper geometry.

  9. 36 cylinders 30 cylinders 24 cylinders

  10. simulations by O. Roberts, U. Brighton

  11. Possible DAQ Solutions • OPTION 1: Orthodox: • analogue, QDC for energy and TDCs for timing- common AIDA/FRS start.) • OPTION2: Mixed • XIA for energies and 10ns time stamp (ms isomer spectroscopy); TDCs with common FRS/AIDA start for ns g-g LaBr3 timing. • OPTION 3: Fully digital: • Digitiser with FPGA (FATIMA ultimate solution)

  12. Option 1- Analogue QDC Lemo-RN adapters Robinson Nugent HD Flat dynode Energy Lemo Analogue Current Delay LaBr3 PMT BNC Lemo Analogue Gate Clk sync BNC N108 Robinson Nugent HD Flat Robinson Nugent HD Flat anode A967 adapter QDC V862 TS Diff ECL X16 x2 Lemo Analogue For 30 channels: 2x V812 CFD (16ch) 2x N638 xlators (16ch) 8x Phillips 794 G+D (4ch) 1x V1290A TDC (32ch) 1x V862 QDC (32ch) 1x A967 adapter 30x N108 delay (2x64ns) 1x v1495 with 2x A395A ECL inputs and 1 A395D NIM i/o 1 VME crate + CPU 2 NIM crates (N108s don’t need crates) Diff ECL X16 x2 Diff ECL X16 Lemo NIM Diff ECL X16 Lemo NIM Diff ECL single Time Optional -See notes Stop ECL-NIM 726/N638 G+D 794 Diff ECL X16 x2 V1495 (2xA395A 1x A395D) User Logic Lemo NIM Common Start AIDA or Beam TDC V1290A CFD V812

  13. Clk & sync Option 2- Partially digital (XIA) dynode Current Energy & TS LaBr3 PMT BNC SMA (XIA supply BNC adapter) BNC anode XIA DGF4 Diff ECL X16 Stop Time Lemo Analogue Diff ECL X16 x2 For 30 channels: 2x V812 CFD (16ch) 1x V1290A TDC (32ch) 8x DGF4 (4ch) 1 VME crate and CPU I Camac crate PC with 9 USB ports to read DGF4s Common Start AIDA or Beam CFD V812 TDC V1290A

  14. Clk & sync Option 3- Fully digital (FATIMA based) dynode Current Time, Energy & TS LaBr3 PMT anode Should we use dynode or anode? Dynode used for timing in analogue setup Digitiser with FPGA e.g. V1751, STR3305, or Perseus+AD5000 For 30 channels: 8x V1751 (4ch)/STR3305 (4ch) 1 VME crate and CPU Or 8x Perseus + AD5000 1 uTCA crate and CPU

  15. While we are waiting… • A number of ‘test’ (and new physics) experiments at the Bucharest tandem using the mixed Ge-LaBr3 array (including 3 ‘UK’ LaBr3 dets). • Results / Experiments include • Ip=4- intruder state half-life in 34P19 (f7/2→d3/2 M2 single particle decay) • N=80 Ip=6+ half-lives (138Ce) • 186W(7Li,ap) reactions, e.g., 188W (Ip=2+) • 208Pb(7Li,a2n) 209Bi (sp decays)

  16. Expected, E1/2 dependence of FWHM on gamma-ray energy. T.Alharbi et al., Applied Radiation and Isotopes, 70, 1337 (2012)

  17. R(%)= [DEg / Eg ]*100 P.H. Regan Applied Radiation and Isotopes, 70 1125 (2012)

  18. Tests with 152Eu source (measure lifetime of Ip=2+ 121 keVlevel in 152Sm

  19. T1/2=1.38 ns

  20. 18O(18O,pn)34P. s~20 mb T1/2 (Ip=4-) = 2.0(1) ns Mostly nf7/2→nd3/2 M2 transition

  21. {1876,429} D=470(10)ps {1048,429} T1/2=2.0(1)ns

  22. 1f7/2 1f7/2 20 20 1d3/2 1d3/2 2s1/2 2s1/2 1d5/2 1d5/2     34P19 (Simple) Nuclear Shell Model Configurations • Theoretical predictions suggest 2+ state based primarily on [2s1/2 x (1d3/2)-1] configuration and 4- state based primarily on [2s1/2 x 1f7/2] configuration. • M2 decay can go via nf7/2→ nd3/2(Dj=Dl=2) transition. I = 2+ [2s1/2 x (1d3/2)-1] I = 4- [2s1/2 x 1f7/2] 15 protons19 neutrons 15 protons19 neutrons

  23. 1f7/2 1f7/2 20 20 1d3/2 1d3/2 2s1/2 2s1/2 1d5/2 1d5/2     34P19 (Simple) Nuclear Shell Model Configurations • Theoretical predictions suggest 2+ state based primarily on [2s1/2 x (1d3/2)-1] configuration and 4- state based primarily on [2s1/2 x 1f7/2] configuration. • M2 decay can go via nf7/2→ nd3/2(Dj=Dl=2) transition. I = 2+ [2s1/2 x (1d3/2)-1] I = 4- [2s1/2 x 1f7/2] 15 protons19 neutrons 15 protons19 neutrons

  24. 1f7/2 20 1d3/2 2s1/2 1d5/2   34P19 (Simple) Nuclear Shell Model Configurations • Theoretical predictions suggest 2+ state based primarily on [2s1/2 x (1d3/2)-1] configuration and 4- state based primarily on [2s1/2 x 1f7/2] configuration. • M2 decay can go via nf7/2→ nd3/2(Dj=Dl=2) transition. M2 s.p. transition I = 2+ [2s1/2 x (1d3/2)-1]

  25. 1f7/2 1f7/2 20 20 1d3/2 1d3/2 2s1/2 2s1/2 1d5/2 1d5/2     • Theoretical predictions suggest 2+ state based primarily on [2s1/2 x (1d3/2)-1] configuration with some small admixture of [1d3/2 x (1s1/2)-1] • 4- state based primarily on [2s1/2 x 1f7/2] configuration. • E3 can proceed by f7/2→ s1/2 (Dj=Dl=3 transition). • Admixtures in 2+ and 4- states allow mixed M2/E3 transition. I = 2+ [1d3/2 x (2s1/2)-1] I = 4- [2s1/2 x 1f7/2] 15 protons 19 neutrons 15 protons 19 neutrons

  26. T1/2=2ns {1048}{429} T1/2<2ps ‘Prompt’ DT~480ps {429}{1876} P.J.Mason et al., Phys. Rev C85, 064303 (2012)

  27. 138Ce80

  28. {815,165} {815,467}

  29. …partial fusion reactions (low cross-sections)

  30. Lifetime of first-excited 2+ in 188W • 186W(7Li,p)188W, 33 MeV • Reaction mechanism is a mix of incomplete fusion and low-energy transfer. • ~54 hours beam time • Analysed by P.J.R. Mason. T. Shizuma et al. Eur. Phys. J. A30, 391 (2006) 296 keV gate (HPGe) 432 keV gate (HPGe) Contaminants are 186Os 189Ir

  31. Lifetime of first 2+ in 188W Time difference 143-432 keV Contaminated by 186Os [t1/2(2+) = 875(15) ps] • Estimate of 188W 2+ half-life from this short run gives unusual behaviour in B(E2).

  32. Fast-timing following b- decay….

  33. 190Os levels from EC decay of 190Ir Yamazaki et al., NPA131 (1969) 169-179 P.J. Mason et al., 186W(7Li,2n)191Ir performed at Bucharest Tandem

  34. 190Os levels from EC decay of 190Ir Yamazaki et al., NPA131 (1969) 169-179 T1/2 from Dt of 187keV and (361 or 371)} = 375 (20) ps P.J.Mason et al., private communication

  35. ….the (near) future • 21 detectors to EURICA • 7/8 detectors for EXOGAM@ILL

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