Day-one photonuclear physics at ELI-NP

Transcription

1 Extreme Light Infrastructure-Nuclear Physics (ELI-NP) - Phase II Day-one photonuclear physics at ELI-NP Dimiter L. Balabanski Advanced many-body and statistical methods in mesoscopic systems III, Busteni, September 4 th -8 th, 2017 Project co-financed by the European Regional Development Fund through the Competitiveness Operational Programme Investing in Sustainable Development

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3 bw ph/(mm 2 mrad 2 s 0.1%bw) ELI-NP Gamma Beam System (GBS) E 2 2 e 1 e 1 cos 2 a 2 0 L Strong forward focusing 4 ee mc L 2 E L Brilliance LNBL PLEIADES T-REX HIGS MEGA-ray ELI NP year PLEIADES Dynamitron HIGS T-REX ~ 4γ2 E L Bandwidth Laser Compton backscattering (LCB) Narrow bandwidth ( 0.3%) gamma-beams up to 19.5 MeV year + MEGA-ray ELI NP

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5 what to remember beam size: 1 mm at 10 m away from collimator energy spread: 50 kev at E γ =10 MeV time structure: micropulses at 16 ns photons/pulse: 10 5 photons/macro-pulse: 32 x 10 5 =3 x 10 6 photons/s: 3 x 10 8

6 beam diagnostics Spatial parameters: source diameter, beam width (at target), beam divergence, beam instability Temporal parameters: micropulse duration and separation, number of pulses in train, macropulse separation Spectral parameters: beam bandwidth and beam polarization Power parameters: average brilliance at peak energy, peak brilliance at peak energy, time-average spectral density at peak energy and off peak energy 10 ms (100 Hz) 16 ns 16 ns >31 pulses for J/pulse

7 Experiments with high-brilliance gamma beams at ELI-NP S. Gales et al., Phys. Scr. 91, (2016) TDRs: > 300 scientists involved separation threshold n, p, α, ff g.s. (Z, N) (Z, N ) photoactivation (Z ±1, N 1) ± Nuclear Resonance Fluorescence (NRF) Rom. Rep. Phys. 68, S483 (2016) Giant/Pigmy Resonances (GANT) Rom. Rep. Phys. 68, S539 (2016) Photodisintegration (γ,n), (γ,p), (γ,α) Rom. Rep. Phys. 68, S699 (2016) Photofission (γ,ff) Rom. Rep. Phys. 68, S621 (2016) Applications Rom. Rep. Phys. 68, S735 (2016), ibid 68, S799 (2016), ibid 68, S847 (2016)

8 ELIADE array in collaboration with U. Koeln and TU Darmstadt NRF experiment at ELI-NP Rom. Rep. Phys. 68, S483 (2016) detector tests are ongoing array design is at a final stage day-one experiments are under discussion γγ coincidences angular distributions polarization measurements First in-beam test: Dec , 2016

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10 Prompt gamma rays spectrum

11 ELI-NP NRF physics cases Rom. Rep. Phys. 68, S483 (2016) Self-absorption measurements (Γ 0 /Γ i ) Low-energy dipole response (e.g. Actinides) Dipole response and parity measurements for weakly-bound nuclei Investigation of the Pigmy Dipole Resonance Rotational 2 + states of the scissor mode Constraints on the 0νββ-decay matrix elements of the scissors mode decay channel: 150 Sm Availability frontier p-nuclei and actinides Sensitivity frontier week channels Precision frontier high statistics

12 Belic D et al Phys. Rev. C Belic D et al Phys. Rev. Lett Day-zero: Photoactivation of 180 Ta (ISAB recommendation)

13 Day-one: Separation of the parity doublet in 20 Ne (ISAB recommendation) advantages at ELI-NP Large volume Clover detector array Higher brilliance of the γ beam Narrow band-width: 0.3% vs 3% at HIγS Simultaneous measurement of polarization with ELIADE and within each Clover detector Beller J et al Phys. Lett. B

14 GANT experiment at ELI-NP ELIGANT-GN array 30 LaBr 3 or CeBr Li glasses 30 Lq. Scint. Rom. Rep. Phys. 68, S539 (2016) Day ONE: studies of GDR and PDR decay ( 90 Zr, 208 Pb) combine with information from (γ,n) experiments combine with information from (γ,γ ) experiments (e.g. polarization) γ-decay to gs and excited states as a function of excitation energy ELIGANT-GN ELIADE E8

15 EJ-301 liquid scintillators & RoSPHERE detector array Spectroscopy and lifetime measurements of low-lying T = 0,1 states in 62 Ga

16 discrimination n- discrimination with EJ-301 liquid scintillation detectors neutrons gammas energy

17 ELIGANT Physics program Gamma above neutron threshold experiments at Extreme Light Infrastructure - Nuclear Physics CLES/LANSA April 2017 Yokohama

18 8 m 2 m ELIGANT-GN E8 experimental area 5 m ELIADE 1.5 m Major instruments for the Nuclear Photonics experimental program

19 RCNP Osaka vs. ELI-NP experiments Day-one: 208 Pb (γ,γ ) E1 strength measurement (ISAB recommendation) RCNP High-resolution (p,p ) measurement at 0⁰ and forward angles A. Tamii, NIM A605, 326 (2009) ELI-NP High-resolution (γ,γ ) + (γ,n) measurement experiment: polarized (>99%) γ beam simultaneous (γ,γ ) + (γ,n) measurement = A. Tamii, PRL 107, (2011)

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21 ELIGANT-THN array 30 3 He counters 40% detector efficiency (γ,n) cross-section experiment at ELI-NP Rom. Rep. Phys. 68, S539 (2016)

22 3 He Counters energy spectrum Very good γ-n separation Real 3 He counter spectrum 252 Cf source 191 kev 3 H full energy deposition 573 kev p full energy deposition

23 Day-zero: Measurement of the 9 Be(γ,n) cross section (ISAB recommendation) Unsunomiya H et al Phys. Rev. C Arnold C W et al Phys. Rev. C

24 Readout plane PCB Front-end GET electronics ELITPC flagship experiment: 16 O(γ,α) 12 C Gas port HV BNC connectors Detector upside-down view Beam port Mountable handles for base-plate manipulation Source ports Vacuum port The mini-etpc detector with 256-channel readout was built and successfully tested in-beam at the IFIN Tandem in 2016

25 mini-tpc event recognition e-tpc, tests o-tpc, HIγS Zimmerman W R et al Phys. Rev. Lett Bihałowicz J S 2015 AIP Conf. Proc

26 C. Matei et al., exp. at HIγS in March 2017

27 DSSD testing at ELI-NP Chesnevskaya S et al JINST (in preparation)

28 Photofission: Physics goals Rom. Rep. Phys. 68, S621 (2016) The program is convened by F. Ibrahim (IPNO) and A. Krasznahorkay (ATOMKI) 1. High-resolution photo-fission studies in actinides as a function of the photon energy study of the fission resonances, investigation of 2 nd, 3 rd potential minima, mapping the fission barrier 2. Angular distribution measurements for the fission fragments. Study of the J π and K-values of the resonances 3. Mass and charge distribution measurements for the fission fragments study of the clusterization before fission 4. Study of the ternary fission probability as a function of the photon energy direct proof for highly deformed states 5. Study of the true ternary fission. clusterization

29 Note: Nuclear structure correlations influence the fission probability see also ELI-NP White Book: contributions of P. Thirolf and D. Habs

30 Photofission experiments at ELI-NP ELI-BIC Rom. Rep. Phys. 68, S621 (2016) BIC prototype tested with sources and in-beam Array of Bragg ICs coupled to Si DSSD based E-E detectors

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32 ALTO, ARIEL, etc. ELI-NP Laser Compton backscattering γ beam spectrum at the IP (without collimator) ~ γ/s

33 IGISOL beamline: Location E9 Location 1: - CSC at 7m from IP A 0.7cm - maximum CSC length 1.5m - crowded exp hall! Location 2: - CSC at 40m from IP A 4cm - plenty of space!

34 IGISOL facility at ELI-NP Rom. Rep. Phys. 68, S621 (2016) double-chamber CSC P. Constantin et al, NIM B 378, 78 (2016), ibid (2016) submitted beam extraction target assembly RF carpets DC electrodes Laval nozzles segmented anode Studies of gas-flow dynamics funded by the Romanian Science Agency Work in collaboration with GSI, Darmstadt and University of Giessen

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36 Next phases of ELI-NP beyond

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38 Gamma Beam System Implementation Schedule Gamma Beam System Implementation 3 MeV May 19.5 MeV June Commissioning Experiments Open access facility

39 Summary the instrumentation of the ELI-NP GBS experimental program is been implemented according to the project timeline; the physics cases, which will be addressed, have been prepared within a broad scientific community; commissioning and day-one experiments are currently under discussion; the ELI-NP GBS is expected to provide beam to the users in 2019.

40 Thank you! ELI-NP Team, March 5, 2013