Nuclear-Plasma Interactions on highly excited states Workshop on Level Densities and Gamma Strength University of Oslo Oslo, Norway
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1 Nuclear-Plasma Interactions on highly excited states Workshop on Level Densities and Gamma Strength University of Oslo Oslo, Norway Lee Bernstein May 27, 2013
2 Collaborators We need lots of them! D.H.G. Schneider, W. Stoeffl, R. Bionta, D.L. Bleuel, C. Cerjan, J.A.Caggiano, R. Fortner, P.M. Grant, A. Kritcher, L. Dauffy, R. Hatarik, C. Hagmann, K. Moody, D.P. McNabb, J. Gostic, D. Shaughnessy, D. Sayre, C. Yeamans LLNL B. Goldblum, N. M. Brickner, J. A. Brown, B. H. Daub, P. F. Davis, K. Van Bibber, J. Vujic U.C. Berkeley S. Siem, F. Giacoppo, A. Gorgen, T. Renstrøm, A.C. Larsen, M. Guttormsen U. of Oslo G. Gosselin, P. Morel, V. Meot CEA-DAM (BIII) M. Wiedeking ithemba Labs C. Brune, T. Massey, A. Schiller Ohio U. R.B. Firestone, S. Basunia, A. M. Hurst, A. Rogers LBNL M. Wiescher Notre Dame K.-H. Langanke GSI s2.ppt Bernstein Science on NIF TRC, January 8,
3 Introduction Neutron-rich High Energy Density Plasmas (nhedp) at the National Ignition Facility Nucleosynthesis in stellar nhedps Results from NIF 196m Au/ 196g Au Other planned and potential experiments NIF-based exploding pusher with 134 Xe Accelerator-based using Au beams Petawatt-laser beam-target experiment (Au) Final questions/summary Nuclear Level Density and Radiative Strength is crucial to understanding the formation of elements in nhedps 9
4 NIF concentrates all 192 beam energy in a football stadium-sized fac.
5
6 Flux (n/s/cm 2 ) The high e, g and n-flux in a NIF capsule might allows us to explore reactions on short-lived nuclear states NIF capsule/hohlraum Step #2 Step # { { Capsule Hohlraum electrons Hohlraum Capsule electrons LANSCE Hohlraum Reactor Capsule SNS Hohlraum Capsule Capsule Hohlraum (WNR) Neutrons Plasma NIF Dense g/cm 3 Reactions on excited nuclear states High Neutron Flux cm -2 s -1 (fluence= cm -2 ) Hot kt=1-100 kev Josh Brown Pre-pizza talk! Excited State Reaction Possibilities Option #1: Excite a target nucleus with the plasma then hit it with neutrons Option #2: Excite a target nucleus with neutrons then interact with the plasma
7 Roughly half of the elements with 26 Z 83 are formed via slow neutron capture in an astrophysical high energy density plasmas x3 F. Kappeler et al., has shown that modeled (n,g) cross sections are highly uncertain Goal: ±30% accuracy = Prediction from 6 leading modeling groups prior to measurement = Measured value x neutrons crams 2800 years* of neutron capture into every shot Can we use NIF to study the effects of the HEDP on (n,g) nucleosynthesis? *Busso, Gallino and Wasserburg, Annu. Rev. Astron. Astrophys : R.A. Ward, Ap. J. 216: , 1977, Z.S. Nemeth et al., Ap. J , (1994) T. Hayakawa, et al., AIP Conf. Proc. 1238, 225 (2010), doi: /
8 Electron-driven Nuclear-Plasma Interactions (NPI) are most likely to cause the excitation of kev nuclear states Photo-absorption Time Reverse: g-ray decay Atomic-nuclear (electron) interactions NEEC, NEET, IES* Time Reverse: IC-decay e free/bound e free/bound N N* N F(E g ) - Radiative Strength Function N* Radiative Dielectronic Photons F(E g ), r(e x,j π ) HEDP electrons Atom photons Nucleus Recombination Photons Can we use NIF to see if these interactions fast enough to interact with highly excited nuclear states in a HEDP?
9 First hints of NPI at NIF: Radioactive 196 Au and 198 Au from (n,2n) and (n,g) on the 197 Au hohlraum Passive Particle Detector Blast Shield removed post-shot & counted Diagnostic Insertion Manipulator (DIM) 50 cm Equatorial DIM Time Sequence 1. Shot hours later DIM removed, samples collected and transported to Building 151 counting facility days later data becomes available 9
10 Counts The 10 hour 12 - isomer in 196 Au might allow us to explore the interaction of highly-excited states with a HEDP? 197 Au(n,2n) 196m Au 197 Au(n,2n) 196g Au N SRC data DT cryo with Y 14 =5x10 14 S n =6.642 MeV Energy (kev) r 1 ev -1 { Fraction feeding isomer G 1 ev Ground State Isomer 12 - { 2 - r 1 ev -1 Vacant electron orbital 197 Au 196 Au This is entirely new Nuclear Physics 11
11 Radioactive 196Au collected from the pole and waist of the NIF come from very different plasma conditions Au N pole» 10-2 Au N equator D. Eder et a., UCRL-JRNL cm -3 Polar Au comes from a HEDP while equatorial Au does not
12 Is debris from the NIF hohlraum suggesting that the J π =12 - isomer feeding is being effected by NPIs? Measured 196m Au/ 196g Au value: 6.94±0.14% Measured 196m Au/ 196g Au Equator: 6.90±0.08% Pole: 6.31±0.27% D(Pole-Equator)=0.59% ± 0.28% ( 0 by s)
13 Option #2: A better NIF experiment using a 134 Xe-doped exploding pusher capsule We maximize both neutron flux and plasma density by placing a 134 Xe dopant nuclei in a direct-drive target d 2.19 d 133 Xe 11/2-3/2 + plus a control sample outside the plasma in a sample positioner 50cm from the target Glass/CH pusher (10 μm) DT gas 0.03% 134 Xe Fusion neutrons interact with Xe on way out of target Diameter of holder is 5cm same as SRC foil
14 Radioactive 133m.g Xe can be pumped out of NIF minutes after a shot using the RAGS (Radiochemical Analysis of Gaseous Samples) system Exploding pusher test: 124 Xe, 126 Xe-doped capsule NPI effects can observed using the Double-Isomer-to-Ground State (DIGS) Ratio R DIGS º N 133m Xe capsule N 133m Xe SRC N 133g Xe capsule N 133g Xe SRC Collection efficiency > 63% has been demonstrated
15 Option #2: A complementary accelerator-based experiment can also be performed using GeV Au beams R º N 198m Au close N 198g Au close N 198m Au far N 198g Au far 100 µm nat U target t>1 ns 1 µm 13 C target MeV/amu B. Daub (UCB) 6-8 MeV e - e - ~2.5-5 kev e - e Au 2 - < 1 MeV t 2 ps t 11 fs First test experiment fielded at LBNL 3/ Au formed, but no isomer was formed due to low beam energy (4.2 MeV/amu) t 0 fs To an accelerator beam, an ordinary target looks like an electron beam, a semi-ordered plasma. 13 C( 197 Au, 198 Au E 6-7 MeV ) 12 C Plasma Properties NIF LBNL Electron Fluence (cm -2 ) 3x Temperatures (kev) T e 5-50,T g =0.3 T e 2-20,T g =n.a.
16 New concept: We can use protons from a petawatt laser to make excited 196 Au via 198 Pt(p,3n) Target Normal Sheath Acceleration K. Markey
17 TNSA proton based nuclear-plasma experiment make 196m,g Au using the 198 Pt(p,3n) reaction Step #1: Use TNSA protons from a petawtt laser to make an excited nucleus via the 198 Pt(p,3n) 196m,g Au 200 µm P t f o i l Step #2: Use a long pulse (ns) laser to place the target nuclides into an HED plasma state First experiment: Platinum in a plasma state when the protons hit Control experiment: Platinum put into a plasma state after the protons hit
18 The TNSA proton spectrum can be estimated using recent state of the art results Results from Flippo (2008) at LANL show >10-fold increase in highenergy proton production in shaped targets. Laser power < 100 TW. 196 Au Spin Distribution (EMPIRE) 197 Au(n,2n) 198 Pt(p,3n) 197 Au(n th,g) The 198 Pt(p,3n) reaction is best drive by protons with 20 < E p (MeV) < 30 N p 5x10 9
19 Long-pulse laser produces a variety of plasma conditions 1D Radiation Hydrodynamics simulations complements of P.F. Davis Electron density vs. Radius Electron temperature vs. Radius Laser Laser Plasma Properties NIF TNSA Electron Fluence (cm -2 ) 3x Temperatures (kev) T e 5-50,T g =0.3 T e 0.2-3,T g =0.2
20 M. Wiedeking et al., Phys. Rev. Lett. 108, (2012) Summary Interactions between highly-excited nuclear states and HEDPS can profoundly effect nucleosynthesis We have hints of this happening right now at NIF Outstanding questions: Francesca Giacopo is analyzing What are an the Oslo appropriate data set right now designed to atomic rates? measure LD and RSF in 198,196 Au What is the ability of highly excited nuclei to absorb/emit virtual photons from NEEC/NEET? F(E g ) Bethany Goldblum and Darren Bleuel will tell you about other potential experiments and facilities to probe the J π dependence of LD and RSF What is the nuclear level density and width at E x S n including spin!
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