Скачать презентацию Light Radioactive Beam Production via Two Stage Irradiation Скачать презентацию Light Radioactive Beam Production via Two Stage Irradiation

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Light Radioactive Beam Production via Two Stage Irradiation Setup Tsviki Hirsh Soreq NRC, Yavne Light Radioactive Beam Production via Two Stage Irradiation Setup Tsviki Hirsh Soreq NRC, Yavne 81800, Israel Weizmann Institute of Science, Rehovot, Israel PANIC conf. 13. 11. 2008

Outline 1 The physics case for intense light RIB. 2 Technologies for intense low Outline 1 The physics case for intense light RIB. 2 Technologies for intense low energy deuterons beam driver. 3 The two stage production method and simulations. 4 (n, ) production preliminary results. 5 Future planned experiments. 2

Objectives RNB High Yield Production of 6 He and 8 Li 3 Objectives RNB High Yield Production of 6 He and 8 Li 3

Astrophysics and Nuclear Physics with Light RIB 4 He(8 Li, n)11 B reaction Ishiyama Astrophysics and Nuclear Physics with Light RIB 4 He(8 Li, n)11 B reaction Ishiyama et al. , Physics Letters B 640 (2006) 82– 85 Terasawa et al. , Astrophysical J. , 562: 470 -479, 2001 November 20 4

Beta Beam 9 Be(n, α)6 He βt 0. 5= 807 ms 6 He 11 Beta Beam 9 Be(n, α)6 He βt 0. 5= 807 ms 6 He 11 B(n, α)8 Li βt 0. 5= 838 ms 8 Li 130 km 65 m d Linac Double Target 65 m 65 m 65 m P. Delahaye, “The beta-beam project in the EURISOL context”, Quantum Seminar, Mainz (2006) http: //beta-beam. web. cern. ch/beta-beam/ 5

SPIRAL 2 - GANIL Marek Lewitowicz, SPIRAL 2 Week, Nov (2007) 6 SPIRAL 2 - GANIL Marek Lewitowicz, SPIRAL 2 Week, Nov (2007) 6

SARAF - Soreq deuterons / protons linear accelerator 6 SMs 5 Me. V at SARAF - Soreq deuterons / protons linear accelerator 6 SMs 5 Me. V at Phase 1 with only 1 SM (2008) βo=0. 15 40 Me. V at Phase 2 with 6 SMs (2013) RFQ 2 m. A current • Nagler, LINAC 2008 • Piel, EPAC 2008 • Pekeler, LINAC 2006 7 βo=0. 09

Neutrons Spectrum of a 40 Me. V Deuterons Beam on a Thick Lithium Target Neutrons Spectrum of a 40 Me. V Deuterons Beam on a Thick Lithium Target 40 Me. V , 250 m. A Lithium Converter 40 Me. V , 5 m. A Carbon Converter 40 Me. V , 2 m. A Lithium Converter Other possible converters: Beryllium, Water, Heavy water M. Hagiwara et al. Fus. Sci. Tech. , 48 (2005). 8

Optimization Calculations MCNPTM Monte Carlo N-Particle transport code Expected Yields for a Be. O Optimization Calculations MCNPTM Monte Carlo N-Particle transport code Expected Yields for a Be. O target: SARAF (40 Me. V, 2 m. A): 8∙ 1012 [6 He/sec] SPIRAL 2 (40 Me. V, 5 m. A): 2∙ 1013 [6 He/sec] Expected Yields for a BN target: SARAF (40 Me. V, 2 m. A): 2∙ 1012 [8 Li/sec] Hass et al. , J. Phys. G: Nucl. Part. Phys. , 35, 014042 (2008). 9

Simulations: 2 D Slice Inside The Secondary Target 10 Simulations: 2 D Slice Inside The Secondary Target 10

Simulations: 6 He Production Inside a 2 D Slice of the target Cone shaped Simulations: 6 He Production Inside a 2 D Slice of the target Cone shaped target * RT stands for the distance between the two targets 11

Oxide Fibers Ti. O 2 Zr. O 2 § Be. O 2 mm disks Oxide Fibers Ti. O 2 Zr. O 2 § Be. O 2 mm disks § 23 mm diameter § Purity of 99. 9% Be. O § ~500 ppm impurities § 50%-75% density § Grain size 20 micron U. Koster, “Oxide Fiber Targets at ISOLDE” , Nuc. Ins. Meth. Phys. Res. B 204 (2003) 12

Present and Future Experiments γ 27 Al(n, α)24 Na NG β 11 BN(n, α)8 Present and Future Experiments γ 27 Al(n, α)24 Na NG β 11 BN(n, α)8 Li Production extraction 9 Be. O(n, α)6 He Phase 1 / Ganil / ISOLDE Monte Carlo Simulations Production 11 BN(n, α)8 Li NG / Phase 1 27 Al(n, α)24 Na β Monte Carlo Simulations 15. 2. 2008 Aluminum cubes irradiation experiment number 1. Preliminary experiment for verification of target geometry in compare to Monte Carlo simulations. 9 Be. O(n, α)6 He Production extraction Monte Carlo Simulations 28. 4. 2008 Aluminum cubes irradiation experiment number 2. Preliminary experiment for verification of target + reflector geometries in compare to Monte Carlo simulations and previous experiment. 6 He production and extraction numbers 13

Aluminum Cubes Experiment 1. 4∙ 109 n/s T. Y. Hirsh et al. Po. S(NUFACT Aluminum Cubes Experiment 1. 4∙ 109 n/s T. Y. Hirsh et al. Po. S(NUFACT 08)090, 2008. 14

8 Li • 8 Li Production Experiment production measurement. • 11 BN(n, )8 Li 8 Li • 8 Li Production Experiment production measurement. • 11 BN(n, )8 Li by fast neutrons. • Automatic measurement system using a fast air-pressure rabbit. • Detection of betas from 8 Li decay. • A benchmark for simulations. • 6 He production is also possible by replacing the target by Be. O. 3 sec irradiation 0. 1 sec movement time 15 3 sec measurement

SARAF Phase I Li. T 2009 BD D-Plate • 5. 2 Me. V and SARAF Phase I Li. T 2009 BD D-Plate • 5. 2 Me. V and 2 m. A deuterons beam. • Production of fast neutrons by placing a light isotopic target with high positive Q-value (probably Al/BN/Li or 13 C). • We are planning to repeat the experiments of Aluminum and BN irradiation by using these neutrons PSM EIS RFQ LEBT 16

Proposed ISOLDE Porous Be. O Experiment Option for experiment at GANIL: Production and extraction Proposed ISOLDE Porous Be. O Experiment Option for experiment at GANIL: Production and extraction of 8 Li Boron-Nitride powder target Fast neutrons from 12 C(12 C, n) reactions 17

Summary 1. Presented simulations and tests for production of secondary-fast neutron induced RIB production. Summary 1. Presented simulations and tests for production of secondary-fast neutron induced RIB production. 2. Planned future experiments – including extraction and ionization yields. 3. Towards a specific design of a target for SPIRAL 2 and/or SARAF. 4. Driver accelerator parameters (current and energy) are NOT yet optimized for beta-beam purposes (e. g. , 8 Li, 18 Ne) – to be addressed. 18

Acknowledgments Michael Hass Vivek Kumar Kuljeet Singh Dan Berkovits Leo Weissman Yoram Nir-El Francois Acknowledgments Michael Hass Vivek Kumar Kuljeet Singh Dan Berkovits Leo Weissman Yoram Nir-El Francois de Oliveira Marek Lewitowicz Mats Lindroos Theirry Stora 19