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 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
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 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
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 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 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: 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 § 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 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 08)090, 2008. 14
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 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 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. 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 de Oliveira Marek Lewitowicz Mats Lindroos Theirry Stora 19
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