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8 B production measurement at LNL

8 B production measurement at LNL. VLADIMIR KRAVCHUK. 27.09.2010. CONTENTS. INTRODUCTION CROSS-SECTION MEASUREMENTS AND PRECISION ANGULAR DISTRIBUTION DIRECT KINEMATICS EXPERIMENTAL SET-UP: Facility: LNL-CN, Legnaro Detection system: RIPEN Neutron Detection Array TARGET CONCLUSION.

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8 B production measurement at LNL

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  1. 8B production measurement at LNL VLADIMIR KRAVCHUK 27.09.2010

  2. CONTENTS • INTRODUCTION • CROSS-SECTION MEASUREMENTS AND PRECISION • ANGULAR DISTRIBUTION • DIRECT KINEMATICS • EXPERIMENTAL SET-UP: Facility: LNL-CN, Legnaro Detection system: RIPEN Neutron Detection Array • TARGET • CONCLUSION

  3. 1. INTRODUCTION In the article of Rubbia et al. the 8B nucleus is considered as a neutrino source producing relatively high-energy neutrinos: The reaction proposed for the 8B production is: with the decay time of 0.77 s. In the same article the plot of the total cross section of the indicated process is demonstrated as a function of 3He incoming energies together with the incoming energies for the reverse kinematics:The optimum energy for collisions suggested in the article of Rubbia et al. is ~20 MeV for Li ions on He target. C. Rubbia et al., Nucl. Instr. and Meth. A 568 (2006) 475-487

  4. 2. CROSS-SECTION MEASUREMENTS AND PRECISION and references therein 1. What precision in the cross-section measurements is required for the project?

  5. 3. ANGULAR DISTRIBUTION Angular distribution is measured only until E(3He)=5.7 MeV 2. Presumably there is a need to measure the angular distribution. What angular resolution is required? 3. Do wee need to perform theoretical calculations (using presumably DWBA code) for the possible comparison with the experimental results and for the extension in the whole energy range of interest?

  6. 4. DIRECT OR REVERSE KINEMATICS? D. Neuffer, Nucl. Instr. and Meth. A 585 (2008) 109-116 LISE++ Kinematics Calculations 1) 8 MeV 3He (16 MeV 6Li) – intermediate case; 2) 10 MeV 3He (20 MeV 6Li) – optimum energy according to the articles of Rubbia et al. and Neuffer; 3) 5.5 MeV 3He (11 MeV 6Li) – energy with the maximum reaction cross-section from the data in literature. For each of the energy cases described above 4 calculations were performed: two-body direct kinematics 3He + 6Li -> 8B + 1n; elastic scattering direct kinematics 3He + 6Li -> 3He + 6Li; two-body reverse kinematics 6Li + 3He -> 8B + 1n; elastic scattering reverse kinematics 6Li + 3He -> 6Li + 3He. 4. What projectile energy shall we use in our measurements?

  7. 5. EXPERIMENTAL SET-UPSa) Internal options – LNL, Italyi) CN / RIPEN array DIRECT KINEMATICS • CN 3He beam can arrive up to an energy of 12 MeV (pulsed 2 ns); • Part of the RIPEN array (7 detectors) could be used for the neutron detection • Li target is available • We have to buy 3He

  8. RipeN Rivelatori per Neutroni a LNL 24 BC501 cylindrical Liquid Scintillators 12.7cm x 12.7 cm

  9. 6. TARGET 6Li target is available: diameter of the target is 6 cm,backing of 30 μm, thickness 300 μg/cm2, placed between two layers of carbon 15 μg/cm2 each

  10. 7. CONCLUSION We have started to write a proposal for a winter PAC/USP of Laboratori Nazionali di Legnaro.

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