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S.-L. Guo China Institute of Atomic Energy, Beijing, China

Study of bubble distributions by high-energy protons in bubble detectors and its hints in neutron detection at higher altitude and in space. S.-L. Guo China Institute of Atomic Energy, Beijing, China T. Doke et al., Waseda University, Tokyo, Japan

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S.-L. Guo China Institute of Atomic Energy, Beijing, China

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  1. Study of bubble distributions by high-energy protons in bubble detectors and its hints in neutron detection at higher altitude and in space S.-L. Guo China Institute of Atomic Energy, Beijing, China T. Doke et al., Waseda University, Tokyo, Japan D.-H. Zhang, Shanxi Normal University, Linfen, China M. Komiyama, RIKEN, Japan N. Yasuda et al., NIRS, Japan

  2. 1. Introduction Primary Cosmic Rays Secondary Cosmic Rays n → bubbles p ? ? dose This work BD

  3. 2. Bubble Detectors and Irradiation Large size: BD: China Institute of Atomic Energy 23 cm Stop trajectory track

  4. Irradiation p cyclotron, RIKEN, Japan Cyclotron Scint. D Stopper BD AcrylicAlAl p stop 210 MeV 105.5 MeV Arrangement of irradiation

  5. p + T -14 3. Bubble distribution and categories

  6. Bubble distribution and categories T-24 Fluence 8,333 p/cm2 8,333 2,083 416.7 83.3 41.7 p high density low density • Random • Abrupt change , density • L = R • (4)~ fluence, p/cm2

  7. Bubble categories (1) Scattering bubbles (2) Recoil bubbles (3) Intrinsic bubbles

  8. 4. Bubble density distribution T-14 T-24 T-12 • Two terraces • Steep drop • Higher terrace = Recoil bubbles + Scattering bubbles + Intrinsic bubbles • Lower terrace = Scattering bubbles + Intrinsic bubbles • _______________________________________________________________________ • Difference = Recoil bubbles • Recoil bubble density ----- unique

  9. 5. Results of measurements Detection efficiency for protons via recoil bubbles

  10. ε En ε(n) ≈ 1.5×10-4 Visible depth: 3 mm ε(n) ≈ 5× 10-4 ε(p) = 4.7±1.7×10-2 ≈ 102 6. Comparison with detection efficiency for neutrons T-12 2% R-12 20 keV ~ 19 MeV 0.3 — 19 MeV 100 times higher for protons Origin: Rutherford scattering p + C, F, Cl → Recoil nuclei →bubbles.

  11. 7. Conclusions (1) 3 types of BD + p • Proton delection efficiencies • Neutron detection efficiency (4) Rutherford scattering !!! Cosmic ray protons → forming bubbles !!! Space neutron dose ←?→ bubble number Non Simple

  12. Thanks

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