1 / 13

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

delila
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related