1 / 20

JASMIN Results and Plans ○ Shun SEKIMOTO , H. YASHIMA (Kyoto University)

JASMIN Results and Plans ○ Shun SEKIMOTO , H. YASHIMA (Kyoto University) H. MATSUMURA, A. TOYODA (KEK) K. OISHI,(Shimizu Corporation) N. MATSUDA, Y. KASUGAI, Y. SAKAMOTO, H. NAKASHIMA (JAEA) D. BOEHNLEIN, G. LAUTEN, A. LEVELING, N. MOKHOV, K. VAZIRI (FNAL). JASMIN

lel
Download Presentation

JASMIN Results and Plans ○ Shun SEKIMOTO , H. YASHIMA (Kyoto University)

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. JASMIN Results and Plans ○ Shun SEKIMOTO, H. YASHIMA (Kyoto University) H. MATSUMURA, A. TOYODA (KEK) K. OISHI,(Shimizu Corporation) N. MATSUDA, Y. KASUGAI, Y. SAKAMOTO, H. NAKASHIMA (JAEA) D. BOEHNLEIN, G. LAUTEN, A. LEVELING, N. MOKHOV, K. VAZIRI (FNAL) JASMIN (Japanese-American Study of MuonInteractions and Neutron detection) Collaboration

  2. JASMIN Results and Plans JASMIN (Japanese-American Study of MuonInteractions and Neutron detection) Collaboration -Contents- 1. Chemical Analysis of Gas at AP0 target station 2. Chemical Analysis of Cooling water from AP0 and NuMI 3. Activation experiments in NuMI for muon-induced nuclear reactions

  3. Concrete shielding Air gap Iron shielding 120 GeV proton target room Inconel target 1. Chemical Analysis of Gas at AP0 target station # Collection of radioactive aerosols from the AP0 target vault using Impactor method # Separation of radioactive aerosols into several samples according to particulate size ranging from 0.056 to 10 mm Anti-proton target station (AP0)→ Ave. beam current: 250-290 nA To know particle size of those radioactive aerosols →For the radiation control purposes, especially for evaluating the internal exposure of the workers.

  4. Experimental (Aerosol-sampling) (3h sampling) Gas/ aerosol-sampling device↓ Filter holder Flow meter Impactor Concrete shielding Pump Iron shielding Target room 120 GeV proton target

  5. Experimental (Aerosol-sampling) ←Impactor 10 stages for particles with 0.056 to 10 mm diameter # Collected on Aluminum foil # 30 L of air /min of flow rate # 3 h-sampling (≈ 5.4 m3 of air in total) # gamma-ray spectrometry # Separation of radioactive aerosols into several samples with different particle size Results: 14 nuclides →Be-7, Na-22, Na-24, Sc-46, Sc-47, V-48, Cr-51, Mn-54, Co-56, Co-57, Co-58, Co-60, Au-196, Au-198

  6. Results: Particle size distribution Be-7 (T1/2: 53.3 d) GMD: Geometric mean diameter

  7. Discussion: Half life vs. particle size distribution →Fromthe correlation, growing up of aerosols in the accelerator target room could be discussed. V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60 GMD (μm) Au-198 Sc-47 Au-196 Na-24 Half-life (day)

  8. Half life vs. particle size distribution (target room) ●　Feb_2010 ○Dec_2010 Sc-44m Au-198 Sc-47 Mn-52 Au-196 GMD (μm) V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-24 Half-life (day)

  9. Study of colloid formation in cooling-waters (Experiments in Feb. 2010, Dec. 2010, and Sep. 2011) Five Major IMPORTANT Results (1) radiocolloid formation rates in the cooling waters are significantly high, (2) radiocolloid formation rate depends on the cooling water system, (3) remaining rate of Be-7 in the cooling-water depend on water purification system, (4) radiocolloid takes positive charge, (5) weak retention of colloid with cation-exchange resin was observed. Equipped water purification system Remaining rate in cooling-water In case of Be-7 NuMI Filter & Ion-exchange 0.002 -0.05% Pbar ~5% Filter Colloid Ion

  10. Study of muon-induced nuclear reactions at NuMI Three Major IMPORTANT Results (1) split muon beam came into the NuMI absorber hall, (2) nucleus excitation by muon is similar to by real photon (see Figs.1 and 2), (3) a reaction channel that have not been observed in bremsstrahlung-induced reaction was observed in muon-induced Au spallation (see Fig. 3). Fig.1 similar to by real photon Deposit energy into target nucleus Mass yield distribution in Au target = Fig.3 Cu target Cu target Velocity of nucleus at 1st step of nuclear reaction similar to by real photon = a reaction channel that have not been observed in bremsstrahlung-induced reaction Fig.2

  11. [×104] Au-198 2.696 d (dA0/dlndp) Na-24 14.96 h Sc-47 3.35 d Au-196 6.183 d

  12. V-48 15.97 d Cr-51 27.7 d (dA0/dlndp) Particle diameter (dp, m) Co-58 70.86 d Co-56 77.26 d

  13. Sc-46 83.82 d Co-57 271.8 d (dA0/dlndp) Particle diameter (dp, m) Na-22 2.603 y Mn-54 312.2 d

  14. Discussion: Half life vs. particle size distribution Restart of AP0-operation →サプリング: 2010.2月 Growing up of aerosols Na-24 Au-198 Sc-47 Au-196 V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60 Na-24 Au-198 Sc-47 Au-196 V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60 Na-24 Au-198 Sc-47 Au-196 V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60 Na-24 Au-198 Sc-47 Au-196 V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60 Na-24 Au-198 Sc-47 Au-196 V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60

  15. Discussion: Half life vs. particle size distribution Restart of AP0-operation →6 month→Aerosol-sampling Growing up of aerosols Na-24 Au-198 Sc-47 Au-196 V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60 Na-24 Au-198 Sc-47 Au-196 V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60 Na-24 Au-198 Sc-47 Au-196 V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60 Na-24 Au-198 Sc-47 Au-196 V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60 Na-24 Au-198 Sc-47 Au-196 V-48 Cr-51 Be-7 Co-58 Co-56 Sc-46 Co-57 Mn-54 Na-22 Co-60

  16. Co-60 5.272 y

More Related