実験セットアップ 輸送ソレノイド36 出口 ミューオン停止標的 マグネシウム 大きさ 37mm 8mm 厚さ 2mm Bz = 2. T 双極磁場 By=+.4 T トリガーカウンター プラスチックシンチレーター 磁場に耐性のあるMPPCで読み出し 厚さ 3.5mm μビーム μ ミューオンX線 ビーム中負ミューオンの位置分布 シミュレーション 遮 Mg標的の位置 9 X線検出器 ゲルマニウム検出器 (GL515R キャンベラ社製) 結晶 Φ25mm 厚さ15mm

energy spectrum 7 6 5 4 3 2 1 hist1 Entries 816 Mean 78.69 RMS 14.66 5 6 7 8 9 1 11 Energy [kev]

energy spectrum 7 6 5 4 3 2 1 hist1 Entries 816 Mean 78.69 RMS 14.66 5 6 7 8 9 1 11 Energy [kev]

energy spectrum 7 6 5 4 3 2 1 hist1 Entries 816 Mean 78.69 RMS 14.66 5 6 7 8 9 1 11 Energy [kev] hist2 energy spectrum 45 RMS hist2 16.66 energy spectrum 4 45 35 4 3 35 25 3 2 25 15 2 1 5 Entries 898 Mean 78.7 Entries 898 Mean 78.7 RMS 16.66 155 5 6 7 8 9 1 11 1 Energy [kev] 5 6 7 8 9 1 11 Energy [kev]

energy spectrum 7 6 5 4 3 2 1 hist1 Entries 816 Mean 78.69 RMS 14.66 5 6 7 8 9 1 11 Energy [kev] hist2 energy spectrum Mean 78.7 45 4 35 3 25 2 15 1 5 Entries 898 RMS 16.66 5 6 7 8 9 1 11 Energy [kev]

Ω Ω

Ω Ge Ω/4π Other Ge Ω/4π Other

Number of muons in beam /sec 211/1 2 18 16 14 12 1 8 6 4 2 5 1 15 2 25 3 35 4 45 5 Beam current [pa]

Number of muons in beam /sec 211/1 2 18 16 14 12 1 8 6 4 2 5 1 15 2 25 3 35 4 45 5 Beam current [pa]

8 7 6 5 4 3 hist_all Entries 9377 Mean 64.28 RMS 28.3 2 1 2 4 6 8 1 12 14 16 18 2

4 3.5 3 2.5 2 1.5 1.5.5.1.15.2.25.3

.2.18.16.14.12.1.8.6.4.2 momentum h1 Entries 232 Mean 66.49 RMS 28.92 2 4 6 8 1 12 14 16 18 2 2 15 1 5-5 -1-15 -2-2 -15-1 -5 5 1 15 2 position h11 24 Entries 232 Mean x -18.9622 Mean y -3.784 RMS x 78.92 RMS y 78.87 18 16 14 12 1 8 6 4 2 2 15 1 5-5 -1-15 position h22 Entries 93788 Mean x -18.49 Mean y -2.1227 RMS x 78.68 RMS y 8.9 6-2 -2-15 -1-5 5 1 15 2 5 4 3 2 1

energy spectrum 55 5 45 4 35 3 25 2 hist1 Entries 897 Mean 59.71 RMS 14.33! 2 / ndf 63.43 / 34 p 45 ± 53. p1 56.61 ±.2 p3 94.35 ± 2.46 p4 3.55 ±.358 4 5 6 7 8 Energy [kev] energy spectrum 14 12 1 8 6 4 hist1 Entries 898 Mean 297.2 RMS 6.374! 2 / ndf 7.44 / 24 p 122.5 ± 11.1 p1 296.5 ±. p3 112.6 ± 93.1 p4 -.256 ±.3126 286 288 29 292 294 296 298 3 32 34 36 38 Energy [kev] energy spectrum 26 24 22 2 18 16 14 12 1 hist1 Entries 897 Mean 76.41 RMS 3.973! 2 / ndf 141 / 32 p 166.1 ± 12.9 p1 74.61 ±.4 p3 17.6 ± 11.9 p4 75.46 ±.4 p6 221.8 ± 43.7 p7-1.471 ±.582 8 7 72 74 76 78 8 82 Energy [kev]

5 4 hist_all Entries 785 Mean 192.5 RMS 159 3 2 1 1 2 3 4 5 6 7 8

By=+.4T 2 y[mm] 15 By=T 2 y[mm] 15 By=-.4T 2 y[mm] 15 1 1 1 5-5 5-5 5-5 -1-1 -1-15 -15-15 -2-2 -15-1 -5 5 1 15 2 x[mm] -2-2 -15-1 -5 5 1 15 2 x[mm] -2-2 -15-1 -5 5 1 15 2 x[mm] By=+.4T y[mm] 2 15 1 24 22 2 18 By=T y[mm] 2 15 1 25 2 By=-.4T y[mm] 2 15 1 18 16 14 5-5 16 14 12 1 8 5-5 15 1 5-5 12 1 8 6-1 -15 6 4 2-1 -15 5-1 -15 4 2-2 -2-15 -1-5 5 1 15 2 x[mm] -2-2 -15-1 -5 5 1 15 2 x[mm] -2-2 -15-1 -5 5 1 15 2 x[mm]

energy spectrum 26 24 22 2 18 16 14 12 1 8 hist1 Entries 897 Mean 76.41 RMS 3.973! 2 / ndf 141 / 32 p 166.1 ± 12.9 p1 74.61 ±.4 p3 17.6 ± 11.9 p4 75.46 ±.4 p6 221.8 ± 43.7 p7-1.471 ±.582 7 72 74 76 78 8 82 Energy [kev] muon momentum 8 7 6 5 4 3 2 1 hist_all Entries 5886 Mean 96.14 RMS 34.9 2 4 6 8 1 12 14 16 18 2 22 Momentum [MeV/c]

Number of pions in beam [/sec] 2 18 16 14 12 1 8 6 4 2 5 1 15 2 25 3 35 4 45 5 Beam current [pa] 2 1.8 1.6 1.4 1.2 1.8.6.4.2.5.1.15.2.25

1 hist Entries 478165 Mean 223.3 RMS 176.2 8 6 4 2 1 2 3 4 5 6 7 8 Energy [kev] 2 19 18 17 16 15 14 13 hist Entries 478165 Mean 31.3 RMS 8.972! 2 / ndf 164.2 / 45 p 345.5 ± 31.9 p1 298.9 ±.1 p2.657 ±.663 p3 3194 ± 31.2 p4-5.179 ± 1.2 29 295 3 35 31 315

24 22 2 18 16 14 12 xpos_pb h_xpb1 Entries 1182 Mean -2.6 RMS 68.54 2 18 16 14 12 1 ypos_pb h_ypb1 Entries 1182 Mean -.4671 RMS 29.21 1 8 8 6 4 6 4 2 2-3 -25-2 -15-1 -5 5 1 15 2 X position [mm] -1-5 5 1 Y position [mm]

1 8 6 4 2 mom {pid==-13} htemp Entries 22442 Mean 52.2 RMS 24.5 2 4 6 8 1 12 14 16 18 2 22 mom

Ω Ω Ω (#&"!"#"$%&'()"*+,- ("%## ("$## (#%" (#$" ("!#'"!#&"!#%" ("!##!"'##!"&##!"%## +,-./1,# 234,3-56.# +/7356.#!#$"!"$##!"!" )!" (!!" ()!" $!!" $)!" *!!" *)!" %!!" %)!"!"!##!# (!!# $!!# )!!# %!!# *!!# Ω

24 22 2 18 16 14 12 1 8 6 4 xpos_pb h_xpb1 Entries 1182 Mean -2.6 RMS 68.54 2 18 16 14 12 1 8 6 4 ypos_pb h_ypb1 Entries 1182 Mean -.4671 RMS 29.21 2 2-3 -25-2 -15-1 -5 5 1 15 2 x [mm] -1-5 5 1 y [mm]

energy spectrum 7 6 5 4 3 2 hist1 Entries 816 Mean 78.69 RMS 14.66 1 5 6 7 8 9 1 11 Energy [kev] energy spectrum 45 4 35 3 25 2 15 1 hist2 Entries 898 Mean 78.7 RMS 16.66 5 5 6 7 8 9 1 11 Energy [kev]

8 7 6 5 4 3 2 1 hist_all Entries 9377 Mean 64.28 RMS 28.3 2 4 6 8 1 12 14 16 18 2 Number of muons in beam [/sec] 2 18 16 14 12 1 8 hist Entries Mean x Mean y RMS x RMS y 6 4 2 5 1 15 2 25 3 35 4 45 5 Beam current [pa]

Number of pions in beam [/sec] 2 18 16 14 12 1 8 6 4 2 5 1 15 2 25 3 35 4 45 5 Beam current [pa]