Precision Spectroscopy of Pionic Atom at RIKEN-RIBF Satoshi ITOH - PowerPoint PPT Presentation

Precision Spectroscopy of Pionic Atom at RIKEN-RIBF Satoshi ITOH University of Tokyo HADRON2011, 14 June 2011, Munich, Germany

In-medium change of <qq> – D. Jido et al. , PLB670(2008) |<qq>| In-medium Glashow-Weinberg � f t � � ¯ qq � ρ π ( ρ ) ≃ Z 1 / 2 ( ρ ) � ¯ qq � 0 π f π Normal Nuclear f π : pion decay constant Density Z π : pion wave-function renormalization T E.E. Kolomeitsev et al. , PRL90(2003) � In-medium Tomozawa-Weinberg � 2 � f t π ( ρ ) b 1 b 1 ( ρ ) ≃ � b 1 � 1 / 2 f π � ¯ qq � ρ ≃ Z 1 / 2 ( ρ ) b 1 : isovector π N scattering length � ¯ qq � 0 π b 1 ( ρ ) Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 2

Deeply bound state of pionic atom Pion-nucleus optical potential ( s -wave) V opt ∝ b 0 ( ρ n + ρ p ) + b 1 ( ρ n − ρ p ) isoscalar isovector K. Suzuki et al. , PRL92(2004) @GSI NUCLEAR MEDIUM VACUUM 124 Sn( d , 3 He) 30 p ( d , 3 He) � 0 d 2 � /d � dE [ � b/sr/MeV] -0.090 -0.100 (1 s ) � � 123 Sn 119 Sn average 20 b 1 -0.110 205 Pb -0.120 10 115 Sn 123 Sn -0.130 B [MeV] 0 1 2 3 4 5 -0.140 0 360 365 370 3 He Kinetic Energy [MeV] Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 3

piAF project at RIKEN-RIBF piAF: pionic atom factory We performed the first pilot experiment of the piAF project at RIKEN-RIBF in October 2010. I117 I118 I119 I120 I121 I122 I123 I124 I125 I126 I127 2.22 m 13.7 m 19.1 m 81.0 m 2.12 h 3.63 m 13.27 h 4.1760 d 59.408 d 13.11 d (5/2)+ 2- 5/2+ 2- 5/2+ 1+ 5/2+ 2- 5/2+ 2- 5/2+ * * * EC EC EC EC EC EC EC EC EC EC, ! - 100 Te116 Te117 Te118 Te119 Te120 Te121 Te122 Te123 Te124 Te125 Te126 2.49 h 62 m 6.00 d 16.03 h 16.78 d 1E+13 y 0+ 1/2+ 0+ 1/2+ 0+ 1/2+ 0+ 1/2+ 0+ 1/2+ 0+ * * * * * EC EC EC EC EC EC 0.096 2.603 0.908 4.816 7.139 18.95 Sb115 Sb116 Sb117 Sb118 Sb119 Sb120 Sb121 Sb122 Sb123 Sb124 Sb125 32.1 m 15.8 m 2.80 h 3.6 m 38.19 h 15.89 m 2.7238 d 60.20 d 2.7582 y 5/2+ 3+ 5/2+ 1+ 5/2+ 1+ 5/2+ 2- 7/2+ 3- 7/2+ * * * * * * EC EC EC EC EC EC EC, ! - ! - ! - 57.36 42.64 Sn114 Sn115 Sn116 Sn117 Sn118 Sn119 Sn120 Sn122 Sn123 Sn124 Sn121 27.06 h 129.2 d 0+ 1/2+ 0+ 1/2+ 0+ 1/2+ 0+ 3/2+ 0+ 11/2- 0+ * * * * ! - ! - 0.65 0.34 14.53 7.68 24.23 8.59 32.59 4.63 5.79 In113 In114 In115 In116 In117 In118 In119 In120 In121 In122 In123 71.9 s 4.41E+14 y 14.10 s 43.2 m 5.0 s 2.4 m 3.08 s 23.1 s 1.5 s 5.98 s 9/2+ 1+ 9/2+ 1+ 9/2+ 1+ 9/2+ 1+ 9/2+ 1+ 9/2+ * * * * * * * * * * * ! - EC, ! - EC, ! - ! - ! - ! - ! - ! - ! - ! - 4.3 95.7 Cd112 Cd113 Cd114 Cd115 Cd116 Cd117 Cd118 Cd119 Cd120 Cd121 Cd122 9.3E+15 y 53.46 h 2.49 h 50.3 m 2.69 m 50.80 s 13.5 s 5.24 s 0+ 1/2+ 0+ 1/2+ 0+ 1/2+ 0+ 3/2+ 0+ (3/2+) 0+ * * * * * ! - ! - ! - ! - ! - ! - ! - ! - 24.13 28.73 7.49 12.22 Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 4

Precision spectroscopy of pionic atom ( d , 3 He) reaction d 3 He Using the ( d , 3 He) reaction near the recoilless condition n � - T d = 500 MeV, 122 Sn target 122 Sn 121 Sn RIKEN RIBF SRC GSI RIKEN Intensity 10 11 /s 10 12 /s 20 mg/cm 2 10 mg/cm 2 Target Δ p d /p d 0.03% 0.1% BigRIPS Resolution 400 keV 200 keV Target Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 5

Dispersion matching Spectrometer Beam line to Target         x s 11 s 12 s 16 b 11 b 12 b 16 x 0  = θ s 21 s 22 s 26 b 21 b 22 b 26 θ 0        δ δ 0 0 0 1 0 0 1 Beam position at focal plane x = ( b 11 s 11 + b 21 s 12 ) x 0 + ( b 12 s 11 + b 22 s 12 ) θ 0 + ( b 16 s 11 + b 26 s 12 + s 16 ) δ 0 Dispersion matching condition b 16 s 11 + b 26 s 12 + s 16 = 0 Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 6

Matching condition Matching condition with the target b 16 s 11 + b 26 s 12 + Cs 16 = 0 C = 1 . 3 s 11 = − 1 . 8 b 16 = 46 [mm/%] s 12 = 0 . 0 [mm/mrad] C : kinetic factor of the ( d , 3 He) reaction b 26 = 0 . 0 [mrad/%] s 16 = 64 [mm/%] b 16 measurement s 16 measurement -0.2% +0.2% -1.0% +1.0% intensity [a.u.] 0.8 counts/mm 1000 800 0.6 600 0.4 400 0.2 200 0 0 10 20 -20 -10 0 -100 -50 0 50 100 position [mm] position [mm] b 16 = 43 . 8 [mm/%] s 16 = 60 . 9 [mm/%] Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 7

Experimental setup RIKEN RIBF Particle identification F7 focal plane Scinti. x 1 SRC -280 TOF [ns] -300 p 3 He -320 3 He, p , d d F5 focal plane -340 MWDC x 2 Segmented scinti. x 1 Target -360 d -380 -400 0 200 400 600 800 1000 1200 1400 1600 ADC [ch] Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 8

New data of 121 Sn pionic atom 4500 Counts 122 Sn( d , 3 He) 4000 K. Suzuki et al. , PRL92(2004) (1 s ) π - 121 Sn preliminary @GSI 3500 124 Sn( d , 3 He) 30 p ( d , 3 He) � 0 d 2 � /d � dE [ � b/sr/MeV] 3000 before acceptance correction 2500 (1 s ) � � 123 Sn 20 2000 p ( d , 3 He) π 0 1500 10 1000 B [MeV] 500 0 1 2 3 4 5 0 360 365 370 0 -100-80 -60 -40 -20 0 20 40 60 80 100 3 He Kinetic Energy [MeV] X [mm] Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 9

New data of 121 Sn pionic atom -7 < A [mrad] < 7 A: horizontal beam angle -9 < B [mrad] < 9 B: vertical beam angle 700 Counts (1 s ) π - 121 Sn 122 Sn( d , 3 He) K. Suzuki et al. , PRL92(2004) 600 preliminary @GSI 124 Sn( d , 3 He) 30 500 p ( d , 3 He) � 0 d 2 � /d � dE [ � b/sr/MeV] before acceptance correction 400 (1 s ) � � 123 Sn 20 300 p ( d , 3 He) π 0 200 10 B [MeV] 100 0 1 2 3 4 5 0 360 365 370 0 -100-80 -60 -40 -20 0 20 40 60 80 100 3 He Kinetic Energy [MeV] X [mm] Obtained histogram with a selection of the forward reaction is similar shape to the previous GSI experiment. Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 10

Beam position vs beam angle A: horizontal beam angle B: vertical beam angle 40 B [mrad] Counts -10 < A [mrad] < 10 -10 < A [mrad] < 10 3000 35 preliminary preliminary 2500 30 25 before acceptance correction 2000 20 1500 15 1000 10 500 5 0 0 -100-80 -60 -40 -20 0 20 40 60 80 100 -100-80 -60 -40 -20 0 20 40 60 80 100 X [mm] X [mm] 1s state is dominant for the forward emittion angle. Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 11

Evaluation of dispersion matching 1mm-strip target Full target 4500 1600 Counts Counts 50 enA, 890 min 100 enA, 170 min 4000 1400 preliminary preliminary 3500 1200 3000 before acceptance correction 1000 before acceptance correction 2500 800 2000 600 1500 400 1000 200 500 0 0 -100-80 -60 -40 -20 0 20 40 60 80 100 -100-80 -60 -40 -20 0 20 40 60 80 100 X [mm] X [mm] Resolution of the full target is comparable with that of the strip target. However, there is room for improvement to achieve 200 keV resolution. Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 12

Summary 1. We performed the precision spectroscopy experiment of the pionic atom at RIKEN-RIBF in October 2010. 2. The dispersion matching was realized. However, there is room for improvement. 3. We observed the deeply bound 1s state (and others) of the 121 Sn pionic atom. 4. Future plans • To deduce the binding energy and the width of the deeply bound state. • Improvement of the dispersion matching for the next experiment. Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 13

piAF collaboration (October 2010) S. Itoh, G.P.A. Berg, H. Geissel, R.S. Hayano, N. Inabe, K. Itahashi, D. Kameda, T. Kubo, H. Matsubara, S. Michimasa, K. Miki, H. Miya, M. Nakamura, T. Nishi, S. Noji, S. Ota, K. Suzuki, H. Takeda, K. Todoroki, K. Tsukada, T. Uesaka, H. Weick, and K. Yoshida Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 14