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

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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

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SLIDE 1

Precision Spectroscopy of Pionic Atom at RIKEN-RIBF Satoshi ITOH University of Tokyo

HADRON2011, 14 June 2011, Munich, Germany

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 2

Normal Nuclear Density

  • T

|<qq>| –

In-medium Tomozawa-Weinberg ¯ qqρ ¯ qq0 ≃ Z1/2

π

(ρ) b1 b1(ρ) 1/2 In-medium Glashow-Weinberg b1 b1(ρ) ≃ f t

π(ρ)

fπ 2 ¯ qqρ ¯ qq0 ≃ Z1/2

π

(ρ) f t

π(ρ)

fπ

  • fπ : pion decay constant

Zπ : pion wave-function renormalization b1 : isovector πN scattering length

  • D. Jido et al., PLB670(2008)

E.E. Kolomeitsev et al., PRL90(2003)

In-medium change of <qq>

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE:

  • 0.090
  • 0.100
  • 0.110
  • 0.120
  • 0.130
  • 0.140

b1

average

123Sn 119Sn 115Sn 205Pb

VACUUM NUCLEAR MEDIUM

3

3He Kinetic Energy [MeV]

10 20 30

1 2 3 4 5

B [MeV]

124Sn(d,3He)

p(d,3He) 0 (1s)123Sn 360 365 370 d2/ddE [b/sr/MeV]

@GSI

  • K. Suzuki et al., PRL92(2004)

Pion-nucleus optical potential (s-wave) Vopt ∝ b0(ρn + ρp) + b1(ρn − ρp)

isoscalar isovector

Deeply bound state of pionic atom

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 4

piAF project at RIKEN-RIBF

* * In114

1+ 71.9 s EC,!-

* Cd115

1/2+ 53.46 h !-

* * Sb115

5/2+ 32.1 m EC

In116

1+ 14.10 s EC,!-

* Sb116

3+ 15.8 m EC

* Te116

0+ 2.49 h EC

Cd117

1/2+ 2.49 h !-

* In117

9/2+ 43.2 m !-

* * Sb117

5/2+ 2.80 h EC

Te117

1/2+ 62 m EC

* I117

(5/2)+ 2.22 m EC

Cd118

0+ 50.3 m !-

In118

1+ 5.0 s !-

* Sb118

1+ 3.6 m EC

* Te118

0+ 6.00 d EC

I118

2- 13.7 m EC

* Cd119

3/2+ 2.69 m !-

* In119

9/2+ 2.4 m !-

* * Sb119

5/2+ 38.19 h EC

* Te119

1/2+ 16.03 h EC

* I119

5/2+ 19.1 m EC

Cd120

0+ 50.80 s !-

In120

1+ 3.08 s !-

* Sb120

1+ 15.89 m EC

* I120

2- 81.0 m EC

* Cd121

(3/2+) 13.5 s !-

* In121

9/2+ 23.1 s !-

* Sn121

3/2+ 27.06 h !-

* Te121

1/2+ 16.78 d EC

* I121

5/2+ 2.12 h EC

Cd122

0+ 5.24 s !-

In122

1+ 1.5 s !-

* Sb122

2- 2.7238 d EC,!-

* I122

1+ 3.63 m EC

* In123

9/2+ 5.98 s !-

* Sn123

11/2- 129.2 d !-

* * I123

5/2+ 13.27 h EC

Sb124

3- 60.20 d !-

* I124

2- 4.1760 d EC

Sb125

7/2+ 2.7582 y !-

* I125

5/2+ 59.408 d EC

I126

2- 13.11 d EC,!-

Cd112

0+ 24.13

Cd113

1/2+ 9.3E+15 y !-

12.22

In113

9/2+ 4.3

Cd114

0+ 28.73

Sn114

0+ 0.65

In115

9/2+ 4.41E+14 y !-

95.7

Sn115

1/2+ 0.34

Cd116

0+ 7.49

Sn116

0+ 14.53

Sn117

1/2+ 7.68

Sn118

0+ 24.23

Sn119

1/2+ 8.59

Sn120

0+ 32.59

Te120

0+ 0.096

Sb121

5/2+ 57.36

Sn122

0+ 4.63

Te122

0+ 2.603

Sb123

7/2+ 42.64

Te123

1/2+ 1E+13 y EC 0.908

Sn124

0+ 5.79

Te124

0+ 4.816

Te125

1/2+ 7.139

Te126

0+ 18.95

I127

5/2+ 100

piAF: pionic atom factory

We performed the first pilot experiment of the piAF project at RIKEN-RIBF in October 2010.

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 5

GSI RIKEN Intensity 1011/s 1012/s Target 20 mg/cm2 10 mg/cm2 Δpd/pd 0.03% 0.1% Resolution 400 keV 200 keV

d

3He 122Sn

n

121Sn

Using the (d,3He) reaction near the recoilless condition Td = 500 MeV, 122Sn target

Precision spectroscopy of pionic atom

RIKEN RIBF SRC BigRIPS Target (d,3He) reaction

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 6

Spectrometer Beam line to Target

  x θ δ   =   s11 s12 s16 s21 s22 s26 1     b11 b12 b16 b21 b22 b26 1     x0 θ0 δ0   b16s11 + b26s12 + s16 = 0 x = (b11s11 + b21s12)x0 + (b12s11 + b22s12)θ0 + (b16s11 + b26s12 + s16)δ0

Beam position at focal plane Dispersion matching condition

Dispersion matching

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE:

Matching condition with the target

7

Matching condition

b16s11 + b26s12 + Cs16 = 0

C : kinetic factor of the (d,3He) reaction b16 = 46 [mm/%] C = 1.3 b26 = 0.0 [mrad/%] s11 = −1.8 s12 = 0.0 [mm/mrad] s16 = 64 [mm/%]

position [mm]

  • 100
  • 50

50 100 counts/mm 200 400 600 800 1000

  • 1.0%

+1.0%

s16 measurement

s16 = 60.9 [mm/%]

position [mm]

  • 20
  • 10

0.2 0.4 0.6 0.8 intensity [a.u.] 10 20

  • 0.2%

+0.2%

b16 measurement

b16 = 43.8 [mm/%]

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 8

Experimental setup

RIKEN RIBF SRC F5 focal plane MWDC x 2 Segmented scinti. x 1 Target F7 focal plane

  • Scinti. x 1

d

3He, p, d 200 400 600 800 1000 1200 1400 1600

  • 400
  • 380
  • 360
  • 340
  • 320
  • 300
  • 280

ADC [ch] TOF [ns]

d p

3He

Particle identification

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 9

New data of 121Sn pionic atom

X [mm]

  • 100-80 -60 -40 -20

20 40 60 80 100

Counts

500 1000 1500 2000 2500 3000 3500 4000 4500

3He Kinetic Energy [MeV]

10 20 30

1 2 3 4 5

B [MeV]

124Sn(d,3He)

p(d,3He) 0 (1s)123Sn 360 365 370 d2/ddE [b/sr/MeV]

122Sn(d,3He)

(1s)π- 121Sn p(d,3He)π0 @GSI

  • K. Suzuki et al., PRL92(2004)

preliminary

before acceptance correction

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SLIDE 10

Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 10

New data of 121Sn pionic atom

X [mm]

  • 100-80 -60 -40 -20

20 40 60 80 100

Counts

100 200 300 400 500 600 700

122Sn(d,3He)

(1s)π- 121Sn p(d,3He)π0

  • 7 < A [mrad] < 7
  • 9 < B [mrad] < 9

Obtained histogram with a selection of the forward reaction is similar shape to the previous GSI experiment.

A: horizontal beam angle B: vertical beam angle

3He Kinetic Energy [MeV]

10 20 30

1 2 3 4 5

B [MeV]

124Sn(d,3He)

p(d,3He) 0 (1s)123Sn 360 365 370 d2/ddE [b/sr/MeV]

@GSI

  • K. Suzuki et al., PRL92(2004)

preliminary

before acceptance correction

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 11

Beam position vs beam angle

X [mm]

  • 100-80 -60 -40 -20

20 40 60 80 100

Counts

500 1000 1500 2000 2500 3000

X [mm]

  • 100-80 -60 -40 -20

20 40 60 80 100

B [mrad]

5 10 15 20 25 30 35 40

  • 10 < A [mrad] < 10
  • 10 < A [mrad] < 10

A: horizontal beam angle B: vertical beam angle

1s state is dominant for the forward emittion angle.

preliminary preliminary

before acceptance correction

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 12

Evaluation of dispersion matching

X [mm]

  • 100-80 -60 -40 -20

20 40 60 80 100

Counts

200 400 600 800 1000 1200 1400 1600

X [mm]

  • 100-80 -60 -40 -20

20 40 60 80 100

Counts

500 1000 1500 2000 2500 3000 3500 4000 4500

1mm-strip target Full target 100 enA, 170 min 50 enA, 890 min

Resolution of the full target is comparable with that of the strip target. However, there is room for improvement to achieve 200 keV resolution.

preliminary

before acceptance correction

preliminary

before acceptance correction

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 13

  • 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 121Sn 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.

Summary

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Satoshi ITOH, University of Tokyo HADRON2011, 14 June 2011, Munich, Germany PAGE: 14

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