Experimental Opportunity at J-PARC H.M.Shimizu Department of - - PowerPoint PPT Presentation

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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Experimental Opportunity at J-PARC

H.M.Shimizu

Department of Physics, Nagoya University hirohiko.shimizu@nagoya-u.jp

ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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H.M.Shimizu, M.Kitaguchi, K.Hirota, G.Ichikawa T.Ino K.Sakai, H.Hideo, A.Kimura T.Yoshioka T.Shima Y.Yamagata M.Hino

T.Sugino, R.Sakakibara, S.Itoh, S.Hisamura S.Awano, F.Goto, K.Nagamoto, M.Yokohashi, N.Oi, A.Okada

Nagoya Univ. JAEA KEK RCNP, Osaka Univ. Kyushu Univ. RIKEN RRI, Kyoto Univ.

• Univ. British Columbia

Tokyo Institute of Technology Y.Yamagata K.Asahi

• T. Iwata

Yamagata Univ. V.Gudkov

• Univ. South Carolina

W.M.Snow Indiana Univ.

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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Origin of CP-violation

Quarks Leptons Nucleons Nuclei Atoms Molecules

Nucleon EDM P,T-odd Couplings

Energy Frontier Planck scale

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Enhanced Sensitivity to P-violation in Nuclear Process

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

eV neutron capture

Potential Scattering Compound Resonance I s = 1/2 l = 0, 1, (2,...) j = l + s J = I + j

neutron total angular momentum target spin spin of the resonance

l = 0 s-wave resonance l = 1 p-wave resonance j = 1/2 or 3/2 s p1/2 p3/2 I = 0 J = 1/2 J = 1/2 J = 3/2

1/kR ~ 10−3

interference

(common J)

{

U σn,tot

V.McLane et al. Neutron Cross Sections vol.2 5

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

Enhancement of P-violation in a Compound State

En Es Ep

s-wave resonance

p-wave resonance P-violation is enhanced in Δσ ΔσP 4π k2 Im (Γ ns)1/2 v (Γ np)1/2 (E − Es + iΓs / 2) (E − Ep + iΓp / 2) = v = s p W n A (A+1)*

i

Σ

i

ai ( )

Σ

i=1

ai ψi

N

s =

Σ

j=1

bj ψj

N'

= p ΔE D

10 6eV 10 eV

N ~ ~ 10 5 s p W Ep − Es ~ W N √ ΔE 10 10 −7 10 10 2 − 10 10 3

Σ

i, j

ai*

N

ψi = bj ψj s p W W ~ W N √ N √ 1 N √ 1

PV in NN interaction

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interference between neighboring s- and p-wave resonances

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

Parity Mixing (Entrance Channel)

Dynamic Enhancement Structural Enhancement

Kinematical Enhancement

En− Es + i 2 Γs

~

W 2

~

n A A'

γ W

s p

n A A'

γ

p 2 2 W Γp

γ

1 En− Ep + i 2 Γp Γsn 1 En− Es + i 2 Γs Γp

γ

1 En− Ep + i 2 Γp Γpn Γpn Γsn

Γpn Γsn 2W | Ep - Es |

En = Ep

102 ~ 103 ~103

α = 2Re fPCfPNC* |fPC|2 ~ 2 |fPNC| |fPC| f = fPC + fPNC |f|2 = |fPC|2 + 2Re fPCfPNC* + |fPNC|2 ⇒

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page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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Experimental Apparatus

biological shield p 500MeV spallation moderation

H2O

superconducting magnet 2.5T beam monitor γ

Spallation Neutron Source Dynamically Polarized Proton Filter as Neutron Polarizer γ-ray Detectors Neutron Detector

BaF2 10B loaded liquid scintillator

Adiabatic Passage Transmittance Monitor

Adiabatic Passage Adiabatic Passages Superconducting Magnetic Shield

Target Rotatable

Polarized Neutron Source Target station Neutron Spin Analyzer

Experimental Appratus polarizer polarized target analyzer spin control

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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Principle used in this estimation

∆σCP = κ(J)w v ∆σP

Gudkov, Phys. Rep. 212 (1992) 77 T-violation P-violation gCP/gP

present dn upper limit corresponds to 10-3

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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T-violation in Neutron Optics

f = A0 + B0σ · ˆ I + C0σ · ˆ k + D0σ · (ˆ I × ˆ k)

Ui k Uf I z

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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T-violation in Neutron Optics

f = A0 + B0σ · ˆ I + C0σ · ˆ k + D0σ · (ˆ I × ˆ k)

Ui k Uf I z

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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x y z

Prob( )

x y z

Prob( )

4 Im C*D

x y z

Prob( )

x y z

Prob( )

4 Im A*D

x y z

Prob( )

x y z

Prob( )

4 Im B*D Polarization Transfer

x y z x y z

− 8 Im C*D

x y z x y z

8 Im B*D

x y z x y z

8 Re A*D A(Analyzing Power) & P(Polarization)

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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x y z

Prob( )

x y z

Prob( )

4 Im C*D

x y z

Prob( )

x y z

Prob( )

4 Im A*D

x y z

Prob( )

x y z

Prob( )

4 Im B*D Polarization Transfer

x y z x y z

− 8 Im C*D

x y z x y z

8 Im B*D

x y z x y z

8 Re A*D A(Analyzing Power) & P(Polarization)

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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Choice of Target Nucleus

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En [eV] |AL| [%]

139La 81Br 232Th 108Pd 232Th 113Cd 108Pd 232Th 238U 131Xe 107Ag 232Th 238U 232Th 121Sb 113Cd 232Th 127I 115In 113Cd 117Sn 109Ag 115In 133Cs

Mitchell, Phys. Rep. 354 (2001) 157

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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En [eV] |AL| [%]

139La 81Br 232Th 108Pd 232Th 113Cd 108Pd 232Th 238U 131Xe 107Ag 232Th 238U 232Th 121Sb 113Cd 232Th 127I 115In 113Cd 117Sn 109Ag 115In 133Cs

Mitchell, Phys. Rep. 354 (2001) 157

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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139La 81Br 117Sn

ΔσP Ep [eV] ◎ ◎ ⚪ epithermal ~eV

131Xe

◎

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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Polarized Epithermal Neutron Beam

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Spallation Source at J-PARC

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Spallation Source at J-PARC

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Spallation Source at J-PARC

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Spallation Source at J-PARCBL07 ← Poisoned Moderator

BL13 ← Coupled Moderator

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BL07 Beam Intensity

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Pulse Shape

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Pulse Shape

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139La 81Br 117Sn

ΔσP Ep [eV] ◎ ◎ ⚪ ◎ ◎ ⚪

131Xe

◎ ⚪

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

139La 81Br 117Sn

ΔσP Ep [eV] I ◎ isotopic abn ◎ ⚪ ◎ ◎ ⚪ 7/2 △ 3/2 ⚪ 3/2 ⚪

131Xe

◎ ⚪ 1/2 ◎ ◎ ⚪ × △

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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139La 81Br 117Sn

ΔσP Ep [eV] κ(J) I ◎ isotopic abn ◎ ⚪ ◎ ◎ ⚪ 7/2 △ 3/2 ⚪ 3/2 ⚪

131Xe

◎ ⚪ 1/2 ◎ ◎ ⚪ × △

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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139La 81Br 117Sn

ΔσP Ep [eV] κ(J) I ◎ isotopic abn ◎ ⚪ ◎ ◎ ⚪ 7/2 △ 3/2 ⚪ 3/2 ⚪

131Xe

◎ ⚪ 1/2 ◎ ◎ ⚪ × △

∆σCP = κ(J)w v ∆σP

T-violation P-violation gCP/gP

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

∆σCP = κ(J)w v ∆σP

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Gudkov, Phys. Rep. 212 (1992) 77 T-violation P-violation gCP/gP

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

∆σCP = κ(J)w v ∆σP

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Gudkov, Phys. Rep. 212 (1992) 77

κ(J = I + 1 2) = 3 2 √ 2 2I + 1 2I + 3

• √

2I + 1(2 √ Ix − √ 2I + 3y) (2I − 3) √ 2I + 3x − (2I + 9) √ Iy

κ(J = I − 1 2) = − 3 2 √ 2

• (2I + 1)

√ I

• (I + 1)(2I − 1)
• 2

√ I + 1x + √ 2I − 1y (I + 3) √ 2I − 1x + (4I − 3) √ I + 1y

x2 = Γn

p,1/2

Γn

p

y2 = Γn

p,3/2

Γn

p

T-violation P-violation gCP/gP

x2 + y2 = 1 x = cos φ y = sin φ

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I=1/2, J=1 (117Sn) I=3/2, J=1 (131Xe) I=3/2, J=2 (81Br) I=7/2, J=4 (139La)

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I=1/2, J=1 (117Sn) I=3/2, J=1 (131Xe) I=3/2, J=2 (81Br) I=7/2, J=4 (139La)

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I=1/2, J=1 (117Sn) I=3/2, J=1 (131Xe) I=3/2, J=2 (81Br) I=7/2, J=4 (139La) 0.23 1.01 0.33 0.36 is generally advantageous. The case of

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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dσ dΩ = 1 2

• a0 + a1kn · kγ + a3
• (kn · kγ)2 − 1

3

• a0 =
• Js

|V1(Js)|2 +

• Js,j

|V2(Jpj)|2 a1 = 2Re

• Js,Jp,j

V1(Js)V ∗

2 (Jpj)P(JsJp

1 2j1IF)

a3 = Re

• Js,j,J

p,j

V2(Jpj)V

2 (J pj)P(JpJ pjj2IF)3

√ 10

• 2

1 1

1 2 1 2

2 j j

• V1 =

1 2ks

• Es

E

• gΓn

s Γγ

E − Es + iΓs/2

V2(j) = 1 2kp

• Ep

E

• Γn

pj

Γn

p

gΓn

pΓγ

E − Ep + iΓp/2

P(JJjjkIF) = (−1)J+J+j+I+F 3 2

• (2J + 1)(2J + 1)(2j + 1)(2j + 1)

j j j I J J k 1 1 F J J

• Flambaum, Nucl. Phys. A435 (1985) 352

V2(j=1/2)=xV2 = V2cosφ V2(j=3/2)=yV2= V2sinφ

（n,γ）Cross Section （un-polarized case）

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neutron energy [eV]

139La(n,γ) P-wave resonance 0.73 eV

a0, a1and a3 Calcuration

x：j＝1/2 x=cosφ y：j＝3/2 y=sinφ

a0 a0 a1x a1y a3yy a3xy

neutron energy [eV]

The Coefficients a1x and a1y change their sign at resonance energy. We determine the φ by comparing the experimental and theoretical values of .

YL YH

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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J-PARC MLF BL04 ANNRI

Ge Spectrometer（Flight Length: 21.5m）

14 Ge（+BGO）Detectors

θ＝70,90,110 deg.

Cluster-Detector sysyem

Intensity : ~ 3 x 105 n/cm2/s : 0.9 eV < En < 1.1eV @300kW

Sample Materials：natLa, LanatBr3, natIn

Neutron Source Neutron Source

We got σ(Eγ, En,, θ) of (n,γ) reaction.

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

4500 4600 4700 4800 4900 5000 5100 5200 5300 5400 5500 200 400 600 800 1000 1200

Gamma energy Gamma energy

50 100 150 200 250 300

10 × 5000 10000 15000 20000 25000 30000

Neutron TOF Neutron TOF 38

Counts Counts

139La(n,γ)

5161keV (gnd. 3-) 5098keV (Ex 63keV 4-)

neutron TOF ：10 nsec unit

139La(n,γ) 0.73 eV

(1.8 msec)

138La(n,γ) 2.99 eV

En [eV]

139La(n,γ) 0.73 eV

P-wave resonance

5126keV (5-)+5131keV (2-) 4842keV(Ex 318keV 3-)

gamma energy [keV]

4694keV(Ex 467keV 1-) 4580keV(Ex 581keV 0-) 4730keV (58Fe) 4903keV (27Al)

E[eV] lm gΓn [meV]

• 48.6

80 √ E 0.734±0.1 1 (3.75±0.18)x10-5 72.2±0.1 16.6±0.5

Neutron Energy spectrum σ(En)

Integrate the neutron energy Integrate the gamma energy

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Preliminary

Integral 0.7 eV < En < 0.8eV

5161keV (gnd. 3-)

Fit by Breit-Wigner function

0.75eV

E[eV] lm gΓn [meV]

• 48.6

80 √ E 0.734±0.1 1 (3.75±0.18)x10-5 72.2±0.1 16.6±0.5 beam intensity correction

En

Check of the resonance energy

En [eV]

Counts Counts

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5161keV (gnd. 3-)

θ = 70 deg. θ = 90 deg θ = 110 deg

YL YH

φ [deg]

Cal. Exp.

ungate (Scale: ×0.0007)

Preliminary

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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φ [deg]

139La(n,γ)140Lagnd

I = 7/2 , J=4

Preliminary

Only 139La(n,γ)140Lagnd. Other transitions are being analyzed.

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Very small cosφ implies very large W value,,, P-violating matrix element

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139La 81Br 117Sn

ΔσP Ep [eV] κ(J) I ◎ isotopic abn ◎ ⚪ ◎ ◎ ⚪ 7/2 △ 3/2 ⚪ 3/2 ⚪

131Xe

◎ ⚪ 1/2 ◎ ◎ ⚪ × △ ⚪ △ △ △

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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139La 81Br 117Sn

ΔσP Ep [eV] κ(J) I ◎ isotopic abn ◎ ⚪ ◎ ◎ ⚪ 7/2 △ 3/2 ⚪ 3/2 ⚪

131Xe

◎ ⚪ 1/2 ◎ ◎ ⚪ × △ ⚪ △ △ △ method of pol. DNP OP ー ー

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139La 81 117

ΔσP Ep [eV] κ(J) I ◎ isotopic abn ◎ ⚪ ◎ ◎ ⚪ 7/2 △ 3/2 3/2 ⚪

131Xe

◎ ⚪ 1/2 ◎ ⚪ × △ ⚪ △ △ △ method of pol. DNP OP ー ー

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

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139La 81 117

ΔσP Ep [eV] κ(J) I ◎ isotopic abn ◎ ⚪ ◎ ◎ ⚪ 7/2 △ 3/2 3/2 ⚪

131Xe

◎ ⚪ 1/2 ◎ ⚪ × △ ⚪ △ △ △ method of pol. DNP OP ー ー practical abn practical abn LaAlO3 solid Xe ⚪ ⚪

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139La 81 117

ΔσP Ep [eV] κ(J) I ◎ isotopic abn ◎ ⚪ ◎ ◎ ⚪ 7/2 △ 3/2 3/2 ⚪

131Xe

◎ ⚪ 1/2 ◎ ⚪ × △ ⚪ △ △ △ method of pol. DNP OP ー ー practical abn practical abn LaAlO3 solid Xe ⚪ ⚪

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J-PARC/MLF – JSNS BL07 15m

3He (100 atm cm)

Pn=0.7 Tn=0.4

natXe (9000 atm cm)

PXe=0.25 8Re A*D=1.0x10-6 4cmx4cm(x20cm) Bps=0.019T Ω=4.4x10-5sr Γ=0.1eV dNn/dt=7.6x106n/s

solid Xe with natural abundance as an example

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J-PARC/MLF – JSNS BL07 15m

3He (100 atm cm)

Pn=0.7 Tn=0.4

natXe (9000 atm cm)

PXe=0.25 8Re A*D=1.0x10-6 4cmx4cm(x20cm) Bps=0.019T Ω=4.4x10-5sr Γ=0.1eV dNn/dt=7.6x106n/s

solid Xe with natural abundance as an example

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J-PARC/MLF – JSNS BL07 15m

3He (100 atm cm)

Pn=0.7 Tn=0.4

natXe (9000 atm cm)

PXe=0.25 8Re A*D=1.0x10-6 4cmx4cm(x20cm) Bps=0.019T Ω=4.4x10-5sr Γ=0.1eV dNn/dt=7.6x106n/s

solid Xe with natural abundance as an example

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

51

J-PARC/MLF – JSNS BL07 15m

3He (100 atm cm)

Pn=0.7 Tn=0.4

natXe (9000 atm cm)

PXe=0.25 8Re A*D=1.0x10-6 4cmx4cm(x20cm) Bps=0.019T Ω=4.4x10-5sr Γ=0.1eV dNn/dt=7.6x106n/s

feasible solid Xe with natural abundance as an example

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

52

J-PARC/MLF – JSNS BL07 solid Xe with natural abundance as an example 15m

3He (100 atm cm)

Pn=0.7 Tn=0.4

natXe (9000 atm cm)

PXe=0.25 8Re A*D=1.0x10-6 4cmx4cm(x20cm) Bps=0.019T Ω=4.4x10-5sr Γ=0.1eV dNn/dt=7.6x106n/s

Alignment, inhomogeneous polarization distribution and field control can be simultaneousely monitored observing the spin behavior as a function of time-of-flight.

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

0.001 0.01 0.1 1

• 2
• 1.5
• 1
• 0.5

0.5 1 1.5 2

| sin b / b | H [T]

53

|sinb/b| in 100% polarized LaAlO3 as a function of external field H

page Title(Experimental Opportunity at J-PARC) Conf(ACFI Meeting “Time-reversal Tests in Nuclear and Hadronic Processes”) Date(2014/11/07) At(Amherst Center for Fundamental Interactions, Univ. of Massachusetts Amherst)

54

Summary CP-violation can be studied in epithermal neutron optics with the sensitivity comparable with or better than the neutron EDM combining existing technologies at J-PARC. Domestic consolidation finished. Proposals to be submitted. Check if the κ(J) is not zero. Validity of neutron optical description should be checked by observing the spin behaviors in T-conserving terms.

If we have a sufficiently thick polarized solid Xe → more alternative possibilities are also existing (La, Br, Sn, …)