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### Tensor Analyzing Powers of pd Radiative Capture

Y. Tameshige, K. Sagaraa, T. Kudoha, M.Shiotaa,

S. Shimomotoa, T.Wakasaa,

K. Hatanaka, A. Tamii, Y. Sakemi, Y. Shimizu, H.P.Yoshidaa,

H.Kamadab, and H. Witalac

RCNP Osaka University,

aDepartment of Physics, Kyushu University

bFaculty of Engineering, Kyushu Institute of Technology

cDepartment of Physics, Yagellonian University

contents

- Introduction
- Experiment
- Results
- Summary &Future Plan

Higher-order 3NF (short range)

D

p

N

N

N

r, w,..

p

3H biding energy

Exp. 8.48 MeV

N

N

N

N

N

N

IntroductionHowever, even if 2p3NF is included, polarization observables of pd scattering can not be reproduced.

↓

Higher-order 3NF may be necessary.

NN+3NF

K. Sekiguchi et al.

Ayd

Ayy

Axx

Axz

Ed=

140MeV

Ed=

200MeV

Ed=

270MeV

indicating deficiencies in the spin-dependent

part of present 3NF models

Adding a 3NF does not improve

the description of the data.

Higher-order 3NF (short range)

r, w,..

p

N

N

N

N

N

N

However, even if 2p3NF is included, polarization observables of pd scattering can not be reproduced.

↓

Higher-order 3NF may be necessary.

pd capture reaction may be a probe of short range forces.Discrepancies in polarization observables of pd scattering are complicated.

↓

Simple and clear signatures are required to study higher-order 3NF.

g

+

+

Candidate to find out short distance three nucleon reaction

Present study: pd capture experiment

g

+

+

In pd capture reaction,

○Short-range forces may play important roles. (→short range 3NF)

×Reaction cross section is very small (~ 0.1 m barn).

- Experimental techniques
- thick target & low BG → liquid hydrogen target
- high-efficiency detection → one-shot measurement of whole
- angular distribution

p+d →3He+γ experiment at Ed = 137 MeV

Ed= 137 MeV(4nA)

Axx (pure tensor)

Ayy (pure tensor)

(Pyy = -1.2)

1.5mm(10mg/cm2)

q(3He) < 4.1

Vertical plane

for Axx

Horizontal plane

for Ayy

Slit in front of LAS

Axx

d-beam is

vertically

polarized

5°

4°

3°

2°

4°

5°

3°

2°

Φ20

Ayy

Axx

LAS at 2.5°

LAS at 0°

FC shadow

Angular distribution in 20~160 was taken in one shot.

LAS acceptance

horizontally ±3.4 [deg] ( ±60 [mrad])

vertically ±5.7 [deg] (±100 [mrad])

Liquid Hydrogen Target

θcm=170°

θcm=180°

θcm=20°

X vs Y

X vs θ

Data analysisAyy (2.5°)

Axx (0°)

Raw data from

liquid H2 target

(normal target)

Backgrounds

from windows

(empty target)

(normal target)

Aramid foil target

(empty target)

Data analysis of Axxprojection

θcm=0°

θcm=180°

projection

Y [mm]

180°

0°

X [mm]

(normal target)

Aramid foil target

(empty target)

Data analysis of Ayyprojection

θcm=170°

θcm=20°

The same beam charge is

the same background tail.

AV18

AV18+URBIX

●

- - -

―

Result at137MeVCalc. by

Kamada et al.

Axx

Ayy

Measured Axx largely disagrees with calculations, and

2p3NF can not explain the difference

x

beam

Axx

Azz

Ayy

・ Axx ~ Ayymeans the reaction is z-axial symmetry.

・ Axx ~ Ayy <0 and Azz>0 means the reaction is

dominant in the central region.

KVI data

AV18

AV18+URBIX

●（●）

●

- - -

―

(PRB617,2005,18) at 133MeV

RCNP(137MeV) and at 133 MeV (KVI)Axx

Ayy

・The disagreement also exist at 196MeV(RCNP) and 188MeV(KVI) data.

・We plan to measurements Azz at 196MeV to check the consistency our data.

Energy dependence of Axx (90) and Ayy (90)

Only Ayy measured

KVI

Ayy & Axx

measured

Aｘｘ

Aｙｙ

Present data

RCNP

Aｙｙ

Axx

・Present data confirmed the Axx~Ayyrelation and the large discrepancy in Axx.

・Present data at 137MeV and 196MeV data show smooth energy dependence.

Summary

・ Axxand Ayy of pd-capture reaction at Ed=137,196 MeV

were measured.

・ Measured Axx largely disagrees with calculations, and

2p3NF can not explain the difference.

・ Data shows Axx～Ayy whereas Axx≠Ayy in calculation.

The relation Axx ~ Ayy may be a possible signature of

short-range force (3NF).

・ RCNP data and KVI data disagree in the absolute values.

A new experiment on Azzat 196 MeV

will be made in October2006 (5days later).

Axx at RCNP(137MeV) and at 133 MeV (KVI)

Present data at 137MeV

KVI data

AV18

AV18+URBIX

●

●

- - -

―

(PRB617,2005,18) at 133MeV

Ayy at RCNP(137MeV) and at 133 MeV (KVI)

present data

KVI data

AV18

AV18+URBIX

●

●

- - -

―

(PRB617,2005,18) at 133MeV

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