KEK SRC Workshop Sept 25, 2009

KEK Theory Center Workshop on Short-range Correlations and Tensor Structure

at J-PARCSeptember 25, 2009

Search for Direct Evidence of Tensor Interaction via (p,d) Reaction

Hooi Jin, ONGResearch Center for Nuclear Physics (RCNP)

Osaka University

KEK Theory Center Workshop on Short-range Correlations and Tensor Structure

at J-PARCSeptember 25, 2009

Search for Direct Evidence of Tensor Interaction via (p,d) Reaction

Hooi Jin, ONGResearch Center for Nuclear Physics (RCNP)

Osaka University

KEK SRC Workshop Sept 25, 2009

Tensor Interactions in Atomic Nuclei

Tensor interactions Fundamental nuclear interactions that provide

attractive force Caused by pion exchange

Evidences of tensor interactions Admixtures of D-wave in d, Deviation of magnetic moments (of double-

closed+1 nuclei) from the Schmidt values Varying magic numbers in neutron-rich nuclei

KEK SRC Workshop Sept 25, 2009

one of the hot topics in nuclear physics

Possible role of tensor interactions in changing the spin-orbit splitting...

Varying magic numbers in neutron-rich nuclei:

T. Otsuka et al, PRL95, 232502(2005)

KEK SRC Workshop Sept 25, 2009

But thus far the “evidences” from nuclei heavier than d and are indirect…

Is “direct” evidence on the tensor interactions possible, experimentally?

Tensor interactions: Intermediate range

Mean field

KEK SRC Workshop Sept 25, 2009

Theoretical Momentum Distribution

W. Horiuchi and Y. Suzuki, PRC76, 024311(2007)

T. Neff and H. Feldmeier, NPA713, 311(2003)

R. Schiavilla et al., PRL 98, 132501 (2007)

+N+N model

pn pair (lines)

pp pair (symbols)

KEK SRC Workshop Sept 25, 2009

How to measure high momentum components?

(e,e'p), (e,e'pp), (e,e'pn), etc.

(p,2p), etc.

KEK SRC Workshop Sept 25, 2009

(p,d): Selective measurement of high momentum components(p,d): Selective measurement of high momentum components

‡ G. W. Bennett et al.,

PRL19, 387(1967)

† K. Sekiguchi et al., PRL95, 162301(2004)

+ Measurement for quasi-free (p,pd) reaction+ Measurement for quasi-free (p,pd) reaction

Ep = 1GeV

KEK SRC Workshop Sept 25, 2009

Subjects of Study: 12C and 16O

Selection Rule: J=0, L=S=2

Measure the internal momentum, in particular, the High Momentum Component

Measure the internal momentum, in particular, the High Momentum Component

KEK SRC Workshop Sept 25, 2009

Momentum Transfer Cover momentum transfer at around 2 fm-1 (394 MeV/c) Cover momentum transfer at around 2 fm-1 (394 MeV/c)

=0° (p+12C) -> d+11C

=15° (p+12C) -> d+11C

=30° (p+12C -> d+11C)

=0° (p+12C) -> p+d+10B

KEK SRC Workshop Sept 25, 2009

Experiment Setup

Target

d

p

RCNP Grand RAIDEN

Θd

KEK SRC Workshop Sept 25, 2009

Online Data: 16O Target

States in 15O

16O (p,d) Ep = 392 MeVΘd = 10°

12C (p,d) Ep = 198 MeVΘd = 10°

12C (p,d) Ep = 392 MeVΘd = 20°

Online Data: 12C Target

KEK SRC Workshop Sept 25, 2009

Online Data: (p,pd) channel

• deuteron-proton coincidence events.

Ed [MeV]

14N ground state

Ep [MeV]

KEK SRC Workshop Sept 25, 2009

12C (p,d) Ep = 198 MeVΘd = 10°

12C (p,d) Ep = 295 MeVΘd = 10°

12C (p,d) Ep = 392 MeVΘd = 10°

11CLevel scheme 3

/2-

0.0

positive-paritystates

16O (p,d) Ep = 198 MeVΘd = 10°

16O (p,d) Ep = 295 MeVΘd = 10°

16O (p,d) Ep = 392 MeVΘd = 10°

15OLevel scheme 1

/2-

0.0

positive-paritystates

KEK SRC Workshop Sept 25, 2009

Summary

(p,d) and (p,pd) reactions on 12C and 16O targets have been measured with the Grand RAIDEN spectrometer at RCNP, Osaka Univ., using proton beam at energies 198, 295, 392 MeV.

Reaction involving high-momentum components has been observed.

KEK SRC Workshop Sept 25, 2009

Acknowledgment

RCNP I. Tanihata, A. Tamii, H. Okamura, M. Yosoi, T. Suzuki, K. Hirota, T. Naito, H. Matsubara, J. Zenihiro, Y. Yasuda, T. Adachi, Y. Tameshige, K. Suda, D. Ishikawa, H. Toki, T. Myo, Y. OgawaDep. of Phys., Osaka Univ. K. Matsuta, M. Fukuda, M. Mihara, D.NishimuraMiyazaki Univ. H. SakaguchiKyoto Univ. T. KawabataTsukuba Univ. A. OzawaRIKEN Nishina Center K. Sekiguchi, K. Ikeda

Nara Women’s

Univ. M. Taniguchi

RCNP I. Tanihata, A. Tamii, H. Okamura, M. Yosoi, T. Suzuki, K. Hirota, T. Naito, H. Matsubara, J. Zenihiro, Y. Yasuda, T. Adachi, Y. Tameshige, K. Suda, D. Ishikawa, H. Toki, T. Myo, Y. OgawaDep. of Phys., Osaka Univ. K. Matsuta, M. Fukuda, M. Mihara, D.NishimuraMiyazaki Univ. H. SakaguchiKyoto Univ. T. KawabataTsukuba Univ. A. OzawaRIKEN Nishina Center K. Sekiguchi, K. Ikeda

Nara Women’s

Univ. M. Taniguchi

RCNP-E314 collaborators:

Thank you very much for your attention!

Acknowledgment

Thank you very much for the invitation and financial support!

The organizers & KEK Theory Center