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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
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