RIKEN/Tokyo-Russia Collaborationof Polarized Deuteron Experiments
CNS, Univ. of TokyoT. Uesaka
Polarized Deuteron Beam
Polarized Deuteronunique probe to isoscalar spin excitations
missing collectivity in nuclei (V mode)
N* excitationstensor polarization observables
direct signature of tensor interactionsmallest nuclei
indispensable tool in few body physics
TECHNICALLYdifficulty in manipulating particle with
spin ONE and small magnetic moment
RARF 140 - 270 MeVSpin-isospin excitation
via (d,2He) and (d,d’) reactions3N force effects via d+p elastic scatteringshort-range structure of deuteron, 3He
Polarization axis can be freely controlledWien Filter systemsingle turn extraction
Maximum intensity> 100nA on target
Polarized Deuteron Beam at RIKEN
R i n g C y c l o t r o n
5 0 m0
B e a m P a t h
P I S
A V F C y c l o t r o n
S p e c t r o g r a p h S M A R T
P o l a r i m e t e r
Ed=880MeV at RIBF
Polarized Deuteron Beam at JINR
Nuclotron (new machine)super-conductingstrong focusEd < 12 GeV
Physics Programs with Nuclotron
• Nucleon Structure• Nuclear Structure
short-range structure of deuteron and 3He• Medium effects on particle production• Modification of nuclear matter • Hypernuclei and nuclei
With booster
cycle: 10 s
Cumulative Production and d Structure• “Cumulative Production” (A.M.Baldin, prev. director of LHE, JINR)
production of energetic particle which is impossible in nucleon-nucleon kinematics.
Deuteron induced “cumulative” proton production can be a unique probe to deuteron structure at short distances
approach to QCD predictionstrange structures in the resonance region
T.Aono et al., PRL 74 (1995) 4997.L.S. Azhgirey et al., PLB 391 (1997) 22.A.A.Nomofilov et al., PLB 325 (1994) 327.
• SubjectStructure of light nuclei at short-range, putting special focus on its spin dependences
• Brief history2000 Collaboration Agreement between RIKEN
and JINR ( ~ 2003)2000 Nov. 1st collaboration experiment
dd →n3He(p3H) measurement at RIKEN 2002 Apr. JINR proposal
3He(d,p)4He (CUPID3 project) approved2004 Mar. Collaboration Agreement between
Univ. Tokyo and JINR 2004~ development of deuteron polarimeter
RIKEN/Tokyo-Russia Collaboration
EXPERIMENT at RIKEN
Extension of cumulative production to study of 3N system
Reaction mechanism theoretical study J.M. Laget et al., Nucl. Phys. A370 (1981) 479.
before 2000, only cross section data available.polarization data, especially tensor analyzing power is necessary to probe the D-state effect in three nucleon system.
1st measurement of pol. observables at RIKEN (V.P.Ladygin)
3He Structure studied via d+d →3He+n
Results of R308n experiment
2000 November 1st experiment undercollaboration ofRIKEN/Tokyo-JINR
Lines:solid Urbanadashed Parisdots RSC
V.P. Ladygin, T. Uesaka et al., Phys. Lett. B 598 (2004) 47.
Ed=140, 200, 270 MeV
Tensor analyzing power T20
clear signature ofD-state effect in 3He
EXPERIMENT at JINR
• Spin Correlation Measurement of polarized deuteron beam and polarized 3He target
T. Uesaka et al., Phys. Lett. B 467 (1997) 199.T. Uesaka et al., Phys. Lett. B 533 (2002) 1.
CUPID3 Project at Nuclotron
2002 Apr.Approved 1000 hours (including test machine time)
~2004 no progress due to insufficient intensity ofpolarized deuteron beam (~107cps)
for the spin correlation measurement intensity of ~ 109 cps is necessary.
This is partly due to the short injection time of Nuclotron(8ms) compared with the previous Synchrophasotron.
CUPID3 Project at Nuclotron
• POLARIS (Pilipenko)long pulse duration
vector OR tensor polarization separate experiments for vector and tensor measurem
ents different polarimetry for vector and tensor polarizations
vector: d+p quasi-elastic scatteringtensor: deuteron breakup reaction
• CIPIOS @ IUCF (Derenchuk) → to Duban in this yearshort pulse operation → increase of beam intensity by two orders of magnit
udevector AND tensor polarization simultaneous measurement of vector and tensor observables
NEED new polarimetry for both vector and tensor polarizations
Polarized Ion Source at Nuclotron
• Large vector and tensor analyzing powers• Coincidence measurement of deuteron and proton
Simple detector system with plastic scintillatorsCH2 can work as a hydrogen target
Established at intermediate energies
d+p Scattering as a deuteron polarimetry
d+p Elastic Scattering at GeV energies
1.06 GeV: J.S. Vincent et al., Phys.Rev.Lett.24 (1970) 236.1.6 GeV : E. Winkelmann et al., Phys.Rev. C21 (1980) 2535.2.0 GeV : G.W. Bennett et al.,Phys.Rev.Lett.19 (1967) 387.
approximate t-scalingconsiderably large Ay, Ayy even at backward angles
Internal Target Station of Nuclotron
• 2004 June runBeam Lifetime measurement with CH2 target
= 10s for 2m-thick target
• 2004 November-December rundetector test evaluation of accidental coincidence rate@ 0.88 - 2 GeV
• 2005 February-March runmeasurement of vector and tensor analyzing powers at 7 energies (0.88, 1.0, 1.25, 1.5, 1.6, 1.75, and 2.0 GeV)
RIBF energy
Schedule
Collaborators
Yu.S.Anisimov, O.Avramova, L.S.Azhgirey, V.K.Bondarev, J.Bunta, J.Charuba,
L.Dimitrov, S.Gmuca, Z.Guzik, K.Hatanaka, M.Hatano, E.Igorova,T.Ikeda, K.Itoh,
V.I.Ivanov, M.Janek, T. Kawabata Yu.-T.Karachuk, T.L.Karavicheva, E.V.Karpechev,
J.Kliman, V.A.Krasnov, A.N.Khrenov, A.D.Kirillov, B.Kunov, A.B.Krepin, S.N.Kuznetsov,
V.P.Ladygin , Y.Maeda, A.I.Malakhov, P.K.Manjakov, G.Martinsky, B.Matoushek,
S.Nedev, T.Ohnishi, H.Okamura, V.N.Penev, E.B.Plekhanov, A.I.Reshetin, S.G.Reznikov,
P.A.Rukoyatkin, T.Saito, H.Sakai, Y.Sakemi, Y.Satou, K.Sekiguchi, K.A.Shileev,
G.D.Stoletov, K.Suda, A.Tamii, A.A.Titov, A.A.Toropin, I.Tsakov, J.Urban, T.Uesaka,
T.A.Vasiliev, T.Wakasa, T.Wakui, K.Yako, V.N.Zhmyrov
CNS, Univ. of Tokyo, JINR,RIKEN, Institute of Nuclear Research and Nuclear Energy,University of Tokyo, National Institute of Research and Development for Optoelectronics,Saitama University, University of Chemical Technology and Metallurgy,RCNP, Osaka University, Institute of Physics Slovac Academy of Sciences,Tohoku University Soltan Institute for Nuclear Studies,
P.J.Safarik University,Institute for Nuclear Research RAS,St.-Petersburg State University
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