polarimetry of t ensor polarized deuteron beams 1 AP Kobushkin Bogolyubov Institute for Theoretical Physics Metrologicheskaya str 14B 03680 Kiev Ukraine EA Strokovsky Laboratory of High Energy Physics ID: 263545
Download Presentation The PPT/PDF document "Breakup reaction for" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Breakup reaction for polarimetry of tensor polarized deuteron beams
1
A.P. KobushkinBogolyubov Institute for Theoretical PhysicsMetrologicheskaya str. 14B03680 Kiev, UkraineE.A. StrokovskyLaboratory of High Energy PhysicsJoint Institute for Nuclear Research141980, Dubna, Russia
E.A.Strokovsky, Dubna, 18.03.2013
Based on talk given at the “SYMMETRIES
AND SPIN (SPIN-Praha-2012
)” Conference,
Prague
, July 1 - 8,
2012; JINR preprint
Е2-2013-14
,
Dubna
, JINR, 2013.
See also A.P.K. and E.A.S., Phys. Rev. C 87 (2013), 024002Slide2
2Common interest to the lightest nuclei structure at short distances or
highrelative momenta between constituents
resulted in lack of attention to behaviour of spin-dependent observables at long distances or at small relative momenta. To avoid this bias we paid special attention to behaviour of the observables at this small relative momenta region
as well.E.A.Strokovsky, Dubna, 18
.03.2013
The goal of this talk is to demonstrate that:
Deuteron breakup at 0
o
can be used for local
polarimeters at SPD as well as MPD. Polarization monitoring can be easily realized.
Existing
data obtained with polarized deuterons contain more physical information
than it was extracted so far
.Slide3
3Selected experimental data concerning the deuteron structure
(hadron probes; reminder).
E.A.Strokovsky, Dubna, 18.03.2013Slide4
4Total cross section for deuteron-proton scattering
(intermediate energy region
)E.A.Strokovsky, Dubna, 18.03.2013Slide5
Polarization transfer coefficient
(from vector polarized deuteronto proton)
Light cone variable5
Breakup (d,p)X at 0o, backward elastic scattering
Cross section
The key tool: polarized deuteron beams in
Dubna
and
Saclay
.
Tensor
analysing
power
E.A.Strokovsky
,
Dubna
,
18
.03.2013Slide6
6Deuteron breakupand the D2 parameter for deuteron
E.A.Strokovsky
, Dubna, 18.03.2013Slide7
7
E.A.Strokovsky
, Dubna, 18.03.2013At small k:
Definition for deuteron in literature:Slide8
8
M – nucleon mass, B – binding energy of deuteron
k in Fm-1
k in GeV/c
Knutson&Haeberli
(1976): D
2
=
(0.432
0.032);W. Gruebler et al (1980): d =
(
0.0259
0.0007
)
;
= -(22.19
0.82) when
k is taken in
GeV
/c
(Instead of
d
many people often use notation
d
).
E.A.Strokovsky
,
Dubna
,
18
.03.2013
D
d
2
is positive.Slide9
9
Reminder: existing data on deuteron breakup (inclusive)
E.A.Strokovsky, Dubna, 18.03.2013Slide10
10
Zoom at
the next slide
E.A.Strokovsky, Dubna, 18.03.2013Slide11
11
Excluded from the fit
Deuteron breakup by protons (Z=1)
Energy range:
T
kin
=2.1
GeV
(
Saclay
, data tables publ. in 1987 & 1989),
7.4
GeV
(
Dubna
, data tables publ.
in 1996
)
E.A.Strokovsky
,
Dubna
,
18
.03.2013Slide12
12Knutson&Haeberli (1976): 2D2 = (22.19
0.82) (k in GeV
/c)W. Gruebler et al : (1980 ): 2D2 = (24.80 0.67)Our fit of the p(d,p)X data: 2D2 = (23.70 0.33) Theoretical value of
d (or d) is around 0.0254 0.0259;experimental value (averaged) is 0.0256(4); what results in2D2 = 24.51 0.38
Taking into account that: the used spectator model does
not
include
some possible corrections (Coulomb first of all)
and
only statistical errors are taken into account andthose were not a dedicated measurements of T20 at low q
(the main interest was to the high
q
region),
the obtained value is in rather good agreement with
existing data even without optimization of the q-range.
The p(
d,p
)X reaction in
GeV
region
can be used as additional source for data on
d
(or
d
)
.
E.A.Strokovsky
,
Dubna
,
18
.03.2013Slide13
13From V.M.Krasnopol’sky et al, PhL
165B (1985) p.7: Potential: RSC
d = 0.0262 2D2 = 25,09 RHC d = 0.0259 2D2 = 24,80 Yale d = 0.0254 2D
2 = 24,32 Paris d = 0.0261 2D2 = 24,99
MSU (old)
d
= 0.0269
2D
2 = 25,76
From E. Epelbaum, Braz. Journ. Ph., v. 35, p. 854. (2005):
N
3
LO in
chiral
EFT:
d
= 0.0254
2D
2
= 24,32
d
= 0.0255
2D
2
= 24,42
From http://nn-online.org/, NN potential by Nijmegen group:
Nijm
II:
d
= 0.02521
2D
2
= 24,14
Nijm
93:
d
= 0.02524
2D
2
= 24,17
Reid93:
d
= 0.02514
2D
2
= 24,07
Our fit of the p(
d,p
)X (0
o
) data:
2D
2
= (23.70
0.33)
E.A.Strokovsky
,
Dubna
,
18
.03.2013Slide14
14Effects of the Coulomb interaction(hints)
E.A.Strokovsky
, Dubna, 18.03.2013Slide15
15A.P. KOBUSHKIN, YA.D. KRIVENKO-EMETOV, Ukr. J. Phys. 2008. V. 53, N 8, p.751
Dash-dotted line:
quasi-impulse approx.
Dashed line: multiple scatt. + Pauli principle
for all
constutuent
quarks in deuteron;
Full line:
Coulomb interaction is added
Deuteron breakup by carbon (Z=6)E.A.Strokovsky,
Dubna
,
18
.03.2013Slide16
16
Deuteron breakup by carbon (Z=6)
Tkin= 7.4 GeV (
Dubna, data tables publ. in 1990 & 1996)E.A.Strokovsky, Dubna, 18
.03.2013Slide17
17(1) deuteron beam polarimetry at intermediate and high energiesboth for
tensor polarization (energy independent, high figure of merit
T202!)and vector polarization (proton polarization must be measured); (2) obtaining new experimental data about the deuteron asymptotic D/S ratio;experimental estimates of Coulomb effects in deuteron breakup;the Coulomb effects in T20 are (apparently) small.
Conclusions.Deuteron breakup with spectator proton detection at 0o at momentum in vicinity of pd /2 is very
useful reaction for
:
E.A.Strokovsky
,
Dubna, 18.03.2013Slide18
18Thank you!
E.A.Strokovsky,
Dubna, 18.03.2013