Yury Gurchin June 2011

MEASUREMENT OF THE CROSS-SECTION IN

DP-ELASTIC SCATTERING AT THE ENERGIES OF 500 AND 880 MEV AT NUCLOTRON

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The purpose of DSS (Deuteron Spin Structure) project is broadening of energy and angular ranges of measurement of different variables in processes including 3-nucleon systems. The main aim of offered experiment program is extraction of information from spin depending part of 3-nucleon forces.

DSS project experimental program includes 2 experiments, one of them is the experiment of dp-elastic scattering study. During it will be done measurement of cross-section, vector Ay, tensor Ayy and Axx analyzing powers in dp-elastic scattering in the range of 300 and 1000 MeV of the deuteron kinetic energy.

The goal for the nearest runs is to measure the cross-section of dp-elastic scattering reaction in wide deuteron energy range with the step not more than 100 MeV in the region from 500-1000 MeV. This is needed for an experiment to measure analyzing powers for the dp-elastic scattering.

DSS project

The main aim of present investigation is to measure the cross-section of dp-elastic scattering at the energies of 500 and 880 MeV using kinematical coincidences of deuteron and proton with simple plastic scintillation counters and CH2 and C targets at the internal target station at the Nuclotron.

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Internal Target Station

targetbeam

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Scheme of the experiment

PP-L

PP-R

D

P

M1-6

Horizontal

plane

Vertical

plane

Beam

P and D - proton and deuteron detectors (dp-elastic scattering)

PP-L and PP-R –proton detectors (pp-quasi elastic scattering)

M 1-6 - monitor counters.

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Experimental setup at the Internal Target Station

Internal targetDetector’s base

P and D detector Beam

Photomultiplier FEU-85

PMT base

Hull

Scintillator

Scintilator’s cover

Counter # 2 for P and D detectors

-Scintillators: 1) 20*25*5 mm or 10*25*5mm (counter #1) 2) 20*25*20 mm (counter #2)

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Data handling

The results obtained at 880MeV deuteron beam on polyethylene target: a) deuteron energy losses, b) proton energy losses, c) correlation of proton and deuteron energy losses, d) time difference between the signals for deuteron and proton detectors.

CH2

DATA

880MeV

Proton energy losses

Deuteron energy losses

Deuteron energy losses (channels)

Pro

ton

en

erg

y l

os

se

s (

ch

an

ne

ls)

Deuteron energy losses (channels)

Proton energy losses (channels)

N e

ve

nts

N e

ve

nts

N e

ve

nts

Deuteron & Proton energy losses

Deuteron-Proton TOF

Deuteron-Proton TOF (channels)

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Data handling

N e

ven

ts

N e

ven

ts

N e

ven

ts

TDC SPECTRA FITTING

TDC (Channels)TDC (Channels) TDC (Channels)

Gauss+Const fit

MPV - 4*Sigma MPV + 4*Sigma

TDC spectra with gates

880 MeV

СН2 target

60 deg. c.m.

deuteron scattering

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D e

ner

gy

loss

es (

chan

nel

s)

P energy losses (channels) P energy losses (channels)

D e

ner

gy

loss

es (

chan

nel

s)

D e

ner

gy

loss

es (

chan

nel

s)

P energy losses (channels) P energy losses (channels)

D e

ner

gy

loss

es (

chan

nel

s)

APPLYING ADC GRAPHICAL CRITERIA

)

ADC correlation w.o. TDC gates

ADC correlation with TDC gates

ADC CORRELATION GRAPHICAL CRITERIA

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Time difference spectra obtained on polyethylene (a) and carbon (b) targets.

CH2

DATA

CARBON

DATA

Gauss+const fit

Getting normalization coefficient fitting the time difference spectra

K = constCH2CH2/constCC

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CH2-C time difference spectra subtraction

Time difference distribution for dp-elastic events obtained from CH2-C

CH2

C

TDC (channels) TDC (channels)

Result of CH2-С subtraction

N e

ven

ts

N e

ven

ts

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Event yield of dp-elastic scattering Td=880 MeV

d-angle (deg. c.m.s)

even

t yi

eld

Event yield=Ndp-elastic/Npp-quasielastic

Td=880MeV

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PRELIMINARY

Cross section of dp-elastic scattering Td=880MeV(m

b/s

r)

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Cross section of dp-elastic scattering Td=500MeV

PRELIMINARY

(mb

/sr)

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Conclusions

The following results has been obtained:

The procedure of the dp-elastic scattering cross-section measurements at internal target station at Nuclotron using CH2-C subtraction has been established.

The first results of the cross-section measurement in dp-elastic scattering at the energies of 500 and 880 MeV have been obtained. The results show the reasonable behaviour as the function of the scattering angle.

The goal for the nearest runs is to measure the cross-section of dp-elastic scattering reaction in wide deuteron energy range with the step not more than 100 MeV in the region from 500-1000 MeV.

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Collaboration

Yu.V.Gurchina, A.Yu.Isupova,M.Janeka,b,J.-T.Karachuka,c, A.N.Khrenova, V.A.Krasnova,

A.K.Kurilkina, P.K.Kurilkina, V.P.Ladygina, A.N.Livanova,S.M.Piyadina,

V.L.Rapatskya,S.G.Reznikova, A.A.Terekhina , T.A.Vasilieva

a JINR, Dubnab P.J.Shafaric University, Koshice, Slovakiac Advansed Research Institute for Electrical Engineering, Bucharest,

Romania

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THANK YOU!

Yury Gurchin