Calibration of the polarimeter POMME at proton energies between 1.05 and 2.4 GeV

Cheung, N.E.; Perdrisat, C. F.; Oh, Jang-Jin; Beard, K.; Punjabi, V.; Yonnet, Jean‐Paul; Beurtey, R.; Boivin, M.; Plouin, F.; Tomasi–Gustafsson, E.; Boudard, A.; Abegg, R.; Ladygin, V. P.; Penchev, L.; Пискунов, Н. М.; Sitnik, I.M.; Strokovsky, E. A.; Belostotsky, S.L.; Vikhrov, V.; Frascaria, R.; Johnson, B.; Siebert, R.; Warde, E.; Jacobs, W. W.; Oers, W. T. H. van; Lippert, C.; Nanda, S.

doi:10.1016/0168-9002(95)00442-4

Cited by 24 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The spin transport analysis is similar to that of [19]. Our measurements [20] agree well with previous data for the form factor ratio [19] and for the carbon analyzing power [19,21,22]. The induced polarization in ep elastic scattering vanishes -neglecting small effects from two-photon exchange -allowing a direct measurement of the false asymmetries in the polarimeter.…”

Section: (Received 15 September 2000; Revised Manuscript Received 19 supporting

confidence: 79%

Polarization Measurements in High-Energy Deuteron Photodisintegration

Wijesooriya¹,

Afanasev²,

Amarian³

et al. 2001

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

We present measurements of the recoil proton polarization for the d͑ g, p͒n reaction at u c.m. 90 ± for photon energies up to 2.4 GeV. These are the first data in this reaction for polarization transfer with circularly polarized photons. The induced polarization p y vanishes above 1 GeV, contrary to meson-baryon model expectations, in which resonances lead to large polarizations. However, the polarization transfer C x does not vanish above 1 GeV, inconsistent with hadron helicity conservation. Thus, we show that the scaling behavior observed in the d͑g, p͒n cross sections is not a result of perturbative QCD. These data should provide important tests of new nonperturbative calculations in the intermediate energy regime. DOI: 10.1103/PhysRevLett.86.2975 One of the central goals of nuclear physics is to determine the role of quarks and gluons in nuclei and in nuclear reactions. Traditionally, nuclei and nuclear reactions are

show abstract

Section: (Received 15 September 2000; Revised Manuscript Received 19 supporting

confidence: 79%

Polarization Measurements in High-Energy Deuteron Photodisintegration

Wijesooriya¹,

Afanasev²,

Amarian³

et al. 2001

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The available data, as well as the projection from the future JLab experiment E12-07-109 [8], are shown in Figure 1. Note that polarization experiments are made possible by the tremendous progress in hadron polarimetry at the Saturne synchrotron [9,10]. Higher momenta are presently achievable only in Dubna, where the ALPOM collaboration currently pursues systematic studies [11,12].…”

Section: Recent Highlights On Space-like Proton Form Factorsmentioning

confidence: 99%

Dynamical Properties of Baryons

2021

View full text Add to dashboard Cite

The internal structure of composite particles is conveniently described in terms of form factors (FFs)—these are experimentally accessible in annihilation and scattering of elementary reactions, and are theoretically calculable by all models that describe the properties of particles. FFs depend only on one kinematical variable, q2. This is the four-momentum transferred by the virtual photon that carries the interaction. Important developments in accelerator and detector techniques have brought impressive advances, both by extending the kinematical region and by reaching a higher precision. A critical review on the underlying methods and findings in polarized and unpolarized experiments is presented. The unique role played by polarization in determining the ratio of electric to magnetic form factors in the space-like region, and the extraction of individual form factors in the whole kinematical region, are described. Recent results at electron accelerators and electron–positron colliders confirm the existence of periodical structure in the annihilation cross section. We suggest a global framework which describes the dynamical structure of charge distribution in baryons, in order to build a coherent view of the creation and annihilation of baryonic matter.

show abstract

“…The d(p, p )n data are consistent with elastic p + p → p + p measurements [35] so that these experiments are equivalent to free polarized pp and pn scattering. Inclusive measurements of p + CH 2 → p + X [2], and p + C → p + X have been obtained for the calibration of proton polarimeters used at ANL, JINR Dubna and JLab [1,36]. The data displayed in Fig.…”

Section: Polarimetry In the Gev Regionmentioning

confidence: 99%

“…C or CH 2 are often used as the analyzers in proton polarimeters. Analyzing power measurements were made at Saclay [1] (and references therein) and Dubna [2], using thick analyzers, and as part of a program of study of elastic and quasi-elastic dp reactions [3] up to incident momenta of several GeV/c. New measurements at Dubna will extend the incident momenta up to 7.5 GeV/c [4].…”

Section: Introductionmentioning

confidence: 99%

“…In comparison to proton scattering, the analyzing power A y for polarized neutron scattering at GeV energies is poorly known. Analyzing powers for n + p → n + p and n + p → p + n scattering exist only for thin 1 H or 2 H targets. Free np scattering is in principle the best analyzer of neutron polarization, but the use of a hydrogen analyzer is challenging technically and up to now scattering from C, CH or CH 2 has most commonly been used.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of neutron and proton analyzing powers on $C$, $CH$, $CH_2$ and $Cu$ targets in the momentum region 3-4.2 GeV/c

Basilev,

Bushuev,

Gavrishchuk

et al. 2019

Preprint

Self Cite

View full text Add to dashboard Cite

The analyzing powers for proton elastic scattering (pA → pX) and neutron charge exchange (nA → pX) reactions on nuclei have been measured on C, CH, CH2 and Cu targets at incident neutron momenta 3.0 -4.2 GeV/c by detecting one charged particle in forward direction. The polarized neutron measurements are the first of their kind. The experiment was performed using the Nuclotron accelerator in JINR Dubna, where polarized neutrons and protons were obtained from breakup of a polarized deuteron beam which has a maximum momentum of 13 GeV/c. The polarimeter ALPOM2 was used to obtain the analyzing power dependence on the transverse momentum of the final-state nucleon. These data have been used to estimate the figure of merit of a proposed experiment at Jefferson Laboratory to measure the recoiling neutron polarization in the quasi-elastic 2 H(e, e n) reaction, which yields information on the charge and magnetic elastic form factors of the neutron.

show abstract

Calibration of the polarimeter POMME at proton energies between 1.05 and 2.4 GeV

Cited by 24 publications

References 9 publications

Polarization Measurements in High-Energy Deuteron Photodisintegration

Polarization Measurements in High-Energy Deuteron Photodisintegration

Dynamical Properties of Baryons

Measurement of neutron and proton analyzing powers on $C$, $CH$, $CH_2$ and $Cu$ targets in the momentum region 3-4.2 GeV/c

Contact Info

Product

Resources

About