Spin-Dependent Electron Scattering from Polarized Protons and Deuterons with the BLAST Experiment at MIT-Bates

Hasell, D.; Milner, R.; Redwine, R.; Alarcón, R.; H, Gao; Köhl, M.; Calarco, J. R.

doi:10.1146/annurev-nucl-100809-131956

Cited by 33 publications

(27 citation statements)

References 105 publications

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“…The experiment was carried out with the Bates Large Acceptance Spectrometer Toroid (BLAST) in the South Hall Ring of the MIT-Bates Linear Accelerator Center; see [21,22] for details. An electron beam of up to 300 mA was stored with 65% longitudinal polarization preserved with a Siberian snake.…”

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confidence: 99%

“…The combination of polarized beam, polarized hydrogen, and vector-tensor-polarized deuterium target and a large acceptance spectrometer allowed asymmetry data to be collected simultaneously, over a large Q 2 range, in many reaction channels, such as 1H ðẽ; e 0 pÞ [24], 2H ðẽ; e 0 nÞ [25], 2H ðẽ; e 0 pÞ, andẽ-d, e-d $ elastic scatterings [22]. The results and further impact from the latter reaction channel are reported here.…”

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confidence: 99%

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Precise Measurement of Deuteron Tensor Analyzing Powers with BLAST

et al. 2011

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We report a precision measurement of the deuteron tensor analyzing powers T(20) and T(21) at the MIT-Bates Linear Accelerator Center. Data were collected simultaneously over a momentum transfer range Q=2.15-4.50 fm(-1) with the Bates Large Acceptance Spectrometer Toroid using a highly polarized deuterium internal gas target. The data are in excellent agreement with calculations in a framework of effective field theory. The deuteron charge monopole and quadrupole form factors G(C) and G(Q) were separated with improved precision, and the location of the first node of G(C) was confirmed at Q=4.19±0.05 fm(-1). The new data provide a strong constraint on theoretical models in a momentum transfer range covering the minimum of T(20) and the first node of G(C).

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confidence: 99%

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Precise Measurement of Deuteron Tensor Analyzing Powers with BLAST

et al. 2011

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“…де θ e -кут розсiяння у лабораторнiй системi; p -iмпульс дейтрона в одиницях fm −1 ; p 2 = 4EE / sin 2 θe 2 -квадрат 4-iмпульсу передачi; E i E / -початкова i кiнцева енергiї; A(p) i B(p) -функцiї електричної та магнiтної структури 63 МеВ -дейтронна маса. Тут зарядовий F C (p), квадрупольний F Q (p) i магнiтний F M (p) формфактори мiстять iнформацiю про електромагнiтнi властивостi дейтрона: ; G En = 0; G M p = µ p G Ep ; G M n = µ n G Ep ; де µ p i µ n -протонний i нейтронний магнiтний моменти в ядерних магнетонах.…”

Section: асиметрIя тензорної I векторної поляризацIйunclassified

Analytical forms of the wave function and the asymmetry of the polarization characteristics of the deuteron

Zhaba¹

2017

J. Phys. Stud.

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The basic analytical forms for the deuteron wave function (DWF) in coordinate representation have been reviewed. The asymptotic behaviors of DWF near the origin of coordinates have been analyzed. New analytical forms DWF as a product of exponential function r n by the sum of the exponential terms A i *exp(-a i * r 3 ) are applied for calculation polarization characteristics of the deuteron. Numerical calculations have been done for realistic phenomenological potential Nijmegen groups -Reid93. In paper the results of angular asymmetry for deuteron vectort 10 , t 11 and tensort 20 , t 21 , t 22 polarizations are submitted. Except for angular asymmetry, is present as well momentum asymmetry for deuteron vector t 1i polarizations. Influence of approximation DWF in coordinate representation on the subsequent results of calculations tensor polarization t 20 is investigated. Comparison of values t 20 is made at θ=70 degree if to apply four different approximations DWF for same NN potential Reid93. At comparison of the received theoretical values t 20 with experimental data of world collaborations and reviews the good coordination for area of values momentum p=1-4 fm −1 is observed. Within the framework of a method of invariant amplitude have been calculated spin observables in backward elastic dp-scattering -tensor analyzing power T 20 and polarization transfer κ 0 . Are compared values for κ 0 and correlation κ 0 − T 20 with experimental data's. In a wide range of momentums p and angles θ scattering have been presented asymmetry for tensor analyzing power T 20 and T 22 , which characterize photoproduction for negative π-meson from deuteron in reaction γ(d,π − )pp. Symmetry of values T 20 and T 22 concerning a angle 90 degree is observed. Ratio R for vector P x and tensor P xz polarizations is characterized by angular asymmetry. So, near to "A y puzzle" remain actual theoretical and experimental researches of other polarization characteristics for processes at participation deuteron for which is present both angular, and momentum asymmetry. The obtained results of the deuteron vector and tensor polarizations t ij (p) give some information about the electromagnetic structure of the deuteron and the differential cross section of double scattering.Аналiтичнi форми хвильової функцiї i асиметрiя поляризацiйних характеристик дейтрона В.I. ЖабаУжгородський нацiональний унiверситет, кафедра теоретичної фiзики, вул. Волошина, 54, Ужгород, 88000, Україна Проведено огляд та аналiз асимптотичної поведiнки основних аналiтичних форм хвильової функцiї дейтрона (ХФД) в координатному представленнi. Для розрахунку поляризацiйних характеристик дейтрона застосовано новi аналiтичнi форми ХФД у виглядi добутку степеневої функцiї r n на суму експоненцiальних членiв A i ·exp(-a i ·r 3 ). Для чисельних обчислень використано реалiстичний феноменологiчний потенцiал Reid93. У роботi представленi результати кутової асиметрiї для векторних t 10 , t 11 i тензорних t 20 , t 21 , t 22 дейтронних поляризацiй. Окрiм кутової асиметрiї, наявна й iмпульсна ...

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“…The Bates Large Acceptance Spectrometer Toroid (BLAST) experiment used a polarized electron beam 1 incident upon an internal polarized deuterium target [17,42] at the MIT-Bates accelerator. An atomic beam source was used for the polarized deuterium target, providing considerable freedom in the choice of vector and tensor polarization states.…”

Section: B Batesmentioning

confidence: 99%

“…In particular, quasi-elastic scattering off the deuteron has been widely studied [16,17] as an ideal reaction to disentangle various contributions to the reaction mechanism, such as relativistic effects, non-nucleonic components of the deuteron wave function, meson-exchange (MEC) and isobar (IC) currents, and final state interactions (FSI) between the outgoing nucleons. Recent experiments [18,19] have focused on higher momentum transfers, where one-nucleon currents are expected to dominate the cross section.…”

Section: Introductionmentioning

confidence: 99%

Beam-target double-spin asymmetry in quasielastic electron scattering off the deuteron with CLAS

Mayer¹,

Kuhn²,

Adhikari³

et al. 2017

Phys. Rev. C

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Background: The deuteron plays a pivotal role in nuclear and hadronic physics, as both the simplest bound multi-nucleon system and as an "effective neutron target". Quasi-elastic electron scattering on the deuteron is a benchmark reaction to test our understanding of deuteron structure and the properties and interactions of the two nucleons bound in the deuteron.Purpose: The experimental data presented here can be used to test state-of-the-art models of the deuteron and the two-nucleon interaction in the final state after two-body breakup of the deuteron. Focusing on polarization degrees of freedom, we gain information on spin-momentum correlations in the deuteron ground state (due to the D-state admixture) and on the limits of the Impulse Approximation (IA) picture as it applies to measurements of spin-dependent observables like spin structure functions for bound nucleons. Information on this reaction can also be used to reduce systematic uncertainties on the determination of neutron form factors or deuteron polarization through quasi-elastic polarized electron scattering.Method: We measured the beam-target double spin asymmetry (A || ) for quasi-elastic electron scattering off the deuteron at several beam energies (1.6−1.7 GeV, 2.5 GeV, 4.2 GeV and 5.6−5.8 GeV), using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. The deuterons were polarized along (or opposite to) the beam direction. The double spin asymmetries were measured as a function of photon virtuality Q 2 (0.13−3.17 (GeV/c) 2 ), missing momentum (pm = 0.0 − 0.5 GeV/c), and the angle between the (inferred) "spectator" neutron and the momentum transfer direction (θnq). Results:The results are compared with a recent model that includes Final State Interactions (FSI) using a complete parameterization of nucleon-nucleon scattering, as well as a simplified model using the Plane Wave Impulse Approximation (PWIA). We find overall good agreement with both the PWIA and FSI expectations at low to medium missing momenta (pm ≤ 0.25 GeV/c), including the change of the asymmetry due to the contribution of the deuteron D-state at higher momenta. At the highest missing momenta, our data clearly agree better with the calculations including FSI. Conclusions:Final state interactions seem to play a lesser role for polarization observables in deuteron twobody electro-disintegration than for absolute cross sections. Our data, while limited in statistical power, indicate that PWIA models work reasonably well to understand the asymmetries at lower missing momenta. In turn, this information can be used to extract the product of beam and target polarization (P b Pt) from quasi-elastic electrondeuteron scattering, which is useful for measurements of spin observables in electron-neutron inelastic scattering. However, at the highest missing (neutron) momenta, FSI effects become important and must be accounted for.

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Spin-Dependent Electron Scattering from Polarized Protons and Deuterons with the BLAST Experiment at MIT-Bates

Cited by 33 publications

References 105 publications

Precise Measurement of Deuteron Tensor Analyzing Powers with BLAST

Precise Measurement of Deuteron Tensor Analyzing Powers with BLAST

Analytical forms of the wave function and the asymmetry of the polarization characteristics of the deuteron

Beam-target double-spin asymmetry in quasielastic electron scattering off the deuteron with CLAS

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