We report the results of a new measurement of spin structure functions of the deuteron in the region of moderate momentum transfer ($Q^2$ = 0.27 -- 1.3 (GeV/c)$^2$) and final hadronic state mass in the nucleon resonance region ($W$ = 1.08 -- 2.0 GeV). We scattered a 2.5 GeV polarized continuous electron beam at Jefferson Lab off a dynamically polarized cryogenic solid state target ($^{15}$ND$_3$) and detected the scattered electrons with the CEBAF Large Acceptance Spectrometer (CLAS). From our data, we extract the longitudinal double spin asymmetry $A_{||}$ and the spin structure function $g_1^d$. Our data are generally in reasonable agreement with existing data from SLAC where they overlap, and they represent a substantial improvement in statistical precision. We compare our results with expectations for resonance asymmetries and extrapolated deep inelastic scaling results. Finally, we evaluate the first moment of the structure function $g_1^d$ and study its approach to both the deep inelastic limit at large $Q^2$ and to the Gerasimov-Drell-Hearn sum rule at the real photon limit ($Q^2 \to 0$). We find that the first moment varies rapidly in the $Q^2$ range of our experiment and crosses zero at $Q^2$ between 0.5 and 0.8 (GeV/c)$^2$, indicating the importance of the $\Delta$ resonance at these momentum transfers.

Spin structure

10.1103/physrevc.67.055204

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Citations (42)

Measurement of R_LT, R_TT, and R_LT^' structure functions in the quasi-elastic ^2H(e,e'p) reaction at 200 (MeV/c) missing momentum

APS April Meeting Abstracts (1997)

S. Soong Alison I. Bernstein W. Bertozzi J. Chen G. Dodson

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N*electroproduction and propagation in nuclei

Physical Review C (1993)

L. B. Weinstein John H. Morrison Alfred M. Perry H. Baghaei W. Bertozzi

We have measured the $^{12}\mathrm{C}$(${\ensuremath{\gamma}}^{\mathrm{*}}$,${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$p${)}^{11}$${\mathrm{C}}_{\mathrm{g}.\mathrm{s}.}$ cross section using virtual bremsstrahlung at three points at invariant masses of 1444 and 1530 MeV. At low neutron initial momentum (${\mathit{p}}_{\mathit{m}}$\ensuremath{\approxeq}60 MeV/c) and large ${\mathit{N}}^{\mathrm{*}}$ momentum (${\mathit{p}}_{\mathit{N}}^{\mathrm{*}}$\ensuremath{\approxeq}750 MeV/c) the measured cross section is at or below the distorted wave impulse approximation (DWIA) calculation. At larger initial momentum (${\mathit{p}}_{\mathit{m}}$\ensuremath{\approxeq}220 MeV/c) and smaller ${\mathit{N}}^{\mathrm{*}}$ momentum (${\mathit{p}}_{\mathit{N}}^{\mathrm{*}}$\ensuremath{\approxeq}500 MeV/c), the measured cross section is almost twice as large as the DWIA calculation. This discrepancy might be due to ${\mathit{N}}^{\mathrm{*}}$-nucleus interactions.

10.1103/physrevc.47.225

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Measurement of the Longitudinal, Transverse, and Longitudinal-Transverse Structure Functions in theH2(e,e

Physical Review Letters (1996)

David W. Jordan T. McIlvain Ricardo Alarcón R. Beck W. Bertozzi

We have separated the longitudinal (f00), transverse (f11), and longitudinal-transverse interference (f01) structure functions in the 2H(e,e′p)n reaction at |q→|≈400MeV/c and ω≈110MeV. A nonrelativistic calculation which includes effects due to final state interactions, meson exchange currents, and isobar configurations agrees with the measured f11 and f01 but overpredicts f00 by 25% ( 2σ). The data are also compared to the results of previous structure function measurements.Received 24 July 1995DOI:https://doi.org/10.1103/PhysRevLett.76.1579©1996 American Physical Society

10.1103/physrevlett.76.1579

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Identification and Imaging of Special Nuclear Materials and Contraband using Active x-ray Interrogation

Physics Procedia (2017)

Seth Van Liew W. Bertozzi N. D׳Olympia Wilbur A. Franklin Stephen E. Korbly

A x-ray inspection system utilizing a continuous-wave 9 MeV rhodotron x-ray source for scanning cargo containers is presented. This system scans for contraband, anomalies, stowaway passengers, and nuclear threats for trucks and towed cargo containers. A transmission image is generated concurrently with a 3D image of the cargo, the latter presenting material information in the form of atomic number and density. Neutrons from photofission are also detected during each scan. In addition, nuclear resonance fluorescence detectors are capable of identifying specific isotopes. This system has recently been deployed at the Port of Boston.

Photofission

Nuclear material

Fissile material

Interrogation

Neutron Imaging

10.1016/j.phpro.2017.09.023

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The Transverse Asymmetry A{sub T}, from Quasi-elastic {sup 3}{ovr He}({rvec e}, e{prime}) Process and the Neutron Magnetic Form Factor

Physical Review Letters (2000)

Wang Xu D. Dutta Feng Xiong B. Anderson L. B. Auerbach

We have measured the transverse asymmetry from inclusive scattering of longitudinally polarized electrons from polarized {sup 3}He nuclei at quasi-elastic kinematics in Hall A at Jefferson Lab with high statistical and systematic precision. The neutron magnetic form factor was extracted based on Faddeev calculations with an experimental uncertainty of less than 2%.

Magnetic form factor

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Applications of Photonuclear Physics for International Safeguards and Security

M. S. Johnson Jonathan M. M. Hall D. P. McNabb Jack W. McFarland E. Norman

Studies of nuclear resonance fluorescence based applications are presented. Important for these applications are data for isotopes such as {sup 239}Pu. Nuclear resonance fluorescence measurements of {sup 239}Pu were performed at the free electron laser facility at UC Santa Barbara using photons from a bremsstrahlung beam with an endpoint energies between 4.0 MeV and 5.5 MeV. Though no discrete states with significant confidence level were measured, we have excluded the region above 27(3) eV-barns, or 4-sigma, where we would expect only a small chance of false positives. Details of the measurements and the results are presented here.

Giant resonance

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Inelastic electron scattering from collective levels ofGd154

Physical Review C (1986)

F. W. Hersman W. Bertozzi T. N. Buti J. M. Finn C. E. Hyde-Wright

Differential cross sections for elastic and inelastic scattering of electrons by $^{154}\mathrm{Gd}$ have been measured for states below 1 MeV of excitation. Levels of three major collective bands are studied: the ${0}^{+}$, ${2}^{+}$, ${4}^{+}$, and ${6}^{+}$ rotational states; the ${2}^{+}$ gamma vibration; and the ${0}^{+}$ and ${2}^{+}$ beta vibrational levels. This study includes the first electron scattering measurements of a beta vibration. Extraction of these small inelastic cross sections required improvements in momentum resolution and detector response uniformity. Data from the rotational band are compared with axially symmetric Hartree-Fock predictions. Disagreement between the measurements and Legendre projections of the calculated density, particularly for higher multipolarity states, indicates a breakdown in the Hartree-Fock approximation or the rotational model. Small amplitude vibrations of the nuclear shape derived from the measured rotational densities agree well in shape when independently normalized to the cross section strength for both the beta and gamma ${2}^{+}$ vibrations, substantiating their geometrical interpretations. Once transition strength of the beta band is set, however, the strength and shape of the ${0}^{+}$ beta is not correctly predicted, indicating a more complicated configuration.

BETA (programming language)

10.1103/physrevc.33.1905

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Precision Measurement of the Spin-Dependent Asymmetry in the Threshold Region of3H→e(e

Physical Review Letters (2001)

Feng Xiong D. Dutta W. Xu B. D. Anderson L. Auberbach

We present the first precision measurement of the spin-dependent asymmetry in the threshold region of 3He(e,e') at Q2 values of 0.1 and 0.2 (GeV/c)2. The agreement between the data and nonrelativistic Faddeev calculations which include both final-state interactions and meson-exchange current effects is very good at Q2 = 0.1 (GeV/c)2, while a small discrepancy at Q2 = 0.2 (GeV/c)2 is observed.

10.1103/physrevlett.87.242501

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Citations (23)