Large volume neutron detectors with subnanosecond time dispersions

Madey, R.; Watson, J. W.; Ahmad, M.; Anderson, B. D.; Baldwin, A. R.; Casson, A.L.; Casson, W.H.; Cecil, R.A.; Fazely, A. R.; Knudson, J. N.; Lebo, C.; Pairsuwan, W.; Pella, P.J.; Varga, J.; Witten, Thomas R.

doi:10.1016/0167-5087(83)90608-7

Cited by 65 publications

(19 citation statements)

References 16 publications

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“…The long (100 cm) axes of these detectors were oriented horizontally and perpendicular to the central flight path and were stacked vertically into four layers of five detectors. The long ends of each scintillator were coupled via Plexiglas light guides to 2-inch Hamamatsu R1828-01 PMTs powered by bases designed specifically for this experiment for purposes of high gain and highly linear output under conditions of high rate [65].…”

Section: Front Arraymentioning

confidence: 99%

Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia the
Plaster¹,
Semenov²,
Aghalaryan³
et al. 2006
Phys. Rev. C
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Section: Front Arraymentioning

confidence: 99%

Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia the
Plaster¹,
Semenov²,
Aghalaryan³
et al. 2006
Phys. Rev. C
Self Cite

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“…These time-of-flight spectrometers evolved in the 1980s into polarimeters consisting of large-volume, mean-timed NE-102 plastic scintillation and BC517L mineral-oil scintillation detectors arranged in a "V-shape" [364][365][366]. The double-scattering efficiencies 2 and analyzing powers of these polarimeters were calibrated in a series of experiments at the Indiana University Cyclotron Facility (IUCF) and subsequently used to extract polarization transfer coefficients in the the 4 0,48Ca(/, i) reaction at 2 The efficiency of a neutron polarimeter is defined to be the probability that a neutron incident on the front analyzing detectors generates an event that satisfies all analysis thresholds and cuts.…”

Section: Historical Overview Of Npolmentioning

confidence: 99%

The neutron electric form factor to Q² = 1.45 (GeV/c)²

Plaster¹

2004

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The nucleon elastic electromagnetic form factors are fundamental quantities needed for an understanding of nucleon and nuclear electromagnetic structure. The evolution of the Sachs electric and magnetic form factors with Q 2 , the square of the fourmomentum transfer, is related to the distribution of charge and magnetization within the nucleon. High precision measurements of the nucleon form factors are essential for stringent tests of our current theoretical understanding of confinement within the nucleon.Measurements of the neutron form factors, in particular, those of the neutron electric form factor, have been notoriously difficult due to the lack of a free neutron target and the vanishing integral charge of the neutron. Indeed, a precise measurement of the neutron electric form factor has eluded experimentalists for decades; however, with the advent of high duty-factor polarized electron beam facilities, experiments employing polarization degrees of freedom have finally yielded the first precise measurements of this fundamental quantity.Following a general overview of the experimental and theoretical status of the nucleon form factors, a detailed description of an experiment designed to extract the neutron electric form factor from measurements of the neutron's recoil polarization in quasielastic 2 H(e, e')lH scattering is presented. The experiment described here employed the Thomas Jefferson National Accelerator Facility's longitudinally polarized electron beam, a magnetic spectrometer for detection of the scattered electron, and a neutron polarimeter designed specifically for this experiment. Measurements were conducted at three Q 2 values of 0.45, 1.13, and 1.45 (GeV/c) 2 , and the final results extracted from an analysis of the data acquired in this experiment are reported and compared with recent theoretical predictions for the nucleon form factors. Next, I would like to thank those who I credit most for my development: Jim Kelly and Andrei Semenov. At times, I found Jim's extremely high standards and desire for rigor to be exasperating, especially during the development of our simulation code and discussions of formalism (e.g., the "dreaded" Wigner rotation!), but, in retrospect, I am glad that I was constantly challenged to do something in an even better way and never permitted to give up. Indeed, I didn't fully appreciate the rigor of our analysis until our results were final, but hindsight is always 20/20. Also, I thank Jim for numerous comments and suggestions on this thesis; it is much better and much more complete because of his many suggestions. Andrei was the true guru (read: czar) of our analysis efforts, and he instilled in me the importance of careful work.I especially appreciate Andrei's timely responses to the numerous questions I always had concerning the analysis and the various analysis tools that we used; if there was someone who was sure to know the answer, that person was Andrei. Without Andrei, our analysis efforts would never have gotten off the ground. I also offer thank...

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“…This procedure is similar to the description in ref. [14]. The detection efficiency was determined by the Monte Carlo method described in ref [15].…”

Section: Introductionmentioning

confidence: 99%

Backward emitted high-energy neutrons in hard reactions ofpandπ+on carbon

et al. 2001

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Beams of protons and pions of 5.9 GeV/c were incident on a C target. Neutrons emitted into the back hemisphere, in the laboratory system, were detected in (triple) coincidence with two emerging p t >0.6 GeV/c particles. We present the momentum spectra of the backward going neutrons, which have the same universal shape observed in earlier (inclusive) reactions induced by hadrons, γ, ν, andν beams. We also integrated the spectra and determined the fraction of the hard scattering events which are in coincidence with at least one neutron emitted into the back hemisphere, with momenta above 0.32 GeV/c. Contrary to the earlier measurements which found that only a small fraction (of the order of 10%) of the total inelastic cross section for light nuclei was associated with backward going nucleons, we find that about half of the events are of this nature. We speculate that the reason for the large difference is the strong total center of mass (s) dependence of the hard reaction and short range nucleon correlations in nuclei. 24.50.+g 1

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Large volume neutron detectors with subnanosecond time dispersions

Cited by 65 publications

References 16 publications

Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia the
Plaster¹,
Semenov²,
Aghalaryan³
et al. 2006
Phys. Rev. C
Self Cite

Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia the
Plaster¹,
Semenov²,
Aghalaryan³
et al. 2006
Phys. Rev. C
Self Cite

The neutron electric form factor to Q² = 1.45 (GeV/c)²

Backward emitted high-energy neutrons in hard reactions ofpandπ+on carbon

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Large volume neutron detectors with subnanosecond time dispersions

Cited by 65 publications

References 16 publications

Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia thePlaster1, Semenov2, Aghalaryan3 et al. 2006Phys. Rev. CSelf Cite

Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia thePlaster1, Semenov2, Aghalaryan3 et al. 2006Phys. Rev. CSelf Cite

The neutron electric form factor to Q² = 1.45 (GeV/c)²

Backward emitted high-energy neutrons in hard reactions ofpandπ+on carbon

Contact Info

Product

Resources

About

Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia the
Plaster¹,
Semenov²,
Aghalaryan³
et al. 2006
Phys. Rev. C
Self Cite

Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia the
Plaster¹,
Semenov²,
Aghalaryan³
et al. 2006
Phys. Rev. C
Self Cite