Author
J. E. Nelson
Bio: J. E. Nelson is an academic researcher from Argonne National Laboratory. The author has contributed to research in topics: Nuclear reaction & Photodisintegration. The author has an hindex of 5, co-authored 7 publications receiving 114 citations.
Papers
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TL;DR: In this paper, the authors measured the differential cross section for two-body deuteron photodisintegration at θc.m.=90° and for photon energies between 0.8 and 1.6 GeV.
Abstract: We have measured the differential cross section for two-body deuteron photodisintegration at θc.m.=90° and for photon energies between 0.8 and 1.6 GeV. At energies above ≃ 1.2 GeV, the data appear to obey a simple scaling law predicted by constituent-counting rules assuming parton degrees of freedom for the deuteron and nucleons. Agreement with model calculations based on meson exchange or "reduced nuclear amplitudes" is discussed.
37 citations
TL;DR: The differential cross section for the reaction 2H(γ,p)n has been measured at several center-of-mass angles and the energy dependence of the cross sections is consistent with predictions of scaling using counting rules for constituent quarks.
Abstract: The differential cross section for the reaction 2H(γ,p)n has been measured at several center-of-mass angles ranging from 50° to 143° for photon energies between 0.8 and 1.8 GeV. The experiment was performed at the SLAC-NPAS facility with the use of the 1.6 GeV/c spectrometer to detect the high energy protons produced by a bremsstrahlung beam directed at a liquid deuterium target. Contributions from concurrent disintegration by the residual electron beam were determined by measuring the proton yield without the Cu photon radiator. At angles not very far from 90°, the energy dependence of the cross sections is consistent with predictions of scaling using counting rules for constituent quarks. At least one theoretical calculation based on a meson-baryon picture of the reaction is able to reproduce the magnitude and energy dependence of the 90° cross section. The angular distribution exhibits a large enhancement at backward angles at the higher energies.
29 citations
TL;DR: In this paper, the authors measured the cross section for radiative capture of thermal neutrons on the Sun and used it to estimate the astrophysical S factor for the reaction, which gives rise to high-energy neutrinos from the Sun.
Abstract: We have measured the cross section for radiative capture of thermal neutrons on $^{3}\mathrm{He}$. The measured cross section of 54\ifmmode\pm\else\textpm\fi{}6 \ensuremath{\mu}b is used to estimate the astrophysical S factor for the reaction $^{3}\mathrm{He}$(p,${e}^{+}$\ensuremath{
u}${)}^{4}$He which gives rise to high-energy neutrinos from the Sun.
26 citations
TL;DR: In this article, a 20-ton neutrino detector located near the Los Alamos Meson Physics Facility beam stop was used to search for neutrinos generated via neutro oscillations from any of the three types of types, i.e., [nu][sub [mu], [bar [nu]], [sub [m]], and [nu]-sub [n]], which radiate from the beam stop, and the analysis of three years of data provided limits on the oscillation modes.
Abstract: A 20-ton neutrino detector located near the Los Alamos Meson Physics Facility beam stop is used to search for [bar [nu]][sub [ital e]] generated via neutrino oscillations from any of the three neutrino types, [nu][sub [mu]], [bar [nu]][sub [mu]], and [nu][sub [ital e]], which radiate from the beam stop. The analysis of three years of data provides limits on the oscillation modes [bar [nu]][sub [mu]][r arrow][bar [nu]][sub [ital e]], [nu][sub [ital e]][r arrow][bar [nu]][sub [ital e]], and [nu][sub [mu]][r arrow][bar [nu]][sub [ital e]], and the lepton-number-violating decay process [mu][sup +][r arrow][ital e][sup +]+[bar [nu]][sub [ital e]]+[nu][sub [mu]]. The 90%-confidence-level limits for [bar [nu]][sub [mu]][r arrow][bar [nu]][sub [ital e]] oscillations are [delta][ital m][sup 2][le]0.14 eV[sup 2] for maximal mixing, and sin[sup 2]2[theta][le]0.024 for large [delta][ital m][sup 2].
16 citations
TL;DR: The ratio of resonance strengths for alpha capture on /sup 6/Li to the 4.77- and 5.16-MeV states of /sup 10/B is measured and the agreement between this result and Kurath's interpretive model for /sup10/B improves when collective effects in the 1p shell are included.
Abstract: We have measured the ratio of resonance strengths for alpha capture on /sup 6/Li to the 4.77- and 5.16-MeV states of /sup 10/B. We find ..omega gamma..(4.77)/..omega gamma..(5.16) = 0.102 +- 0.004. When combined with the accepted value for ..omega gamma..(5.16) we determine the E2 strength of the 4.77- to 0.72-MeV level transition in /sup 10/B to be B(E2) = 21 +- 2 e/sup 2/fm/sup 4/, in agreement with a previous measurement when center-of-mass corrections are properly taken into account. The agreement between our result and Kurath's interpretive model for /sup 10/B improves when collective effects in the 1p shell are included.
6 citations
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TL;DR: A review of the evidence on the properties of the nuclei A = 8, 9 and 10, with emphasis on material leading to information about the structure of the A =8, 9, 10 systems is given in this paper.
643 citations
KEK1
TL;DR: In this article, the current theoretical and experimental status of the field of muon decay and its potential to search for new physics beyond the standard model is reviewed, together with the recent up-to-date motivations of lepton flavor violation based on supersymmetric models.
Abstract: This article reviews the current theoretical and experimental status of the field of muon decay and its potential to search for new physics beyond the standard model. The importance of rare muon processes with lepton flavor violation is highly stressed, together with precision measurements of normal muon decay. Recent up-to-date motivations of lepton flavor violation based on supersymmetric models, in particular supersymmetric grand unified theories, are described along with other theoretical models. Future prospects of experiments and muon sources of high intensity for further progress in this field are also discussed.
604 citations
TL;DR: A review of evidence on the properties of the A = 11 nuclei is given in this paper, with emphasis on the material leading to information about the structure of the a = 11 systems.
177 citations
TL;DR: In this paper, a neutrino appearance experiment with sensitivity to oscillation probability Pijexp can be used to detect new physics in neutrinos interactions if its strength GN satisfies (G N G F ) 2 ∼ P ij exp.
169 citations
01 Jan 2014
TL;DR: An evaluation of A = 16-17 was published in Nuclear Physics A564 (1993), p. 1. as mentioned in this paper corrected some errors discovered after the article went to press.
Abstract: An evaluation of A = 16-17 was published in Nuclear Physics A564 (1993), p. 1. This version of A = 17 differs from the published version in that we have corrected some errors discovered after the article went to press. The introductio n and introductory tables have been omitted from this manuscript. Reference key numbers have been changed to the NNDC/TUNL format.
121 citations