Measurement of High Lying Nuclear Resonances and Search for Missing State in Double Charged Electroproduction Off the Proton PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
We have analyzed data taken by the CLAS collaboration in double charged pion electroproduction off the proton. We have used an isobar model specifically developed for the analysis of N [pi][pi] channel. This approach relates baryon resonance parameters to the experimental cross section, allowing the extraction of electromagnetic and some strong couplings from the fit to the data. A remarkable feature of the CLAS data is a resonance structure around 1.7 GeV which has not been seen in double pion photoproduction. The structure appears at all Q2 values from 0.5 to 1.5 GeV2 and it can not be reproduced with conventional N* values.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
We have analyzed data taken by the CLAS collaboration in double charged pion electroproduction off the proton. We have used an isobar model specifically developed for the analysis of N [pi][pi] channel. This approach relates baryon resonance parameters to the experimental cross section, allowing the extraction of electromagnetic and some strong couplings from the fit to the data. A remarkable feature of the CLAS data is a resonance structure around 1.7 GeV which has not been seen in double pion photoproduction. The structure appears at all Q2 values from 0.5 to 1.5 GeV2 and it can not be reproduced with conventional N* values.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
In this study, the transition helicity amplitudes from the proton ground state to the N(1440)1/2+, N(1520)3/2-, and [Delta](1620)1/2- resonances ([gamma]vpN* electrocouplings) were determined from the analysis of nine independent onefold differential [pi]+[pi]-p electroproduction cross sections off a proton target, taken with CLAS at photon virtualities 0.5GeV2
Author: Herbert Funsten Publisher: ISBN: Category : Languages : en Pages :
Book Description
Electroproduction data from CLAS at Jefferson Lab are being analyzed in order to identify resonant couplings to baryon resonances decaying into {pi}{Delta}, pN, or {omega}N. A multi-dimensional fit to the new two-pion electroproduction data not only provides better determined photocouplings of several resonances, but also implicates a significant correction of the hadronic couplings of resonances at W approx. 1.7 GeV. The electroproduction of w shows strong indications of u- and s-channel contributions at W below 2 GeV.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The 48Ti(p, gamma)49V reaction was studied in the energy range Ep = 2.0--2.8 MeV. This research was performed at the High Resolution Laboratory at Triangle Universities Nuclear Laboratory. Capture spectra were obtained for 27 compound nuclear resonances whose resonance parameters (energy, spin, parity, and particle widths) had been determined in earlier experiments. The gamma rays were measured with a Compton-suppressed HPGe detector. A total of ten 1/2+ resonances, nine 1/2- resonances and eight 3/2 - resonances were studied. The primary motivation for these measurements was to provide a data set suitable for testing the applicability of conventional statistical models in this mass region. A secondary motivation was to evaluate the 'low level population' method (which works very well in heavier nuclei) in this mass region. The relative populations of 10 of the first 12 excited states of 49V were determined (the relative populations of two of the low-lying states could not be obtained due to gamma-ray resolution limitations). The average relative populations were similar for the three types of resonances. The experimental relative populations were compared with calculations performed with the statistical model code DICEBOX. Results for a variety of radiative strength function models yielded qualitatively similar results. These simulations agree only qualitatively with the experimental relative populations. Although the simulations suggest that the low level population method may work in this nuclide, the experimental results are at best ambiguous. Thus the statistical approach provides a reasonable qualitative description (but not a quantitative description) of the relative population of low-lying states in 49V.
Author: Edmond John Haws Publisher: ISBN: Category : Science Languages : en Pages : 198
Book Description
"This linear programme, divided into six self-contained teaching 'packages', promotes a student-active approach to the subject of interpreting proton magnetic resonance spectra. The student, whether working on his own or in a class, is participating in the learning process rather than passively reading information. He is able to assess his progress continuously while working through the text at his own speed, and can directly compare the state of his knowledge before and after completing a section. The authors, who have a wide experience of programmed teaching in chemistry, cover all the essential basic aspects of the subject. Designed for industrial trainees as well as for undergraduates, the book aims to build up experience by working with spectra from a very early stage. Each section in the book is preceded by a notice of its aims and objective- what the students should be able to do after working through it- and the little prior knowledge required is clearly defined. By the end of the programme the reader should be able to interpret the proton magnetic spectrum of a known substance, and to predict plausible alternative structures from the spectrum of an unknown substance. Like the two previous highly successful Heyden programmed teaching texts, on Gas-Liquid Chromatography by Pattison and Infrared Spectroscopy by Cook and Jones, this programme has been thoroughly validated by over 100 college and industry based students. Its effectiveness as a teaching an a revision text has been well proven prior to publication."- Publisher.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
We present results on the electroexcitation of the low mass resonances Delta(1232)P33, N(1440)P11, N(1520)D13, and N(1535)S11 in a wide range of Q2. The results were obtained in the comprehensive analysis of JLab-CLAS data on differential cross sections, longitudinally polarized beam asymmetries, and longitudinal target and beam-target asymmetries for pion electroproduction off the proton. The data were analysed using two conceptually different approaches, fixed-t dispersion relations and a unitary isobar model, allowing us to draw conclusions on the model sensitivity of the obtained electrocoupling amplitudes. The amplitudes for the Delta(1232)P33} show the importance of a meson-cloud contribution to quantitatively explain the magnetic dipole strength, as well as the electric and scalar quadrupole transitions. They do not show any tendency of approaching the pQCD regime for Q26 GeV2. For the Roper resonance, N(1440)P11, the data provide strong evidence for this state as a predominantly radial excitation of a 3-quark ground state. Measured in pion electroproduction, the transverse helicity amplitude for the N(1535)S11 allowed us to obtain the branching ratios of this state to the piN and etaN channels via comparison to the results extracted from eta electroproduction. The extensive CLAS data also enabled the extraction of the gamma*p - N(1520)D13 and N(1535)S11 longitudinal helicity amplitudes with good precision.
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Author: ![Single Pi [superscript O] Electroproduction Off the Proton in the Resonance Region PDF](https://books.google.com/books/content/images/frontcover/sYOuMwEACAAJ?fife=w80-h100)
Author: Nikolay Markov
Author: ![New Results from the Studies of the [Nu] (1440) 1/2+, [Nu] (1520) 3/2-, and [Delta] (1620) 1/2- Resonances in Exclusive Ep 2!e'p'[pi]+[pi]- Electroproduction with the CLAS Detector PDF](https://books.google.com/books/content/images/frontcover/H0n4twEACAAJ?fife=w80-h100)
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Author: Herbert Funsten
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Author: Edmond John Haws
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