Electro-pion Production from Proton, Deuteron, and Helium-3 PDF Download
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Author: Roger Jay Loucks Publisher: ISBN: Category : Languages : en Pages :
Book Description
The cross section for the $p(e,espprimepisp+)n, d(e,espprimepisp+)2n$ and $sp3He(e,espprimepisp+)sp3H$ reactions are calculated using a simple model with pion, nucleon and $Delta$-resonance degrees of freedom for the kinematical conditions used in a recent Saclay experiment. For the $d(e,espprimepisp+)2n$ reaction, final state interactions between the two outgoing neutrons are found to have a large effect. The calculated quenching of the $pisp+$ production cross section for the deuterium target is in agreement with that observed experimentally. It is predicted that due to the strong final state interactions in the singlet S state of the two neutrons, the $d(e,espprimepisp+)2n$ cross section can have a large dependence on the orientation of the deuteron spin. For the $sp3He(e,espprimepisp+)sp3H$ reaction, the quenching is predicted to be $sim$0.4 which is in agreement with the unpublished results of the Mainz experiment. The four important contributions to the quenching are identified as: (i) the finite size i.e., the form factor of the trinucleons, (ii) the spin-isospin correlations in the trinucleons, (iii) the finite range of the propagation of the struck proton, and (iv) the possible pion-nucleon final state interactions.
Author: Roger Jay Loucks Publisher: ISBN: Category : Languages : en Pages :
Book Description
The cross section for the $p(e,espprimepisp+)n, d(e,espprimepisp+)2n$ and $sp3He(e,espprimepisp+)sp3H$ reactions are calculated using a simple model with pion, nucleon and $Delta$-resonance degrees of freedom for the kinematical conditions used in a recent Saclay experiment. For the $d(e,espprimepisp+)2n$ reaction, final state interactions between the two outgoing neutrons are found to have a large effect. The calculated quenching of the $pisp+$ production cross section for the deuterium target is in agreement with that observed experimentally. It is predicted that due to the strong final state interactions in the singlet S state of the two neutrons, the $d(e,espprimepisp+)2n$ cross section can have a large dependence on the orientation of the deuteron spin. For the $sp3He(e,espprimepisp+)sp3H$ reaction, the quenching is predicted to be $sim$0.4 which is in agreement with the unpublished results of the Mainz experiment. The four important contributions to the quenching are identified as: (i) the finite size i.e., the form factor of the trinucleons, (ii) the spin-isospin correlations in the trinucleons, (iii) the finite range of the propagation of the struck proton, and (iv) the possible pion-nucleon final state interactions.
Author: David J. Gaskell Publisher: ISBN: Category : Pion production Languages : en Pages : 482
Book Description
Conventional pictures of nuclear interactions, in which the pion mediates the long/medium range part of the nuclear force, predict an enhancement of the virtual pion cloud in nuclei relative to that in the free nucleon. Jefferson Lab Experiment E91003 measured charged pion electroproduction from Hydrogen, Deuterium, and Helium-3. The longitudinal cross section, which in the limit of pole dominance can be viewed as the quasifree knockout of a virtual pion, was extracted via a Rosenbluth separation. The longitudinal cross sections from Deuterium and Helium-3 were compared to Hydrogen to look for signatures of the nuclear pions.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A series of measurements for pion electroproduction from helium-3, deuterium, and hydrogen were completed at the Thomas Jefferson National Accelerator Facility by the NucPi Collaboration. E91003 began taking data in February 1998 and was completed in April 1998. The longitudinal and transverse parts of the differential cross section were extracted, by means of a Rosenbluth type separation, in the direction parallel to the virtual photon, at Q 2 = 0.4 GeV 2, for W = 1.15 and W = 1.6 GeV. The mass dependence of the longitudinal cross section should provide insight into the surprising apparent absence of any significant cross section enhancement due to excess pions in the nuclear medium.
Author: Peterson's Publisher: Peterson's ISBN: 0768934567 Category : Study Aids Languages : en Pages : 1166
Book Description
Peterson's Graduate Programs in the Physical Sciences contains a wealth of information on colleges and universities that offer graduate work in Astronomy and Astrophysics, Chemistry, Geosciences, Marine Sciences and Oceanography, Meteorology and Atmospheric Sciences, and Physics. The institutions listed include those in the United States, Canada, and abroad that are accredited by U.S. accrediting bodies. Up-to-date information, collected through Peterson's Annual Survey of Graduate and Professional Institutions, provides valuable information on degree offerings, professional accreditation, jointly offered degrees, part-time and evening/weekend programs, postbaccalaureate distance degrees, faculty, students, degree requirements, entrance requirements, expenses, financial support, faculty research, and unit head and application contact information. As an added bonus, readers will find a helpful "See Close-Up" link to in-depth program descriptions written by some of these institutions. These Close-Ups offer detailed information about the physical sciences program, faculty members and their research, and links to the program or department's Web site. In addition, there are valuable articles on financial assistance and support at the graduate level and the graduate admissions process, with special advice for international and minority students. Another article discusses important facts about accreditation and provides a current list of accrediting agencies.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Semi-inclusive electroproduction of all three pion flavors (pi^+, pi^-, pi^0) from both deuteron and proton targets is measured for Q^2> 1.1 GeV^2, 0.12 x
Author: Roger Jay Loucks
Author: Roger Jay Loucks
Author: David J. Gaskell
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Author: Gerald G. Ohlsen
Author: Peterson's
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Author: Andrzej Deloff
Author: Thomas Joseph McMahon
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