Photodisintegration of Helium-3 at Energies Between 200 and 600 MEV. PDF Download
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Author: Kirk Thomas McDonald
Publisher:
ISBN:
Category :
Languages : en
Pages : 362
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Author: Kirk Thomas McDonald
Publisher:
ISBN:
Category :
Languages : en
Pages : 362
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Author: Roland Dobbs
Publisher:
ISBN: 9780198506409
Category : Helium
Languages : en
Pages : 1088
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The condensed phases of helium three provide an exciting laboratory for many fundamental questions in condensed matter physics. Due to its light mass and weak interatomic potential, the condensed phases of helium display quantum effects more dramatically than any other atomic system. Intuitionbased on classical experience is often misleading in these phases: the solid phase for instance is less ordered at low temperature than the liquid phase. The present book is unique in covering all the low temperature properties of helium three as liquid, superfluid, and solid. It provides anintroduction to the extensive literature on helium three from the point of view of an experimentalist, and includes the analogy of its properties with the cosmological 'big bang'. Graduate students, researchers, and professionals in condensed matter physics and low temperature physics will findthis the standard reference work for the decade to come.
Author: Peter Nelson Dezendorf
Publisher:
ISBN:
Category :
Languages : en
Pages : 290
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Author: James Russell Stewart
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Category :
Languages : en
Pages :
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Author: Jack Robert MacDonald
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ISBN:
Category : Helium
Languages : en
Pages : 152
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Author: Norman Reed Kolb
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ISBN:
Category :
Languages : en
Pages : 412
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This experiment measured coincident neutron-proton pairs from the photodisintegration of $sp3$He. The bremsstrahlung photon beam was produced by a 100 MeV electron beam, supplied by the University of Illinois Nuclear Physics Laboratory 100% duty factor electron microtron. The energy and angle of the np pairs were used to reconstruct the energy of the photon, making this a kinematically complete experiment. The $sp3$He($gamma$,np)p data were normalized to measured $sp2$H($gamma$,np) yields and published deuterium photodisintegration cross sections. The target was a cryogenic system which maintained the $sp3$He gas at liquid $sp4$He temperature. Protons were detected with a dE-E scintillation telescope and neutrons with a position sensitive scintillation array. The proton energy was determined from the energy deposited in a NaI crystal and the neutron energy from the time of flight over a 4 m path. The neutron and proton were detected on opposite sides of the photon beam at opening angles from 122-202 degrees in the lab frame. Quasi-deuteron breakup events were detected for photon energies of 45-95 MeV. Strong final state interactions prohibited an accurate determination of the quasi-deuteron contribution to the cross section. The single differential cross section $(dsigma/dOmegasb{p})$ for $sp3$He at $thetasb{p}$ = 81$spcirc$ was determined by integrating the neutron angular distribution. This cross section, relative to deuterium, ranged from 2.39 $pm$.16 at 55 MeV to 1.67 $pm$.27 at 95 MeV.
Author: Lyle Purmal Robertson
Publisher:
ISBN:
Category : Helium
Languages : en
Pages : 280
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Author:
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ISBN:
Category :
Languages : en
Pages :
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![Measurements of the Absolute Cross Section of the Three-body Photodisintegration of Helium-3 Between E[gamma] PDF](https://books.google.com/books/content/images/frontcover/ZopJAQAACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages :
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Measurements of the three-body photodisintegration of 3He were performed at the High Intensity & gamma-ray Source (HI & gammaS). Neutrons emitted in this reaction inside a 3He gas target were detected with seven 12.7 cm diameter liquid scintillator detectors. Time-of-flight (TOF) and pulse-shape discrimination (PSD) techniques were used to identify neutron events. The absolute differential cross sections for the 3He(& gamma, n)pp reaction as a function of outgoing neutron scattering angle and energy were determined from the measurements at the incident & gamma-ray energies of 11.4, 12.8, 13.5, and 14.7 MeV to within a precision better than +/- 6 %. The absolute cross sections at each incident energy are compared to the results of Gorbunov [Gor74], phase space calculations, and state-of-the-art three-body calculations. The inclusion of the Coulomb interaction in the three-body problem has been a long-standing challenge in theoretical nuclear physics. The present experimental data were found to be in good agreement with the state-of-the-art theory, which includes a full treatment of the Coulomb interaction between the protons in the final state [Del05].
Author: Robert Simpson Tickle
Publisher:
ISBN:
Category : Helium
Languages : en
Pages : 122
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