New Neutron Facilities for Nuclear Data Measurements at En > 10 MeV View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1992

AUTHORS

H. Condé , R. Haight , H. Klein , P. Lisowski

ABSTRACT

A variety of neutron sources producing “monoenergetic” neutrons of up to 200 MeV in energy and “white” spectral distributions up to 800 MeV is described in this paper. The H(t,n)3He reaction can be employed at LAHL as the ideal monoenergetic neutron source for energies En < 14 MeV because a triton beam with energies of up to 22 MeV is available on an FN tandem. A rotating, high-pressure hydrogen gas target allows high intensity neutron fields to be produced which are well-suited for studying the neutron-induced activation of long-lived isotopes. At PTB, the D(d,n)3He reaction must still be used for the same purpose because any radiation hazard which may be caused by the handling of tritium must be avoided. However, the unavoidable contribution of low-energy neutrons due to deuteron breakup reactions must be corrected for. For this purpose, the spectral fluence has been determined for projectile energies of up to 13.3 MeV and neutron emission angles of up to 15 degrees, which are occasionally taken into account in close-geometry irradiations. At the The Svedberg Laboratory in Uppsala the upgraded cyclotron is now equipped with a thin 7Li target in order to produce a “monoenergetic” neutron beam with energies from 50 to 200 MeV, well collimated to a solid angle of about 10−4 sr. A highly efficient recoil proton spectrometer allows the primary spectral neutron fluence to be reconstructed and other (n,p) reactions to be investigated for isovector excitations. At LANL a spallation neutron source is now available at Target-4 of the WHR facility. Part of the 800 MeV proton beam from LAMPF is chopped and bunched to provide 40 macropulses/s and a total of 32000 micropulses/s with a time width of 150 ps and a separation of > 1 microsecond. Seven beam lines with flight paths between 7 and 90 m (350 m is aimed at) are available at angles of 15 to 90 degrees to the incident proton beam. The spectral distributions differ for these production angles and allow low or high energy ranges to be emphasized. Neutron-induced charged particle and photon production and fission have already been investigated. More... »

PAGES

386-394

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-3-642-58113-7_112

DOI

http://dx.doi.org/10.1007/978-3-642-58113-7_112

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1002817497


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