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Neutron yields from 435 MeV/nucleon Nb stopping in Nb and 272 MeV/nucleon Nb stopping in Nb and AlNeutron fluences were measured from 435 MeV/nucleon Nb ions stopping in a Nb target and 272 MeV/nucleon Nb ions stopping in targets of Nb and Al for neutrons above 20 MeV and at laboratory angles between 3 degrees and 80 degrees. The resultant spectra were integrated over angles to produce neutron energy distributions and over energy to produce neutron angular distributions. The total neutron yields for each system were obtained by integrating over the angular distributions. The angular distributions from all three systems are peaked forward, and the energy distributions from all three systems show an appreciable yield of neutrons with velocities greater than the beam velocity. Comparison of the total neutron yields from the two Nb + Nb systems suggests that the average neutron multiplicity decreases with decreasing projectile energy. Comparison of the total yields from the two 272 MeV/nucleon systems suggests that the total yields show the same dependence on projectile and target mass number as do total inclusive neutron cross sections. The data are compared with Boltzmann-Uehling-Uhlenbeck model calculations.
Document ID
20040088616
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Heilbronn, L.
(Lawrence Berkeley National Laboratory Berkeley, CA 94720, United States)
Madey, R.
Elaasar, M.
Htun, M.
Frankel, K.
Gong, W. G.
Anderson, B. D.
Baldwin, A. R.
Jiang, J.
Keane, D.
McMahan, M. A.
Rathbun, W. H.
Scott, A.
Shao, Y.
Watson, J. W.
Westfall, G. D.
Yennello, S.
Zhang, W. M.
Miller, J.
Date Acquired
August 21, 2013
Publication Date
December 1, 1998
Publication Information
Publication: Physical review C: Nuclear physics
Volume: 58
Issue: 6
ISSN: 0556-2813
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Radiation Health
Non-NASA Center

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