reciprocal velocity region

reciprocal velocity region

[ri′sip·rə·kəl və′läs·əd·ē ‚rē·jən]
(nuclear physics)
The energy region in which the capture cross section for neutrons by a given element is inversely proportional to neutron velocity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.