Intermediate structure in the /sup 238/U neutron capture cross section

Conference · Wed Oct 01 00:00:00 EDT 1975 · Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States)

OSTI ID:7348839

Perez, R B; de Saussure, G

Recent measurements of the /sup 238/U neutron capture cross section show large fluctuations in the unresolved resonance region. To test whether or not the observed long-range fluctuation of the neutron capture represent departures from the compound nuclear model, the Wald-Wolfowitz runs and correlation tests were applied to the /sup 238/U neutron capture data obtained at ORELA. The Wald-Wolfowitz runs test deals with the statistic, R, which is the number of unbroken sequences of data points above or below a given reference line. This statistic is to be compared with the expected value of runs E(R) +- sigma(R) arising from randomly distributed data. In the correlation test we have computed the first serial correlation coefficient of the data as well as its expected value and variance for a set of random data. In both tests one computes the probability, P, for the given statistical entity to depart from its expected value by more than epsilon standard deviations. Both tests confirm the presence of intermediate structure between 5 and 100 keV. The range of the structure far exceeds the width of the experimental resolution and level widths. 3 tables, 2 figures. (auth)

• Research Organization: Oak Ridge National Lab., TN
• OSTI ID: 7348839
• Journal Information: Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States), Vol. 425; Conference: Proceedings on nuclear cross section and technology, Washington, DC, USA, 3 Mar 1975; Other Information: See NBS-SPEC.PUBL.--425(Vol.2); CONF-750303--P2
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
NEUTRON REACTIONS
CAPTURE
URANIUM 238 TARGET
COMPOUND NUCLEI
CROSS SECTIONS
FLUCTUATIONS
URANIUM 239
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
EVEN-ODD NUCLEI
HADRON REACTIONS
HEAVY NUCLEI
ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
RADIOISOTOPES
TARGETS
URANIUM ISOTOPES
VARIATIONS
652025* - Nuclear Properties & Reactions
A=220 & above
Experimental- Nuclear Reactions & Scattering- (-1987)