Isomeric Cross Section Ratios for 14 Mev Neutron Reactions

Journal Article · Fri Dec 15 00:00:00 EST 1961 · Journal of the Physical Society of Japan

DOI:https://doi.org/10.1143/JPSJ.16.2371· OSTI ID:4820218

Fukuzawa, Fumio

The cross sections for the production of isomeric pairs in the following reactions with 14-Mev neutrons were measured by the activation method using a sandwiched plastic scintillator: As/sup 75/(n p)Ge/sup 75/(25 plus or minus 5 mb), As/sup 75/(n,p)Ge/sup 75m/ (l0 plus or minus 2 mb); Br/sup 81/(n,2n)Br/sup 80/(470 plus or minus 50 mb), Br/sup 81/ (n,2n)Br/sup 80m/ (510 plus or minus 50 mb); Ba/sup 138/(n, alpha )Xe/sup 135/(l3 plus or minus 2 mb), Ba/sup 138/ (n, alpha )Xe/sup 135m/ (13 plus or minus 2 mb); Ho/sup 165/(n,p)Dy/sup 165/(40 plus or minus 10 mb), Hp/sup 165/(n,p)Dy/sup 165m/ (<1 mb). Their isomeric cross section ratios are compared with the statistical model calculations based on the method of angular momentum sampling. For Br/sup 81/(n,2n) and Ba/sup 138/ (n, alpha ) reactions, these ratios can be reproduced by these calculations with the value of the level density parameter sigma = 4 plus or minus 1, but not for the other two. The disagreement in As/sup 75/(n,p) reaction can be explained by the predominance of the direct interaction process.

• Research Organization: Hyogo Univ. of Agriculture, Japan
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-007054
• OSTI ID: 4820218
• Journal Information: Journal of the Physical Society of Japan, Vol. 16, Issue 12; Other Information: Orig. Receipt Date: 31-DEC-62; ISSN 0031-9015
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

PHYSICS
ACTIVATION
ALPHA PARTICLES
ANGULAR MOMENTUM
ARSENIC 75
BARIUM 138
BROMINE 80
BROMINE 81
CROSS SECTIONS
DIFFERENTIAL EQUATIONS
DIRECT REACTIONS
DISTRIBUTION
DYSPROSIUM 165
ENERGY RANGE
ERRORS
GERMANIUM 75
HOLMIUM 165
ISOMERS
MEASURED VALUES
MEV RANGE
MOMENTUM
NEUTRON BEAMS
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUMERICALS
PHOSPHORS
PRODUCTION
PROTONS
RESONANCE
STATISTICS
XENON 135