TWO NEW PROMETHIUM ISOTOPES: CROSS SECTIONS OF SOME SAMARIUM ISOTOPES FOR 14.8-Mev NEUTRONS

Journal Article · Mon Dec 15 04:00:00 EST 1958 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.112.1950· OSTI ID:4282877

Wille, R G; Fink, R W

When highly enriched samples of Sm/sup 152/ and Sm/sup 154/ are irradiated with 14.8-Mev neutrons, activities having half-lives of 8.5 the J-57 engin 0.5 min and 2.5 the J-57 engin 0.5 min are observed. On the basis of yields and cross-bombardments, these are assigned to new isotopes Pm/sup 152/and Pm/sup 154/, respectively. Cross-section measurements at 14.8 Mev for (n,2n), (n,p), and (n, alpha ) reactions of samarium are reported, the experimental values being as follows: Sm/sup 144/ (n'2n), l200 the J-57 engin 500 mb; Sm/ sup 154/ (n, 2n), 1500 the J-57 engin 300mb; Sm/sup 152/(n,p) 3.7 the J-57 engin 0.2 mb; Sm/sup 154 (n,p) 3.5 the J-57 engin 0.2 mb; Sm/sup 152/ (n, alpha ), 10 the J-57 engin 2 mb; and Smt/sup 54/(n, alpha ), 9 the J-57 engin 3 mb. While the (n,2n) cross sections are within an order-ofmagnitude agreement with statistical evaporation theory, the experimental values for the (n,p) and (n, alpha ) cross sections are several orders of magnitude larger than those calculated from statistical evaporation theory based on the compound nucleus medel. (auth)

• Research Organization: Univ. of Arkansas, Fayetteville
• NSA Number: NSA-13-010454
• OSTI ID: 4282877
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 112; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA PARTICLES
COMPOUND NUCLEI
CROSS SECTIONS
ENERGY
ENERGY RANGE
EVAPORATION
EXCITATION
HALF-LIFE
IRRADIATION
MEASURED VALUES
NEUTRON BEAMS
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEI
PHYSICS AND MATHEMATICS
PRODUCTION
PROMETHIUM 152
PROMETHIUM 154
PROMETHIUM ISOTOPES
PROTONS
RADIOACTIVITY
SAMARIUM 152
SAMARIUM 154
SAMARIUM ISOTOPES
STATISTICS