Evidence for Low-Momentum-Transfer Process in K⁴¹ (α, n )Sc ^44m,g Reactions from Range Measurements of Products

Journal Article · Wed Mar 01 04:00:00 EST 1961 · Canadian Journal of Chemistry

DOI:https://doi.org/10.1139/v61-084· OSTI ID:4066231

Matsuo, Taku; Sugihara, T. T.

Average forward ranges were measured for the product nuclides Sc/sup 43/ , Sc/sup 44m/, and Sc/sup 44g/ as produced in t he reactions K/sup 41/( alpha ,xn) with alpha particles in the energy region 23 to 39 Mev. These ranges, which were determined by a thick target-thick catcher technique, indicated that the ( alpha ,n)produced isomers were formed in part by a low-momentumtransfer process above 30 Mev, its contribution being larger for the ground-state nuclide Sc/sup 44g/. From a thick target-thin catcher experiment at 40 Mev, it was found that the range distribution for Sc/sup 43/ is that expected for a compound-nucleus reaction. Normalizing the Sc/sup 44m/ and Sc/sup 44g/ activity distributions to that of Sc/sup 43/ for the catcher s farthest from the target, lower limits were estimated for the contribution of a direct-reaction low-momentumtransfer process to the formation of Sc/sup 44m/ and Sc/sup 44g/ at 40 Mev to be about 30 and 45%, respectively.

• Research Organization: Clark Univ., Worcester, Mass.
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-013688
• OSTI ID: 4066231
• Journal Information: Canadian Journal of Chemistry, Journal Name: Canadian Journal of Chemistry Journal Issue: 3 Vol. 39; ISSN 0008-4042
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
ALPHA BEAMS
ALPHA PARTICLES
COMPOUND NUCLEI
DIRECT REACTIONS
DISTRIBUTION
ENERGY
ENERGY RANGE
EXCITATION
INTERACTIONS
ISOMERS
MEASURED VALUES
MOMENTUM
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
PHYSICS
POTASSIUM 41
RADIOACTIVITY
SCANDIUM 43
SCANDIUM 44
SLOWDOWN
TARGETS
THICKNESS