MEASUREMENT OF THE "ISOTOPE EFFECT" IN THE NUCLEAR CAPTURE OF NEGATIVE MUONS BY CHLORINE AND INVESTIGATION OF THE VALIDITY OF THE FERMI-TELLER "Z-LAW" IN AgCl. (thesis)

Technical Report · Thu Sep 01 04:00:00 EDT 1960

DOI:https://doi.org/10.2172/4056660· OSTI ID:4056660

Bertram, Jr, W J

Negative muons were used to study some of the interactions of these particles in various materials. Information on the intemotions was obtained by analysis of the time distribution of the electrons resulting from the decay of muons brought to rest in the material. The isotope effect in the nuclear capture of negative muons was studied in separated isotopes of chlorine. The ratio of the capture rates in the two stable isotopes was determined to be lambda /sub c/ (Cl/sup 37/)/ lambda /sub c/(Cl/sup 35/ = 0.694 plus or minus 0.034. This effect is l arger than that of the ratio of 0.782 predicted by the general theory of Primakoff. Studies were also made of the validity of the Fermi-Teller Z-law, which predicts the probability of a negative meson becoming bound to a particular atomic species when the mesons are brought to rest in a chemical compound. These studies indicate that in AgCl, the muons are captured in equal numbers by the Ag and Cl atoms and not in the proportions predicted by the Z-law. The lifetimes of negative muons were measured in Ag, Cl, and F and found to be 91.5 plus or minus 2.3 nsec, 0.437 plus or minus 0.022 mu sec, and 1.217 plus or minus 0.080 mu sec, respectively. (D.J.C.)

• Research Organization: Carnegie Inst. of Tech., Pittsburgh
• NSA Number: NSA-15-015042
• OSTI ID: 4056660
• Report Number(s): NYO-2243
• Country of Publication: United States
• Language: English

Related Subjects

ATOMS
BETA DETECTION
CAPTURE
CHLORINE
CHLORINE 35
CHLORINE 37
COMPOUNDS
DECAY
DISTRIBUTION
EFFICIENCY
ELECTRIC CHARGES
ELECTRONS
FERMI-TELLER THEORY
FLUORINE
HALF-LIFE
INTERACTIONS
ISOTOPE EFFECTS
ISOTOPE SEPARATION
ISOTOPES
MEASURED VALUES
MESONS
MUONS
MUONS-MINUS
NUCLEAR MODELS
NUCLEAR THEORY
NUCLEI
PHYSICS
PRIMAKOFF THEORY
SILVER
SILVER CHLORIDES
SLOWDOWN