PARITY OF THE 2.13-Mev FIRST EXCITED STATE OF B$sup 1$$sup 1$

Journal Article · Fri Feb 15 04:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

OSTI ID:4723724

Wilkinson, D H; Alburger, D E; Warburton, E K; Pixley, R E

>The positron-electron pair-line spectrum of the 2.13Mev transition in B/ sup 11/ has been measured by means of an intermediate-image pair spectrometer using the reaction B/sup 11/(p,p')B/sup 11*/ at the 2.66-Mev proton resonance. Comparison measurements were made on the pair line of the 3.09Mev E1 transition in the C/sup 12/(d,p)C/sup 13/ reaction at E/sub d/ = 1.7 Mev. Gamma-ray yields from the two reactions were monitored by means of a 5-in. x 5-in. NaI crystal spectrometer. The ratio R = (N/sub pair line//N/sub gamma /)/sub 3.09//(N/sub apir line //N/sub gamma /)/sub 2.13/ was found to be 3.3 plus or minus 0.7. Calculations of the spectrometer pairline efficiency versus transition energy were made for E0, E1 to E4, and M1 to M4 multipoles based on angular correlation formulas of Oppenheimer and of Rose. The values of R derived from the efficiency curves are 1.81, multipolarities, respectively, for the 2.13-Mev B/sup 11/ transition. The experimental result establishes that there is no parity change between the ground and first excited states and therefore that the latter is of odd parity since the ground state of B/sup 11/ is 3/2/sup -/. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-17-011707
• OSTI ID: 4723724
• Report Number(s): BNL-6397; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 129; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

ANGULAR CORRELATION
ANGULAR DISTRIBUTION
BORON 11
CARBON 12
CARBON 13
CRYSTALS
DECAY
DEUTERONS
EFFICIENCY
ELECTRONS
ENERGY
ENERGY LEVELS
EXCITATION
GAMMA RADIATION
MEASURED VALUES
MONITORING
NUCLEAR REACTIONS
NUMERICALS
PAIR PRODUCTION
PARITY
PHYSICS
PROTONS
SPECTRA
SPECTROMETERS
STATISTICS
TRANSITIONS