C$sup 13$(p,$gamma$)N$sup 14$ 1.47- AND 2.11-MEV RESONANCES AND THE ODD- PARITY LEVELS OF MASS 14

Journal Article · Tue Mar 31 23:00:00 EST 1959 · Physical Review (U.S.) Superseded in part by Phys.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.114.214· OSTI ID:4232071

Warburton, E K; Rose, H J; Hatch, E N

A study has been made of the gamma rays emitted by the 8.9- and 9.5- Mev levels of N /sup 14/ using the C/sup 13/(p, gamma )N/sup 14/ reaction at the 1.47- and 2.11-Mev resonances. The decay schemes of these levels were reinvestigated using a three-crystal pair spectrometer, NaI(T1) singlecrystal measurements, and standard gamma - gamma coincidence techniques. The anisotropies relative to the bombarding beam of most of the observed gamma transitions were measured using the three-crystal pair spectrometer. The angular distributions of some of the gamma transitions were measured using a single NaI(T1) crystal. Measurements were made of the Doppler shifts of the ground state decay of the N/sup 14/ 5.10-Mev level and the cascade from the N/sup 14/ 5.83-Mev level to the N/sup 14/ 5.10-Mev level. From these Doppler shift measurements the mean lifetime of the N/sup 14/ 5.53-Mev level was found to be in the range (5-65) x 10/sup -14/ sec; while an upper limit of 3 x 10/sup -13/ sec was set on the mean life of the N/sup 14/ 5.10-Mev level. The results of the study of the gamma decay of the N/sup 14/ 9.5- and 8.9-Mev levels combined with the results of earlier measurements give conclusive assignments of 2/sup -/, 3/ sup -/, 3, and 2 for the N/sup 14/ levels at 9.50, 8.90, 5.83, and 5.10 Mev. The 5.83-Mev level most probably has odd parity. A tentative assignment of J = 2 is given to the N/sup 14/ 7.02-Mev level. Evidence is presented, from this and previous investigations, that indicates the N/sup 14/ 8.06-, 8.70-, 8.90-, and 9.50-Mev levels arise from the s/sup 4/p/sup 9/2s and s/sup 4/p/sup 9/d corfigurations with the largest contribution being from the (p/sub 1/2 2s/sub 1/2 configuration for the 8.06- and 8.70-Mev levels and from the (p/sub 1/2/d/sub 5/2/ configuration for the 8.90and 9.50-Mev levels. The analogs of these T = 1 levels. in C/sup 14/ are almost certainly the C/sup 14/ 6.09-, 6.89-, 6.72-, and 7.35-Mev levels, respectively. The T = 0, s/sup 4/p/sup 9/2s aad s/sup4/p/sup9/d states of N/sup 14/ are also discussed. It is proposed that the 4.91-, 5.69-, 5.10-, and 5.83-Mev levels of N/sup 14/ are 0/sup -/ and 1/sup -/, s/sup 4/p/sup 9/2s/sub 1/2 and 2/sup -/ and 3/sup -/, s/sup 4/p/sup 9/d/sub 5/2 states, respectively. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.; Princeton Univ., N.J.
• NSA Number: NSA-13-016481
• OSTI ID: 4232071
• 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: 114; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
ANISOTROPY
CARBON 13
CARBON 14
COINCIDENCE METHODS
DECAY
DOPPLER EFFECT
ENERGY LEVELS
ENERGY RANGE
GAMMA RADIATION
GAMMA SPECTROMETERS
HALF-LIFE
MASS
MEASURED VALUES
NITROGEN 14
NUCLEAR REACTIONS
PAIR PRODUCTION
PARITY
PHYSICS AND MATHEMATICS
PROTON BEAMS
PROTONS
RESONANCE
SCINTILLATION COUNTERS
SODIUM IODIDES
SPECTRAL SHIFT
SPIN
THALLIUM
TRANSIENTS