GAMMA RADIATIONS FROM EXCITED STATES OF N$sup 16$, O$sup 19$, AND Ne$sup 1$$sup 9$

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1963

OSTI ID:4005065

Givens, W W

A magnetic-lens spectrometer was used to study the lowenergy gamma rays and internal conversion electrons errutted from excited states in /sup 16/N, /sup 19/O, and /sup 19/Ne. /sup 16/N was prod uced in the reaction /sup 15/ N(d,p)/sup 16/N. The photoelectron spectra using Cd and Au radiators suggest low- energy gamma rays from excited states in /sup 16/N having energes of 397.3 plus or minus 1.0, 296.2 plus or minus ternal-internal'' conversion method was used to measure the K internal-conversion coefficient for the 120 kev transition in /sup 16/N. The value alpha /sub kappa / = (7.23 plus or minus 1.42) x 10/ sup -3/ for the 120 kev transition indicates an E2 transition, which is consistent with the present spin and parity assignments. The gamma -ray branching for individual levels in /sup 16/N was also measured. 190 was produced in the reaction /sup 18/O(d,p)/sup 19/O. The energy of the first-excited level in /sup 19/O was determined from both the internal conversion and photoelectron spectra to be 95 plus or minus 2 kev. The K internal-conversion coefficient for the 95 kev first-excited to ground state transition in /sup 19/O was measured to be (6.27 plus or minus 1.13) x 10/sup -4/. This value implies M1 radiation. Therefore the possibility of the first-excited level of /sup 19/O having negative parity was eliminated. /sup 19/Ne was produced in the reaction /sup 19/F(p,n)/ sup 19/Ne. Relative intensity measurements of the internal conversion electrons and, separately, of the gamma rays enutted from the first two excited states in /sup 19/Ne confirm the fact that the first-excited 241 kev level in /sup 19/Ne has a higher angular momentum than the secondexcited 271 kev level. Therefore, the spins of the first two excited states are reversed in the mirror nuclei /sup 19/Ne and /sup 19/F. The energy of the first-excited level in /sup 19/Ne was measured to be 241 plus or minus 4 kev, and the energy of the secondexcited level was measured to be 271 plus or minus 4 kev, which is about 10 kev lower than the energy indicated by neutron threshold methods. (Dissertation Abstr., 24: No, 8, Feb.

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-18-021352
• OSTI ID: 4005065
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
CADMIUM
CONFIGURATION
DEUTERON BEAMS
ELECTRONS
ENERGY LEVELS
FLUORINE 19
GAMMA RADIATION
GOLD
INTERNAL CONVERSION
LENSES
MAGNETIC FIELDS
MEASURED VALUES
MOMENTUM
NEON 19
NEUTRONS
NITROGEN 15
NITROGEN 16
NUCLEAR MODELS
NUCLEAR REACTIONS
OXYGEN 18
OXYGEN 19
PARITY
PHOTOPRODUCTION
PHYSICS
PROTON BEAMS
PROTONS
RADIATION SOURCES
SPECTRA
SPECTROMETERS
SPIN