States in /sup 20/O by use of /sup 18/O(t,p. gamma. ) measurements

Journal Article · Sun Mar 01 04:00:00 EST 1981 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.23.980· OSTI ID:6633641

Young, Jr, K C; Balamuth, D P; Lind, J M; Zurmuehle, R W

Levels in /sup 20/O populated in the /sup 18/O(t,p)/sup 20/O reaction have been studied at bombarding energies of 10 and 12 MeV using proton-..gamma.. angular correlation measurements in an axially symmetric geometry. Spin assignments have been made to levels at 1.67 MeV (J/sup ..pi../=2/sup +/) and 4.06 MeV (J/sup ..pi../=2/sup +/). The angular correlations measured for levels at E/sub x/=4.45 and 5.38 MeV are consistent with J/sup ..pi../=0/sup +/ for both. The E2/M1 mixing ratio for the 4.06..-->..1.67 MeV transition is measured as delta=-0.18 +- 0.08. Comparison of relative electromagnetic matrix elements (obtained from mixing ratio and branching ratio measurements) with the predictions of shell model calculations suggests that excitations out of the 1p shell play a role in describing these transitions. The population parameters measured for the (t,p) reaction leading to the first excited states of /sup 18/O and /sup 20/O show that at E/sub t/=12 MeV the reaction mechanism is predominantly direct.

• Research Organization: Physics Department, University of Pennsylvania, Philadelphia, Pennsylvania 19104
• OSTI ID: 6633641
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 23:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BRANCHING RATIO
CHARGED-PARTICLE REACTIONS
CORRELATIONS
DATA
DIRECT REACTIONS
E2-TRANSITIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FERMIONS
HADRONS
INFORMATION
ISOTOPES
LIGHT NUCLEI
M1-TRANSITIONS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MULTI-NUCLEON TRANSFER REACTIONS
MULTIPOLE TRANSITIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
OXYGEN 18 TARGET
OXYGEN 20
OXYGEN ISOTOPES
PARTICLE PROPERTIES
PROTONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
SPIN
TARGETS
TRANSFER REACTIONS
TRITON REACTIONS
TWO-NUCLEON TRANSFER REACTIONS