Evidence for superdeformed shape isomeric states in [sup 28]Si at excitations above 40 MeV through observations of selective particle decays of [sup 16]O+[sup 12]C resonances in [sup 8]Be and alpha channels

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.1418· OSTI ID:6643332

Eswaran, M A; Kumar, S; Mirgule, E T; Chakrabarty, D R; Datar, V M; Ragoowansi, N L; Pal, U K ^[1]

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1. Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay 400 085 (India)

Excitation functions of the reactions [sup 12]C([sup 16]O,[sup 8]Be)[sup 20]Ne and [sup 12]C([sup 16]O,[sup 4]He)[sup 24]Mg leading to several states have been measured in the range [ital E][sub c.m.]=25.7--38.6 MeV. From cross channel correlation analysis two intermediate resonance structures at [ital E][sub c.m.]=26.9 and 29.5 MeV corresponding to excitation energies of 43.7 and 46.2 MeV in [sup 28]Si have been identified. Angular distribution measurements for [sup 12]C([sup 16]O,[sup 4]He)[sup 24]Mg[sub g.s.] have also been made at the lower resonance at [ital E][sub c.m.]=26.9 MeV which enable spin assignment of [ital J][sup [pi]]=14[sup +] to this resonance. Striking observation of preferential [sup 8]Be decay of both the resonances to the 8-particle--4-hole states in [sup 20]Ne is interpreted as evidence for the resonances to be highly deformed shape isomeric configurations in [sup 28]Si expected from deformed shell-model calculations.

• OSTI ID: 6643332
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:4; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BERYLLIUM 8
BERYLLIUM ISOTOPES
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DEFORMED NUCLEI
DISTRIBUTION
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
FUNCTIONS
HEAVY ION REACTIONS
HELIUM 4
HELIUM ISOTOPES
ISOMERIC NUCLEI
ISOTOPES
LIGHT NUCLEI
MEV RANGE
MEV RANGE 10-100
NEON 20
NEON ISOTOPES
NUCLEAR REACTIONS
NUCLEI
OXYGEN 16 REACTIONS
PARITY
PARTICLE PROPERTIES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILICON 28
SILICON ISOTOPES
SPIN
STABLE ISOTOPES
TARGETS