Alpha-particle doorway states in /sup 28/Si

Journal Article · Tue Apr 01 04:00:00 EST 1980 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.21.1387· OSTI ID:5410189

Katori, K; Furuno, K; Ooi, T; Hanashima, S

Excitation functions for the /sup 12/C(/sup 16/O,/sup 12/C/sub g.s./)/sup 16/O reaction feeding the 0/sup +/,6.049-, 3/sup -/,6.131-, 2/sup +/,6.919-, 1/sup -/,7.117-, 4/sup +/,10.353-, and 4/sup +/,11.095-MeV states of /sup 16/O have been measured at theta/sub lab/=7.0/sup 0/ over the energy range 22.7 < or = E/sub c.m./ < or = 37.7 MeV in 86- or 173-keV steps. The Ericson-fluctuation type analysis was performed and nonfluctuating enhancements with a width of 700 keV are observed at E/sub c.m./=23.6, 24.6, 28.4, and 32.2 MeV for the 0/sup +/,6.049-MeV states. The most probable total spins for the lowest three states are assigned to be J/sup ..pi../=14/sup +/, 14/sup +/, and 15/sup -/, respectively. These enhancements are strongly correlated to those for the 2/sup +/,6.919-MeV state, but anticorrelated to those for the 3/sup -/,6.131-MeV state. Model calculations based on Hauser-Feshbach and band-crossing theories were performed and none of them have succeeded to reproduce the data in a consistent way. Alpha-particle doorway states embedded in the high excitation of /sup 28/Si (39--54 MeV) are indicative to describe these intermediate-structure resonances.

• Research Organization: Institute of Physics and Tandem Accelerator Center, The University of Tsukuba, Ibaraki 300-31, Japan
• OSTI ID: 5410189
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA-TRANSFER REACTIONS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIRECT REACTIONS
DISTRIBUTION
EIGENSTATES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
FOUR-NUCLEON TRANSFER REACTIONS
HAUSER-FESHBACH THEORY
HEAVY ION REACTIONS
ISOTOPES
LIGHT NUCLEI
MEV RANGE
MEV RANGE 10-100
MULTI-NUCLEON TRANSFER REACTIONS
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEI
OXYGEN 16
OXYGEN 16 REACTIONS
OXYGEN ISOTOPES
PARITY
PARTICLE PROPERTIES
SILICON 28
SILICON ISOTOPES
SPIN
STABLE ISOTOPES
TARGETS
TRANSFER REACTIONS