Structure of low-lying states of /sup 76/ /sup 78/ /sup 80/ /sup 82/Se deduced from (p vector,p') scattering at 16 MeV
Angular distributions of dsigma/d..cap omega.. and A/sub y/ have been obtained for elastic and inelastic scattering of 16-MeV protons leading to the first two 2/sup +/ states and the lowest excited 0/sup +/, 4/sup +/ and 3/sup -/ levels of /sup 76/ /sup 78/ /sup 80/ /sup 82/Se. Results have been analyzed in the coupled channels framework assuming the Vibrational Model, the Rotation-Vibration Model, the Asymmetric Rotational Model (ARM) and its extension to ..beta..-vibrational states. There is no one model which can describe simultaneously all the data. However, we find from our ARM-based analysis, which provides the best overall description of the even-parity states, evidence for different deformation for the first and second 2/sup +/ states. This suggests shape coexistence phenomena in these nuclei. Also we observe that the nuclear structure of /sup 82/Se seems to be quite different from that of the lighter isotopes studied. We find, too, that the 3/sup -/ levels of /sup 76/ /sup 78/ /sup 80/Se do not behave as simple vibrational octupole states. Nuclear deformations extracted from the present measurements have been compared with those from earlier (n,n') scattering and Coulomb excitation measurements. Finally, the need for complex and/or deformed spin-orbit potentials is discussed. 47 references.
- Research Organization:
- North Carolina Univ., Chapel Hill (USA). Dept. of Physics and Astronomy; Triangle Universities Nuclear Lab., Durham, NC (USA)
- DOE Contract Number:
- AS05-76ER02408
- OSTI ID:
- 5454978
- Report Number(s):
- DOE/ER/02408-217; ORO-2408-217; ON: DE84004053
- Country of Publication:
- United States
- Language:
- English
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
BARYON REACTIONS
BEAMS
CHARGED-PARTICLE REACTIONS
COUPLED CHANNEL THEORY
CROSS SECTIONS
DATA
DEFORMATION
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
HADRON REACTIONS
INELASTIC SCATTERING
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NUCLEAR DEFORMATION
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
POLARIZED BEAMS
PROTON REACTIONS
RADIOISOTOPES
SCATTERING
SELENIUM 76
SELENIUM 76 TARGET
SELENIUM 78
SELENIUM 78 TARGET
SELENIUM 80
SELENIUM 80 TARGET
SELENIUM 82
SELENIUM 82 TARGET
SELENIUM ISOTOPES
STABLE ISOTOPES
TARGETS
THEORETICAL DATA