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COULOMB EXCITATION OF LEVELS IN Se$sup 7$$sup 7$

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
; ;
An investigation was made of the gamma rays which deexcite levels of Se/ sup 77/ that have been Coulomb excited by means of variable-energy alpha particles (2.1 to 8.0 Mev). The energies (in kev), spins and parities, and B(E2)ex's (in units of e/sup 2/ cm/sup 4/ x 10/sup -50/) found for the levels are: 242 plus or minus 2, 3/2-,and 18.2 plus or minus 1.6; 248 plus or minus 5, 5/2-, and 0.37 plus or minus 0.09;440 plus or minus 4, 5/2- and 25.9 plus or minus 1.7; and 515 plus or minus 8, 3/2-, and 1.0 plus or minus 0.2. New evidence for the two close-lying levels at 242 and 248 kev was provided by coincidence studies. A comparison of the B(E2)/sub ex/'s to the B(E2)/sub sp/ suggests that the 242- and 440-kev levels result from collective excitations of the groundstate configuration, and that the 248- and 515-kev levels result from changes in the ground-state configuration. Besides the ground-state transitions from these Coulombexcited levels, gamma rays with energies of 87, 161, 203, and 283 kev were observed. Excitation curves of the 87and 161-kev transitions indicate that they cascade from the 248-kev level. From the measurements of the gamma-ray angular distributions, values for (E2/M1)/sup 1/2 of 0.18 plus or minus 0.03 and 0.05 plus or minus 0.03 were obtained, respectively, for the 242kev gamma ray and for the 203-kev gamma ray, which originates at the 440-kev level. (auth)
Research Organization:
Oak Ridge National Lab., Tenn.
NSA Number:
NSA-16-014011
OSTI ID:
4801883
Journal Information:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 125; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ANGULAR DISTRIBUTION
CHARGED PARTICLES
COULOMB EXCITATION
ELECTRIC FIELDS
EXCITATION
GAMMA RADIATION
LEVELS
MEASURED VALUES
NUCLEI
PHYSICS
SELENIUM 77