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NUCLEAR STRUCTURE OF $sub 50$Sn$sup 12$$sup 0$

Journal Article · · Physical Review (U.S.) Superseded in part by Phys.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
The radiations from 5.8-day Sb/sup 120//sup m/ were investigated in detail, using sector type double-focusing magnetic spectrometers and scintillation counters. The following measurements were made: coincident gamma - ray spectra, directional correlations of l.18-Mev gamma -l.03-Mev gamma , 1.03- Mev gamma 0.20-Mev gamma , 1.18-Mev gamma -0.20-Mev gamma , 0.20-Mev gamma - 0.09Mev gamma , 0.20-Mev Ke/sup -/-0.09-Mev gamma and 0.20-Mev gamma -0.09Mev Ke/sup -/. The 1.18-Mev gamma -1.03-Mev gamma polarization direction correlation, the conversion electron spectra, and the mean lives of the 2.41- and 2.50-Mev levels were also investigated. The decay scheme of 5.8-day Sb/sup 120// sup m/ proposed by McGinnis, which gives the following assignments to the excited states in Sn/sup 120/, 1.18 Mev(2+), 2.21 Mev(4+), 2.41 Mev(6+), and 2.50 Mev (7- ), was confirmed uniquely. These levels were interpreted as arising from the neutron configuations (2d/sub 3/>i)/sup 2/(1h/sub 1/2>i)/sup 2/ and(2d/sub 3/>i)/ sup 3/( 1h/sub 1/2>i)/sup 1/. The lifetimes of the 2.41-, 1.l8-, and probably 2.2l-Mev levels are shorter by a factor 3 to 4 than those expected for single- proton transitions and may be explained by the neutron transition, assuming a somewhat larger effective charge of neutron in spherical and nuclei. The high forbiddenness of the 0.09-Mev El + M2 transition is ascribable to the simultaneous j- and 1-forbidden transition between the states involving (2d/sub 3/ >i)/sup 3/(1h/sub 1/2>i)/sup 1/dand (2d/sub 3/>i)/sup 2/ s(1h/sub 1/2>i)/sup 2/ coufigurations. No appreciable effects of the nuclear finite size or any nuclear structure dependence on the internal conversion process were detected even for the highly forbidden 0.09-Mev E1 + M2 transition. In the decay of 16-min Sb/sub 120/, the l.18-Mev gamma ray was detected. However, other gamma rays expected from the second-level multiplet, which is a characteristic feature of the vibrational model, were not found. (auth)
Research Organization:
Tokyo Univ.
NSA Number:
NSA-15-006838
OSTI ID:
4120948
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Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 120; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ANGULAR DISTRIBUTION
ANTIMONY 120
COINCIDENCE METHODS
CONVERSION
DECAY
ELECTRONS
ENERGY LEVELS
EXCITATION
GAMMA RADIATION
INTERNAL CONVERSION
ISOMERS
LIFETIME
MAGNETIC FIELDS
MEASURED VALUES
NUCLEAR MODELS
PHYSICS
POLARIZATION
QUANTUM MECHANICS
SELECTION RULES
SPECTRA
SPECTROMETERS
SPIN
TIN 120
TRANSIENTS