LEVEL STRUCTURE OF Sn$sup 118$ AND Sn$sup 120$ FROM THE DECAY OF Sb ISOTOPES

Journal Article · Sun Oct 01 04:00:00 EDT 1961 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

OSTI ID:4837466

Bolotin, H H; Li, A C; Schwarzschild, A

The decay of 5-hr Sb/sup 118/ and 6-day Sb/sup 120/ was studied. The spins, parities, and multipole orders of the transitions in both Sn isotopes are characterized by 7-- (E2)5-- (El)4+ (E2)2+ (E2)0+. Level ordering in both isotopes was determined to differ from the previously accepted order. The spins and multipole order assignments were determined from angular correlation and ~ternal conversion measurements in Sn/sup 118/ and from a reinterpretation of simllar experimental results by lkegami for Sn/sup 1/2/sup 0/. All beta decay is directly to the 7-- states. The levels are at 2.57, 2.32 2.28, and 1.23 Mev in Sn/sup 118/ and 2.50, 2.30, 2.21 and 1.18 Mev in Sn/sup 120/. Half lives determined using delayed coincidence techniques were as follows: (7-2), (2.3 = 0.1) x 10/sup -7/ sec; (5-), (2.0 plus or minus 0.3) x 10/sup -8/ sec in Sn/ sup 118/; and (7-), (1.12 plus or minus 0.10) x 10/sup -5/ sec; (5-), (5.2 plus or minus 0.4) x 10/sup -8/ sec in Sn/sup 120/. Reduced transition probabilities are compared with current theories. No crossover transitions were found in either decay except for a weak 1.090-Mev- E3 transition from the 5- to 2+ levels in Sn/sup 118/, which has a reduced transition probability close to single-particle speed. Triple coincidence experiments determined a beta /sup +/ to capture ratio of (1.6 plus or minus 0.1) x 10/sup -3/ in the Sb/sup 118/ decay yelding an inferr ed transition energy of 1.32 Mev. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• NSA Number: NSA-15-032776
• OSTI ID: 4837466
• Report Number(s): BNL-5514; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 124; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
ANTIMONY 118
ANTIMONY 120
BETA DECAY
CAPTURE
COINCIDENCE METHODS
DIPOLES
ELECTRIC FIELDS
ELECTRONS
ENERGY LEVELS
ENERGY RANGE
GAMMA RADIATION
HALF-LIFE
INTERNAL CONVERSION
MEASURED VALUES
MEV RANGE
MULTIPOLARITY
MULTIPOLE RADIATION
NUCLEAR REACTIONS
OCTUPOLES
PARITY
PHYSICS
POSITRONS
QUADRUPOLES
RADIATIONS
SPIN
TIN 118
TIN 120
TRANSIENTS