Singles, coincidence and reduced transition probabilities for {gamma}-rays following the electron capture decay of {sup 152}Eu
- Ein Shams Univ., Cairo (Egypt); and others
The singles gamma ray spectrum of {sup 152}Sm following the {beta}{sup +} decay of {sup 152}Eu has been measured up to an energy of 1800 keV using a 76.11 cm{sup 3} high purity germanium detector and a HPGe-NaI(Tl) [{gamma},{gamma} coincidence spectrometer]. Seventy three gamma-ray transitions have been found due to the decay of {sup 152}Eu to {sup 152}Sm. A new transition at 348.17 keV has been found and fitted in the decay scheme of {sup 152}Eu. The existence of the 239.12 keV gamma-ray transition is confirmed. Positions were proposed for five of the previously weak reported gamma ray transitions at 212.03, 237.06, 683.38, 727.43 and 735.12 keV. The half-life time of the 121.66 keV level was found to be 1.38+0.07ns using the delayed coincidence technique. This was used to determine the experimental absolute reduced transition probability B{sub exp} (E2)=0.686 (70) e{sup 2}b{sup 2} which leads to an enhancement factor of 143 and an intrinsic quadrupole moment of 5.8+0.3b. The quadrupole moment for the 2{sup +} state at 121.66 keV was deduced as 1.66+0.08b with an approximate value for B -the deformation parameter- of {minus}0.25+0.01, assuming a rigid rotation, and the moment of inertia has been estimated to be 0.028x10{sup {minus}52} kg.m{sup 2}. The experimental relative reduced transition probabilities for {gamma}-rays depopulating the 1529.80 and 1757.01 keV levels have been compared with the theoretical values on the basis of the strong coupling rotational model. Accordingly these states are proposed to constitute the 2{sup {minus}} and 3{sup {minus}} members of a new k=2 octupole band.
- OSTI ID:
- 199670
- Report Number(s):
- CONF-941129--
- Country of Publication:
- United States
- Language:
- English
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