A Study of the Decay Scheme of Eu¹⁴⁶

? + ratio and?-delayed?-decay of146Eu

“…This finding is in agreement with other recent experiments [1]. We like to mention that the QEc-values derived from the light-ion reaction study [3] and from earlier /?+-endpoint measurements [15,16] are slightly deviating from an evaluation of the 146Eu-mass within a spherical shell model [17].…”

“…Here we have used the experimental angular correlation functions of Singh et al [8] being modified to the present geometry [12]. It turned out that the measured number N634 had to be raised, which is respected by A=0.879 (17), and the measured number Nvgv had to be lowered by applying A= 1.156 (16). Further, the summing S of cascading 7-rays was respected taking into account the total detection efficiencies for cascading quanta, yielding in both evaluations S = 1.009 (1).…”

“…The relative detection efficieneies of the y-rays being close in energy are accurate to 2%. From two independent experiments the experimental ratios Nsl,/N634=O.0399 (16) and N511/N747=O.0326 (13) were derived. The correction C = H. F. A-S is respecting firstly an additional feeding of the 2046 keV state…”

“…+ =51.1(32). For the other, the adjusted QEc-value of Wapstra et al [14] which is based on /?+-endpoint measurements [15,16] and which yields the respective positron endpoint energy of 810 (8) keV, is giving spectively, can be added to a recent compilation of these values [1] given as a function of Z. The present result for Z= 63 not being in support of an earlier reported substantial decrease of the double ratio at medium and at high atomic numbers.…”

Half-life and ?-ray energy of146Sm

“…By irradiation of 15 mg of 14VSm203, enriched to 96.4%, with 345 gAh of 25 MeV deuterons of the G6ttingen cyclotron, 1r were produced and chemically separated from the bulk of samarium using ion-exchange technique [15]. During the two-hour extraction, six europium fractions were taken from the column and their relative activities measured.…”