rotation-aligned configurations. The systematics of the B(E2) values within the semidecoupled negative paraity bands is discussed. An attempt has been made to measure the half-life of the 7-level in ~sspt. The still existing inconsistences are briefly discussed.

The exteraal and internal conversion spectra in the deeay of Zr95--iNTb 9a were measured in a double focusing beta spectrometer. Applying the eorrection for the anisotropie distribution of the photoelectroas ejected from a uranium convertor it was possible to determine aceurately the relative gamma ray intensities of. the 237, 726 and 757 keV transitions in Nb 9a, and the 762 and 765 keV transitions in Mo 9~. Applying the internal-external eonversion method, the absolute k-conversion coefficients were determined for the above transitions. The 237 keV transition was found to be M a transition and the 726 keV transition is M~ transition, while the 7 + other ones ate M 1 of E 2 transitions. The spin of the leve! at 726 keV in Nb 9~ has value of -~ . l. IntroductionA long lived radioactivity in zirconium was produced asa fission product from uranium and was first obtained in 1940 by A. GOSSE and F. FOOTH [1]. SAGA~E et al. [2] found that the half life of the activity was 63 days and associated it with the isotope of mass 93. Subsequent investigations have shown that the activity is more likely in Zr 95 which decays to the radioactive daughter product NbgL In 1953 CORK et al. [3] used a semicircular magnetic spectrometer for the study of the beta and gamma radiations and the half life of the decay. They found that Zr 9s emits three beta rays of energies 910, 405 and 360 keV with hall life of 65,2 days, each followed by a gamma transition leading to radioactive Nb 95. The gamma energies determined by CORK were 235, 725 and 758 keV. The Nb 95 decays by 165 keV endpoint energy beta transition into Mo 95 with accompanying gamma energies of 753 and 768 keV. MITTELMAN [4] studied the Zr 95 spectra with a double focusing beta ray 5* Acta Physica Academiae Scientiarum Hungaricae 23, 1967