The rotations of FF-angular correlations in strong external magnetic fields were observed in the decay of 5.1 h Sb us and 5"8 d Sb 12~ Values of the gyromagnetic ratios of the 5-two particle states of Sn lls and Sn 1~~ were derived. In the case of 5"t hours Sb 11s the rotation of the 254 keV--t.22t MeV F7-angular correlation in a field of 40950 Gauss was measured as (o L 9 z = 0'417 -1-0'038, and the g-factor of the 5-state was derived asThis value is correct under the assumption that the rotation in the 4 + state is negligible. The half life of this state was found to be T 89 ~< 7 " 10 -1~ sec.In the case of 5"8 d Sb xe~ the rotation of the 200 keV--90 keV Tv-angular correlation in a field of 53200 Gauss was found to be o) L 9 "c ~ 0"150 -4-0"020, and the g-factor of the 5-state was derived as g = --O'O74 4-0.0t0.The evaluation implies a smM1 correction for the Compton-underground of the high energy ~-transitions. It is assumed that the rotation in the 4 + state is negligible. The half life of the 4 + state was found to be T~ ~ 6" I0 -1~ sec.The half lives of the 5-states of Sn ns and Sn 1~~ were determined as and T~ = (2t"7 i 0-2)" ~0-gsec respectively. T6 = (5'53 4-0'06) 9 t0 .9 sec Differential angular correlation measurements proved that attenuations in the 5-states by internal fields were very small for the liquid sources used in these experiments.The results for the gyromagnetic ratios of the 5-states are consistent with tile theoretical interpretation of these levels as mainly (hit/2, s 1/2) two-neutronconfigurations.Magnetische Momente der 5--Niveaus yon Sn ~s und Sn x~~ 37t
The nuclear g-factor of the 2 + rotational state of HI 17s was determined by a measurement of the rotation of the angular correlation between the gamma-group of ~-~ 1350 keV and the 93 keV radiation in an external magnetic field of 49 550 gauss. ']?he result is: g2~ = + 0"356q-0"035.Liquid sources of 21 days W l:s (ammoniumtungstate in aqueous solution) in equilibrium with 9'3 rain Ta l:s have been used for these measurements. Differential angular correlation measurements showed the existence of a strong time dependent attenuation. The observed attenuation parameters are:,~/~ = 0"85 4-0"23 34/), = 0"74 ~ 0-10.The true coefficients of the angular correlation between the gamma-group of ~1350 keV and the 93 keV radiation were derived as:As they are substantially larger than previously published values a reinterpretation of the correlation function is given.The half-life of the 93 keV state was found to be: T{ = (1.49 4-0.05) -10-9 sec in good agreement with the coulomb excitation data.
EinffihrungBeim systematischen Studium der gR-Faktoren der 2+-Rotationsniveaus stark ddormierter Kerne mit Hilfe yon Winkelkorrelationsmessungen schien bisher der Fall Hi avs schwer zug/inglich zu sein. Im Zerfall yon Ta ~Ts tiber Hf 17sin werden die entsprechenden Niveaus wie im Zerfall yon Hf ls~ erreicht, jedoch ist die tVIessung des g-Faktors aus zwei Griinden erheblich erschwert: erstens ist die Energie der E t-Strahlung vom isomeren 8--Niveau zum 8+-Niveau der Rotationsbande etwas
The Quadrupole Moment of the 2.3 MeV Level in 12~Time differential y T-angular correlation measurements have been performed to determine the electric interaction of the 2.3 MeV I= 5-state of 12~ in different polycristalline antimony compounds. A calibration of the field gradient was achieved by M6Bbauerexperiments with the 23.8 keV I= 3/2 + state in 119Sn using identical sources. From the ratio of the measured electric interactions the ratio of the quadrupole moments is deduced as:=2.86 Q(23.8 keY level, I= 3/2 +, 119Sn) (15).
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