Abstract
The nuclearg-factor of the 2·083 MeV-state of Ce140 has been determined as:g=1·11±0·04
This value suggests the interpretation of the level as the (g7/2,d5/2)4 two proton shell model configuration.
The investigation implies an integral measurement as well as a time dependent differential measurement (spin rotation method) of the rotation of the 329 keV-487 keVγγ-angular correlation in strong external magnetic fields. Liquid sources of lanthanum nitrate solved in 3n HNO3 were used in these experiments. Some cerium (IV)nitrate was added to make sure that the 4f;-electronic shell remained empty after theβ −-decay. This prevented paramagnetic effects.
Additional runs were performed without adding cerium (IV)nitrate and finally by using liquid sources of lanthanum chloride solved in 2n HCl with some iron (II)-chloride added. It was expected that the Fe++ ions would reduce the primarily formed Ce++++ ions into the Ce+++ state. The Ce+++ shell is paramagnetic and enlarges the effective magnetic field at the position of the nucleus by about 36%. As no definitely faster rotation could be observed, one has to conclude that the ion reaction Ce+++++Fe++⇒Ce++++Fe+++ takes more than about 10−8s.
The half life of the 2·083 MeV state has been redeterminded asT 1/2=(3·41±0·04)·10−9s.
Differential measurements of the angular correlation of the 329 keV-487 keV cascade as a function of the time delay showed that perturbations by internal fields were very small. The coefficientsA 2 andA 4 of the angular correlation and the attenuation parameterλ 2 were determined from measurements with sources of the first type as:A 2=−0·105±0·003A 4=−0·001±0·002 andλ 2=(0·0065±0·0040)·109S−1=(0·032±0·020)·λ
A comparison with the theoretical coefficients of a (3-4-2)-cascade shows that the multipolarity of the 329 keV radiation is a mixture of 99·83%M1 and (0·17±0·03) %E2.
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Wir danken Herrn Professor W.Jentschke für sein besonderes Interesse an unseren Messungen und die stetige Förderung unserer Arbeitsgruppe.
Die chemischen Arbeiten führte Herr Dr. A.Roggenbuck durch. An den langwierigen Messungen und numerischen Auswertungen waren beteiligt:
Frau A.Seemann, Fräulein E.Schwarz, Fräulein L.Mayer, Herr J.Braunsfurth, Herr W.Krull, Herr P.Steiner und Herr J.Heisenberg.
Wir danken FräuleinAlice Maciel, Universidade do Rio Grande do SuI, Brasilien, für ihre Mitarbeit während ihres Gastaufenthalts an unserem Institut im Juli 1962.
Die Bestrahlung der zahlreichen Proben wurden von der Gesellschaft für Kernenergieverwertung in Geesthacht durchgeführt.
Das Bundesministerium für Atomkernenergie förderte diese Untersuchung durch Bereitstellung finanzieller Mittel.
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Körner, H.J., Gerdau, E., Günther, C. et al. Das magnetische Moment des 2,083 MeV-Zwei-Protonen-Niveaus des gerade-gerade-Kerns Ce140 . Z. Physik 173, 203–220 (1963). https://doi.org/10.1007/BF01377960
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DOI: https://doi.org/10.1007/BF01377960