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S. Pfefferle,
J. Schöpf,
M. Kögl,
C. Friedel,
M. A. Müller,
T. Stellberger,
von E. Dall’Armi, P. Herzog,
S. Kallies,
D. Niemeyer, [......],
I. Steffen,
F. Weber,
V. Thiel,
G. Herrler,
H. J. Thiel,
C. Schwegmann-Wessels,
S. Pöhlmann,
J. Haas,
C. Drosten,
A. von Brunn
PLoS Pathog. 01/2011; in press.
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ABSTRACT: The 48.7 m111m
Cd activity was implanted in Zn and Be single crystals which were soldered to the cold finger of a dilution refrigerator and kept below 0.2 K during implantation. Subsequent nuclear orientation experiments allowed the determination of the quadrupole interaction frequencyv
Q
of the 11/2– isomeric state of111Cd in Zn and Be as –139 (15) MHz and +43(16) MHz respectively. With these results we derive the quadrupole moment of the 5/2+ 245 keV level of111Cd including sign asQ = +0.83(13) b and the sign of the electric field gradient for Cd in Be. The half-life of111m
Cd was redetermined as 48.67 (6) m.
Zeitschrift für Physik A Hadrons and Nuclei 01/1980; 294(1):13-15.
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ABSTRACT: Time differential perturbed angular correlation and nuclear orientation studies of the electric quadrupole interaction for Hg in Sb have been performed. The effective field gradients |V
zz
eff
(HgSb)|=1.43(18)1017V cm–2 at room temperature andV
zz
eff
(HgSb)=+1.8(2) 1017V cm–2 below 0.05 K have been derived. These two values are no indication for an anomalous temperature dependence of the effective field gradient for Hg in Sb. The value of the electric field gradient fits well into the systematics for Hg in other hosts. It is shown that the electronic enhancements of the field gradients are correlated to the valence of the impurities and are rather insensitive to the host properties.
Zeitschrift für Physik B Condensed Matter 11/1978; 31(4):395-400.
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ABSTRACT: By use of low temperature nuclear quadrupole orientation the quadrupole coupling constant of69mZn in a Zn single crystal has been determined asv
Q=eQV
zz/h=–28(3) MHz.A positive sign forV
zzat the nuclear site of Zn in Zn is deduced. The half-life of69mZn has been remeasured asT
1/2=13.756 (18)h.
Hyperfine Interactions 12/1976; 3(1):361-363. · 0.21 Impact Factor
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ABSTRACT: The half-life of the state at 341 keV in 127Te was remeasured by the delayed coincidence technique with the result psec. The magnetic moment of this state was determined from an integral perturbed directional correlation measurement using the magnetic hyperfine field for Te in an iron host lattice. We derived the g-factor of the 341 keV state, g = −0.214 ± 0.014. This value and the reduced transition probabilities for the transition support the interpretation of the 341 keV level as an “anomalous coupling state”.
Nuclear Physics A. 224(2):358-366.
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ABSTRACT: The αγ linear polarization correlation coefficients of the 271 keV and 401 keV γ-transitions in the decay of 219Rn have been determined to be B2 = 0.029±0.011, B4 = 0.0147±0.0042; B2 = -0.093 ± 0.0084, B4 = 0.0130±0.0034, respectively. The 130 keV γ-271 keV γ angular correlation has the coefficients: A2 = -0.060±0.041, A4 = 0.003±0.073. The E2/M1 mixing ratio δ2 = 0.32±0.070.05 of the 130 keV transition has been derived from a L-subshell conversion coefficient measurement. The values A2 = -0.060±0.020 and A4 = -0.157±0.020 have been measured for the α-271 keVγ angular correlation. Comparison with theoretical predictions taking mixing of α-waves into account leads to a spin assignment for the ground state of 219Rn and for the levels at 401 keV, 271 keV and 0 keV in 215Po (, respectively). This is in contradiction to all previous assignments. An interpretation of the decay scheme is attempted.
Nuclear Physics A. 157(2):456-470.
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Zeitschrift für Physik A Hadrons and Nuclei 294(1):13-15.
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ABSTRACT: An investigation of the electromagnetic properties of the Kπ = 2− octupole band in 182W populated in the β− decay of 182Ta was undertaken. The multipolarity mixings of the intraband 114 keV and 85 keV transitions were determined from L-subshell measurements. The mixing parameters δ2(E2/M1) are 0.130(7) and 0.124(2) respectively. The directional correlations of the (100–1121) keV, (100–1157) keV and (100–1189) keV cascades were investigated. The E1, M2, E3 mixing of the 1189 keV transition was extracted from the angular correlation coefficients and conversion data taken from the literature. We get a mixing of (57.0 ± 3.7) % E1 + (13.7 ± 1.9) % M2 + (29.3 ± 6.6) % E3. A centroid shift determination of the lifetime of the 3−(1374keV)state gave the result τ = 112 ± 15 ps. From this we obtain the reduced E3 transition probability from the ground state as B(E3; O+ → 3−) = (8.0 ± 1.2) · 104e2 · fm6 = (41 ± 6)SPU. The g-factor of this state was measured using the integral PAC method in the hyperfine field of an iron host lattice yielding g = 0.32(9). The experimental data are discussed in terms of the collective model taking into account Coriolis coupling.
Nuclear Physics A.
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ABSTRACT: In a study of the level scheme of 106Pd, we have measured the γ-γ directional correlations of the 1045-512 keV and 616-512 keV.cascades. The linear polarization correlations were measured for the -512 keV, -512 keV and -1045 keV cascades. The linear polarization at Θ = 90° was measured for the -512 keV, -1046 keV, -1046 keV and 221- keV cascades. Spin, parity and multipolarity assignments are derived. A redetermination of the half-life of the 2951 keV level did not confirm the previously reported value of . Instead we found .
Nuclear Physics A.
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ABSTRACT: A system for low temperature nuclear orientation studies is presented where the sample can be prepared by in situ implantation of ions from an isotope separator into a host lattice at temperatures <0.5 K. The special construction of the cryostat necessary for this purpose as well as the beam line from the isotope separator to the cryostat are described in detail. A description of the data acquisition arrangement appropriate to the experiments planned is given. The cooling characteristics of the refrigerator under different operating conditions are discussed. A first successful nuclear magnetic resonance experiment on oriented 197mHg implanted in situ at T<0.5 K is reported.
Nuclear Instruments and Methods.
