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1.
Nuclear spectroscopic quadrupole moments of the radioactive isotopes 131Cs, 132Cs, and 136Cs have been determined from the hyperfine structure of the state by the level crossing method. The results including a Sternheimer correction are: , , . The quadrupole moments of all the Cs isotopes from A = 131 to A = 137 are recalculated. It is shown, that nuclear quadrupole moments of a specific isotope obtained from different atomic P-states only agree within the limits of error after application of the Sternheimer correction. The increase of Qs with decreasing neutron number conforms with other observations and theoretical calculations stating that for elements around Z = 55 nuclear deformation develops below N = 82. The staggering of the sign of Qs may be interpreted as consequence of an oblate-prolate degeneracy of the nuclear energy surface. Some magnetic moments have been slightly improved: , (corrected for diamagnetism). 相似文献
2.
L.K. Kostov H. Rotter C. Heiser H. Prade F. Stary W. Andrejtscheff 《Nuclear Physics A》1982,376(3):451-462
Applying the generalized centroid shift method in (α, 2n) reactions, the half-lives of the 3080 keV 15+ state in 176Hf and of the 1637 keV 5? state in 178Hf have been measured as and , respectively. B(El) values of K-allowed E1 transitions are derived, and together with other data on similar transitions in odd-A nuclei, compared with predictions of the Nilsson plus pairing model. In 176Hf, the 15+ and 14? states at 3080 and 2866 keV, respectively, appear as quite pure deformed 4QP configurations. In the 2QP state at 1637 keV in 178Hf, possible strong mixing of vibrational components is discussed coupled via 2QP K-admixtures arising from the partial alignment of the neutron. 相似文献
3.
Using the atomic beam magnetic resonance method the hyperfine structure separation of has been measured in the atomic ground state. From the hyperfine structure splitting the nuclear magnetic dipole moment has been deduced. The results are: Δν = 4500 (68) MHz, μI = 0.641(10)μN. This is an improvement of approximately one order of magnitude compared to a previous measurement. The quoted value of the magnetic dipole moment includes corrections for the hyperfine structure anomaly and for diamagnetic shielding. 相似文献
4.
The magnetic hyperfine splitting vM=|gμNBHF/h| of 196mAu (jπ=12?; configuration ¦(π(; as dilute impurity in Ni has been determined with nuclear magnetic resonance on oriented nuclei as 96.0(2) MHz. With the known hyperfine field BHF = ?264.4(3.9) kG corrected for hyperfine anomalies the g-factor and magnetic moment of 196mAu are deduced to be |g| = 0.476(7) and |μ| = 5.72(8) μN. Taking into account the known magnetic properties of and isomeric states in the neighbouring odd Pt, Au and Hg nuclei the structure of the 12? state is discussed. 相似文献
5.
T.F. Thorsteinsen G. Løvhøiden J.S. Vaagen A. Bjørnberg D.G. Burke 《Nuclear Physics A》1981,363(1):205-232
Full angular distributions are presented for states populated in the reaction 180Hf(τ, α)179Hf at 32 MeV beam energy. Positive-parity states associated with the i unique parity intruder orbital are given special attention. Thus, angular distributions for the five first members of the [624] groundstate sequence are given, as well as for a number of more highly excited states, some being new assignments. The distribution of l = 6 transfer strength is quite characteristic, two + states being substantially more populated than the rest. The characteristic features of the data are explained by a quasiparticle-rotor calculation employing deformed Woods-Saxon orbitals, but only if the hexadecapole shape parameter of the nuclear potential is β4 ~ ?0.08. The often anomalous differential cross sections for band members are well accounted for by a rotor model CCBA calculation employing transfer form factors extracted from the orbitals of the deformed Woods-Saxon field, and including non-adiabatic Coriolis mixing effects. 相似文献
6.
R.V.F. Janssens M.J.A. de Voigt H. Sakai H.J.M. Aarts C.J. van der Poel H.F.R. Arciszewski D.E.C. Scherpenzeel J. Vervier 《Physics letters. [Part B]》1981,106(6):475-479
Using two Compton-suppression spectrometers in an Eγ?Eγ coincidence experiment, the yrast bands in 167,168Hf were extended up to and 28 ?, respectively. The i positive parity band in 167Hf experiences backbending at a higher frequency than the first backbending in 168Hf, and no second backbending is obseerved in 168Hf. New information is threby obtained on the nature and interaction strength of the crossing bands in the vicinity of N = 96. 相似文献
7.
The atomic beam magnetic resonance method combined with laser-induced state- and isotopeselective detection of metastable atoms has been used to investigate the hyperfine structure of the 2D ground multiplet in 175Lu and 176Lu. The analysis of the data yields not only accurate values for the hyperfine interaction constants, the nuclear magnetic dipole moment of 175Lu, and the electronic gJ, factors, but also the first directly measured value of the nuclear magnetic dipole moment of the low abundant isotope (corrected for diamagnetic shielding). The spectroscopic quadrupole moment of 176Lu was calculated from the ratio of the B-factors and the quadrupole moment of . Moreover, the magnetic hyperfine anomalies for the isotopic chain 175,176,176m,177Lu were determined. A quadrupole hyperfine anomaly between 175Lu and 176Lu was not found when comparing the ratio of the B-factors in the states . From a comparison of the quadrupole moment of 175Lu obtained from the hyperfine structure data and the quadrupole moment measured in muonic lutetium atoms semi-empirical Sternheimer shielding factors could be estimated. 相似文献
8.
Levels in 51Cr, 53Cr, 53Mn and 53Fe were excited via (α, n) or (α, p) reactions. Using the recoil-distance method, mean-lives (in ps) have been obtained for excited states (keV) in the residual nuclei: . Reduced transition probabilities calculated from these values are compared with the available theoretical values. 相似文献
9.
The magnetic hyperfine splitting νM = |gμNBHF/h| of ; in Fe has been measured with the technique of nuclear magnetic resonance on oriented nuclei as 320.4(1) MHz. With the known hyperfine field the magnetic moment of the ground state of 175Ta is deduced to be . 相似文献
10.
New quarks and new flavor-changing neutral currents give multiple lepton plus hadron final states in e+e-, . We observe that (i) e+e- is a favored place to search for their effects through inclusive ratios σ(e+e-+x:σ (μ+μ- +x): σ(e±μ±+x) and same sign leptons e±e±+x, μ±μ±+x,e±μ±+x. Above a new flavor threshold four charged lrpton final states may become important. (ii) Trilepton final states in are not sensitive to the presence of flavor-changing neutral currents. Much more sensitive are the processes are +e-+βand (for charm changing neutral currents) . 相似文献
11.
NMR of free atoms is observed via resonant charge exchange with optically pumped ions in He buffer gas, yielding . Applications of the method suitable for all group II elements and Yb include: precision measurements of nuclear moments, chemical shifts, hfs-anomalies, and investigation of charge exchange processes. 相似文献
12.
With the technique of nuclear magnetic resonance on oriented nuclei the hyperfine splitting in Fe has been measured With the known hyperfine field ground state of 177Ta is deduced to be . 相似文献
13.
The one-quasiparticle bands in the N = 99 nucleus 171Hf have been identified to spins of about using (heavy ion, xn) reactions. The moments of inertia of these bands are consistent with the absence of backbending in the N = 98 core nucleus. The half-life of the intrinsic state was measured as 63.6 ns. The strength of the transition is discussed. Two three-quasiparticle isomers with spins and parities have been identified and their suggested configurations are a neutron added to the 6+ and 8? two-quasiproton states of the core. The moment of inertia of a rotational band based on the isomer supports this suggestion, and shows the effect of partial rotation alignment of the neutron. 相似文献
14.
P. Heitjans H. Grupp W. Buttler F. Fujara H. Ackermann K. Dörr G. Kiese A. Körblein H.-J. Stöckmann 《Physics letters. [Part B]》1980,94(1):28-31
Polarized isomeric nuclei were produced by capture of polarized thermal neutrons in a NaF single crystal at room temperature. The asymmetric β-decay radition of 24Nam was used to detect nuclear magnetic resonance signals yielding the magnetic moment (uncorrected). 相似文献
15.
The g-factor of the isomeric state at 3.46 MeV in 38K has been measured by the differential spin precession method with the reaction. The result of g=+0.548 (μ=+3.836± 0.014 n.m.) is consistent with a pure configuration. 相似文献
16.
The decays of 3.25 min 169Hf and 2.05 min 167Hf have been studied with high-resolution Ge(Li) and Si(Li) detectors. The total decay energy of 169Hf determined from our experimental ratio is 3.29+0.05?0.13 MeV. The allowed unhindered character of the main β-branches in the decay of both isotopes allows unique Nilsson model assignments. 相似文献
17.
The quadrupole interaction frequencies in the 5? state of 118Sn have been measured by time differential perturbed angular correlation technique in Sn, Sb and (95% Sn+5% Sb) environments. The ω0 for 116Sn was determined in Sn environment only. With the help of the known electric field gradient 1) of Sn in a Sn lattice the quadrupole moments have been deduced as . These values together with the known2) quadrupole moment of the analogous 5? state in 120Sn are interpreted in terms of the pure single-particle model. The data exhibit the expected strong systematic variation of QI with the number of particles in the h. subshell which is being filled with 1, 3 and 5 neutrons in 116Sn, 118Sn, and 120Sn, respectively. 相似文献
18.
O. Häusser T.K. Alexander T. Faestermann D. Horn D. Ward H.R. Andrews I.S. Towner 《Physics letters. [Part B]》1978,73(2):127-130
The time-differential perturbed angular distribution method was used to determine the g-factors of the states in 43Ti and 43Sc. The results for the mass 43 mirror pair are: , . Considering in addition the magnetic moments in A = 41 and 42, it is suggested that the deformed states considered by Johnstone and Castel and by Erikson are responsible for the observed large deviations from the Schmidt values. 相似文献
19.
From the angular distributions of γ-rays emitted by oriented 129gTe and 129mTe nuclei implanted in iron by isotope separator, unique spin assignments could be made for the excited states of 129I at 487.4 keV , 696.0 keV , 729.6 keV , 768.9 keV , 1050.4 keV and 1111.8 keV . In addition, E2/M1 amplitude ratios for the following 129I γ-rays (energies are in keV) are derived: δ(459.6) = ?(0.076+0.037?0.148); δ(487.4) = 0.50+0.17?0.10 or δ? = 0.35+0.15?0.09; δ(556.7) = 0.06±0.02 or δ? = ?(0.10±0.02); δ(624.4) = 0.10±0.26 or δ? > 0.4; the 696.0 keV γ-ray is pure E2; δ(729.6) = ?(0.34±0.06) or δ?1 = 0.55±0.05; δ(741.1) = ?(0.27±0.10) or δ?1 = ?(0.43±0.12); δ(817.2) = 0.46±0.04 or δ?1 =0.20±0.03 if ; δ(1022.6) = ?(0.02 ±0.02) or δ?1 = ?(0.23±0.02); ; δ(1111.8) = 0.06±0.05 or δ?1 = ?(0.08±0.05). The anisotropy of the 531.8 keV γ-ray excludes as a possible spin assignment for the 559.6 keV level, so that no level is fed in the decay from 129Te. Anisotropies for the 209, 250.7, 278.4 and 281.1 keV γ-rays are also measured. Comparison of the level scheme is made with theoretical predictions from both the pairing-plus-quadrupole model and the intermediate coupling unified model. 相似文献
20.
Nuclear g-factors of isomeric bandheads in the transition nuclei 119I and 192Tl have been measured to be and . These values are in agreement with a model of one or two quasiparticles coupled to a deformed core. This interpretation is also supported by a preliminary quadrupole moment determination of . The lifetimes were remeasured to be and for the 119I and the 192Tl isomers, respectively. 相似文献