[en] Existence and properties of spontaneously fissioning isomers are discussed as consequences of a double fission barrier. The measurement of the quadrupole moment of the fission-isomeric state by the new developed method for the determination of lifetimes of excited states yields to a prolate shape of the the nucleus. The deformation ratio is 2:1 in the second minimum of the fission potential. (orig./WL)

[en] Keeping in mind some results previously obtained, the electric multipole moment operators of the atomic nuclei are given. The electric quadrupole moment operator of the deuteron thus obtained is not the same of the one commonly available in literature

[en] The following tabel is a compilation of quadrupole interaction frequencies νsub(Q)(1) νsub(Q) = e x Q x Vsub(z)sub(z)/h observed in pure metals and at the site of dilute impurities in metallic host lattices. In eq.(1) e is the positive elementary charge, Q the spectroscopic nuclear quadrupole moment, Vsub(z)sub(z) the second derivative of the electrostatic potential at the nuclear site (major axis system, z-axis direction of largest component) and h is Plank's constant. The axial asymmetry parameter of the electric field gradient is given by:(2) eta = Vsub(x)sub(x) - Vsub(y)sub(y)/Vsub(z)sub(z). Data published up to July 1980 have been taken into account. All experimental values are expressed in terms of the quadrupole interaction frequency, as defined by eq.(1). The entries are listed in the order of increasing atomic number of the probe. Energy, spin, half-life and, where available, the quadrupole moment of the level are given for each probe. (orig./HOF)

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[en] Published in summary form only

[en] A Comment on the Letter by N. Imai et al., Phys. Rev. Lett. 92, 062501 (2004). The authors of the Letter offer a Reply

[en] Based on the rotationally invariant core model a simple expression is derived which relates the electric quadrupole moments of quasi-rotational states of even-even nuclei to the excitation energies of the corresponding levels. This relationship is successfully tested on available experimental data. Also a comparison is made with other simple approaches for transitional quadrupole moments deduced from intraband B(E2) values. (orig.)

No abstract available