The atomic mass of $^{136}\mathrm{Xe}$ has been measured by comparing cyclotron frequencies of single ions in a Penning trap. The result, with 1 standard deviation uncertainty, is $M(^{136}\mathrm{Xe})=135.907$ 214 484 (11) u. Combined with previous results for the mass of $^{136}\mathrm{Ba}$ [Audi, Wapstra, and Thibault, Nucl. Phys. A 729, 337 (2003)], this gives a $Q$ value $(M[^{136}\mathrm{Xe}]\ensuremath{-}M[^{136}\mathrm{Ba}]){c}^{2}=2457.83(37)\text{ }\text{ }\mathrm{keV}$, sufficiently precise for ongoing searches for the neutrinoless double-beta decay of $^{136}\mathrm{Xe}$.

Mass and double-beta-decay Q value of Xe-136

Electric monopole transitions between 0+ states for nuclei throughout the periodic table

Nuclear Data Sheets for A = 137☆

Description of nuclear collective motions in terms of the boson expansion technique: (II). Additional formulation and numerical calculations

Measurements of E2/M1 and E0/E2 multipole mixing ratios of transitions in even-even nuclei have long provided important tests of nuclear models. The experimental data for transitions in even-even nuclei have been critically surveyed to provide the most accurate results for comparisons with theoretical calculations. The theoretical approaches to the calculations of these mixing ratios on the bases of different nuclear models are considered and compared with experimental data. The variations in signs and magnitudes of the E2/M1 mixing ratios from nucleus to nucleus for the same class transitions and within a given nucleus for transitions from different spin states suggest that a microscopic approach is needed to explain the data theoretically. The pairing-plus quadrupole model has achieved the first successes in predicting these variations, primarily in the osmium to platinum region.

E0-E2-M1 multipole admixtures of transitions in even-even nuclei

Semi-microscopic description of even tellurium isotopes

A simple explanation of the sign and magnitude of quadrupole moments in even-A Fe, Zn, Cd, Te and Hg isotopes

Semimicroscopic description of even Cd spectra

Chaotic dynamics of the elliptical stadium billiard in the full parameter space

Two-dimensional billiards of a generalized parabolic lemonlike shape are investigated classically and quantum mechanically depending on the shape parameter δ. Quantal spectra are analyzed by means of the nearest-neighbor spacing distribution method. Calculated results are well accounted for by the proposed new two-parameter distribution function P(s), which is a generalization of Brody and Berry-Robnik distributions. Classically, Poincare diagrams are shown and interpreted in terms of the lowest periodic orbits. For δ=2, the billiard has some unique characteristics resulting from the focusing property of the parabolic mirror. Comparison of the classical and quantal results shows an accordance with the Bohigas, Giannoni, and Schmit conjecture and confirms the relevance of the new distribution for the analysis of realistic spectral data.

Vjera Lopac

Papers

Semi-microscopic description of even tellurium isotopes

A simple explanation of the sign and magnitude of quadrupole moments in even-A Fe, Zn, Cd, Te and Hg isotopes

Semimicroscopic description of even Cd spectra

Chaotic dynamics of the elliptical stadium billiard in the full parameter space

Classical and quantum chaos in the generalized parabolic lemon-shaped billiard