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Helvetica Physica Acta

Volume 54 (1981)
Issue 1 1
Article: Résonance de spin électronique de Gd et d'Eu dans les supraconducteurs SnMo6S8 et PbMo6S8 en poudre 1
Article: On the kinetics of condensation through homogeneous nucleation 85
Article: An approach to metastability in some ferromagnetic systems 106
Article: Three particle bound states in even λP(φ)_2 models 131
Issue 2 191
Article: Bounds on Ising partition functions. I 191
Article: Bounds on Ising partition functions. II, Application to frustration 201
Article: General relativistic effects on the cooling of neutron stars 214
Association News: Bericht über die Frühjahrstagung der Schweizerischen Physikalischen Gesellschaft, Neuchâtel, 9. + 10. April 1981 219
Issue 3 341
Article: Analyticity and Borel-summability of the perturbation expansion for correlation functions of continuous spin systems 341
Article: Dispersion relations for Feynman graphs 364
Article: (Quasi-) momentum, (quasi) angular momentum and spin for condensed media 383
Article: Phenomenological expression for densities and currents in condensed media and Umklapp processes 395
Article: Vacuum polarization test and search for direct muon-hadron interaction from muonic X-rays 406
Article: 50 years ago Pauli invented the neutrino 411
Article: The vacuum structure of the Schwinger model and its external field problem 419
Article: General features of total hadron-nucleus reaction cross sections 432
Article: Elastic scattering of α particles from 16O near the Coulomb barrier 439
Article: Aharonov-Bohm scattering : comment on a paradox 444
Article: Electromagnetic properties of the pion in the dressed quark model 447
Article: Spin relaxation and dissipative Schrödinger like evolution equations 457
Issue 4 471
Article: The electronic structure of hydrogen in elemental metals in the light of muon spin rotation (μSR) investigations 471
Article: The (n, d) differential elastic cross section at 2 MeV 547
Article: Direct measurement of the muonium hyperfine frequencies in quartz 552
Article: Effect of the ponderomotive force in interaction of an amplitude modulated rf-field with a nonuniform plasma 561
Article: Formation volume and energy of a vacancy : lattice distortion and non-linear screening in aluminium 570
Association News: Rapport de la réunion d'automne de la Société Suisse de Physique (SSP), Davos, 24-26 septembre 1981 580
Table of Contents 659
Index: Author's index = Autorenregister = Table des auteurs 668