Contents

JETP Letters

Vol. 109, No. 1, 2019

Fields, Particles, and Nuclei

On the Measurement of Sachs Form Factors in Processes without and with Proton Spin Flip

M. V. Galynskii p. 1  abstract

Astrophysics and Cosmology

Negative Temperature for Negative Lapse Function

G. E. Volovik p. 8  abstract

Optics and Laser Physics

Spectral and Spatial Characteristics of the Electromagnetic Modes in a Tunable Optical Microcavity Cell for Studying Hybrid Light–Matter States

D. S. Dovzhenko, I. S. Vaskan, K. E. Mochalov, Yu. P. Rakovich and I. R. Nabiev p. 12  abstract

Condensed Matter

Acousto-Optical Properties of Heterogeneous Media with a Nonuniform Distribution of Nanoparticles

N. I. Petrov and V. I. Pustovoit p. 18  abstract

Josephson Vortex Motion in a Layered Bi2 + xSr2 – xCuO6 + δ Single Crystal in Parallel High Magnetic Fields

S. I. Vedeneev p. 24  abstract

Terahertz Vibrational Modes in CH3NH3PbI3 and CsPbI3 Perovskite Films

A. V. Andrianov, A. N. Aleshin and L. B. Matyushkin p. 28  abstract

Features of the Dynamics of a System of Coupled Josephson Junctions with Topologically Trivial and Nontrivial Barriers: Manifestation of the Majorana Mode

I. R. Rahmonov, Yu. M. Shukrinov, K. V. Kulikov, T. Belgibaev, A. Plecenik, D. V. Anghel and W. Nawrocki p. 33  abstract

Nonresonant Excitation of a Magnon Bose–Einstein Condensate in MnCO3

Yu. M. Bunkov, A. V. Klochkov, T. R. Safin, K. R. Safiullin and M. S. Tagirov p. 40  abstract

Phase Diagram of the Two-Orbital Model for Iron-Based HTSC: Variational Cluster Approximation

Ya. V. Zhumagulov, V. A. Kashurnikov, A. V. Krasavin, A. E. Lukyanov and V. D. Neverov p. 45  abstract

Self-Detection of Ultrasonic Standing Waves and Anomaly of Young’s Modulus at Uniaxial Extension Whiskers of the Quasi-One-Dimensional Conductor TaS3

M. V. Nikitin, V. Ya. Pokrovskii, S. G. Zybtsev and A. V. Frolov p. 51  abstract

Reconstruction of the Density of States at the End of an S/F Bilayer

I. V. Bobkova and A. M. Bobkov p. 57  abstract

Light Absorption Properties Related to a Long-Lived Ensemble of Spin Excitations in an Unpolarized Quantum Hall System

S. Dickmann p. 63  abstract

Third Order Anharmonic Effects in Many-Body Nuclear Quantum Theory

S. P. Kamerdzhiev and M. I. Shitov p. 69  abstract