The current stage of experiments on studying the influence of the temperature and gravity on the Ag-109 gamma resonance

We present the results of experiments devoted to the investigation of the i nfluence of the temperature and gravity on the resonance absorption of gamm a quanta of Ag-109 with an energy of 88 keV in a silver single crystal cont aining a Cd-109 parent nuclide. We measured the ratio R of the intensity of a Ag-109 gamma line to the intensity of a gamma line from a reference nonr esonant Am-241 gamma source in horizontal and vertical directions with an e xternal magnetic field (of geomagnetic origin) directed antiparallel to the horizontal gamma beam. When the temperature was decreased from 77 to 4.2 K , the relative change of R was 0.00397 +/- 0.00069 for the horizontal beam and -0.00093 +/- 0.00067 for the vertical beam. The negative value of Delta R/R for the vertical beam is accounted for by a small turn of the plane of the gamma source accompanying the decrease in the temperature from 77 to 4 .2 K. Introducing a correction including this turn, we arrive at a value of Delta R/R for the horizontal direction equal to 0.00300 +/- 0.00096, which corresponds to the broadening factor of the Mossbauer Ag-109 gamma line ly ing in the range from 1 to 3. Recalculating this parameter for the natural direction of the magnetic field of the Earth, we find that this result is c onsistent with the data of previous studies.