2-5 October 2017
Hotel Intourist Kolomenskoye 4*
Europe/Moscow timezone

Gravitational gamma-resonance spectrometry of long-lived isomers and the possibility of its application for study of subtle gravitational effects

2 Oct 2017, 15:10
2h 50m
Petrovsky hall (Hotel Intourist Kolomenskoye 4*)

Petrovsky hall

Hotel Intourist Kolomenskoye 4*

Kashyrskoye shosse, 39B, Moscow, Russia, 115409

Speaker

Mr. Yuri Novozhilov (Institute Theoretical and Experimental Physics. NIC "Kurchatovskiy Institute")

Description

Messbauer effect – the emission/absorption of gamma-quantum with the momentum transfer of the impact to the kernel source/absorber and the crystal as a whole, allows, among other things, to study gamma line of long-lived isomers[1]. Theoretically, the natural width of/the gamma line of the kernel is determined by the ratio of $\Gamma_{natur} = \hbar/\tau$, where $\hbar$ - Planck's constant divided by $2\pi$ , $\tau$ - the average lifetime of nuclear level (line). The isomer $^{109m}Ag$ emits gamma line with $E_{\gamma} = 88.03 \cdot 10^3$ eV and $\tau = 57.7$ sec. Natural width of this line is $\Gamma_{natur} = 1.14\cdot10^{-17}$ eV. The isomer $^{103m}Rh$ emits gamma line with $E_{\gamma} = 39.75\cdot10^3$ eV and $\tau = 80.9$ [2, 4, 5]. Natural width of this line of $\Gamma_{natur} = 1.3\cdot10^{-19}$ eV, which is nearly $85$ times more than the the investigated silver[1]. In the case of studying the gamma resonances of the long-lived isomers with the measurement of the shape resonance by scanning of the peak of resonance absorption of gamma-line Doppler shift method is very difficult, because it would take the device generates the speed of the source relative to the absorber $\propto10^{-12}-10^{-13}$ $cm/sec$ that cannot a mechanical device. If the gamma quantum moves in the gravitational field and the point of emission and absorption have the height difference $\Delta h$ , it will have a shift of energy at the point of absorption relative to its energy at the point of emission $\Delta E_{\gamma} = E_{\gamma} g \Delta H / c^2$ , where $E_{\gamma}$ - is the energy of the gamma quantum at the point of emission, $g$ - is the gravitational acceleration, $\Delta h$ - is the difference between points of emission and absorption, c - is the speed of light. The typical difference in height to shift the energy of the gamma quantum on the value of the width of the resonance peak of long-lived isomers $^{109m}Ag$ and $^{103m}Rh$ will be $\propto10^{-4}-10^{-3}$ cm, which is easy possible. Experimental measurement of the natural width of the gamma-resonance peak of the isomer $^{109m}Ag$ is $\propto10^{-17}$ eV [1]. The expected natural width of the gamma resonance of $^{103m}Rh$ must be $\propto10^{-19}$ eV [1, 2]. This means that experimentally establish at resonance, the energy applied to the experimental setup width of the resonance peak scale can partially or completely disrupt resonant conditions. $\Delta E_{\gamma}/E_{\gamma}$ will be $\propto10^{-22}$, typical height difference $\Delta h$, needed to shift the energy of the gamma quantum on the width of the resonance peak of long-lived isomers are micrometers. To the same energy shift causes a change in the gravitational potential $\Delta g_{\gamma}/g \propto 10^{-13}$ [3]. This evaluation of the sensitivity of the gravitational gamma-ray spectrometer for weak gravitational interactions. References: 1. Davydov A. V."Advances in gamma ray resonant scattering and absorption ". Springer. Springer tracts in modern physics 261. 2015. 2. Davydov A.V., Isaev Yu. N., Kalantarov V. D. // Gravitational gamma-ray spectrometer for studying gamma resonance of long-lived isomer 103mRh. ANRY (Apparatus and News of Radiation Measurements), No 4, 2016, p. 31. 3. Davydov A.V., Isaev Yu. N., Korotkov M. M., // The Gravitational gamma-resonance spectrometry of long-lived isomers and the possibility of its application for study of subtle gravitational effects. Preprint ITEP 7-16. 2016. 4. The recommendations of the ICRP. Diagrams of the decays of radionuclides. The energy and intensity of radiation in 3 books. Book 2. Part 1. p. 66. M. Energoatomizdat.1987 5. The recommendations of the ICRP. Diagrams of the decays of radionuclides. The energy and intensity of radiation in 3 books. Book 2. Part 1. p. 18. M. Energoatomizdat.1987.

Primary authors

Dr. Andrey Davydov (Instinute Theoretical and Experimental Physics. NIC "Kurchatovskiy Institute") Mr. Yuri Novozhilov (Institute Theoretical and Experimental Physics. NIC "Kurchatovskiy Institute")

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