Specialization: 011200 Physics 
Program: 22 Experimental and theoretical investigation of atomic nuclei properties
Program manager:  Dr. K.A. Gridnev 
Department of Nuclear Physics
Scientific adviser: Dr. A.V. Derbin
Reviewer: Dr. V.M. Michailov

Axioelectric effect search for solar axions
Drachnev Ilia Sergeevich

This work was devoted to axioelectric effect search produced in axion-compton effect  and  bremmstuhlung as well as produced in 3He nuclei transition, which is produced in 
р+d →3He*  proton-proton cycle reaction.

Bremmsuhlung and Compton spectrum axions were searched with semiconductor HPGe-detector with sensitive volume of 160 cm3 mounted in a low-background setup including passive and active shielding and located on the Earth's surface. A new limit on axioelectric coupling constant has been obtained:  gAe  < 7×10-11  at C.L. 90% for axion mass range mA <  10 keV.

3He magnetic-type nuclei transition produced axions were searched with a bismuth germanate-based scintillation detector (BGO), located in a low-background setup including passive and active shielding with two-stage active shielding coincidence scheme.  As a result, a limit on axioelectric coupling constant has been obtained gAe  < 2×10-7  for 90% C.L. for axion mass range 100 ÷1000 keV.

    

The list of the publications 
1.	A.V. Derbin,   I.S. Dratchnev,  A.S. Kayunov, and V.N. Muratova,  Ограничения на константу связи аксиона с электроном для солнечных аксионов, возникающих в результате тормозного излучения и комптоновского процесса, JETP letters, v.95 p.7 pp 379-384.
2.	A.V. Derbin, S.V. Bakhlanov,  I.S. Dratchnev,  A.S. Kayunov, and V.N. Muratova Search for solar axions produced in the р+d →3He + A  reaction, accepted by EPJ