Naslov
Search for double-photon decay of the Ag-109 metastable state at 88 keV

Autori
Ilakovac, Ksenofont ; Jerbić-Zorc, Gorjana ; Pešić, Roko ; Horvat, Vladimir

Izvornik
Fizika (0015-3206) 20 (1988), 1; 91-98

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
double-photon decay; coincidence measurements

Sažetak
Double-photon decay of the metastable state of Ag-109 at 88 keV was studied. In the process photon pairs which share continuously the transition energy are emitted. Radioactive Cd-109 was used as the generator of silver atoms in the excited state. A pair of germanium detectors in a 130⁰ geometry and a fast-slow coincidence system with a 128 x 512 x 512 three-parameter pulse height analyzer were used in the measurements. Energy calibration was based on coincidence events of Kα and Kβ X-rays of silver with continuum radiation and on accidental coincidences of the 88 keV gamma rays. The sum spectrum shows no peak at the position where the events due to double-photon decay were expected. The analysis of data yielded an upper limit of the relative transition probability w(γγ)/w(γ)≤6∙10⁻⁷. The theoretical estimates derived from the theory of Grechukhin are 12 ∙ 10⁻⁷ for the square-well potential and 5.6∙ 10⁻⁷ for the spherical oscillator potential.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA