Author/Authors :
Sلenz، نويسنده , , C. and Morales، نويسنده , , J. and Villar، نويسنده , , J.A. and Morales، نويسنده , , A. and Puimedَn، نويسنده , , J. and Ortiz de Solَrzano، نويسنده , , A. and Garcيa، نويسنده , , E. and Nٌْez-Lagos، نويسنده , , R. and Salinas، نويسنده , , A. and Sarsa، نويسنده , , M.L. and Kuzminov، نويسنده , , V. E. Klimenko ، نويسنده , , A. and Metlinsky، نويسنده , , N. and Novikov، نويسنده , , V. and Pomansky، نويسنده , , A. and Pritychenko، نويسنده , , B.، نويسنده ,
Abstract :
A search for double positron decay and electron capture with positron emission in the transition 78Kr(0gs+) → 78Se(0gs+) has been carried out by using a high pressure ionization chamber surrounded by a set of NaI detectors. Coincidences between the emitted positron(s) and the two (four) consequent annihilation gammas have been looked for as signature(s) of the process(es). The ionization chamber of krypton gas (enriched up to 94.08% in the 78 isotope) registers the positron energy, whereas the set of sodium iodide scintillators searches for the annihilation gamma rays. The features and performances of the experimental device are presented and the results obtained for the half-life limits of the processes investigated are reported.
