AN IONIZATION-CHAMBER FOR COINCIDENCE EXPERIMENTS IN A SEARCH FOR DOUBLE-BETA POSITRON DECAY AND ELECTRON-POSITRON CONVERSION OF KR-78

Authors
SAENZ C MORALES J VILLAR JA MORALES A PUIMEDON J DESOLORZANO AO GARCIA E NUNEZLAGOS R SALINAS A SARSA ML KUZMINOV V KLIMENKO A METLINSKY N NOVIKOV V POMANSKY A PRITYCHENKO B
Citation
C. Saenz et al., AN IONIZATION-CHAMBER FOR COINCIDENCE EXPERIMENTS IN A SEARCH FOR DOUBLE-BETA POSITRON DECAY AND ELECTRON-POSITRON CONVERSION OF KR-78, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 356(2-3), 1995, pp. 220-229
Citations number
30
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
356
Issue
2-3
Year of publication
1995
Pages
220 - 229
Database
ISI
SICI code
0168-9002(1995)356:2-3<220:AIFCEI>2.0.ZU;2-N
Abstract
A search for double positron decay and electron capture with positron emission in the transition Kr-78(O-gs(+))-->Se-78(O-gs(+)) has been ca rried 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 ga s (enriched up to 94.08% in the 78 isotope) registers the positron ene rgy, whereas the set of sodium iodide scintillators searches for the a nnihilation gamma rays. The features and performances of the experimen tal device are presented and the results obtained for the half-life li mits of the processes investigated are reported.