AN ELECTRON-POSITRON PAIR SPECTROMETER FOR HIGH-ENERGY DECAYS OF NUCLEI

Authors
MONTOYA CP SCHADMAND S VARMA R ZHANG PH BUTSCH R DIOSZEGI I HOFMAN DJ PAUL P
Citation
Cp. Montoya et al., AN ELECTRON-POSITRON PAIR SPECTROMETER FOR HIGH-ENERGY DECAYS OF NUCLEI, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 334(2-3), 1993, pp. 437-446
Citations number
19
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
334
Issue
2-3
Year of publication
1993
Pages
437 - 446
Database
ISI
SICI code
0168-9002(1993)334:2-3<437:AEPSFH>2.0.ZU;2-E
Abstract
A highly segmented phoswich array of plastic scintillators has been co nstructed for measurements of (e+, e-) pairs emitted in high energy el ectromagnetic transitions in nuclei. Electron (positron) energies of 2 -30 MeV can be measured by each individual element, with a total trans ition energy resolution of deltaE/E = 13% for a 20 MeV transition. The array covers 29% of 4pi and its efficiency is 1.6% for a 6 MeV E0 int ernal pair decay, and 1.1% for an 18 MeV El transition. These efficien cy values include cuts which reduce background and optimize energy res olution. Experimental results are compared with GEANT simulations demo nstrating the detector's ability to determine transition multipolariti es.