SEARCH FOR NARROW SUM-ENERGY LINES IN ELECTRON-POSITRON PAIR EMISSIONFROM HEAVY-ION COLLISIONS NEAR THE COULOMB BARRIER

Authors
AHMAD I AUSTIN SM BACK BB BETTS RR CALAPRICE FP CHAN KC CHISHTI A CHOWDHURY P CONNER C DUNFORD RW FOX JD FREEDMAN SJ FREER M GAZES SB HALLIN AL HAPP T HENDERSON D KALOSKAMIS NI KASHY E KUTSCHERA W LAST J LISTER CJ LIU M MAIER MR MERCER DJ MIKOLAS D PERERA PAA RHEIN MD ROA DE SCHIFFER JP TRAINER TA WILT P WINFIELD JS WOLANSKI M WOLFS FLH WUOSMAA AH XU G YOUNG A YURKON JE
Citation
I. Ahmad et al., SEARCH FOR NARROW SUM-ENERGY LINES IN ELECTRON-POSITRON PAIR EMISSIONFROM HEAVY-ION COLLISIONS NEAR THE COULOMB BARRIER, Physical review letters, 75(14), 1995, pp. 2658-2661
Citations number
22
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
75
Issue
14
Year of publication
1995
Pages
2658 - 2661
Database
ISI
SICI code
0031-9007(1995)75:14<2658:SFNSLI>2.0.ZU;2-C
Abstract
The first results are presented from a new experiment, APEX, designed to study the previously reported sharp lines in sum-energy spectra of positrons and electrons produced in collisions of very heavy ions. Dat a were collected for U-238 + Ta-181 at 5.95, 6.10, and 6.30 MeV/u and U-238 + Th-232 at 5.95 MeV/u. In none of our analyses is any evidence found for sharp sum-energy lines. For the specific case of the isolate d decay of a neutral particle of mass 1.4-2.1 MeV/c(2), the upper limi ts on cross sections obtained from the present data are significantly less than the previously reported cross sections.