Observation of the Z=N+1 nuclei Y-77(39), Zr-79(40), and Mo-83(42)

Citation
Z. Janas et al., Observation of the Z=N+1 nuclei Y-77(39), Zr-79(40), and Mo-83(42), PHYS REV L, 82(2), 1999, pp. 295-298
Citations number
42
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
82
Issue
2
Year of publication
1999
Pages
295 - 298
Database
ISI
SICI code
0031-9007(19990111)82:2<295:OOTZNY>2.0.ZU;2-I
Abstract
The very neutron deficient Z = N + 1 nuclei Y-77(39), Zr-79(40), and Mo-83( 42) have been observed for the first time following the fragmentation of a Mo-92 beam. In contrast, no evidence was found for the existence of Nb-81(4 1) and Tc-85(43). The observation of Y-77(39) is of particular interest in light of the instability of the odd-proton, Z = N + 1 systems, Br-69(35), R b-73(37), Nb-81(41), and Tc-85(43), and may be explained as a consequence o f the shape polarizing effect of the highly deformed, prolate Z = N = 38 co re. The experimental results are discussed within the framework of the shel l-correction model, which together with proton-decay calculations allow an estimate of the proton separation energies of these highly exotic systems t o be calculated.