1. STUDY OF HIGH-SPIN STATES IN EU-150 AND EU-151
- Author
-
JONGMAN, [No Value], BACELAR, JCS, VANPOL, J, NYBERG, J, SLETTEN, G, DIONISIO, JS, VIEU, C, LAGRANGE, JM, PAUTRAT, M, Urban, W, and KVI - Center for Advanced Radiation Technology
- Subjects
XE-136(F-19,4N), (F-19,5N), E=78, 85 MEV ,NUCLEI ,SHAPES ,SPECTRA ,MEASURED E(GAMMA), GAMMA-MULTIPLICITY, GAMMA-GAMMA(T), E-GAMMA(T), DCO-RATIOS ,BAF2-MULTIPLICITY FILTER, CRYO-TARGET, E-GAMMA-SPECTROMETER, ISOTOPICALLY ENRICHED TARGETS ,ND-148(LI-7,4N), (7LI,5N), E=40, 50 MEV ,EU-151, EU-150 DEDUCED LEVELS, J, PI, ICC, NORDBALL MULTI-GE-DETECTOR ARRAY - Abstract
High-spin states in Eu-150,Eu-151 were populated by the Xe-136(F-19, xn)Eu-155-xn reaction. Extensive e gamma-, gamma gamma-measurements led to new level schemes of Eu-150,Eu-151. Most observed excitations are interpreted as quasi-rotational bands built on top of multi-p-h states. Enhanced E1 decays competing with E2 transitions indicate an octupole instability of these nuclei at medium spin. Furthermore, a few negative parity bands of Eu-151 decay through large M1 interband transitions which are interpreted as rotations of a triaxial shape. The observed structures at high spin, especially for Eu-151, show the coexistence of axial and non-axial symmetric shapes.
- Published
- 1995