Göttingen 1997 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Hadronen und Kerne

HK 62: Kernspektroskopie, mittelschwere Kerne IV, schwere Kerne VI

HK 62.6: Vortrag

Donnerstag, 27. März 1997, 18:15–18:30, HS E

In-beam study of the Nü nucleus ¹⁴⁶Tb — •R. Collatz^1,2, N. Amzal^1,3,4, P. Kleinheinz⁴, C. Schück¹, Ch. Vieu¹, Z. Méliani^1,3, J.S. Dionisio¹, and J. Blomqvist⁵ — ¹CSNSM, Orsay, France — ²GSI Darmstadt, Germany — ³USTHB Alger, Algeria — ⁴KFA Jülich, Germany — ⁵RIT Stockholm, Sweden

The nucleus ¹⁴⁶Tb was studied through in-beam γγ- and γe⁻ measurements at the Tandem accelerators of Strasbourg and Orsay. The sofar unknown level scheme built on the 780 keV (πh_11/2νh_11/2⁻¹) 10⁺ isomer was established up to ∼5 MeV. Spins and parities were assigned from conversion electron and DCO measurements. The observed high-spin states are 4qp-excitations formed by the couplings of the πh_11/2νh_11/2⁻¹ valence nucleons to the octupole state or the higher-lying πh_11/2d_5/2⁻¹ and πh_11/2g_7/2⁻¹ particle-hole excitations of the ¹⁴⁶Gd-core. The configuration assignments are supported by parameter-free recoupling calculations, where the (πh_11/2νh_11/2⁻¹) 11⁺ and 8⁺ states, identified here, were of crucial importance. The agreement with experiment is excellent.