Tübingen 2003 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Poster-Sitzung: Kernphysik/Spektroskopie

HK 10.13: Poster

Dienstag, 18. März 2003, 13:30–15:30, Foyer

Lifetimes in stretched E2 Bands of ¹⁴²Gd measured with DSAM at EUROBALL — •E.O. Podsvirova^1,2, A.A. Pasternak², R.M. Lieder¹, W. Urban³, W. Gast¹, H.M. Jäger¹, L. Mihailescu¹, R. Menegazzo⁴, G. de Angelis⁵, A. Gadea⁵, D.R. Napoli⁵, S. Chmel⁶, G. Duchêne⁷, T. Morek³, and T. Rzaca-Urban³ — ¹IKP, FZ Jülich, D-52425 Jülich — ²A.F. Joffe PTI, RU-194021 St. Petersburg — ³IEP, Univ. Warsaw, PL-00-681 Warsaw — ⁴INFN, Sezione di Padova, I-35131 Padova — ⁵INFN, LNL, I-35020 Legnaro — ⁶ISKP, Univ. Bonn, D-53115 Bonn, Germany — ⁷IReS, F-67037 Strasbourg, France

To study lifetimes in ¹⁴²Gd we have carried out a DSAM experiment with EUROBALL IV at IReS Strasbourg using the ¹¹⁴Sn(³²S,2p2n) reaction at a beam energy of 160 MeV. The initial recoil velocity is v/c = 2.2% for the used reaction. EUROBALL IV was equipped with an inner BGO ball and the particle detector array EUCLIDES to increase the selectivity for the reaction channel of interest. The DSAM line shape analysis was carried out in doubly-gated coincidence spectra. The longest E2 band in ¹⁴²Gd based on a 10⁺ isomer of (π h_11/2)² configuration is known up to I=34. TRS calculations suggest that for this band the nuclear shape will move at high spins into a well-deformed, triaxial minimum (β₂ = 0.25, γ = 26.5^∘). For the stretched E2 transitions of this band in the spin 14 - 26 region B(E2) values of ≈ 60 W.u. have been found. This result indicates a considerable enhancement of the stretched E2 transitions for the quadrupole band in ¹⁴²Gd.

The work was partly supported by the German-Russian WTZ contract RUS 99/191 and by the EU contract HPRI-CT-1999-00078.