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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Structure/Spectroscopy

HK 10.13: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Direct proof of the |2+⊗ 3-two phonon character of the 11-state in 140Ce* — •T. Hartmann1, M. Babilon1,2, R.F. Casten2, J. Hasper1, A. Hecht2, M. Caprio2, and A. Zilges11Institut für Kernphysik, TU Darmstadt, Germany — 2Physics Department - Wright Nuclear Structure Laboratory, Yale University, New Haven, CT, USA

A (p,p’γ)-experiment has been performed at the ESTU tandem accelerator at Yale University using 9 high resolution Ge(HP) Clover-detectors and 4 proton detectors to investigate the decay pattern of the first excited Jπ=1-state in 140Ce. As in its N=82-isotones 142Nd and 144Sm this level is expected to be the member of a quintuplett of negative parity states arising from the coupling of two phonons (21+⊗ 31) representing surface oscillations. The two phonon character of this collective isoscalar mode had been confirmed for 142Nd and 144Sm, by measuring the branching ratio of its decay to the 31-state, where the branching ratio is 0.8% and 1.1%, respecitvely [1]. To proof the two-phonon character of this state in 140Ce, a branching ratio of only 0.4% had to measured.
* supported by the DFG (SFB 634 and Zi510/2-2) and by the US DOE (DE-FG02-91ER-40609)

[1] M. Wilhelm et al., Phys. Rev. C54 (1996) 449R.

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