Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 64: Radii, Masses, Heavy Nuclei

HK 64.5: Talk

Thursday, March 19, 1998, 15:30–15:45, E

Coulomb excitation of ²³¹Pa — •M. Würkner¹, J. de Boer¹, J. Choinski², T. Czosnyka², C. Droste³, C. Günther⁴, J. Iwanicki², M. Kisielinski², A. Kordyasz², M. Kowalczyk³, H. Kusakari⁵, J. Kvasil⁶, A.I. Levon⁷, M. Loewe¹, P.J. Napiorkowski², T. Shizuma⁸, G. Sletten⁹, J. Srebrny³, M. Sugawara¹⁰, T. Weber⁴, and Y. Yoshizawa¹¹ — ¹Sektion Physik, Ludwig-Maximilians-Univ. München, Garching — ²Heavy Ion Lab., Univ. of Warsaw, Poland — ³Nucl. Physics Divis., Univ. of Warsaw, Poland — ⁴Inst. für Strahl. u. Kernphys., Univ. Bonn — ⁵Fac. of Edu., Chiba Univ., Japan — ⁶Charles Univ., Prague, Czech Republik — ⁷Inst. for Nuclear Research, Kiev, Ukraine — ⁸Fac. of Sci. Dep. of Phys., Kyushu Univ., Japan — ⁹Niels Bohr Inst. Tandem Accel. Lab., Univ. of Copenhagen, Roskilde, Denmark — ¹⁰Ciba Inst. of Techn., Japan — ¹¹Coll. of Indu. Techn., Japan

The evaluation of γ-γ coincidences gathered from 20 germanium detectors of NORDBALL in coincidence with either a silicon detector or a multi-PIN-diode detector using ³²S (148 MeV) and ⁵⁸Ni (260 MeV) beams gives new insight in the the structure of ²³¹Pa located near the boundary of octupole deformation. Additionally to the 1/2[530] 3/2⁻ g.s. rotational band the 3/2[651] band is observed up to 33/2⁺. New calculations of the depopulation process following Coulomb excitation and of the structure using the quasiparticle-phonon-model complement the previous work [1].

[1] A.I. Levon et al. Nuc. Phys. A 598 (1996), 11-46 Supported by DFG grant Bo1109/1-5 , Volkswagen foundation and WTZ