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HK: Hadronen und Kerne
HK 64: Radii, Masses, Heavy Nuclei
HK 64.4: Talk
Thursday, March 19, 1998, 15:15–15:30, E
Indication on the ground state energy of 229Pa — •A.I. Levon1,2, J. de Boer1, M. Loewe1, M. Würkner1, T. Czosnyka3, J. Iwanicki3, and P.J. Napiorkowski3 — 1Sektion Physik, Ludwig-Maximilians-Univ. München, Garching — 2Inst. for Nuclear Research, Kiev, Ukraine — 3Heavy Ion Lab., Univ. of Warsaw, Poland
The ground state energy of 229Pa is significant in view of possible octupole deformation [1]. The Q-value of the 231Pa(p,t)-reaction to the 3/2− head of the K=1/2− band was found to be -4145(1) keV. A ground state Q-value of -4126(9) keV can be obtained from the Atomic Mass systematics. Information on energy and spin of the ground state can be deduced from the 3/2− → g.s. transition. Corresponding low-energy γ-ray can be observed if the spin of the ground state is really 5/2+ as suggested in [2] and thus multipolarity of the transition is E1. Coincidences (t,γ) following the 231Pa(p,t)-reaction were observed with this aim. The transition energy was found to be 11.6±0.3 keV. It leads to a value of Qg.s.=-4133(2) keV and mass defect of 229Pa 29894(3) keV. The result supports also the 5/2+ spin assignment.
[1] R.M.Sheline Phys. Rev. C 48 (1993), 1003
[2] I.Ahmad et al. Phys. Rev. Lett. 49 (1982), 1758 Supported by DFG grant Bo1109/1 and WTZ