Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 63: Spectroscopy: 180 ≤ A ≤ 208
HK 63.6: Talk
Thursday, March 19, 1998, 15:15–15:30, D
g Factor of a Magnetic–Rotational State in 193Pb ∗ — •S. Chmel1, F. Brandolini2, R. Ribas3, G. Baldsiefen1, A. Görgen1, M. De Poli4, P. Pavan2, and H. Hübel1 — 1Inst. für Strahlen– und Kernphysik, Univ. Bonn, D-53115 Bonn, Germany — 2Dipartimento di Fisica and INFN, I-35131 Padova, Italy — 3Instituto de Fisica, Univ. de São Paulo, São Paulo, Brasil — 4Istituto Naz. di Fisica Nucleare, LNL, I-35020 Legnaro, Italy
The recently discovered regular bands of enhanced M1 γ–ray transitions in nearly spherical Pb nuclei have been explained in terms of magnetic rotation. However, the special angular momentum coupling of the nucleons that form magnetic–rotational states has never been tested experimentally. We report on the measurement of the g factor of the 2583–keV head of such a band in 193Pb using the time-differential perturbated angular distribution (TDPAD) method. The result, g = 0.68 (3), is the first direct proof of the almost perpendicular coupling of the proton–particle and neutron–hole angular momentum vectors. This coupling results in a large component of the magnetic moment perpendicular to the total nuclear angular momentum, which is required for the occurrence of magnetic rotation.
∗supported by BMBF