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Spin, quadrupole moment, and deformation of the magnetic-rotational band head in Pb-193

Abstract : he spectroscopic quadrupole moment of the T-1/2 = 9.4(5) ns isomer in Pb-193 at an excitation energy E-ex = (2585 + x) keV is measured by the time-differential perturbed angular distribution method as vertical bar Q(s)vertical bar = 2.6(3) e b. Spin and parity I-pi = 27/2(-) are assigned to it based on angular distribution measurements. This state is the band head of a magnetic-rotational band, described by the coupling of a neutron hole in the 1i(13/2) subshell with the (3s(1/2)(-2)1h(9/2)1i(13/2))(11-) proton excitation. The pairing-plus-quadrupole tilted-axis cranking calculations reproduce the measured quadrupole moment with a moderate oblate deformation epsilon(2) = -0.11, similar to that of the 11(-)proton intruder states, which occur in the even-even Pb nuclei in the region. This is the first direct measurement of a quadrupole moment and thus of the deformation of a magnetic-rotational band head.
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http://hal.in2p3.fr/in2p3-00570269
Contributor : Christine Hadrossek <>
Submitted on : Monday, February 28, 2011 - 10:57:52 AM
Last modification on : Monday, November 16, 2020 - 12:54:04 PM

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D.L. Balabanski, M. Ionescu-Bujor, A. Iordachescu, D. Bazzacco, F. Brandolini, et al.. Spin, quadrupole moment, and deformation of the magnetic-rotational band head in Pb-193. Physical Review C, American Physical Society, 2011, 83, pp.014304. ⟨10.1103/PhysRevC.83.014304⟩. ⟨in2p3-00570269⟩

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