Quadrupole moments and $g$ factors for high-spin neutron isomers in $^{193}\mathrm{Pb}$

Quadrupole moments and $g$ factors for high-spin neutron isomers in ${}^{193}{Pb}$

M. Ionescu-Bujor, A. Iordachescu, D. L. Balabanski, S. Chmel, G. Neyens, G. Baldsiefen, D. Bazzacco, F. Brandolini, D. Bucurescu, M. Danchev, M. De Poli, G. Georgiev, A. Görgen, H. Haas, H. Hübel, G. Ilie, N. Marginean, R. Menegazzo, P. Pavan, G. Rainovski, R. V. Ribas, C. Rossi Alvarez, C. A. Ur, K. Vyvey, and S. Frauendorf

Phys. Rev. C 70, 034305 – Published 15 September 2004

Abstract

The $g$ factors and quadrupole moments of the $21 ∕ 2^{-}$ and $33 ∕ 2^{+}$ isomers in ${}^{193}{Pb}$ have been measured by the time-differential perturbed $γ$ -ray angular distribution method as $g (21 ∕ 2^{-}) = - 0.059 (11)$ , $∣ Q (21 ∕ 2^{-}) ∣ = 0.22 (2) e b$ and $g (33 ∕ 2^{+}) = - 0.171 (9)$ , $∣ Q (33 ∕ 2^{+}) ∣ = 0.45 (4) e b$ . The results support the three-neutron configurations ${(1 i_{13 ∕ 2})}_{12^{+}}^{2} \otimes 3 p_{3 ∕ 2}$ and ${(1 i_{13 ∕ 2})}^{3}$ for the $21 ∕ 2^{-}$ and $33 ∕ 2^{+}$ states, respectively. The quadrupole moment of the $12^{+}$ isomer in ${}^{194}{Pb}$ described by the two-neutron ${(1 i_{13 ∕ 2})}^{2}$ configuration has been remeasured as $∣ Q (12^{+}) ∣ = 0.48 (3) e b$ in perfect agreement with the previous data. The experimental results are discussed within a microscopic Bardeen-Cooper-Schrieffer approach in a number-projected one- and three-quasiparticle neutron space, and in the frame of the pairing plus quadrupole tilted-axis cranking model.

Received 20 May 2004

DOI:https://doi.org/10.1103/PhysRevC.70.034305

Authors & Affiliations

M. Ionescu-Bujor¹, A. Iordachescu¹, D. L. Balabanski^2,3, S. Chmel⁴, G. Neyens², G. Baldsiefen⁴, D. Bazzacco⁵, F. Brandolini⁵, D. Bucurescu¹, M. Danchev³, M. De Poli⁶, G. Georgiev⁷, A. Görgen⁴, H. Haas⁸, H. Hübel⁴, G. Ilie^1,9, N. Marginean^1,6, R. Menegazzo⁵, P. Pavan⁵, G. Rainovski^3,10, R. V. Ribas¹¹, C. Rossi Alvarez⁵, C. A. Ur^1,5, K. Vyvey², and S. Frauendorf^12,13

¹National Institute for Physics and Nuclear Engineering, Bucharest, Romania
²IKS, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
³Faculty of Physics, St. Kliment Ohridski University of Sofia, BG-1164 Sofia, Bulgaria
⁴Helmholtz-Institute für Strahlen- und Kernphysik, Universität Bonn, Germany
⁵Dipartimento di Fisica dell’ Universitá and INFN, Sezione di Padova, Padova, Italy
⁶INFN, Laboratori Nazionali di Legnaro, Legnaro, Italy
⁷Grand Accélérateur National d’Ions Lourds, F-14076 Caen Cedex 5, France
⁸Hahn-Meitner Institut, Bereich Festkorperphysik, D-14109 Berlin, Germany
⁹Faculty of Physics, University of Bucharest, Romania
¹⁰Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
¹¹Instituto de Fisica, Universidade de São Paulo, São Paulo, Brasil
¹²Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, D-01314 Dresden, Germany
¹³Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA

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Vol. 70, Iss. 3 — September 2004

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Physical Review C

covering nuclear physics

Quadrupole moments and $g$ factors for high-spin neutron isomers in ${}^{193}{Pb}$

Phys. Rev. C 70, 034305 – Published 15 September 2004

Abstract

Authors & Affiliations

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Physical Review C

covering nuclear physics

Quadrupole moments and g factors for high-spin neutron isomers in Pb193

Phys. Rev. C 70, 034305 – Published 15 September 2004

Abstract

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Quadrupole moments and $g$ factors for high-spin neutron isomers in ${}^{193}{Pb}$