Change in structure between the $I = 1/2$ states in $^{181}$Tl and $^{177,179}$Au

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Change in structure between the $I = 1/2$ states in $^{181}$Tl and $^{177,179}$Au

T. Day Goodacre T. Day Goodacre Robert Wolf A. De Roubin S. Sels V. Liberati Lutz Schweikhard Andrei Andreyev Andrei Andreyev Andrei Andreyev Nobuaki Imai M. D. Seliverstov Liam Gaffney D. Lunney V. L. Truesdale L. Ghys Rafael Ferrer M. Venhart A. Gredley Klaus Blaum F. Wearing B. Andel N. A. Althubiti Susanne Kreim Susanne Kreim Y. Martinez Palenzuela P. L. Molkanov Frank Wienholtz D. A. Fink J. G. Cubiss J. G. Cubiss A. Welker A. Welker K. Sandhu Kai Zuber E. Rapisarda E. Rapisarda M. Veinhard Ulli Köster Marco Rosenbusch Dinko Atanasov Robert Page G. J. Farooq-smith G. J. Farooq-smith C. Van Beveren A. E. Barzakh P. Spagnoletti R. D. Harding R. D. Harding P. Mosat Mark Huyse F. Herfurth Kara Marie Lynch Kara Marie Lynch D. Neidherr T.j. Procter T.j. Procter S. Antalic P. Van Duppen V. N. Fedosseev D. V. Fedorov R. P. De Groote S.g. Zemlyanoy Sebastian Rothe Sebastian Rothe Thomas Elias Cocolios Thomas Elias Cocolios Thomas Elias Cocolios M. Al Monthery Vladimir Manea Vladimir Manea D. T. Joss G. G. O'neill M. Veselský B. A. Marsh

subject

Nuclear and High Energy Physics Hadron Nuclear physics Thallium nuclei [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciences 0103 physical sciences ddc:530 Nuclear Physics - Experiment Laser spectroscopy 010306 general physics Spin (physics)Physics Magnetic moment 010308 nuclear & particles physics Branching fraction Landé g-factor Gold nuclei Decay spectroscopy lcsh:QC1-999 3. Good health Nuclear deformation Präzisionsexperimente - Abteilung Blaum Atomic physics Ground state Nucleon lcsh:Physics Dimensionless quantity

description

Abstract The first accurate measurements of the α-decay branching ratio and half-life of the I π = 1 / 2 + ground state in 181Tl have been made, along with the first determination of the magnetic moments and I = 1 / 2 spin assignments of the ground states in 177,179Au. The results are discussed within the complementary systematics of the reduced α-decay widths and nuclear g factors of low-lying, I π = 1 / 2 + states in the neutron-deficient lead region. The findings shed light on the unexpected hindrance of the 1 / 2 + → 1 / 2 + , 181Tl → g 177 Aug α decay, which is explained by a mixing of π 3 s 1 / 2 and π 2 d 3 / 2 configurations in 177Aug, whilst 181Tlg remains a near-pure π 3 s 1 / 2 . This conclusion is inferred from the g factor of 177Aug which has an intermediate value between those of π 3 s 1 / 2 and π 2 d 3 / 2 states. A similar mixed configuration is proposed for the I π = 1 / 2 + ground state of 179Au. This mixing may provide evidence for triaxial shapes in the ground states in these nuclei.

year	journal	country	edition	language
2018-11-10

10.1016/j.physletb.2018.10.005 https://hal.archives-ouvertes.fr/hal-01914550