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Electromagnetic properties of low-lying states in neutron-deficient Hg isotopes: Coulomb excitation of Hg-182, Hg-184, Hg-186 and Hg-188

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Fraile Prieto, Luis Mario and otros, ... (2019) Electromagnetic properties of low-lying states in neutron-deficient Hg isotopes: Coulomb excitation of Hg-182, Hg-184, Hg-186 and Hg-188. European physical journal A, 55 (8). ISSN 1434-6001

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Official URL: http://dx.doi.org/10.1140/epja/i2019-12815-2


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Abstract

The neutron-deficient mercury isotopes serve as a classical example of shape coexistence, whereby at low energy near-degenerate nuclear states characterized by different shapes appear. The electromagnetic structure of even-mass 182-188 Hg isotopes was studied using safe-energy Coulomb excitation of neutron-deficient mercury beams delivered by the REX-ISOLDE facility at CERN. The population of 0 + 1,2, 2(1,2)(+) and 4(1)(+) states was observed in all nuclei under study. Reduced E2 matrix elements coupling populated yrast and non-yrast states were extracted, including their relative signs. These are a sensitive probe of shape coexistence and may be used to validate nuclear models. The experimental results are discussed in terms of mixing of two different configurations and are compared with three different model calculations: the Beyond Mean Field model, the Interacting Boson Model with configuration mixing and the General Bohr Hamiltonian. Partial agreement with experiment was observed, hinting to missing ingredients in the theoretical descriptions.


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© The Author(s) 2019. This article is published with open access at Springerlink.com. Artículo firmado por 70 autores. The authors would like to thank the ISOLDE facility for providing excellent beams. This work was performed within the Polish-Belgian joint research project under the FWOPAS agreement on scientific cooperation (FWO contract no. VS. 084.16N). This work was supported by GOA/2010/010 (BOF KULeuven), by the IAP Belgian Science Policy (BriX network P6/23 and P7/12), by the European Commission within the 7th Framework Programme through I3ENSAR (contract no. RII3-CT-2010-262010), by the National Science Centre, Poland, grant no. 2015/18/M/ST2/00523, by the U. K. Science and Technology Facilities Council grants PP/F000898/1, ST/FO12039/1, ST/J000094/1, ST/L005670/1 and ST/R004056/1 by the German BMBF under contracts No. 06DA9036I, 05P12RDCIA 06KY205I, 05P09PKCI5, 05P12PKFNE, 05P12WOFNF, 09MT9156, 05P15PKCIA and "Verbundprojekt 05P2015", Academy of Finland (Contract No. 131665), by the Spanish MINECO through FPA2015-65035-P project and the Spanish Project No. FIS2014-53448-C2-2, by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract No. DE-AC02-06CH11357. LP gratefully acknowledges support from the Polish National Science Center (NCN), grant no. 2013/10/M/ST2/00427. LPG acknowledges support from the FWO-Vlaanderen (Belgium) via an FWO Pegasus Marie Curie Fellowship. ACL gratefully acknowledges funding through ERC-STG-2014, grant agreement no. 637686.

Uncontrolled Keywords:Electric-monopole transitions; Shape coexistence; Deformed bands; Nuclear; Configuration; Decay; Lifetimes; Isomerism; Intruder; Moments
Subjects:Sciences > Physics > Nuclear physics
ID Code:58004
Deposited On:05 Dec 2019 13:22
Last Modified:10 Dec 2019 08:47

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