Electromagnetic properties of low-lying states in neutron-deficient Hg isotopes; Coulomb excitation of Hg, Hg, Hg and Hg

中性子欠損水銀同位体の低励起エネルギー領域における電磁気的性質; Hg, Hg, Hg及びHgのクーロン励起

Wrzosek-Lipska, K.*; Rezynkina, K.*; Bree, N.*; Zieliska, M.*; Gaffney, L. P.*; Petts, A.*; Andreyev, A. N.; Bastin, B.*; Bender, M.*; Blazhev, A.*; Bruyneel, B.*; Butler, P. A.*; Carpenter, M. P.*; Cederkll, J.*; Clment, E.*; Cocolios, T. E.*; Daecon, A. N.*; Diriken, J.*; Ekstrm, A.*; Fitzpatrick, C.*; Fraile, L. M.*; Fransen, Ch.*; Freeman, S. J.*; Garca-Ramos, J. E.*; Geibel, K.*; Gernhuser, R.*; Grahn, T.*; Guttormsen, M.*; Hadinia, B.*; Hadyska-Klk, K.*; Hass, M.*; Heenen, P.-H.*; Herzberg, R.-D.*; Hess, H.*; Heyde, K.*; Huyse, M.*; Ivanov, O.*; Jenkins, D. G.*; Julin, R.*; Kesteloot, N.*; Krll, Th.*; Krcken, R.*; Larsen, A. C.*; Lutter, R.*; Marley, P.*; Napiorkowski, P. J.*; Orlandi, R.  ; Page, R. D.*; Pakarinen, J.*; Patronis, N.*; Peura, P. J.*; Piselli, E.*; Prchniak, L.*; Rahkila, P.*; Rapisarda, E.*; Reiter, P.*; Robinson, A. P.*; Scheck, M.*; Siem, S.*; Singh Chakkal, K.*; Smith, J. F.*; Srebrny, J.*; Stefanescu, I.*; Tveten, G. M.*; Van Duppen, P.*; Van De Walle, J.*; Voulot, D.*; Warr, N.*; Wiens, A.*; Wood, J. L.*

Wrzosek-Lipska, K.*; Rezynkina, K.*; Bree, N.*; Zieliska, M.*; Gaffney, L. P.*; Petts, A.*; Andreyev, A. N.; Bastin, B.*; Bender, M.*; Blazhev, A.*; Bruyneel, B.*; Butler, P. A.*; Carpenter, M. P.*; Cederkll, J.*; Clment, E.*; Cocolios, T. E.*; Daecon, A. N.*; Diriken, J.*; Ekstrm, A.*; Fitzpatrick, C.*; Fraile, L. M.*; Fransen, Ch.*; Freeman, S. J.*; Garca-Ramos, J. E.*; Geibel, K.*; Gernhuser, R.*; Grahn, T.*; Guttormsen, M.*; Hadinia, B.*; Hadyska-Klk, K.*; Hass, M.*; Heenen, P.-H.*; Herzberg, R.-D.*; Hess, H.*; Heyde, K.*; Huyse, M.*; Ivanov, O.*; Jenkins, D. G.*; Julin, R.*; Kesteloot, N.*; Krll, Th.*; Krcken, R.*; Larsen, A. C.*; Lutter, R.*; Marley, P.*; Napiorkowski, P. J.*; Orlandi, R.; Page, R. D.*; Pakarinen, J.*; Patronis, N.*; Peura, P. J.*; Piselli, E.*; Prchniak, L.*; Rahkila, P.*; Rapisarda, E.*; Reiter, P.*; Robinson, A. P.*; Scheck, M.*; Siem, S.*; Singh Chakkal, K.*; Smith, J. F.*; Srebrny, J.*; Stefanescu, I.*; Tveten, G. M.*; Van Duppen, P.*; Van De Walle, J.*; Voulot, D.*; Warr, N.*; Wiens, A.*; Wood, J. L.*

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 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, 2, and 4 states was observed in all nuclei under study. Reduced 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.