Selected Aspects of the Octupole Degree of Freedom


Семинар «Теория ядра»

Дата и время: понедельник, 13 августа 2018 г., в 15:30

Место: Конференц-зал (2-й этаж), Лаборатория теоретической физики им. Н.Н. Боголюбова

Тема семинара: «Selected Aspects of the Octupole Degree of Freedom»

Докладчик: Marcus Scheck (University of the West of Scotland)


The talk will introduce the physics of strongly octupole correlated nuclei and the related observable. The experimental technique of Coulomb excitation, which is the standard method to measure E3 excitation strength is elucidated and results from a previous campaign at REX-ISOLDE (CERN) are presented. Furthermore, a new technique to measure E3 transition strength based on the observation of weak γ-ray branches employing modern highly-efficient detector arrays is introduced. The REX-ISOLDE results highlight the relation between quadrupole-octupole coupling and an intrinsic electric dipole moment, which in the laboratory frame results in a CP-violating Schiff moment. For the octupole correlated odd-mass nuclei characteristic parity doublets are explained and the idea of Mössbauer spectroscopy to measure the Schiff moment in the Jπ = 3/2± parity doublet of 227Ac is presented. The talk will conclude with a short summary about very recent Coulomb-excitation measurements in the A ≈ 144 and A ≈ 224 mass regions at HIE-ISOLDE (CERN) and an outlook about future experimental activities is provided.