Abstract
In this contribution, further evidence of the importance of multiphonon-octupole excitations to describe experimental data in the rare earths and actinides will be presented. First, new results of a (p, t) experiment at the Q3D magnetic spectrograph in Munich will be discussed, which was performed to selectively excite Jπ = 0+ states in 240Pu. spdf interacting boson model (IBM) calculations suggest that the previously proposed double-octupole phonon nature of the Jπ = 0+2 state is not in conflict with its strong (p, t) population. Second, the framework of the IBM has been adopted for the description of experimental observables related to octupole excitations in the rare earths. Here, the IBM is able to describe the signature splitting for positiveand negative-parity states when multi-dipole and multi-octupole bosons are included. The present study might support the idea of octupole-phonon condensation at intermediate spin (Jπ = 10+) leading to the change in yrast structure observed in 146Nd.
Highlights
(b) the double-octupole nature of the excited Kπ = 0+ band in 240Pu
In the actinides a pairing-isomeric character [7, 8] was proposed because of the uniformly strong (p, t) population of the Jπ = 0+2 states [9, 10], see Fig. 1, and the comparably weak (t, p) population observed for some nuclei [7]
To further test the robustness of this theoretical approach, 146Nd has been studied with the interacting boson model (IBM) since a very interesting change in yrast structure is observed for positive- and negativeparity states [16]
Summary
EPJ Web of Conferences on a large number of monopole excitations in weakly and deformed rare earth and actinide nuclei by means of the (p, t) reaction, see e.g., [11,12,13] This new data allow to stringently test theoretical models, the nature of monopole excitations in nuclei, and the importance of including the octupole degree of freedom to describe these. In this conference proceeding, results from a 242Pu(p, t)240Pu experiment, obtained with the Q3D@MLL and already published in Ref. This observation will be discussed along the lines of the condensation of rotational-aligned octupole phonons proposed in [17]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
