[RIBF-ULIC-Symposium-007] E(U)RICA International Workshop

Decay Spectroscopy of 110Zr

Not scheduled

RIBF Building 2F Conference Room (RIKEN Nishina Center)

Speaker

Dr Javier Valiente Dobon (INFN Laboratori Nazionali di Legnaro)

Description

Several theoretical studies based on the concept of the mean field, Woods-Saxon, Strutinsky and Hartree-Fock have predicted tetrahedral symmetry in nuclei. Tetrahedral symmetry leads to a tetrahedron shape which would be the most symmetric shape in nuclei to be discovered. Although some evidences for such structures have been found no conclusive proof has yet been provided for their existence. This LOI aims to investigate their existence, setting much more precise limitations for the relevant observables. 110Zr is one of the best predicted examples of doubly magic tetrahedral deformed nucleus. Prolate, Oblate and tetrahedral states have been predicted in the neutron rich Zr nuclei based on different mean field approaches. Also the formation of subshell gaps at N=64 and 80 have been foreseen. We propose to search for the existence of low lying isomeric states in 110Zr. Excitation energy and lifetime information will be used to compare with the results of different theoretical models. We propose to populate isomeric states in the neutron rich Zr nuclei using the induced fission reactions of a 238U beam accelerated at the RIKEN facility. The E(U)RIKA setup in the stopped beam configuration will be used for detecting the gamma decays. The first stage of the BigRIPS separator will be used to collect and separate the fission fragments while the second stage will be used as a spectrometer for particle identification. Assuming a primary beam intensity of 0.22 pnA, an isomeric ratio of about 5% ( estimated on the basis of the expected excitation energy of such states ~ 1.5 MeV) and 8 days of beam time we expect for 110Zr 103 cunts in the gamma peaks deexciting the isomers.