Speaker
Dr
Filip Kondev
(Argonne National Laboratory)
Description
Properties of deformed, neutron-rich nuclei in the A~160 region are important for achieving a better understanding of the nuclear structure in this region where little is known owing to difficulties in the production of these nuclei at the present RIB facilities. These properties are essential ingredients in the interpretation of the rare-earth peak at A~160 in the r-process abundance distribution, since various theoretical models depend sensitively on the nuclear structure input. Predicated on these ideas, we have initiated a new experimental program at Argonne National Laboratory. The first experiment recently took place where a combination of the CARIBU radioactive beam facility with the new SATURN decay station and the X-array clover array was performed. We focused initially on several odd-odd nuclei, where decays of both the ground state and an excited isomer were investigated. Because of the spin difference, a variety of structures in the daughter nuclei were selectively populated and characterized based on their decay properties. Results from these studies will be presented, including the first identification of beta-decaying isomers in both 160Eu and 162Eu, together with predictions using multi-quasiparticle blocking calculations that include the effect of the residual nucleon-nucleon interactions. Mass measurements using the Canadian Penning Trap aimed at measuring the excitation energy of the beta-decaying isomers were also carried out and new results will be also reported.
*This research is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contract No. DE-AC02-06CH11357 (ANL) and by the National Science Foundation under Grant No. PHY-1502092 (USNA). This research used resources of ANL's ATLAS facility, which is a DOE Office of Science User Facility.
Primary author
Dr
Filip Kondev
(Argonne National Laboratory)
Co-authors
Dr
Akaa Ayangeakaa
(Argonne National Laboratory)
Dr
Calem Hoffman
(Argonne National Laboratory)
Mr
Chaoliang Hu
(Zhejiang University)
Prof.
Daryl Hartley
(United States Naval Academy)
Prof.
Guy Savard Savard
(Argonne National Laboratory)
Mr
Haowei Zhang
(Zhejiang University)
Dr
Jasmine Sethi
(Argonne National Laboratory & University of Maryland)
Jason Clark
(Argonne National Laboratory)
Dr
Michael Carpenter
(Argonne National Laboratory)
Mr
Patrick Copp
(University of Massachusetts Lowell)
Dr
Robert Janssens
(Argonne National Laboratory)
Rodney Orford
(McGill University)
Dr
Shaofei Zhu
(Argonne National Laboratory)
Dr
Simone Bottoni
(Argonne National Laboratory)
Dr
Torben Lauritsen
(Argonne National Laboratory)
Mr
Yijie Zhu
(Zhejiang University)