ISOLDE Workshop and Users meeting 2015

Mass measurements of isomeric states in neutron-deficient 195,197Po isotopes at ISOLTRAP

2 Dec 2015, 18:20

2h

61/1-201 - Pas perdus - Not a meeting room - (CERN)

Poster Poster Session

Speaker

Numa Abdulmaeen S Althubiti (University of Manchester (GB))

Description

In this work neutron-deficient isotopes 195(g,m)Po and 197(g,m)Po have been investigated by using high-precision Penning-trap mass spectrometry at ISOLTRAP [1]. In addition, decay measurements on these isotopes were performed with the assistance of ISOLTRAP’s multi-reflection time-of-flight mass spectrometer (MR-TOF MS) [2], which successfully enabled us to deliver an isobarically pure beam [2] to the decay point, while the resonant ionization laser ion source (RILIS) of ISOLDE was used to selectively enhance the isomer or the ground state [3] of the investigated isotopes. The mass values of (195,197)m,gPo were measured with high-precision Penning-trap mass spectrometry using the well-established TOF-ICR technique [4], from which we determined the excitation energy of the 13/2+ state in 195,197Po for the first time, completing the knowledge of the energy systematics in the region. With this new information, the masses of the isomeric states of lead, radon, and radium in this region can be obtained from α-decay chains. The relevance to shape coexistence in the neutron-deficient lead region will be discussed. References: [1] M. Mukherjee et al., ISOLTRAP: An on-line Penning trap for mass spectrometry on short-lived nuclides, Eur. Phys. J. A 35, 1-29 (2008). [2] R.N. Wolf et al., ISOLTRAP's multi-reflection time-of-flight mass separator/spectrometer, Int. J. Mass. Spectrom. 349-350, 123-133 (2013). [3] T.E. Cocolios et al., Structure of 191Pb from α- and β-decay spectroscopy, J. Phys. G 37, 125103 (2010). [4] M. König et al., Int. J. Mass Spectrom. 142, 95 (1995).