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May 13 – 17, 2019
Venice, Centro Culturale Don Orione Artigianelli
Europe/Rome timezone
NSD2019 Proceedings are now available online at www.epj-conferences.org

Dipole Bands in 196Hg

Not scheduled
15m
SALA PALLADIO (Centro Culturale Don Orione Artigianelli)

SALA PALLADIO

Centro Culturale Don Orione Artigianelli

Speaker

J.J. Lawrie (iThemba LABS, National Research Foundation, Somerset West 7129, South Africa)

Description

In previous studies dipole bands were observed in a number of even Hg isotopes, including 196Hg where one dipole band was found [1]. In an experiment at iThemba LABS we observed both this and a second dipole band in 196Hg and could make an unambiguous spin and parity assignments from DCO and polarization measurements.
The experiment was performed using the AFRODITE array that consisted of 7 suppressed clover detectors. 196Hg was populated in the 194Pt (α,6n) reaction at 65 MeV using a thin (0.2 mg/cm2) target. The decay scheme obtained from a study of gamma-gamma coincidences generally confirms and extends the level scheme reported by Mehta et al. [2]. We extended the even spin negative parity structure beyond the band crossing and up to spin 24-. We also observed the dipole band reported by Cederwall et al [1], and managed to establish two decay paths out of this band, to the even- and odd-spin negative parity bands, thereby fixing the excitation energy, spin and parity (-) of this dipole band. A second dipole band that extends both above and below previously observed levels at 5351, 5617 and 5860 keV [2] was observed. DCO and polarization measurements on the transitions that depopulate this band towards a negative parity band fix the spin and parity (+). In addition, a second odd-spin negative parity band is extended beyond a band crossing up to a spin 19- level at 4877 keV, and three new positive parity bands are also observed.
A discussion on possible configurations as well as a comparison with bands in neighboring Hg isotopes will be presented.

[1] B. Cederwall et al., Phys. Rev. C 7(1993) R2443
[2] D. Mehta et al., Z. Phys. A 339(1991) 317

Primary authors

J.J. Lawrie (iThemba LABS, National Research Foundation, Somerset West 7129, South Africa) E.A. Lawrie (iThemba LABS, National Research Foundation, Somerset West 7129, South Africa) B. Msezane (iThemba LABS, National Research Foundation, Somerset West 7129, South Africa) M. Federke (Physics Department, University of Cape Town, Rondebosch 7700, South Africa) G.K. Mabala (iThemba LABS, National Research Foundation, Somerset West 7129, South Africa) S.M. Mullins (iThemba LABS, National Research Foundation, Somerset West 7129, South Africa) K.P. Mutshena (iThemba LABS, National Research Foundation, Somerset West 7129, South Africa) R.T. Newman (iThemba LABS, National Research Foundation, Somerset West 7129, South Africa) John F Sharpey-Schafer (University of Western Cape, South Africa) F.D. Smit (iThemba LABS, National Research Foundation, Somerset West 7129, South Africa) P. Vymers (iThemba LABS, National Research Foundation, Somerset West 7129, South Africa)

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