7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Octupole Excitations in U isotopes

8 Jul 2014, 11:10
20m
D Les 101

D Les 101

Oral Presentation Track B - Nuclear, Particle and Radiation Physics NPRP

Speaker

Dr Sifiso Senzo Ntshangase (University of Zululand)

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

The actinide region attracts considerable interest due to the rich variety of octupole phenomena encountered both theoretically and experimentally [1]. These include octupole vibrational bands which, as a function of neutron number an angular momentum, develop into alternating parity bands that have been interpreted as the onset of octupole deformation, or more recently, in terms of refection-asymmetric tidal waves [2]. The most spectacular example of octupole shape may well be the hyperdeformed bands known from fission resonances.

A new possibility is the existence of the triaxial octupole shape, which in its purest form has a tetrahedral structure and is characterized by a zero quadrupole moment [3]. Thus negative parity bands in even-even nuclei with unobserved in-band E2 transitions are often regarded as candidates for the rotation of a tetrahedral shape. In the actinides, 230U and 232U fall in this category. These nuclei have been populated at iThemba LABS, using 232Th(,xn) reactions at 61 and 42 MeV, respectively. Here we report the results of these measurements, which include the first observation of in-band E2 transitions in the negative parity bands in these nuclei, using the AFRODITE array in conjunction with the iThemba LABS recoil detector. The results are discussed and compared to Skyrme-Hartree-Fock calculations and systematics throughout the region.
1. P.A. Butler and W Nazarewicz, Rev. Mod. Phys. 68, 349 (1996).
2. W. Reviol et al., Phys. Rev. C 74, 044305 (2006).
3. J. Dudek et al, Phys. Rev. Lett. 88, 252502 (2002).

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Main supervisor (name and email)<br>and his / her institution

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Primary author

Dr Sifiso Senzo Ntshangase (University of Zululand)

Co-authors

Dr Barna Nyako (ATOMKI, Hungary) Dr David Roux (Rhodes) Dr Elena Lawrie (iThemba LABS) Prof. John F Sharpey-Schafer (UWC) Dr Kobus Lawrie (iThemba LABS) Dr Paul Papka (Stellenbosch University) Dr Robert Bark (iThemba LABS) Dr Simon Mullins (iThemba LABS (Gauteng)) Mr Siyabonga Majola (UCT/ iThemba Labs) Ms Suzan Phumudzo Bvumbi (University of Johannesburg)

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