[Triumf-seminars] TRIUMF Colloquium today at 14:00

TRIUMF Seminars triumf-seminars at lists.triumf.ca
Thu Jun 4 05:00:00 PDT 2020


Date/Time: Thu 2020-06-04 at 14:00

Location:  Virtual Colloq      

Speaker:   Mathis Wiedeking (iThemba LABS)

Title:     Electromagnetic response of nuclei: Constraining nucleosynthesis processes

Abstract: Virtual colloquium- details are posted below.

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iThemba LABS has embarked on an extensive renewal program with the ultimate goal to provide the users with competitive and state-of-the air research facilities for nuclear physics experiments. In particular, significant developments on the high-energy neutron beam facility, the K600 magnetic spectrometer and the ALBA (large-volume LaBr3:Ce detectors)  and AFRODITE (HPGe Clover+BGO detectors) gamma-ray arrays have taken place. These greatly improve and make possible new measurements of nuclear properties which are of relevance to nuclear structure or nucleosynthesis. For instance, the development of the inverse-Oslo method [1] at iThemba LABS to extract the photon strength function (PSF) and nuclear level density (NLD) from inverse kinematic reactions allows for the study of statistical properties for a wide range of nuclei, which were previously inaccessible at stable or radioactive ion beam facilities. Several such inverse kinematic PSF and NLD measurements have already been performed at iThemba LABS and HIE-ISOLDE at CERN. Furthermore, measurements of the PSF and NLD at the University of Oslo have recently provided new constraints on the nucleosynthesis of the p-nuclei 138La [2] and 180Ta [3]. 

In this presentation, I will provide a brief overview of our experimental capabilities at iThemba LABS. I will further introduce the concept of PSF and NLD and highlight its relevance to nuclear structure and astrophysics before discussing our work on 138La and 180Ta p-nuclei and how these are used to constrain reaction rates during p- and s-process nucleosynthesis. 

[1] VW Ingeberg et al., Eur. Phys. J. A 56, 68 (2020).
[2] BV Kheswa et al., Phys. Lett. B 744, 268 (2015).
[3] KL Malatji et al., Phys. Lett. B 791, 403 (2019).

This work is supported by the National Research Foundation of South Africa under grant number 118840 and the IAEA under contract 20454.
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Meeting ID: 326 593 778




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