SAIP2012

Investigation of the 11.16 MeV state of ¹²C

12 Jul 2012, 16:00

20m

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

Speaker

Mr fhumulani nemulodi (university of stellenbosch)

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

PhD

Abstract content <br> &nbsp; (Max 300 words)

For many years there has been a question mark over the existence of the 11.16 MeV state in ¹²C which is listed in the NNDC database. This state was assumed to be a candidate for the 2+ excited state of the famous Hoyle state (the second 0+ state in ¹²C). However, this state was only reported once in 1971, with no other measurements supporting the existence of such a state in ¹²C. Positive identification of the 2+ excited state of the Hoyle state has attracted much interest since the publication of (alpha, alpha') data by Itoh et al. in 2004. This measurement, along with other more recent experiments, show evidence of the existence of a 2+ state in ¹²C around 10 MeV.

With interest in locating the 2+ alpha cluster state growing rapidly, it was considered important to perform an experiment, with improved equipment and analysis techniques available today, to provide answers regarding the existence of the 11.16 MeV state. An experiment was performed at iThemba LABS with the high energy resolution K600 magnetic spectrometer to investigate the ¹¹B (³He,d) ¹²C reaction for an incident beam energy of 44 MeV. These experiment conditions mirrors those used in the 1971 study. Measurements were performed at the three spectrometer angles where a clear signature was reported in the previous measurement. The results from the recently completed data analysis will be presented.

Apply to be<br> consider for a student <br> &nbsp; award (Yes / No)?

yes

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

No

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

Dr. Paul Papka, papka@sun.ac.za, University of Stellembosch