10th Workshop on Nuclear Level Density and Gamma Strength

Indirect measurement of the $^{132}$I(n,$\gamma$)$^{133}$I neutron-capture rate on the exotic $^{132}$I for the intermediate neutron-capture process

Not scheduled

20m

Auditorium 1 (Helga Engs Hus)

Oral Midday Session

Speaker

Claudia Grieg

Description

The nucleosynthesis of elements heavier than iron remains an open
question in nuclear astrophysics. In the last decade, the intermediate (i)
neutron-capture process has attracted attention as a potential explanation
for observed abundance patterns in for example the old halo stars in our
Galaxy, that cannot be reproduced by the slow and rapid processes. Un-
derstanding the i-process requires reliable neutron-capture reaction rates
for nuclei away from stability, which motivates the present work.
The work presents an experimental study performed at the Oslo Cy-
clotron Laboratory (OCL) where a 130Te target was irradiated by an alpha
beam to populate excited states in 133I through the 130Te(α, pγ)133I re-
action. The emitted protons and γ rays are measured by the SiRi and
OSCAR detectors. By applying the Oslo method on the particle-gamma
coincidence data, the nuclear level density and gamma-ray strength func-
tion of 133I is extracted and used as input to nuclear reaction codes like
TALYS to provide astrophysical reaction rates on the radiative neutron-
capture reaction 132I(n, γ)133I of importance for the i process.