Speaker
Dr
Dario Lattuada
(IFIN-HH/ELI-NP)
Description
Photonuclear reactions at threshold energies are of great
interest in nuclear astrophysics.
At the Extreme Light Infrastructure - Nuclear Physics (ELI-NP[1])
we are currently developing a new silicon-strip detector array
(ELISSA, ELI Silicon Strip Array) to be used with
the Gamma Beam System (GBS) that is being installed and will be operational in 2019. The ELI-NP GBS will provide beams in the range between
200 keV and 19.5 MeV with a bandwidth better than 0.5$\%$,
spectral density of about 10$^{4}$ photons/(eV·s) and linear
polarization higher than 95$\%$.
ELISSA is an almost 4$\pi$ array made by 35 Micron X3 position sensitive silicon
detectors in a barrel configuration and 8 Micrion QQQ3 double-sided silicon
detectors as end-caps, which grant very good
energy (better than 1$\%$) and position (1-2mm) resolutions.
Such combined performances will allow the
measurement of controversial reaction cross-sections, such as
$^{12}$C($\alpha$,$\gamma$)$^{16}$O through the inverse $^{16}$O
photo-disintegration, $^{24}$Mg($\alpha$,$\gamma$)$^{20}$Ne
and many other photodissociation processes relevant to stellar evolution and
nucleosynthesis[1].
The physics cases of interest for ELISSA
with emphasis of the considered day-one experiments and the
results of the tests that were performed so far are discussed.
Also, the Monte Carlo tool based on GEANT4[2] and ROOT[3]
that is being developed for the study of
photonuclear reactions at ELI-NP will be introduced. Finally the results from
the simulations performed in order to evaluate the reaction rates, the
effects of the straggling of the exit particles due to the thickness of
the target and of the resolution of the silicon detectors in
photonuclear experiments will be shown.
[1] D. Filipescu et al., Eur. Phys. J., A51, 185 (2015).\newline
[2] GEANT4: A Simulation toolkit - GEANT4 Collaboration (Agostinelli, S. et al.), Nucl.Instrum.Meth. A506 (2003) 250-303 SLAC-PUB-9350, FERMILAB-PUB-03-339.
[3] ROOT - An Object Oriented Data Analysis Framework - Rene Brun and Fons Rademakers, Proceedings AIHENP'96 Workshop, Lausanne, Sep. 1996, Nucl. Inst. \& Meth. in Phys. Res. A 389 (1997) 81-86. See also http://root.cern.ch/.
Primary author
Dr
Dario Lattuada
(IFIN-HH/ELI-NP)
