Silicon vertex tracker design simulations for in-beam spectroscopy with GRETA
ORAL
Abstract
The Gamma-Ray Energy Tracking Array (GRETA) has been developed to study exotic nuclei at the extremes of stability by exploring structural degrees of freedom such as single-particle behaviour, pairing interactions and nuclear deformation.
The facility for Rare Isotope Beams (FRIB) will provide unprecedented intensities of radioactive beams for in-beam spectroscopy experiments with GRETA using secondary reaction targets.
The reaction rate achievable with thick targets is in competition with the precision with which nuclear structure observables can be extracted from detected gamma-rays due to energy and angular straggling encountered by the ions that emit them in the target volume.
A LH2 target cell is under development at LBL to extend the reach of FRIB experiments in (p,p’) scattering and (p,2p) knockout reactions with exotic beams. A surrounding silicon tracker array will reconstruct reaction vertices from the tracks left in them by scattered protons.
In this talk design simulations of this tracker are presented, focused on optimising detection efficiency and longitudinal vertex precision within the geometrically challenging constraints of the enclosed GRETA target region.
Simulations of tracker and LH2 target performance in a hypothetical FRIB in-beam spectroscopy experiment are presented and are compared to that achieved with a more conventional thin target setup, demonstrating the advantages of the LH2 target and tracker.
The facility for Rare Isotope Beams (FRIB) will provide unprecedented intensities of radioactive beams for in-beam spectroscopy experiments with GRETA using secondary reaction targets.
The reaction rate achievable with thick targets is in competition with the precision with which nuclear structure observables can be extracted from detected gamma-rays due to energy and angular straggling encountered by the ions that emit them in the target volume.
A LH2 target cell is under development at LBL to extend the reach of FRIB experiments in (p,p’) scattering and (p,2p) knockout reactions with exotic beams. A surrounding silicon tracker array will reconstruct reaction vertices from the tracks left in them by scattered protons.
In this talk design simulations of this tracker are presented, focused on optimising detection efficiency and longitudinal vertex precision within the geometrically challenging constraints of the enclosed GRETA target region.
Simulations of tracker and LH2 target performance in a hypothetical FRIB in-beam spectroscopy experiment are presented and are compared to that achieved with a more conventional thin target setup, demonstrating the advantages of the LH2 target and tracker.
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Presenters
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Michael Armstrong
Authors
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Michael Armstrong
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Heather L Crawford
Lawrence Berkeley National Laboratory