Response of AGATA segmented HPGe detectors to gamma rays up to 15.1MeV

Abstract

a b s t r a c tThe response of AGATA segmented HPGe detectors to gamma rays in the energy range 2-15 MeV was measured. The 15.1 MeV gamma rays were produced using the reaction d( 11 B,ng) 12C at E beam ¼ 19.1 MeV, while gamma rays between 2 and 9 MeV were produced using an Am-Be-Fe radioactive source. The energy resolution and linearity were studied and the energy-to-pulse-height conversion resulted to be linear within 0.05%.Experimental interaction multiplicity distributions are discussed and compared with the results of Geant4 simulations. It is shown that the application of gamma-ray tracking allows a suppression of background radiation caused by n-capture in Ge nuclei. Finally the Doppler correction for the 15.1 MeV gamma line, performed using the position information extracted with Pulse-shape analysis is discussed.

Isospin Character of Low-Lying Pygmy Dipole States inPb208via Inelastic Scattering ofOCrespi1, Bracco2, Nicolini3 et al. 2014Phys. Rev. Lett.Self Cite633260View full textAdd to dashboardCite

“…This γ-ray spectrum was unfolded according to the technique reported in Ref. [20], using the detector response function [21,22] and this resulted in the suppression of the first and second escape peaks and of most of the Compton contribution to the spectrum. The treatment of high-energy γ rays was performed according to [21], and the Doppler correction for the 208 Pb recoil velocity resulted in a resolution of 12 keVat 5.5 MeV.…”

Pygmy dipole resonance inCe140via inelastic scattering ofO17

“…The resulting solid angle for the Si telescope was 100 msr. The excitation of the target nucleus was followed by emission of γ rays measured by 5 triple clusters of high purity germanium (HPGe) detectors of the AGATA-Demonstrator array [21][22][23]. For the events from the AGATA-Demonstrator it was necessary to use advanced algorithms in order to fully profit from a good position resolution of the segmented Ge detectors.…”

“…For the events from the AGATA-Demonstrator it was necessary to use advanced algorithms in order to fully profit from a good position resolution of the segmented Ge detectors. At first, the Pulse Shape Analysis (PSA) [23] allowed to identify points of interaction of a γ ray scattering in the Ge crystals. Secondly, the reconstruction of the path of the γ rays inside the detector was performed with the tracking algorithm (MGT) [24].…”

Nuclear Structure Studies with the AGATA Array at Legnaro

“…In panels (a) and (b) of Fig. 5, the γ spectrum obtained with the AGATA array is displayed in the 4.5-8 MeV region before and after unfolding by the AGATA Demonstrator response [43], respectively. This spectrum is obtained by selecting the inelastically scattered 17 O events, with the additional requirement that the energy of the γ rays is equal to the Total Kinetic Energy Loss values within a window ±1.5 MeV wide.…”