Response function and linearity for high energy <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="mml31" display="inline" overflow="scroll" altimg="si2.gif"><mml:mi>γ</mml:mi></mml:math>-rays in large volume LaBr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="mml32" display="inline" overflow="scroll" altimg="si32.gif"><mml:msub><mml:mrow/><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:math>:Ce detectors

Gosta, G.; Blasi, N.; Camera, F.; Million, B.; Giaz, A.; Wieland, O.; Rossi, Fabiana; Utsunomiya, H.; Ariizumi, Takashi; Takenaka, Daiki; Filipescu, D.; Gheorghe, I.

doi:10.1016/j.nima.2017.10.018

Cited by 23 publications

(6 citation statements)

References 26 publications

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“…The efficiency was 0.90% at 1.836 MeV (measured by using a 88 Y source), a value reproduced within 2.0% by a Monte Carlo simulation for this experiment obtained by using the code GEANT4 [23]. At higher energies the efficiency was measured with different radioactive sources and high-energy γ -ray beams [24]. The time resolution of the LaBr 3 :Ce detectors was 1 ns (FWHM) for in-beam events, and this allowed us to reject a large fraction of background events.…”

Section: Methodssupporting

confidence: 70%

Low-lying dipole response in the unstable Ni70 nucleus

Wieland¹,

Bracco²,

Camera³

et al. 2018

Phys. Rev. C

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The Coulomb excitation of the neutron-rich nucleus 70 Ni was measured in inverse kinematics at 260A MeV bombarding energy and with a 197 Au target. The beam energy allowed us to study the dipole response around the neutron separation energy (up to about 12 MeV). The experiment was performed at the RIKEN Radioactive Isotope Beam Factory (RIBF). The γ decay from the scattered 70 Ni ions at around zero degree was measured with a scintillator detection system composed of large volume LaBr 3 :Ce detectors (HECTOR + array) and NaI(Tl) detectors (DALI2 array). Results were obtained for the E1 strength in the region where the dipole response is characterized by the presence of the pygmy dipole resonance. The measured E1 strength is found to be larger as compared with that of 68 Ni below the neutron binding energy. The measured E1 strength as a function of energy is compared with available predictions based on relativistic and nonrelativistic approaches, and only in some cases does theory give a reasonable account of the data.

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Section: Methodssupporting

confidence: 70%

Low-lying dipole response in the unstable Ni70 nucleus

Wieland¹,

Bracco²,

Camera³

et al. 2018

Phys. Rev. C

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“…8 show the peak channel numbers before and after saturation obtained from the low-current data. It is noted that energy non-linearity was also reported for LaBr 3 (Ce) detectors with different PMTs [6].…”

Section: Multi-photon Spectra At 40 Mevmentioning

confidence: 64%

Photon-flux determination by the Poisson-fitting technique with quenching corrections

Utsunomiya

Watanabe

Ariizumi

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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Single-and multi-photon spectra of pulsed γ-ray beams produced at 17, 34, and 40 MeV in the laser Compton scattering were measured with an 8" × 12" NaI(Tl) detector. By using the experimental single-photon spectra as the probability function of generating random numbers, response functions of the NaI(Tl) detector to j-fold photons (j = 2, 3, 4 ...) were constructed. The least-square fits to the experimental multi-photon spectra by the Poisson distribution consisting of the response functions were made. The multi-photon spectra measured at 17 and 34 MeV follow the Poisson distribution. A quenching phenomenon of multi-photon spectra was observed for 40 MeV γ-rays as a result of the saturation at the photomultiplier tube of the NaI(Tl) detector. The original Poisson distributions were restored from the quenched spectra using a saturation curve

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“…Also, the predictable non-linearity of SiPMs, due to geometrical reasons, is a great advantage compared to PMTs. Indeed, the latter exhibit non-deterministic linearity, especially for high-energy γ-rays [27]. The pixelated nature of the detection surface allows the reconstruction of the γ-ray interaction point inside the crystal, thus the correction of the relativistic Doppler broadening.…”

Section: Discussionmentioning

confidence: 99%

A γ-Ray Detector Based on a 3” LaBr₃:Ce:Sr Crystal With SiPM Readout for 80 keV–16 MeV Energy Range With Position Sensitivity for Doppler Correction

Agnolin,

Di Vita,

Borghi

et al. 2023

IEEE Trans. Nucl. Sci.

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We report the validation in an extended energy range (80 keV -≃ 16 MeV) of the GAMMA detector, a highdynamic-range, high-resolution, gamma-ray spectrometer for nuclear physics applications based on a 3" co-doped lanthanum bromide (LaBr 3 :Ce:Sr) crystal (73 ph/keV conversion efficiency, 25 ns decay time) coupled to 144 NUV-HD Silicon Photomultipliers (SiPMs). The detector shows state-of-the-art energy resolution along the entire range thanks to the automatic gain switching feature (Adaptive Gain Control, AGC) of the custom ASICs employed in the system. To the best of our knowledge, this is the first time that SiPMs have been used to measure such high energy together with a wide dynamic range and excellent energy resolution (2.7% at 662 keV).In addition, the pixelated nature of the SiPMs detectors, combined with Machine Learning algorithms, can be exploited to reconstruct the position of the first interaction of the gamma rays inside the scintillation crystal. Previous measurements with a 137 Cs collimated source have achieved a spatial resolution better than 2 cm. This performance in position sensitivity has been used to compensate for the relativistic Doppler broadening effects of gamma rays at 15.110(3) MeV emitted by a carbon nucleus moving at relativistic speed (v/c ≃ 0.05) resulting from a boron-on-deuterium reaction, improving the FWHM resolution of the peak by 15%, which is in agreement with the theoretical expectation.

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Response function and linearity for high energy γ-rays in large volume LaBr3:Ce detectors

Cited by 23 publications

References 26 publications

Low-lying dipole response in the unstable Ni70 nucleus

Low-lying dipole response in the unstable Ni70 nucleus

Photon-flux determination by the Poisson-fitting technique with quenching corrections

A γ-Ray Detector Based on a 3” LaBr₃:Ce:Sr Crystal With SiPM Readout for 80 keV–16 MeV Energy Range With Position Sensitivity for Doppler Correction

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Response function and linearity for high energy γ-rays in large volume LaBr3:Ce detectors

Cited by 23 publications

References 26 publications

Low-lying dipole response in the unstable Ni70 nucleus

Low-lying dipole response in the unstable Ni70 nucleus

Photon-flux determination by the Poisson-fitting technique with quenching corrections

A γ-Ray Detector Based on a 3” LaBr3:Ce:Sr Crystal With SiPM Readout for 80 keV–16 MeV Energy Range With Position Sensitivity for Doppler Correction

Contact Info

Product

Resources

About

A γ-Ray Detector Based on a 3” LaBr₃:Ce:Sr Crystal With SiPM Readout for 80 keV–16 MeV Energy Range With Position Sensitivity for Doppler Correction