Interaction position resolution simulations and in-beam measurements of the AGATA HPGe detectors

Söderström, P.-A.; Recchia, F.; Nyberg, J.; Al-Adili, Ali; Ataç, A.; Aydin, S.; Bazzacco, D.; Bednarczyk, P.; Birkenbach, B.; Bortolato, D.; Boston, Andrew; Boston, H. C.; Bruyneel, B.; Bucurescu, D.; Calore, Enrico; Colosimo, S.; Crespi, F. C. L.; Dosme, N.; Eberth, J.; Farnea, E.; Filmer, F.; Gadea, A.; Gottardo, A.; Grave, X.; Grȩbosz, J.; Griffiths, R.; Gulmini, M.; Habermann, T.; Hess, H.; Jaworski, G.; Jones, P.; Joshi, P. K.; Judson, D. S.; Kempley, R.S.; Khaplanov, A.; Legay, E.; Lersch, D.; Ljungvall, J.; Лопез-Мартенс, А.; Męczyński, W.; Mengoni, D.; Michelagnoli, C.; Molini, P.; Napoli, D. R.; Orlandi, R.; Pascovici, G.; Pullia, A.; Reiter, P.; Şahin, E.; Smith, J. F.; Strachan, J.; Tonev, D.; Unsworth, C.; Ur, C. A.; Valiente-Dobón, J. J.; Veyssiére, C.; Wiens, A.

doi:10.1016/j.nima.2011.02.089

Cited by 50 publications

(46 citation statements)

References 23 publications

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“…In such a way we extracted an averaged velocity vector of magnitude 0.046 (b) and components (0, 0.85, 0.51) in the AGATA frame of reference; the AGATA reference frame is a right handed reference frame where the z axis coincides with the optical axis of PRISMA (magnetic spectrometer of LNL-INFN lab) and the x axis points downward (see Refs. [15,36,56,57]). The components of the velocity vector are compatible with the beam direction.…”

Section: Doppler Correction Of 151 Mev Gamma-raysmentioning

confidence: 99%

“…It should be remarked that the individual interaction points are extracted with sub-segment precision, which experimentally turns out to be better than a three dimensional (3D) Gaussian with 5 mm FWHM in each direction (see for instance Refs. [33][34][35][36]). In order to achieve this goal, remarkable effort has been devoted to the characterization of highly-segmented HPGe detectors [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52], and the possibility to improve the performances of a gammaray spectrometer at high energies using accurate 3D position information was first proposed in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of the Advanced GAmma-ray Tracking Array (AGATA) detectors with in-beam tests were discussed in Ref. [33][34][35][36]. These studies, however, were limited to gamma-rays energies up to 4 MeV.…”

Section: Introductionmentioning

confidence: 99%

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

Crespi

Avigo

Camera

et al. 2013

Nuclear Instruments and Methods in Physics Research Section A:

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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.

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Section: Doppler Correction Of 151 Mev Gamma-raysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Crespi

Avigo

Camera

et al. 2013

Nuclear Instruments and Methods in Physics Research Section A:

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“…By using the grid search algorithm [26] for pulse shape analysis (PSA), the γ -ray interaction points were located in the Ge material with a resolution of about 5 mm at 1 MeV [27,28]. The energies of γ rays were obtained by applying offline the Orsay Forward Tracking (OFT) γ -ray tracking algorithm [29].…”

Section: Introductionmentioning

confidence: 99%

Neutron effective single-particle energies above Ni78 : A hint from lifetime measurements in the N=51 isotones

Didierjean¹,

Verney²,

Duchêne³

et al. 2017

Phys. Rev. C

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Background: While the N = 50 shell-gap evolution towards 78 Ni is presently in the focus of nuclear structure research, experimental information on the neutron effective single-particle energy sequence above the 78 Ni core remain scarce. Direct nucleon-exchange reactions are indeed difficult with presently available post-accelerated radioactive-ion beams (especially for high orbital-momentum orbitals) in this exotic region. Purpose: In this study we probe the evolution of the ν1g 7/2 effective single-particle energy which is a key to understanding the possible evolution of the spin-orbit splitting due to the proton-neutron interaction in the 78 Ni region. To achieve this goal, a method based on lifetime measurements is used for the first time. The obtained lifetimes of the 7/2 + 1 states in 87 Kr and 85 Se are used to investigate the ν1g 7/2 evolution. Method: Yrast and near-yrast states in the light N = 51 isotones 85 Se and 87 Kr were populated via multinucleon transfer reactions, using a 82 Se beam and a 238 U target at the LNL tandem-ALPI facility. The prompt γ rays were detected by the AGATA Demonstrator and particle identification was performed using the PRISMA spectrometer. Lifetime measurements were performed by using the Cologne plunger device for deep inelastic reactions and the Recoil Distance Doppler Shift technique. Results: We obtain τ (7/2 + 1 ) = 0.4 +1.6 −0.4 ps for 87 Kr. In the case of 85 Se an upper limit of 3(2) ps is obtained for the τ 7/2 + 1 value. Conclusion: For 87 Kr, the measured (7/2 + 1 ) lifetime is consistent with a core-coupled 2 + ⊗ ν2d 5/2 configuration for this state. This result is consistent with that obtained by direct reaction, which validates our method. For 85 Se, the measured 7/2 + 1 lifetime limit indicates a very small contribution of the ν1g 7/2 configuration to the wave function of this state.

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“…On this purpose, the digitally recorded waveforms from highlysegmented HPGe detectors are treated with Pulse-Shape-Analysis (PSA) techniques in order to extract the position of the interaction points in the detector with a 4 mm position resolution (at 1 MeV) [3,4]. These interaction points (hits) are grouped in events on the basis of the timestamp.…”

Section: Introductionmentioning

confidence: 99%