NeuLAND: The high-resolution neutron time-of-flight spectrometer for R3B at FAIR

Boretzky, K.; Gašparić, I.; Heil, M.; Mayer, J.; Heinz, A.; Caesar, C.; Kresan, D.; Simon, H.; Törnqvist, H.; Körper, D.; Alkhazov, G.; Atar, L.; Aumann, T.; Bemmerer, D.; Bondarev, S.V.; Bott, L.; Chakraborty, Sovan; Cherciu, M.; Chulkov, L. V.; Ciobanu, M.; Pramanik, U. Datta; Filippo, E. De; Douma, C. A.; Dreyer, J.; Elekes, Z.; Enders, J.; Galaviz, D.; Geraci, E.; Gnoffo, B.; Göbel, K.; Golovtsov, V.; Diaz, Daniel; Gruzinsky, N.; Heftrich, T.; Heggen, H.; Hehner, J.; Hensel, Thomas; Hoemann, E.; Holl, M.; Horvat, A.; Horváth, Ákos; Ickert, G.; Malenica, D. Jelavić; Johansson, H.; Jonson, B.; Kahlbow, J.; Kalantar‐Nayestanaki, N.; Kelić-Heil, A.; Kempe, M.; Koch, K.; Kozlenko, N.; Krivshich, A.; Kurz, N.; Kuznetsov, V.L.; Langer, C.; Leifels, Y.; Lihtar, I.; Löher, B.; Machado, J.; Martorana, N. S.; Miki, K.; Nilsson, T.; Orischin, E.M.; Pagano, E. V.; Pirrone, S.; Politi, G.; Potlog, P.; Rahaman, A.; Reifarth, R.; Rigollet, C.; Röder, M.; Rossi, D.; Russotto, P.; Savran, D.; Scheit, H.; Schindler, F.; Stach, D.; Stan, E.; Gill, J. Stomvall; Teubig, P.; Trimarchi, M.; Uvarov, L.; Volknandt, M.; Wagner, Andreas; Wagner, V.; Wranne, S.; Yakorev, D.; Zanetti, L.; Zilges, A.; Zuber, Κ.

doi:10.1016/j.nima.2021.165701

Cited by 33 publications

(16 citation statements)

References 57 publications

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“…Since for these studies one needs exotic beams at high kinetic energies ( 1.5A GeV), the best place to perform these experiments is the future FAIR facility [35] at Darmstadt (Germany), inserting, for instance, a TPC detector inside the large superconducting magnet GLAD [166]. In addition, neutron multiplicites would be measured with the highly segmented NeuLAND detector [167], allowing for complete kinematics measurements of all the reaction products.…”

Section: Discussionmentioning

confidence: 99%

Hypernuclei formation in spallation reactions by coupling the Liège intranuclear cascade model to the deexcitation code ABLA

Rodríguez-Sànchez

David²,

Hirtz³

et al. 2022

Phys. Rev. C

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Section: Discussionmentioning

confidence: 99%

Hypernuclei formation in spallation reactions by coupling the Liège intranuclear cascade model to the deexcitation code ABLA

Rodríguez-Sànchez

David²,

Hirtz³

et al. 2022

Phys. Rev. C

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“…Together with their charge and time-of-flight, measured by a hodoscope consisting of 24 plastic scintillator bars at the end of the beamline, this allowed to fully reconstruct the four-vectors of the fragments. Neutrons emitted in-flight were detected using the combination of the NeuLAND [22] demonstrator and NEB-ULA [23,24]. The NeuLAND demonstrator consisted of 400 plastic scintillator bars arranged in 4 double planes, with each double plane consisting of a horizontal and a vertical plane.…”

Section: Methodsmentioning

confidence: 99%

Border of the Island of Inversion: Unbound states in $^{29}$Ne

Holl,

Lindberg,

Heinz

et al. 2022

Preprint

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The nucleus 29 Ne is situated at the border of the island of inversion. Despite significant efforts, no bound low-lying intruder f 7/2 -state, which would place 29 Ne firmly inside the island of inversion, has yet been observed. Here, the first investigation of unbound states of 29 Ne is reported. The states were populated in 30 Ne(p, pn) and 30 Na(p, 2p) reactions at a beam energy of around 230 MeV/nucleon, and analyzed in terms of their resonance properties, partial cross sections and momentum distributions. The momentum distributions are compared to calculations using the eikonal, direct reaction model, allowing -assignments for the observed states. The lowest-lying resonance at an excitation energy of 1.48(4) MeV shows clear signs of a significant =3-component, giving first evidence for f 7/2 single particle strength in 29 Ne. The excitation energies and strengths of the observed states are compared to shell-model calculations using the sdpf-u-mix interaction.

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“…The original method for event-by-event multiplicity reconstruction is based on setting cuts in 2D-histograms where the number of clusters is plotted against the total deposited energy [6,7]. For each multiplicity, a designated zone in the histogram is created with cuts, see Fig.…”

Section: Calorimetric Methodsmentioning

confidence: 99%

“…, is a component of the reconstruction method originally proposed in the technical design report [6,7]. For the calculation of R, external knowledge of the beam energy E Beam is required.…”

Section: Modelmentioning

confidence: 99%

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Classical and machine learning methods for event reconstruction in NeuLAND

Mayer

Boretzky

Douma

et al. 2021

Nuclear Instruments and Methods in Physics Research Section A:

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NeuLAND, the New Large Area Neutron Detector, is a key component to investigate the origin of matter in the universe with experimental nuclear physics. It is a core component of the Reactions with Relativistic Radioactive Beams setup at the Facility for Antiproton and Ion Research, Germany. Neutrons emitted from these reactions create a wide range of patterns in NeuLAND. From these patterns, the number of neutrons (multiplicity) and their first interaction points must be reconstructed to determine the neutrons' four-momenta. In this paper, we detail the challenges involved in this reconstruction and present a range of possible solutions. Scikit-Learn classification models and simple Keras-based neural networks were trained on a wide range of input-scaler combinations and compared to classical models. While the improvement in multiplicity reconstruction is limited due to the overlap between features, the machine learning methods achieve a significantly better first interaction point selection, which directly improves the resolution of physical quantities.

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NeuLAND: The high-resolution neutron time-of-flight spectrometer for R3B at FAIR

Cited by 33 publications

References 57 publications

Hypernuclei formation in spallation reactions by coupling the Liège intranuclear cascade model to the deexcitation code ABLA

Hypernuclei formation in spallation reactions by coupling the Liège intranuclear cascade model to the deexcitation code ABLA

Border of the Island of Inversion: Unbound states in $^{29}$Ne

Classical and machine learning methods for event reconstruction in NeuLAND

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