Fri·Nov 5, 2021Friday·November 5, 2021

1. 01*

   Production of 177Lu with deuterons at IFMIF-DONES facility

   E. López-Melero (1)🇪🇸 · F. García-Infantes (1 y 2)🇪🇸 · I. López-Casas (1)🇪🇸 · F. Arias de Saavedra (1)🇪🇸 · I. Porras (1)🇪🇸 · A. Roldán (3)🇪🇸 · L. Fernández-Maza (4)🇪🇸 · J. Praena (1 and 2) ((1) Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, Spain. (2) European Organization for Nuclear Research (CERN), Geneva, Switzerland (3) Departamento de Electrónica y Tecnología de Computadoras, Universidad de Granada, Spain (4) Hospital virgen de la Arrixaca, Murcia, Spain)🇪🇸

   The International Fusion Materials Irradiation Facility - Demo Oriented NEutron Source (IFMIF-DONES) is a single-sited novel Research Infrastructure for testing, validation and qualification of the materials to be used in a fusion reactor. The main purpose of IFMIF-DONES is related to fusion technology and neutron irradiation of the materials to be used in the future fusion power plants. However, there is an important effort to take advantage of the outstanding characteristics of the facility in terms of neutrons and deuterons. One of the applications could be radioisotopes production with deuterons and neutrons. We discuss here the possible production of radioisotopes with deuterons at DONES. In this work, we have focused on the production of 177Lu with deuterons. The study has been carried out through the design and simulation of a device as cooling system for the sample producing the radioisotope. The results show the viability of using DONES for such production. In addition, the study suggests that new nuclear energy data above 20 MeV for deuterons is mandatory for an accurate study in this field.

   ↳ physics.ins-detnucl-ex0 citations
2. 02*

   Testing for the Continuous Spectrum of X-Rays Predicted to Accompany the Photoejection of an Atomic Inner Shell Electron

   Philip Jacobson🇺🇸 · Andrija Rasovic🇺🇸 · Arthur Campello🇺🇸 · Chase Goddard🇺🇸 · Matthew Dykes🇺🇸 · Yuchao Chen🇺🇸 · J.Y. Peter Ko🇰🇷 · Stanislav Stoupin🇺🇸 · Gwen Gardner🇺🇸 · Justin Oh🇺🇸 · Carl Franck🇺🇸

   Echoing classical physics, quantum electrodynamics predicts the release of a spectral continuum of electromagnetic radiation upon the sudden acceleration of charged particles in quantum matter. Despite apparent theoretical success in describing sister nuclear processes, known as internal bremsstrahlung, following nuclear beta decay and K capture, the situation of the photoejection of an electron from an inner shell of an atom, intraatomic bremsstrahlung (IAB), is far from settled. In this paper we present fresh measurements which rely on contemporary signal processing as well as the high flux available from a synchrotron radiation source to revisit the problem by photoejecting electrons from the innermost shell of copper. For the first time we have sufficient sample statistics to measure the expected spectra at the level expected by contemporary theory. Furthermore, we employ sufficiently thin targets to overcome secondary scattering artifacts. Our approach applies the fluorescence coincidence method to guard against extraneous scattering and multiple incident photon processes. Our observations set a severe upper limit on the rate for IAB: We conclude that current theory overpredicts, by at least 5 sigma, the measured rate for K shell IAB in copper in the range of detected energies below the K fluorescence energy.

   ↳ physics.atom-phhep-exnucl-exPRA(2021)·0 citations
3. 03*

   Pulse shape discrimination for GRIT: beam test of a new integrated charge and current preamplifier coupled with high granularity Silicon detectors

   J.-J. Dormard🇫🇷 · M. Assié🇫🇷 · L. Grassi🇫🇷 · E. Rauly🇫🇷 · D. Beaumel🇫🇷 · G. Brulin🇫🇷 · M. Chabot🇫🇷 · J.-L. Coacolo🇫🇷 · F. Flavigny🇫🇷 · B. Genolini🇫🇷 · F. Hammache🇫🇷 · T. Id Barkach🇫🇷 and 4 other authors

   The GRIT (Granularity, Resolution, Identification, Transparency) Silicon array is intended to measure direct reactions. Its design is based on several layers (three layers in the forward direction, two backward) of custom-made trapezoidal and square detectors. The first stage is 500 {\mu}m thick and features 128x128 orthogonal strips. Pulse shape analysis for particle identification is implemented for this first layer. Given the compacity of this array and the large number of channels involved (>7,500), an integrated preamplifier, iPACI, that gives charge and current information has been developed in the AMS 0.35 {\mu}m BiCMOS technology. The design specifications and results of the test bench are presented. Considering an energy range of 50 MeV and an energy resolution (FWHM) of 12 keV (FWHM) for the preamplifier, the energy resolution for one strip obtained from alpha source measurement in real conditions is 35 keV. The current output bandwidth is measured at 130 MHz for small signals and the power consumption reaches 40 mW per detector channel. A first beam test was performed coupling a nTD trapezoidal double-sided stripped Silicon detector of GRIT with the iPACI preamplifier and a 64-channel digitizer. Z=1 particles are discriminated with pulse shape analysis technique down to 2 MeV for protons, 2.5 MeV for deuterons and 3 MeV for tritons. The effect of the strip length due to the trapezoidal shape of the detector is investigated on both the N- and the P-side, showing no significant impact.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2021)·5 citations
4. 04*

   Constraining the nucleon size with relativistic nuclear collisions

   Giuliano Giacalone🇩🇪 · Björn Schenke🇺🇸 · Chun Shen🇺🇸

   The notion of the "size" of nucleons and their constituents plays a pivotal role in the current paradigm of the formation and the fluctuations of the quark-gluon plasma produced in high-energy nuclear collision experiments. We report on state-of-the-art hydrodynamic results showing that the correlation between anisotropic flow, $v_n^2$, and the mean transverse momentum of hadrons, $[p_t]$, possesses a unique sensitivity to the nucleon size in off-central heavy-ion collisions. We argue that existing experimental measurements of this observable support a picture where the relevant length scale characterizing the colliding nucleons is of order 0.5 fm or smaller, and we discuss the broad implications of this finding for future global Bayesian analyses aimed at extracting initial-state and medium properties from nucleus-nucleus collision data, including $v_n^2$-$[p_t]$ correlations. Determinations of the nucleon size in heavy-ion collisions will provide a solid independent constraint on the initial state of small system collisions, and will establish a deep connection between collective flow data in nucleus-nucleus experiments and data on deep inelastic scattering on protons and nuclei.

   ↳ nucl-thhep-exhep-phnucl-exPRL(2022)·43 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.