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Mapping neutron biological effectiveness for DNA damage induction as a function of incident energy and depth in a human sized phantom.
Sci Rep
January 2025
Radiation Biophysics and Radiobiology Laboratory, Physics Department, University of Pavia, Pavia, Italy.
We present new developments for an ab-initio model of the neutron relative biological effectiveness (RBE) in inducing specific classes of DNA damage. RBE is evaluated as a function of the incident neutron energy and of the depth inside a human-sized reference spherical phantom. The adopted mechanistic approach traces neutron RBE back to its origin, i.
View Article and Find Full Text PDFObservation of Strong Nuclear Suppression in Exclusive J/ψ Photoproduction in Au+Au Ultraperipheral Collisions at RHIC.
Phys Rev Lett
August 2024
Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany.
We report a measurement of exclusive J/ψ and ψ(2s) photoproduction in Au+Au ultraperipheral collisions at sqrt[s_{NN}]=200 GeV using the STAR detector. For the first time, (i) the ψ(2s) photoproduction in midrapidity at the Relativistic Heavy-Ion Collider has been experimentally measured; (ii) nuclear suppression factors are measured for both the coherent and incoherent J/ψ production. At average photon-nucleon center-of-mass energy of 25.
View Article and Find Full Text PDFPhotoproduction of K^{+}K^{-} Pairs in Ultraperipheral Collisions.
Phys Rev Lett
May 2024
INFN, Sezione di Pavia, Pavia, Italy.
K^{+}K^{-} pairs may be produced in photonuclear collisions, either from the decays of photoproduced ϕ(1020) mesons or directly as nonresonant K^{+}K^{-} pairs. Measurements of K^{+}K^{-} photoproduction probe the couplings between the ϕ(1020) and charged kaons with photons and nuclear targets. The kaon-proton scattering occurs at energies far above those available elsewhere.
View Article and Find Full Text PDFMechanical and Architectural Changes in Animal Bone Following Fast Neutron Irradiation.
Health Phys
August 2024
Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4L8, Canada.
Damage to healthy bone following exposure to ionizing radiation has been well documented for at least seven decades. Among the reported effects are a transient increase in stiffness and a reduction in breaking strength. These changes have been linked to a decrease in osteoblast proliferation and differentiation, inducing cell cycle arrest, reducing collagen production, and increasing sensitivity to apoptotic agents.
View Article and Find Full Text PDFX-rays, electrons, and neutrons as probes of atomic matter.
Structure
May 2024
IIMCB, Trojdena 4, 02-109 Warsaw, Poland; Polish Academy of Sciences, IBB, Pawinskiego 5a, 02-106 Warsaw, Poland. Electronic address:
X-rays, electrons, and neutrons probe different properties of matter. X-rays feel electron density (ED). Electrons sense the electrostatic potential (ESP) of electrons and nuclei.
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