HUN-REN Institute for Nuclear Research

Low-energy electron collisions with BH+

BH+ ions are expected to play an important role in boron-containing plasmas relevant to fusion environments such as ITER, where low-energy electrons drive a variety of inelastic and reactive scattering processes. In particular, dissociative recombination, vibrational excitation,...

Can we define climate by means of an ensemble? A tale of time scales of convergence

Abstract. We study the suitability of an initial condition ensemble to form the conceptual basis of defining climate. We point out that the most important criterion for this is the uniqueness of the probability measure on which the definition relies. We first naively propose, in...

A random forest isoscape model of bioavailable Sr for South America: a focus on southern Brazil

In recent years, advances in machine learning have greatly improved the generation of maps showing the geographic distribution of isotope ratios (isoscapes), which have become essential tools for environmental, mobility and provenance studies in both modern and archaeological con...

Reassessment of a cosmic ray increase event in 1279/1280 CE using carbon-14 records of tree rings.

Extreme solar energetic particle events (ESPEs) rarely occur on the Sun, as known from cosmogenic isotope proxies, the primary being 14C measured in tree rings. Several such events have been identified in tree-ring 14C data as sharp spikes. The most recent spike, around 1279 CE,...

Data-Mining-Based Detector Calibrations for High-Energy Physics

The generation of Dead Hot Maps (DHMs) is an important part of PHENIX data analysis, as it helps reduce detector-related biases. During this step, detector units with abnormal behavior are identified, such as dead, hot, or extremely hot channels. Removing these channels from the...

Identification of a nanosecond isomer of $$^{164}$$Tb

Abstract This letter reports on the identification of a new isomeric state of $$^{164}$$ 164 Tb ( $$Z=65$$ Z = 65 , $$N=99$$ N = 99 ), which was measured with the DESPEC setup at the GSI Helmholtzzentrum für Schwerionenforschung GmbH following the first relativistic fragmentation...

Machine learning enhanced prediction of optical properties via reverse Monte Carlo method

We present a machine learning (ML) approach for the accelerated extraction of optical properties from the experimental reflection electron energy loss spectroscopy (REELS) spectra by the reverse Monte Carlo (RMC) method. Taking platinum (Pt) as an example, experimental REELS spec...

Pandemonium free data for the JEFF-project

Abstract Reactor decay heat is due to the decay of both fission products and neutron activated fuel and reactor materials. At relatively short cooling times it is dominated by the beta decay of fission products. The calculation of the decay heat contribution of a particular fissi...

Inscription of Quasi-Sinusoidal Surface Relief Optical Gratings in ZEONOR™ Cyclic Olefin Polymer by a 10.5 MeV N4+ Ion Microbeam at Low Implanted Fluences

Direct writing of microstructures in ZEONOR™ cyclic olefin polymer, using a high-energy medium-mass ion microbeam, was proposed and demonstrated. Microbeams of 10.5 MeV N4+ ions were used. The implanted fluences were between 2.5·1012 and 2.0·1013 ion/cm2. The microstructures were...