Tue·Apr 12, 2022Tuesday·April 12, 2022

1. 01*

   Neutron capture measurement and resonance parameter analysis of natSm

   X.X. Li🇨🇳 · L.X. Liu · W. Jiang🇨🇳 · J. Ren🇨🇳 · H.W. Wang · G.T. Fan🇨🇳 · J.J. He🇨🇳 · D.X. Wang · S.Y Zhang · Z.D. An · X.G. Cao🇨🇳 · L.L. Song🇨🇳 and 18 other authors

   Multiple isotopes of samarium element are the isotopes produced by the s process, and 154Sm is produced by the r process. In addition, 144Sm is p nuclei in nuclear astrophysics. The measurement of these can help us to better understand the results of relevant photonuclear reaction experiments. On the other hand, 149Sm is a 235U fission product with a 1% yield, its cross sections are important to reactor neutronics. In this work, the neutron capture yield of the natural samarium target was measured at the back-streaming white neutron beamline (Back-n) of the China Spallation Neutron Source (CSNS), and the resonance parameters were analyzed by SAMMY code. The resonance peaks and the neutron separation energies contributed by the different isotopes are considered individually. The results of the capture yield found signs of the possibility of two resonance peaks at 8 eV, which awaits further experimental examination. Cross-section was calculated according to resonance parameters and was compared with other experimental results and evaluation databases of ENDF/B-VIII.0 and CENDL-3.2. A clear difference between ENDF/B VIII.0 and CENDL-3.2 database appears at 23.2 eV, the experimental result at this energy is smaller than data of ENDF/B VIII.0 database but CENDL-3.2 database. Most of the controversial experimental results invariably come from the samarium 149 isotope.

   nucl-ex0 citations
2. 02*

   The COHERENT Experimental Program

   D. Akimov · S. Alawabdeh · P. An · A. Arteaga · C. Awe · P.S. Barbeau · C. Barry · B. Becker · V. Belov · I. Bernardi · M.A. Blackston · L. Blokland and 119 other authors

   The COHERENT experiment located in Neutrino Alley at the Spallation Neutron Source (SNS), Oak Ridge National Laboratory (ORNL), has made the world's first two measurements of coherent elastic neutrino-nucleus scattering (CEvNS), on CsI and argon, using neutrinos produced at the SNS. The COHERENT collaboration continues to pursue CEvNS measurements on various targets as well as additional studies of inelastic neutrino-nucleus interactions, searches for accelerator-produced dark matter (DM) and physics beyond the Standard Model, using the uniquely high-quality and high-intensity neutrino source available at the SNS. This white paper describes primarily COHERENT's ongoing and near-future program at the SNS First Target Station (FTS). Opportunities enabled by the SNS Second Target Station (STS) for the study of neutrino physics and development of novel detector technologies are elaborated in a separate white paper.

   ↳ hep-exnucl-exphysics.ins-det61 citations
3. 03*

   Machine learning based event classification for the energy-differential measurement of the ${}^{\text{nat}}$C(n,p) and ${}^{\text{nat}}$C(n,d) reactions

   P. Žugec🇭🇷 · M. Barbagallo🇮🇹 · J. Andrzejewski🇵🇱 · J. Perkowski🇵🇱 · N. Colonna🇮🇹 · D. Bosnar🇭🇷 · A. Gawlik🇵🇱 · M. Sabate-Gilarte🇨🇭 · M. Bacak🇨🇭 · F. Mingrone🇨🇭 · E. Chiaveri🇨🇭

   The paper explores the feasibility of using machine learning techniques, in particular neural networks, for classification of the experimental data from the joint ${}^{\text{nat}}$C(n,p) and ${}^{\text{nat}}$C(n,d) reaction cross section measurement from the neutron time of flight facility n_TOF at CERN. Each relevant $\Delta E$-$E$ pair of strips from two segmented silicon telescopes is treated separately and afforded its own dedicated neural network. An important part of the procedure is a careful preparation of training datasets, based on the raw data from Geant4 simulations. Instead of using these raw data for the training of neural networks, we divide a relevant 3-parameter space into discrete voxels, classify each voxel according to a particle/reaction type and submit these voxels to a training procedure. The classification capabilities of the structurally optimized and trained neural networks are found to be superior to those of the manually selected cuts.

   ↳ physics.data-ancs.CVnucl-exNucl.Instrum.Meth.A(2022)·5 citations
4. 04*

   The optimized point-coupling interaction for the relativistic energy density functional of Hartree-Bogoliubov approach quantifying the nuclear bulk properties

   Zi Xin Liu · Yi Hua Lam🇫🇷 · Ning Lu · Peter Ring🇩🇪

   We propose a newly optimized nonlinear point-coupling parameterized interaction, PC-L3R, for the relativistic Hartree-Bogoliubov framework with a further optimized separable pairing force by fitting to observables, i.e., the binding energies of 91 spherical nuclei, charge radii of 63 nuclei, and 12 sets of mean pairing gaps consisting of 54 nuclei in total. The separable pairing force strengths of proton and neutron are optimized together with the point-coupling constants, and are justified in satisfactory reproducing the empirical pairing gaps. The comparison of experimental binding energies compiled in AME2020 for 91 nuclei with the ones generated from the present and other commonly used point-coupling interactions indicates that the implementation of PC-L3R in relativistic Hartree-Bogoliubov yields the lowest root-mean-square deviation. The charge radii satisfactory agree with experiment. Meanwhile, PC-L3R is capable of estimating the saturation properties of the symmetric nuclear matter and of appropriately predicting the isospin and mass dependence of binding energy. The experimental odd-even staggering of single nucleon separation energies is well reproduced. The comparison of the estimated binding energies for 7,373 nuclei based on the PC-L3R and other point-coupling interactions is also presented.

   ↳ nucl-thnucl-exPLB(2023)·15 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.