Fri·Mar 8, 2024Friday·March 8, 2024

1. 01*

   Isomeric states of fission fragments explored via Penning trap mass spectrometry at IGISOL

   A. Jaries🇫🇮 · M. Stryjczyk🇫🇮 · A. Kankainen🇫🇮 · L. Al Ayoubi🇫🇮 · O. Beliuskina🇫🇮 · L. Canete🇫🇮 · R.P. de Groote🇫🇮 · C. Delafosse🇫🇮 · P. Delahaye🇫🇷 · T. Eronen🇫🇮 · M. Flayol🇫🇷 · Z. Ge🇫🇮 and 27 other authors

   The masses of ${}^{84}$Br, ${}^{105}$Mo, ${}^{115,119,121}$Pd, ${}^{122}$Ag, ${}^{127,129}$In, ${}^{132}$Sb and their respective isomeric states have been measured with the JYFLTRAP Penning trap mass spectrometer using the phase-imaging ion-cyclotron-resonance technique. The excitation energies of the isomeric states in ${}^{132}$Sb and ${}^{119}$Pd were experimentally determined for the first time, while for ${}^{84}$Br, ${}^{115}$Pd and ${}^{127,129}$In, the precision of the mass values was substantially improved. In ${}^{105}$Mo and ${}^{121}$Pd there were no signs of a long-lived isomeric state. The ground-state measurements of ${}^{119}$Pd and ${}^{122}$Ag indicated that both are significantly more bound than the literature values. For ${}^{122}$Ag, there was no indication of a proposed third long-lived state. The results for the $N=49$ nucleus ${}^{84}$Br and isomers close to doubly magic ${}^{132}$Sn have been compared to the shell-model and the microscopic quasiparticle-phonon model calculations.

   nucl-exnucl-thPRC(2024)·5 citations
2. 02*

   Real-Time Charged Track Reconstruction for CLAS12

   Gagik Gavalian🇺🇸

   This paper presents the results of charged particle track reconstruction in CLAS12 using artificial intelligence. In our approach, we use machine learning algorithms to reconstruct tracks, including their momentum and direction, with high accuracy from raw hits of the CLAS12 drift chambers. The reconstruction is performed in real-time, with the rate of data acquisition, and allows for the identification of event topologies in real-time. This approach revolutionizes the Nuclear Physics experiments' data processing, allowing us to identify and categorize the experimental data on the fly, and will lead to a significant reduction in experiment data processing. It can also be used in streaming readout applications leading to more efficient data acquisition and post-processing.

   ↳ physics.ins-detnucl-exphysics.data-anJINST(2024)·4 citations
3. 03*

   Non-equilibrium Green's function approach to low-energy fission dynamics: fluctuations in fission reactions

   K. Uzawa🇯🇵 · K. Hagino🇯🇵

   We present a microscopic modeling for a decay of a heavy compound nucleus, starting from a nucleonic degree of freedom. To this end, we develop an approach based on a non-equilibrium Green's function, which is combined with a configuration interaction (CI) approach based on a constrained density-functional theory (DFT). We apply this approach to a barrier-top fission of ${}^{236}$U, restricting the model space to seniority zero configurations of neutrons and protons. We particularly focus on the distribution of the fission probability. We find that it approximately follows the chi-squared distribution with the number of degrees of freedom $\nu$ of the order of 1, which is consistent with the experimental finding. We also show that $\nu$ corresponds to the number of eigenstates of the many-body Hamiltonian whose energy is close to the excitation energy of the system and at the same time which have significant components on both sides of a fission barrier.

   ↳ nucl-thcond-mat.mes-hallcond-mat.stat-mechnucl-ex+1PRC(2024)·4 citations
4. 04*

   Detection of proton tracks with LiF Fluorescent Nuclear Track Detectors

   P.Bilski · B.Marczewska · M.Sankowska · A.Kilian · J.Swakoń · Z.Siketić · P.Olko

   Fluorescent nuclear track detectors based on LiF crystals were successfully applied for detection of proton induced tracks. Irradiations were performed with protons with energy ranging from 1 MeV up to about 56 MeV and for all proton energies the fluorescent tracks were observed. The tracks are not continuous, but consist of a series of bright spots. The gaps between spots tend to narrow with decreasing proton energy (increasing ionization density). For the highest of the studied energies, the spots are scattered so sparsely, that it is not possible to link spots belonging to one track. The intensity (brightness) of the fluorescent tracks increases with the increasing LET and agrees well with the trend established earlier for various heavier ions.

   ↳ physics.ins-detnucl-exRadiat.Meas.(2024)·3 citations
5. 05*

   Momentum correlation of light nuclei in Au + Au collisions at $\sqrt{s_{NN}}$ = 2.0 $\sim$ 7.7 GeV

   Feng-Hua Qiao🇨🇳 · Xian-Gai Deng🇨🇳 · Yu-Gang Ma🇨🇳

   Within the Ultra-relativistic Quantum Molecular Dynamics model (UrQMD) coupled with nucleon coalescence model and Mini-Spanning-Tree model, the yields of light nuclei have been stimulated in Au + Au collisions over an energy range of \(\sqrt{s_{NN}}=2.0\sim7.7\ \rm{GeV}\) and the momentum correlation functions of light nuclei pairs have been calculated by both the Lednický-Lyuboshitz and the Correlation After Burner methods. We compare the yields of light nuclei and their momentum correlation functions at midrapidity in this energy region with experimental data. It is found that there are differences between the results of the two models, and the coalescence method seems less valid at low collision energy. Furthermore, both the peak values of proton-proton correlation functions and the transition point of elliptic flows from out-of-plane to in-plane emission show a turning point around 3-4 GeV, which suggests that there is a relation between momentum correlation function and collective flow of particles.

   ↳ nucl-thnucl-exPLB(2024)·7 citations
6. 06*

   Signatures of an $\alpha$ + core structure in ${}^{44}$Ti + ${}^{44}$Ti collisions at $\sqrt{s_{NN}}=5.02$ TeV by a multiphase transport model

   Yu-Xuan Zhang🇨🇳 · Song Zhang🇨🇳 · Yu-Gang Ma🇨🇳

   It is important to understand whether $\alpha$-clustering structures can leave traces in ultra-relativistic heavy ion collisions. Using the modified AMPT model, we simulate three $\alpha$ + core configurations of ${}^{44}$Ti in ${}^{44}$Ti+${}^{44}$Ti collisions at $\sqrt{s_{NN}}=5.02$ TeV as well as other systems with Woods-Saxon structures. One of these configurations has no additional constraint, but the other two have the Mott density edge $r_{\mathrm{Mott}}$ set as either a lower or upper bound on the cluster position $r_{\alpha }$ to check the influence of $\alpha$ dissolution. This is the first time that the initial stage of the geometric properties in heavy-ion collisions has been configured using the traditional treatment of the nuclear structure. We compare the radial nucleon density, multiplicity distribution, transverse momentum spectra, eccentricity, triangularity, elliptic flow and triangular flow of these six systems. $\alpha$ + core structures can alter all these observations especially in the most-central collisions, among which elliptic flow is the most hopeful as a probe of such structures.

   ↳ nucl-thnucl-exEPJA(2024)·5 citations
7. 07*

   Activation measurements of an iodinated contrast media for online range verification in proton therapy

   A. Espinosa-Rodriguez · V.V. Onecha🇪🇸 · V.M. Nouvilas · S. Viñals i Onsès · P. Ibañez🇪🇸 · S.España🇪🇸 · D. Sánchez-Parcerisa🇪🇸 · J.M. Udías🇪🇸 · L.M. Fraile🇪🇸

   The use of contrast agents has previously been proposed as a novel method to increase the activation close to the Bragg peak, aiming to improve the quality of proton range monitoring in vivo. In a recent work, we demonstrated the feasibility of ${}^{127}$I for online verification, thanks to its high cross-section (200 mbarn at 10 MeV) and low energy production threshold for ${}^{127m}$Xe. The spectroscopy-based method relies on identifying two specific delayed $\gamma$ lines (at 124.6 and 172.5 keV), which can be analyzed via single-photon emission computed tomography (SPECT). In this work, we present a proof-of-principle study to investigate proton activation in a commercial iodinated contrast media (ICM) for radiology. Five measurements were conducted at different proton energies (6-10 MeV), equivalent to the last millimeters of clinical proton range. Activation in the ICM was measured with four LaBr${}_3$(Ce) scintillators. The contribution from iodine was separated from the activation of the solvent, yielding excellent agreement with previously reported data. These results demonstrate the potential of this technique and pave the way for further testing in clinically relevant scenarios.

   ↳ physics.med-phnucl-ex0 citations
8. 08*

   Invariant amplitudes, unpolarized cross sections, and polarization asymmetries in (anti)neutrino-nucleon elastic scattering

   Kaushik Borah🇺🇸 · Minerba Betancourt🇺🇸 · Richard J. Hill🇺🇸 · Thomas Junk🇺🇸 · Oleksandr Tomalak🇺🇸

   At leading order in weak and electromagnetic couplings, cross sections for (anti)neutrino-nucleon elastic scattering are determined by four nucleon form factors that depend on the momentum transfer $Q^2$. Including radiative corrections in the Standard Model and potential new physics contributions beyond the Standard Model, eight invariant amplitudes are possible, depending on both $Q^2$ and the (anti)neutrino energy $E_{\nu }$. We review the definition of these amplitudes and use them to compute both unpolarized and polarized observables including radiative corrections. We show that unpolarized accelerator neutrino cross-section measurements can probe new physics parameter space within the constraints inferred from precision beta decay measurements.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2024)·9 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.