Mon·Jun 17, 2024Monday·June 17, 2024

1. 01*

   Experimental studies of the three nucleon system dynamics in the proton induced deuteron breakup at 108 MeV

   A. Łobejko🇵🇱 · E. Stephan🇵🇱 · I. Ciepał🇵🇱 · J. Golak🇵🇱 · N. Kalantar--Nayestanaki🇳🇱 · S. Kistryn🇵🇱 · B. Kłos🇵🇱 · A. Kozela🇵🇱 · P. Kulessa🇵🇱 · W. Parol🇵🇱 · R. Skibiński🇵🇱 · I. Skwira-Chalot🇵🇱 and 5 other authors

   The differential cross sections for the ${}^2$H(p,pp)n reaction have been measured for 84 angular configurations of the outgoing protons in the range of polar angles from 13 to 33 degrees with a proton beam of 108 MeV. Data have been collected in the Cyclotron Center Bronowice (CCB) at the Institute of Nuclear Physics PAS in Cracow, using the BINA detector setup. Analysis leading to determination of the breakup cross section values is described. Absolute normalization is obtained by normalization to the simultaneously measured ${}^2$H(p,d)p scattering events.Experimental results are compared to the state-of-the-art theoretical calculations. Global analysis shows significant influence of the Coulomb interaction and small effects of three nucleon force in the studied phase space region.

   nucl-exPRC(2025)·2 citations
2. 02*

   Computational generation of tailored radionuclide libraries for alpha-particle and gamma-ray spectrometry

   Jaewoong Jang

   Radionuclide identification is a radioanalytical method employed in various scientific disciplines that utilize alpha-particle or gamma-ray spectrometric assays, ranging from astrophysics to nuclear medicine. Radionuclide libraries in conventional radionuclide identification systems are crafted in a manual fashion, accompanying labor-intensive and error-prone user tasks and hindering library customization. This research presents a computational algorithm and the architecture of its dedicated software that can automatically generate tailored radionuclide libraries. Progenitor-progeny recurrence relations were modeled to enable recursive computation of radionuclide subsets. This theoretical concept was incorporated into open-source software called RecurLib and validated against four actinide decay series and twelve radioactive substances, including a uranium-glazed legacy Fiestaware, natural uranium and thorium sources, a ${}^{226}$Ra sample, and the medical radionuclides ${}^{225}$Ac, ${}^{177}$Lu, and ${}^{99\text{m}}$Tc. The developed algorithm yielded radionuclide libraries for all the tested specimens within minutes, demonstrating its efficiency and applicability across diverse scenarios. The proposed approach introduces a framework for computerized radionuclide library generation, thereby trivializing library-driven radionuclide identification and facilitating the spectral recognition of unregistered radionuclides in radiation spectrometry.

   ↳ cs.CEastro-ph.IMnucl-exphysics.ins-detPRResearch(2024)·0 citations
3. 03*

   Steady state, displacement current and spin polarization for massless fermion in a shear flow

   Shu Lin🇨🇳 · Ziyue Wang🇨🇳

   We consider spin polarization of massless fermions in a shear flow, whose complete contributions contain magnetization current and side-jump current known from collisional chiral kinetic theory. We argue that the side-jump current adopts interpretation of displacement current. We explicitly determine the displacement current contribution in the steady state reached in shear flow for a QED plasma. We find the displacement contribution enhances the magnetization contribution at small and large momenta, but leads to a suppression effect at intermediate momenta. Major differences from previous studies on collisional effect are: (i) the fermions are in the same steady state as the medium rather than being probes; (ii) Compton scattering and pair annihilation are also included in addition to the Coulomb scattering considered before.

   ↳ hep-phnucl-exnucl-thPRD(2025)·18 citations
4. 04*

   Study of the Coulomb and nuclear breakup of ${}^{11}$Be using a Halo-EFT description at N${}^2$LO

   L.-P. Kubushishi🇩🇪 · P. Capel🇩🇪

   Background: The halo effective field theory (Halo-EFT) provides a very efficient description of loosely-bound nuclei in models of reaction. It offers a very systematical ranking of the significance of nuclear-structure observables in reaction calculations. This greatly helps to infer reliable structure information from reaction cross sections. However, for a meaningful analysis, the Halo-EFT scheme needs to have converged. Purpose: In a previous study [P. Capel, D. R. Phillips, and H.-W. Hammer, Phys. Rev. C 98, 034610 (2018)], NLO descriptions of 11Be have been developed and lead to excellent agreement with existing breakup data. However, the convergence of the scheme at NLO was not fully demonstrated. Moreover, a significant dependence on the regulator of the effective 10Be-n interaction has been observed. Method: We develop Halo-EFT descriptions of 11Be at N2LO and use them in an accurate breakup-reaction code. We compare our theoretical cross sections with experiment on Pb and C targets at about 70 MeV/nucleon. Results: On Pb, the N2LO descriptions of 11Be lead to little change to the NLO results of the previous study, confirming the convergence of that scheme. On C, the reaction is significantly affected by the presence of d resonances in the low-energy spectrum of 11Be. In the Halo-EFT power counting these resonances appear only at N2LO; our new descriptions include them naturally. Going to N2LO removes also the cutoff dependence observed in the previous study. Conclusions: We demonstrate the convergence of the Halo-EFT description of 11Be at NLO for Coulomb breakup and at N2LO for nuclear-dominated dissociation. The reliability of the nuclear-structure information inferred in the previous study is thus confirmed.

   ↳ nucl-thnucl-exPRC(2025)·1 citation
5. 05*

   Fudan Multi-purpose Active TArget Time Projection Chamber (fMeta-TPC) for Photonnuclear Reaction Experiments

   Huang-Kai Wu🇨🇳 · Xi-Yang Wang🇨🇳 · Yu-Miao Wang🇨🇳 · You-Jing Wang🇨🇳 · De-Qing Fang🇨🇳 · Wan-Bing He🇨🇳 · Wei-Hu Ma🇨🇳 · Xi-Guang Cao🇨🇳 · Chang-Bo Fu🇨🇳 · Xian-Gai Deng🇨🇳 · Yu-Gang Ma🇨🇳

   Active Target Time Projection Chambers (AT-TPCs) are state-of-the-art tools in the field of low-energy nuclear physics, particularly suitable for experiments using low-intensity radioactive ion beams or gamma rays. The Fudan Multi-purpose Active Target Time Projection Chamber (fMeta-TPC) with 2048 channels has been developed to study $\alpha$-clustering nuclei. {\fcb In this work, the focus is on the study of the photonuclear reaction with the Laser Compton Scattering (LCS) gamma source, especially for the decay of the highly excited $\alpha$-cluster state.} The design of fMeta-TPC is described and a comprehensive evaluation of its offline performance is performed by ultraviolet (UV) laser and ${}^{241}$Am $\alpha$ source. The result shows that the intrinsic angular resolution of the detector is within 0.30${}^{\circ }$ and has an energy resolution of 6.85\% for 3.0 MeV $\alpha$ particles. The gain uniformity of the detector is about 10\% (RMS/Mean), tested by the ${}^{55}$Fe X-ray source.

   ↳ physics.ins-detnucl-exnucl-thNucl.Sci.Tech.(2024)·7 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.