Fri·Nov 17, 2023Friday·November 17, 2023

1. 01*

   Measurements of strange and multi-strange hadrons elliptic flow in isobar collisions at RHIC by STAR

   V. Bairathi (for the STAR Collaboration)🇨🇱

   We present measurements of elliptic flow ($v_2$) of $K_s^0$, $\Lambda$, $\bar{\Lambda }$, $\varphi$, ${\Xi }^{-}$, ${\overline{\Xi }}^{+}$, and ${\Omega }^{-}$+${\overline{\Omega }}^{+}$ at mid-rapidity ($|\eta |<$ 1.0) in isobar collisions (${}_{44}^{96}$Ru+${}_{44}^{96}$Ru and ${}_{40}^{96}$Zr+${}_{40}^{96}$Zr) at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV. The centrality and transverse momentum ($p_{\mathrm{T}}$) dependence of elliptic flow is presented. The number of constituent quark (NCQ) scaling of $v_2$ in isobar collisions is discussed. $p_T$-integrated elliptic flow ($⟨v_2⟩$) is observed to increase from central to peripheral collisions. The ratio of $⟨v_2⟩$ between the two isobars shows a deviation from unity for strange hadrons ($K_s^0$, $\Lambda$ and $\bar{\Lambda }$) indicating a difference in nuclear structure and deformation. A system size dependence of strange hadron $v_2$ at high $p_T$ is observed among Ru+Ru, Zr+Zr, Cu+Cu, Au+Au, and U+U systems. A multi-phase transport (AMPT) model with string melting (SM) describes the experimental data well in the measured $p_{\mathrm{T}}$ range for isobar collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV.

   nucl-exhep-ex1 citation
2. 02*

   Search for the origin of wobbling motion in the $A\approx 130$ region: The case of ${}^{131}$Xe

   S. Chakraborty🇮🇳 · S. Bhattacharyya🇮🇳 · R. Banik🇮🇳 · Soumik Bhattacharya🇮🇳 · G. Mukherjee🇮🇳 · C. Bhattacharya🇮🇳 · S. Biswas🇫🇷 · S. Rajbanshi🇮🇳 · Shabir Dar🇮🇳 · S. Nandi🇮🇳 · Sajad Ali🇮🇳 · S. Chatterjee🇮🇳 and 15 other authors

   In-beam $\gamma$-ray spectroscopy of ${}^{131}$Xe has been carried out to study the structure of the intruder $\nu h_{11/2}$ band. Excited states were populated via an $\alpha$-induced fusion-evaporation reaction at E${}_{\alpha }=38$ MeV. Inspection of $\gamma \gamma$-coincidence data resulted in the identification of a new rotational sequence. Based on the systematics of excitation energy, assigned spin-parity, decay pattern, and the electromagnetic character of the inter-band $\Delta I=1$ $\gamma$-transitions, this sequence is proposed as the unfavoured signature partner of the $\nu h_{11/2}$ band. The structure of this band is further illuminated in the light of the triaxial particle rotor model (TPRM). The possibility of wobbling excitation in $N=77$ Xe-Ba-Ce isotones has been explored in a systematic manner.

   nucl-exPRC(2023)·7 citations
3. 03*

   Two-particle angular correlations of identified particles in pp collisions at $\sqrt{s}$ = 13 TeV with ALICE

   Daniela Ruggiano🇵🇱

   Two-particle angular correlation is one of the most powerful tools to study the mechanism of particle production in proton--proton (pp) collision systems by relating the difference between the azimuthal angle ($\Delta \phi$) and the rapidity ($\Delta y$) of the particles from a pair. Hadronization processes are influenced by various physical phenomena, such as resonance decay, Coulomb interactions, laws of conservation of energy and momentum, and others, because of the quark content of the particles involved. Therefore, each correlation function is unique and shows a different dependence on transverse momentum $p_{\mathrm{T}}$ and/or multiplicity. The angular correlation functions reported by the ALICE Collaboration in pp collisions showed an anticorrelation in short range of ($\Delta y,\Delta \phi$) for baryon pairs which is not predicted by any theoretical model.\\ \indent In this contribution, this behavior will be investigated by studying identified charged hadrons (i.e., ${\pi }^{\pm }$, ${\mathrm{K}}^{\pm }$, and p($\bar{\mathrm{p}}$)) in the $\Delta y,\Delta \phi$ space in pp collisions at $\sqrt{s}=13$ TeV recorded by ALICE. In addition, to distinguish the various physical contributions, collisions with different multiplicities are analyzed separately and diverse normalization methods are applied.

   nucl-exhep-exNuovo Cim.C(2024)·5 citations
4. 04*

   Measurements of the lightest hypernucleus (${}_{\mathrm{\Lambda }}^3\mathrm{H}$): progress and perspective

   Jinhui Chen🇨🇳 · Xin Dong🇺🇸 · Yu-Gang Ma🇨🇳 · Zhangbu Xu🇺🇸

   The hyperon-nucleon ($Y$-$N$) interaction is important for the description of the equation-of-state of high baryon density matter. Hypernuclei, the cluster object of nucleons and hyperons, serve as cornerstones of a full understanding of the $Y$-$N$ interaction. Recent measurements of the lightest known hypernucleus, the hypertriton's (${}_{\mathrm{\Lambda }}^3\mathrm{H}$) and anti-hypertriton's (${}_{\bar{\mathrm{\Lambda }}}^3\bar{\mathrm{H}}$) lifetime, mass and $\Lambda$ separation energy have attracted interests on the subject. Its cross section and collective flow parameters have also been measured in heavy-ion collisions, which have revealed new features on its production mechanism. In this article we summarise recent measurements of ${}_{\mathrm{\Lambda }}^3\mathrm{H}$, focusing on the heavy-ion collisions. We will discuss their implications for the ${}_{\mathrm{\Lambda }}^3\mathrm{H}$ properties and the constrains on the $Y$-$N$ interaction models.

   nucl-exnucl-thSci.Bull.(2023)·39 citations
5. 05*

   Measurement of forward charged hadron flow harmonics in peripheral PbPb collisions at $\sqrt{s_{NN}}=5.02$ TeV with the LHCb detector

   LHCb collaboration: R. Aaij · A.S.W. Abdelmotteleb · C. Abellan Beteta · F. Abudinén · T. Ackernley · B. Adeva · M. Adinolfi · P. Adlarson · C. Agapopoulou · C.A. Aidala · Z. Ajaltouni · S. Akar and 1091 other authors

   Flow harmonic coefficients, $v_n$, which are the key to studying the hydrodynamics of the quark-gluon plasma (QGP) created in heavy-ion collisions, have been measured in various collision systems and kinematic regions and using various particle species. The study of flow harmonics in a wide pseudorapidity range is particularly valuable to understand the temperature dependence of the shear viscosity to entropy density ratio of the QGP. This paper presents the first LHCb results of the second- and the third-order flow harmonic coefficients of charged hadrons as a function of transverse momentum in the forward region, corresponding to pseudorapidities between 2.0 and 4.9, using the data collected from PbPb collisions in 2018 at a center-of-mass energy of $5.02$ TeV. The coefficients measured using the two-particle angular correlation analysis method are smaller than the central-pseudorapidity measurements at ALICE and ATLAS from the same collision system but share similar features.

   nucl-exhep-exPRC(2024)·9 citations
6. 06*

   FENDL: A library for fusion research and applications

   G. Schnabel🇦🇹 · D.L. Aldama🇨🇺 · T. Bohm🇺🇸 · U. Fischer🇩🇪 · S. Kunieda🇯🇵 · A. Trkov🇬🇧 · C. Konno🇯🇵 · R. Capote🇦🇹 · A.J. Koning🇦🇹 · S. Breidokaite🇷🇺 · T. Eade🇬🇧 · M. Fabbri🇪🇸 and 19 other authors

   The Fusion Evaluated Nuclear Data Library (FENDL) is a comprehensive and validated collection of nuclear cross section data coordinated by the International Atomic Energy Agency (IAEA) Nuclear Data Section (NDS). FENDL assembles the best nuclear data for fusion applications selected from available nuclear data libraries and has been under development for decades. FENDL contains sub-libraries for incident neutron, proton, and deuteron cross sections including general purpose and activation files used for particle transport and nuclide inventory calculations. We describe the history, selection of evaluations for the various sub-libraries (neutron, proton, deuteron) with the focus on transport and reactor dosimetry applications, the processing of the nuclear data for application codes, and the development of the TENDL-2017 library which is the currently recommended activation library for FENDL. We briefly describe the IAEA IRDFF library as the recommended library for dosimetry fusion applications. We also present work on validation of the neutron sub-library using a variety of fusion relevant computational and experimental benchmarks. A variety of cross section libraries are used for the validation work including FENDL-2.1, FENDL-3.1d, FENDL-3.2, ENDF/B-VIII.0, and JEFF-3.2 with the emphasis on the FENDL libraries. The results of the experimental validation showed that the performance of FENDL-3.2b is at least as good and in most cases better than FENDL-2.1. Future work will consider improved evaluations developed by the International Nuclear Data Evaluation Network (INDEN). Additional work will be needed to investigate differences in gas production in structural materials. Covariance matrices need to be updated to support the development of fusion technology. Additional validation work for high-energy neutrons, protons and deuterons, and the activation library will be needed.

   ↳ nucl-thcs.DLnucl-exNucl.Data Sheets(2024)·5 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.