Wed·Jan 11, 2023Wednesday·January 11, 2023

1. 01*

   Multiple Mechanisms in Proton-Induced Nucleon Removal at $\sim$100 MeV/Nucleon

   T. Pohl🇩🇪 · Y. L. Sun🇫🇷 · A. Obertelli🇩🇪 · J. Lee🇨🇳 · M. Gomez-Ramos🇪🇸 · K. Ogata🇯🇵 · K. Yoshida🇯🇵 · B.S. Cai🇨🇳 · C.X. Yuan🇨🇳 · B. A. Brown🇺🇸 · H. Baba🇯🇵 · D. Beaumel🇫🇷 and 39 other authors

   We report on the first proton-induced single proton- and neutron-removal reactions from the neutron-deficient ${}^{14}$O nucleus with large Fermi-surface asymmetry $S_n-S_p$ = 18.6 MeV at $\sim$100 MeV/nucleon, a widely used energy regime for rare-isotope studies. The measured inclusive cross sections and parallel momentum distributions of the ${}^{13}$N and ${}^{13}$O residues are compared to the state-of-the-art reaction models, with nuclear structure inputs from many-body shell-model calculations. Our results provide the first quantitative contributions of multiple reaction mechanisms including the quasifree knockout, inelastic scattering and nucleon transfer processes. It is shown that the inelastic scattering and nucleon transfer, usually neglected at such energy regime, contribute about 50% and 30% to the loosely bound proton and deeply bound neutron removal, respectively. These multiple reaction mechanisms should be considered in analyses of inclusive one-nucleon removal cross sections measured at intermediate energies for quantitative investigation of single-particle strengths and correlations in atomic nuclei.

   nucl-exnucl-thPRL(2023)·17 citations
2. 02*

   Hadron Production and Propagation in Pion-Induced Reactions on Nuclei

   R. Abou Yassine · J. Adamczewski-Musch · O. Arnold · E.T. Atomssa · M. Becker · C. Behnke · J.C. Berger-Chen · A. Blanco · C. Blume · M. Böhmer · L. Chlad · P. Chudoba and 116 other authors

   Hadron production (${\pi }^{\pm }$, proton, $\Lambda$, $K_S^0$, $K^{\pm }$) in ${\pi }^{-}+\mathrm{C}$ and ${\pi }^{-}+\mathrm{W}$ collisions is investigated at an incident pion beam momentum of $1.7\mathrm{GeV}/c$. This comprehensive set of data measured with HADES at SIS18/GSI significantly extends the existing world data on hadron production in pion induced reactions and provides a new reference for models that are commonly used for the interpretation of heavy-ion collisions. The measured inclusive differential production cross-sections are compared with state-of-the-art transport model (GiBUU, SMASH) calculations. The (semi-) exclusive channel ${\pi }^{-}+A\to \Lambda +K_S^0+X$, in which the kinematics of the strange hadrons are correlated, is also investigated and compared to a model calculation. Agreement and remaining tensions between data and the current version of the considered transport models are discussed.

   nucl-exEPJA(2024)·5 citations
3. 03*

   Nuclear $\beta$ decay as a probe for physics beyond the Standard Model

   M. Brodeur🇺🇸 · N. Buzinsky🇺🇸 · M. A. Caprio🇺🇸 · V. Cirigliano🇺🇸 · J. A. Clark🇺🇸 · P. J. Fasano🇺🇸 · J. A. Formaggio🇺🇸 · A. T. Gallant🇺🇸 · A. Garcia🇺🇸 · S. Gandolfi🇺🇸 · S. Gardner🇺🇸 · A. Glick-Magid🇺🇸 and 34 other authors

   This white paper was submitted to the 2022 Fundamental Symmetries, Neutrons, and Neutrinos (FSNN) Town Hall Meeting in preparation for the next NSAC Long Range Plan. We advocate to support current and future theoretical and experimental searches for physics beyond the Standard Model using nuclear $\beta$ decay.

   nucl-exnucl-th26 citations
4. 04*

   Fourier coefficients of noninterdependent collective motions in heavy-ion collisions

   Zhiwan Xu🇺🇸 · Gang Wang🇺🇸 · Aihong Tang🇺🇸 · Huan Zhong Huang🇺🇸

   We present a scenario in heavy-ion collisions where different modes of collective motions are noninterdependent, driven by factorized actions in the created nuclear medium. Such physics mechanisms could each dominate at a distinct evolution stage, or coexist simultaneously. If the probability of particle emission is modulated by each nondependent collective motion with a single-harmonic Fourier expansion, the particle azimuthal distribution should be the product of all these expansions. Consequently, nonleading cross terms between collectivity modes appear, and their contributions to experimental observables could be significant. In particular, we argue that the chiral magnetic effect (CME) and elliptic flow can develop separately, with their convolution affecting the observable that is sensitive to the shear-induced CME. We will use the event-by-event anomalous-viscous fluid dynamics model to illustrate the effects of this scenario. Besides giving insights into searches for the CME, we also propose feasible experimental tests based on conventional flow harmonics, and demonstrate the emergence of nonleading cross terms with a multiphase transport model.

   ↳ nucl-thnucl-exPRC(2023)·5 citations
5. 05*

   Examination of nucleon distribution with Bayesian imaging for isobar collisions

   Yi-Lin Cheng🇩🇪 · Shuzhe Shi🇺🇸 · Yu-Gang Ma🇨🇳 · Horst Stöcker🇩🇪 · Kai Zhou🇩🇪

   Relativistic collision of isobaric systems is found to be valuable in differentiating the nucleon distributions for nuclei with the same mass number. In recent contrast experiment of ${}_{44}^{96}\text{Ru}{+}_{44}^{96}\text{Ru}$ versus ${}_{40}^{96}\text{Zr}{+}_{40}^{96}\text{Zr}$ collisions at $\sqrt{s_{\text{NN}}}=200\text{GeV}$, the ratios of multiplicity distribution, elliptic flow, triangular flow, and radial flow are precisely measured and found to be significantly different from unity, indicating the difference in the shapes of the isobar pair. In this work, we investigate the feasibility of nuclear structure reconstruction from heavy-ion collision observables. We perform Bayesian Inference with employing the Monte-Carlo Glauber model as an estimator of the mapping from nuclear structure to the final state observables and to provide the mock data for reconstruction. By varying combination of observables included in the mock data, we find it plausible to infer Woods--Saxon parameters from the observables. We also observe that single-system multiplicity distribution for the isobar system, rather than their ratio, is crucial to simultaneously determine the nuclear structure for the isobar system.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2023)·20 citations
6. 06*

   $\Lambda NN$ content of $\Lambda$-nucleus potential

   Eliahu Friedman🇮🇱 · Avraham Gal🇮🇱

   A minimally constructed $\Lambda$-nucleus density-dependent optical potential is used to calculate binding energies of observed $1s_{\Lambda }$, $1p_{\Lambda }$ states across the periodic table, leading to a repulsive $\Lambda NN$ contribution $D_{\Lambda }^{(3)}\approx 14$ MeV to the phenomenological $\Lambda$-nucleus potential depth $D_{\Lambda }\approx -30$ MeV. This value is significant in connection with the so-called 'hyperon puzzle'.

   ↳ nucl-thhep-phnucl-exEPJ Web Conf.(2022)·5 citations
7. 07*

   Role of chemical potential at kinetic freeze-out using Tsallis non-extensive statistics in proton-proton collisions at the Large Hadron Collider

   Girija Sankar Pradhan🇮🇳 · Dushmanta Sahu🇮🇳 · Rutuparna Rath🇮🇹 · Raghunath Sahoo🇮🇳 · Jean Cleymans🇿🇦

   The charged-particle transverse momentum spectra ($p_{\mathrm{T}}$-spectra) measured by the ALICE collaboration for $pp$ collisions at $\sqrt{s}=$ 7 and 13 TeV have been studied using a thermodynamically consistent form of Tsallis non-extensive statistics. The Tsallis distribution function is fitted to the $p_{\mathrm{T}}$-spectra and the results are analyzed as a function of final state charged-particle multiplicity for various light flavor and strange particles, such as ${\pi }^{\pm },K^{\pm },p+\bar{p},\varphi ,\Lambda +\bar{\Lambda },\Xi +\bar{\Xi },\Omega +\bar{\Omega }$. At the LHC energies, particles and antiparticles are produced in equal numbers. However, the equality of particle and antiparticle yields at the kinetic freeze-out may imply that they have the same but opposite chemical potential which is not necessarily zero. We use an alternative procedure that makes use of parameter redundancy, by introducing a finite chemical potential at the kinetic freeze-out stage. This article emphasizes the importance of the chemical potential of the system produced in $pp$ collisions at the LHC energies using the Tsallis distribution function which brings the system to a single freeze-out scenario.

   ↳ hep-phhep-exnucl-exnucl-thEPJA(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.