Tue·Dec 7, 2021Tuesday·December 7, 2021

1. 01*

   The Emission Order of Hydrogen Isotopes via Correlation Functions in 30 MeV/u Ar+Au Reactions

   Yijie Wang🇨🇳 · Fenhai Guan🇨🇳 · Qianghua Wu · Xinyue Diao🇨🇳 · Yan Huang🇨🇳 · Liming Lyu · Yuhao Qin🇨🇳 · Zhi Qin🇨🇳 · Dawei Si🇨🇳 · Zhen Bai🇨🇳 · Fangfang Duan🇨🇳 · Limin Duan🇨🇳 and 24 other authors

   The intensity interferometry is applied as a chronometer of the particle emission of hydrogen isotopes from the intermediate velocity source formed in ${}^{40}$Ar+${}^{197}$Au reactions at 30 MeV/u. The dynamic emission order of ${\tau }_{\mathrm{p}}>{\tau }_{\mathrm{d}}>{\tau }_{\mathrm{t}}$ is evidenced via the correlation functions of nonidentical particle pairs. Assuming the similar source size, the same emission order is inferred from the correlation functions of identical particle pairs, where ${\tau }_{\mathrm{p}}\approx 100fm/c$ is extracted by the fit of Koonin-Pratt equation to p-p correlation function. Transport model simulations demonstrate that the dynamic emission order of light charged particles depends on the stiffness of the nuclear symmetry energy.

   nucl-exPLB(2022)·30 citations
2. 02*

   Quantum Control of Two Critically Dressed Spin 1/2 Species in Magnetic Fluctuations

   Raymond Tat · Christopher Swank🇺🇸

   The neutron electric dipole moment experiment at the Spallation Neutron Source (nEDM@SNS experiment) proposes to measure the nEDM using the spin-dependent capture cross section of neutrons on ${}^3$He. The critical dressing mode of this experiment uses an oscillating magnetic field to dress the gyromagnetic ratios of neutrons and ${}^3$He to the same value. While this technique grants increased sensitivity to the nEDM by improving the signal-to-noise ratio, this mode of measurement also introduces additional noise from the power supply used to drive the dressing field. This can lead to randomly fluctuating magnetic fields which cause the spins of neutrons and ${}^3$He to drift apart over time. Here we use second-order time-dependent perturbation theory to compute relaxation and frequency shifts due to fluctuations in the dressing field in terms of the magnetic field noise power spectrum and compare these calculations to numerical solutions obtained by integrating the Bloch equations. We then use these results to develop mitigation strategies for this type of noise. Furthermore, we report on spin dressing modulation techniques that significantly amplify coherence times for the critically dressed system, and attempt to quantify the coherence time achievable.

   ↳ physics.ins-detcond-mat.othernucl-exPRA(2022)·4 citations
3. 03*

   Lattice QCD Determination of the Bjorken-$x$ Dependence of Parton Distribution Functions at Next-to-next-to-leading Order

   Xiang Gao🇨🇳 · Andrew D. Hanlon🇺🇸 · Swagato Mukherjee🇺🇸 · Peter Petreczky🇺🇸 · Philipp Scior🇺🇸 · Sergey Syritsyn🇺🇸 · Yong Zhao🇺🇸

   We report the first lattice QCD calculation of pion valence quark distribution with next-to-next-to-leading order perturbative matching correction, which is done using two fine lattices with spacings $a=0.04$ fm and $0.06$ fm and valence pion mass $m_{\pi }=300$ MeV, at boost momentum as large as $2.42$ GeV. As a crucial step to control the systematics, we renormalize the pion valence quasi distribution in the recently proposed hybrid scheme, which features a Wilson-line mass subtraction at large distances in coordinate space, and develop a procedure to match it to the $\overline{\mathrm{MS}}$ scheme. We demonstrate that the renormalization and the perturbative matching in Bjorken-$x$ space yield a reliable determination of the valence quark distribution for $0.03\lesssim x\lesssim 0.80$ with 5-20\% uncertainties.

   ↳ hep-lathep-exhep-phnucl-ex+1PRL(2022)·96 citations
4. 04*

   Machine Learning in Nuclear Physics

   Amber Boehnlein🇺🇸 · Markus Diefenthaler🇺🇸 · Cristiano Fanelli🇺🇸 · Morten Hjorth-Jensen🇺🇸 · Tanja Horn🇺🇸 · Michelle P. Kuchera🇺🇸 · Dean Lee🇺🇸 · Witold Nazarewicz🇺🇸 · Kostas Orginos🇺🇸 · Peter Ostroumov🇺🇸 · Long-Gang Pang🇨🇳 · Alan Poon🇺🇸 and 6 other authors

   Advances in machine learning methods provide tools that have broad applicability in scientific research. These techniques are being applied across the diversity of nuclear physics research topics, leading to advances that will facilitate scientific discoveries and societal applications. This Review gives a snapshot of nuclear physics research which has been transformed by machine learning techniques.

   ↳ nucl-thcs.LGhep-exnucl-exRMP(2022)·252 citations
5. 05*

   Ab initio nucleon-nucleus elastic scattering with chiral effective field theory uncertainties

   R. B. Baker🇺🇸 · B. McClung · Ch. Elster🇺🇸 · P. Maris🇺🇸 · S. P. Weppner · M. Burrows🇺🇸 · G. Popa

   Background: Effective interactions for nucleon-nucleus ($NA$) elastic scattering from first principles require the use of the same nucleon-nucleon ($NN$) interaction in the structure and reaction calculations, and a consistent treatment of the relevant operators at each order. Purpose: Truncation uncertainties of chiral $NN$ forces have been studied for scattering observables in few-body systems and for bound state properties of light nuclei. We extend this to $NA$ elastic scattering. Methods: With the spectator expansion of multiple scattering theory and the no-core shell model, we use a chiral interaction from the LENPIC collaboration to consistently calculate the leading order effective $NA$ interaction up to third chiral order (N2LO) and extract elastic scattering observables. We quantify the chiral truncation error using pointwise and correlated methods. Results: We analyze proton-${}^{16}$O and neutron-${}^{12}$C elastic scattering observables between 65 and 185 MeV projectile kinetic energy. We find qualitatively similar results for the chiral truncation uncertainties as in few-body systems, which we assess using similar diagnostic tools. The order-by-order convergence of the scattering observables for ${}^{16}$O and ${}^{12}$C is reasonable near 100 MeV, but for higher energies the expansion parameter becomes too large to converge. We find a near-perfect correlation between the neutron differential cross section and the $NN$ Wolfenstein amplitudes for small momentum transfers. Conclusions: The tools used to study the convergence of a chiral $NN$ interaction in few-body systems can be applied to $NA$ scattering with minor changes. The $NN$ interaction used here gives a good description of ${}^{16}$O and ${}^{12}$C scattering observables as low as 65 MeV. The very forward direction of the neutron differential cross section mirrors the behavior of the $NN$ interaction amazingly well.

   ↳ nucl-thnucl-exPRC(2022)·11 citations
6. 06*

   Searching for the axion-like particle at the EIC

   Yandong Liu🇨🇳 · Bin Yan🇺🇸

   The axion-like particle (ALP) is a well motivated new particle candidate of beyond the Standard Model. In this work, we propose to probe the ALP through the photon fusion scattering at the upcoming Electron-Ion Collider (EIC) with electron and proton energy $E_e=20\mathrm{GeV}$ and $E_p=250\mathrm{GeV}$. It shows that we could constrain the effective coupling strength between ALP and photons to be $0.2{\mathrm{TeV}}^{-1}$ at $2\sigma$ confidence level with the integrated luminosity of $300{\mathrm{fb}}^{-1}$ for the mass range $m_a\in [5,40]\mathrm{GeV}$. Such bound could be much improved if we consider the nucleus beam at the EIC. We also demonstrate that the limits from the EIC could be stronger than the off $Z$-pole measurement at the LEP and the Light-by-Light scattering with pp collision at the LHC.

   ↳ hep-phhep-exnucl-exCPC(2023)·39 citations
7. 07*

   Production of $\Omega NN$ and $\Omega \Omega N$ in ultra-relativistic heavy ion collisions

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

   Even though lots of $\Lambda$-hypernuclei have been found and measured, multi-strangeness hypernuclei consisting of $\Omega$ are not yet discovered. The studies of multi-strangeness hypernuclei help us further understand the interaction between hyperons and nucleons. Recently the $\Omega N$ and $\Omega \Omega$ interactions as well as binding energies were calculated by the HAL-QCD's lattice Quantum Chromo-Dynamics (LQCD) simulations and production rates of $\Omega$-dibaryon in Au + Au collisions at RHIC and Pb + Pb collisions at LHC energies were estimated by a coalescence model. The present work discusses the production of more exotic triple-baryons including $\Omega$, namely $\Omega NN$ and $\Omega \Omega N$ as well as their decay channels. A variation method is used in calculations of bound states and binding energy of $\Omega NN$ and $\Omega \Omega N$ with the potentials from the HAL-QCD's results. The productions of $\Omega NN$ and $\Omega \Omega N$ are predicted by using a blast-wave model plus coalescence model in ultra-relativistic heavy-ion collisions at $\sqrt{s_{NN}}=200$ GeV and $2.76$ TeV. Furthermore, plots for baryon number dependent yields of different baryons ($N$ and $\Omega$), their dibaryons and hypernuclei are made and the production rate of a more exotic tetra-baryon ($\Omega \Omega NN$) is extrapolated.

   ↳ hep-phnucl-exnucl-thEPJC(2022)·25 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.