Tue·Jul 27, 2021Tuesday·July 27, 2021

1. 01*

   Measurement of the ${}^{18}$Ne($\alpha ,p$)${}^{21}$Na reaction with ANASEN at $E_{c.m.}=$ 2.5-4 MeV

   M. Anastasiou🇺🇸 · I. Wiedenhöver🇺🇸 · J. C. Blackmon · L. T. Baby🇺🇸 · D. D. Caussyn🇺🇸 · A. A. Hood🇺🇸 · E. Koshchiy🇺🇸 · J. C. Lighthall · K. T. Macon🇺🇸 · J. J. Parker · T. Rauscher🇨🇭 · N. Rijal🇺🇸

   The ${}^{18}$Ne($\alpha ,p$)${}^{21}$Na reaction plays a significant role in Type-I X-ray bursts. It is a major path in the breakout from the hot-CNO cycles to the synthesis of heavier elements in the $\alpha p$-- and $rp$-processes. An experiment to determine the cross section of this reaction was performed with the ANASEN active-target detector system, determining the cross section at energies between 2.5 and 4 MeV in the center-of-mass frame. The measured cross sections for reactions populating the ground state in ${}^{21}$Na are consistent with results obtained from the time-inverse reaction, but significantly lower than the previously published experimental data of direct measurements. The total cross sections are also compared with those derived from indirect methods and statistical-model calculations. This experiment establishes a new experimental data set on the excitation function of the ${}^{18}$Ne($\alpha ,p$)${}^{21}$Na reaction, revealing the significance of the excited states' contributions to the total reaction cross section and allowing to separate the contribution of the $(\alpha ,2p)$ reaction. The impact of the measured cross section on thermal reaction rates is discussed.

   nucl-exPRC(2022)·6 citations
2. 02*

   Results from a Pilot Study on the Measurement of Nuclear Fragmentation with NA61/SHINE at the CERN SPS: ${}^{11}\text{C}$ Production in $\text{C+p}$ Interactions at 13.5 A GeV/c

   Neeraj Amin (for the NA61 Collaboration)🇩🇪

   We report the analysis of data taken during a pilot run in 2018 to study the feasibility of nuclear fragmentation measurements with the NA61/SHINE experiment at the CERN SPS. These nuclear reactions are important for the interpretation of secondary cosmic-ray nuclei production (Li, Be, and B) in the Galaxy. The pilot data were taken with ${}^{12}\text{C}$ projectiles at a beam momentum of 13.5 A GeV/c and two fixed targets, polyethylene (C${}_2$H${}_4$) and graphite. The specific focus here is the measurement of total Boron (${}^{10}\text{B}$ and ${}^{11}\text{B}$) production cross section in $\text{C+p}$ interactions at 13.5 A GeV/c. The cosmic-ray nucleus ${}^{11}\text{C}$ is termed a `Ghost nucleus' on account of its short lifetime compared to the usual cosmic-ray diffusion time in the Galaxy and it ultimately decays to Boron as, ${}^{11}\text{C}{\to }^{11}\text{B}+{\beta }^{+}$. Therefore, precise knowledge of the production cross section of ${}^{11}\text{C}$ is very relevant for the understanding of Boron production in the Galaxy. We present a preliminary measurement of the fragmentation cross section of $\text{C+p}{\to }^{11}\text{C}$, which, together with our previously reported B-production cross section, provides a new constraint on Boron production in the Galaxy in the high-energy range relevant for modern space based cosmic-ray experiments like AMS-02.

   nucl-exastro-ph.HEPoS(2021)·7 citations
3. 03*

   Measurement of Spin Density Matrix Elements in $\Lambda (1520)$ Photoproduction at 8.2-8.8 GeV

   GlueX Collaboration: S. Adhikari🇺🇸 · C. S. Akondi🇺🇸 · M. Albrecht🇺🇸 · A. Ali🇩🇪 · M. Amaryan🇺🇸 · A. Asaturyan🇦🇲 · A. Austregesilo🇺🇸 · Z. Baldwin🇺🇸 · F. Barbosa🇺🇸 · J. Barlow🇺🇸 · E. Barriga🇺🇸 · R. Barsotti🇺🇸 and 133 other authors

   We report on the measurement of spin density matrix elements of the $\Lambda (1520)$ in the photoproduction reaction $\gamma p\to \Lambda (1520)K^{+}$, via its subsequent decay to $K^{-}p$. The measurement was performed as part of the GlueX experimental program in Hall D at Jefferson Lab using a linearly polarized photon beam with $E_{\gamma }=$ 8.2-8.8 GeV. These are the first such measurements in this photon energy range. Results are presented in bins of momentum transfer squared, $-(t-t_{\text{0}})$. We compare the results with a Reggeon exchange model and determine that natural exchange amplitudes are dominant in $\Lambda (1520)$ photoproduction.

   nucl-exhep-exPRC(2022)·16 citations
4. 04*

   LEGEND-1000 Preconceptual Design Report

   LEGEND Collaboration: N. Abgrall🇺🇸 · I. Abt🇩🇪 · M. Agostini🇬🇧 · A. Alexander🇬🇧 · C. Andreoiu · G.R. Araujo🇨🇭 · F.T. Avignone III🇺🇸 · W. Bae · A. Bakalyarov · M. Balata🇮🇹 · M. Bantel · I. Barabanov🇷🇺 and 251 other authors

   We propose the construction of LEGEND-1000, the ton-scale Large Enriched Germanium Experiment for Neutrinoless $\beta \beta$ Decay. This international experiment is designed to answer one of the highest priority questions in fundamental physics. It consists of 1000 kg of Ge detectors enriched to more than 90% in the ${}^{76}$Ge isotope operated in a liquid argon active shield at a deep underground laboratory. By combining the lowest background levels with the best energy resolution in the field, LEGEND-1000 will perform a quasi-background-free search and can make an unambiguous discovery of neutrinoless double-beta decay with just a handful of counts at the decay $Q$ value. The experiment is designed to probe this decay with a 99.7%-CL discovery sensitivity in the ${}^{76}$Ge half-life of $1.3\times 10^{28}$ years, corresponding to an effective Majorana mass upper limit in the range of 9-21 meV, to cover the inverted-ordering neutrino mass scale with 10 yr of live time.

   ↳ physics.ins-detnucl-ex333 citations
5. 05*

   The Regulated NiCu Cycles with the new ${}^{57}$Cu(p,$\gamma$)${}^{58}$Zn reaction rate and the Influence on Type-I X-Ray Bursts: GS 1826$-$24 Clocked Burster

   Yi Hua Lam · Ning Lu · Alexander Heger · Adam Michael Jacobs · Nadezda A. Smirnova · Teresa Kurtukian Nieto · Zac Johnston · Shigeru Kubono

   During the X-ray bursts of GS 1826$-$24, "clocked burster", the nuclear reaction flow that surges through the rapid-proton capture process path has to pass through the NiCu cycles before reaching the ZnGa cycles that moderate the further extent of hydrogen burning in the region above germanium and selenium isotopes. The ${}^{57}$Cu(p,$\gamma$)${}^{58}$Zn reaction located in the NiCu cycles plays an important role in influencing the burst light curves as found by Cyburt et al. (2016). We deduce the ${}^{57}$Cu(p,$\gamma$)${}^{58}$Zn reaction rate based on the experimentally determined important nuclear structure information, isobaric-multiplet-mass equation, and large-scale shell model calculations. Based on the isobaric-multiplet-mass equation, we propose a possible order of $1_1^{+}$ and $2_3^{+}$ dominant resonance states and constrain the resonance energy of the $1_2^{+}$ state. The latter reduces the contribution of the $1_2^{+}$ dominant resonance state. The new reaction rate is up to a factor of four lower than the Forstner et al. (2001) rate recommended by JINA REACLIB v2.2 at the temperature regime sensitive to clocked bursts of GS 1826$-$24. Using the simulation from the one-dimensional implicit hydrodynamic code, KEPLER, to model the thermonuclear X-ray bursts of GS 1826$-$24 clocked burster, we find that the new ${}^{57}$Cu(p,$\gamma$)${}^{58}$Zn coupled with the latest ${}^{56}$Ni(p,$\gamma$)${}^{57}$Cu and ${}^{55}$Ni(p,$\gamma$)${}^{56}$Cu reaction rates redistributes the reaction flow in the NiCu cycles and strongly influences the burst ash composition, whereas the ${}^{59}$Cu(p,$\alpha$)${}^{56}$Ni and ${}^{59}$Cu(p,$\gamma$)${}^{60}$Zn reactions suppress the influence of the ${}^{57}$Cu(p,$\gamma$)${}^{58}$Zn reaction and diminish the impact of nuclear reaction flow that by-passes the important ${}^{56}$Ni waiting point induced by the ${}^{55}$Ni(p,$\gamma$)${}^{56}$Cu reaction on burst light curve.

   ↳ astro-ph.HEnucl-exnucl-thApJ(2022)·0 citations
6. 06*

   Performance of ZnSe-based scintillators at low temperatures

   S. Galkin · I. Rybalka · L. Sidelnikova · A. Voloshinovskii · H. Kraus🇬🇧 · V. Mykhaylyk

   Applications that utilize scintillation detectors at low temperatures are growing in number. Many of these require materials with high light yield and a fast response. Here we report on the low-temperature characterisation of ZnSe doped with Al or Te, respectively. The X-ray luminescence and decay curves were measured over the 77- 295 K temperature range, and alpha particle excitation was used to examine scintillation light output and decay kinetics over the range 9-295 K. A significant improvement of the scintillation characteristics was observed at cooling below 100 K. The scintillation light yield of the crystals increases by a factor about two, and the decay time constant decreases by almost an order of magnitude to 0.3-0.4 microsec. These improvements enhance the potential of ZnSe-based crystals for application in cryogenic scintillation detectors of ionising radiation.

   ↳ physics.ins-detnucl-exJ.Lumin.(2021)·0 citations
7. 07*

   QLBT: A linear Boltzmann transport model for heavy quarks in a quark-gluon plasma of quasi-particles

   Feng-Lei Liu🇨🇳 · Wen-Jing Xing🇨🇳 · Xiang-Yu Wu🇨🇳 · Guang-You Qin🇨🇳 · Shanshan Cao🇨🇳 · Xin-Nian Wang🇨🇳

   We develop a new heavy quark transport model, QLBT, to simulate the dynamical propagation of heavy quarks inside the quark-gluon plasma (QGP) created in relativistic heavy-ion collisions. Our QLBT model is based on the linear Boltzmann transport (LBT) model with the ideal QGP replaced by a collection of quasi-particles to account for the non-perturbative interactions among quarks and gluons of the hot QGP. The thermal masses of quasi-particles are fitted to the equation of state from lattice QCD simulations using the Bayesian statistical analysis method. Combining QLBT with our advanced hybrid fragmentation-coalescence hadronization approach, we calculate the nuclear modification factor $R_{\mathrm{AA}}$ and the elliptic flow $v_2$ of $D$ mesons at the Relativistic Heavy-Ion Collider and the Large Hadron Collider. By comparing our QLBT calculation to the experimental data on the $D$ meson $R_{\mathrm{AA}}$ and $v_2$, we extract the heavy quark transport parameter $\hat{q}$ and diffusion coefficient $D_{\mathrm{s}}$ in the temperature range of $1-4T_{\mathrm{c}}$, and compare them with the lattice QCD results and other phenomenological studies.

   ↳ hep-phnucl-exnucl-thEPJC(2022)·42 citations
8. 08*

   Jet shape and redistribution of the lost energy from jets in Pb+Pb collisions at the LHC in a multiphase transport model

   Ao Luo🇨🇳 · Ya-Xian Mao🇨🇳 · Guang-You Qin🇨🇳 · En-Ke Wang🇨🇳 · Han-Zhong Zhang🇨🇳

   Jet-medium interaction involves two important effects: jet energy loss and medium response. The search for jet-induced medium excitations is one of the hot topics in jet quenching study in relativistic nuclear collisions. In this work, we perform a systematic study on how the lost energy from hard jets evolves with the bulk medium and redistributes in the final state of heavy-ion collisions via a multi-phase transport model. In particular, the ($\Delta \eta ,\Delta \varphi$) distribution of charged particles with respect to the jet axis and jet shape function are studied for various Pb+Pb collision centralities and for different transverse momentum intervals of charged particles. Our numerical result shows a strong enhancement of soft particles at large angles for Pb+Pb collisions relative to p+p collisions at the LHC, qualitatively consistent with recent CMS data. This indicates that a significant fraction of the lost energy from hard jets is carried by soft particles at large angles away from the jet axis.

   ↳ hep-phnucl-exnucl-thEPJC(2022)·17 citations
9. 09*

   Probing criticality with deep learning in relativistic heavy-ion collisions

   Yige Huang🇨🇳 · Long-Gang Pang🇨🇳 · Xiaofeng Luo🇨🇳 · Xin-Nian Wang🇨🇳

   Systems with different interactions could develop the same critical behaviour due to the underlying symmetry and universality. Using this principle of universality, we can embed critical correlations modeled on the 3D Ising model into the simulated data of heavy-ion collisions, hiding weak signals of a few inter-particle correlations within a large particle cloud. Employing a point cloud network with dynamical edge convolution, we are able to identify events with critical fluctuations through supervised learning, and pick out a large fraction of signal particles used for decision-making in each single event.

   ↳ nucl-thhep-exhep-phnucl-exPLB(2022)·20 citations
10. 10*

    The three point asymmetric cumulants in high multiplicity pp collisions

    B. Blok🇮🇱 · R. Segev (Technion)🇮🇱

    We study the influence of quantum interference and colour flow on three point correlations described by asymmetric cumulants in high multiplicity events in pp collisions. We use the model previously developed for the study of the collectivity in symmetric cumulants. We show that the resulting three point asymmetric cumulant is in qualitative agreement with the experimental data for the same parameters of the model as it was with the symmetric cumulants. Our results show that the initial state correlations must play a major role and may be even dominant in the explanation of the correlations in high multiplicity pp events.

    ↳ hep-phhep-exnucl-exnucl-thEPJC(2021)·1 citation
11. 11*

    Presolar grain isotopic ratios as constraints to nuclear and stellar parameters of AGB nucleosynthesis

    Sara Palmerini🇮🇹 · Maurizio Busso🇮🇹 · Diego Vescovi🇮🇹 · Eugenia Naselli · Angelo Pidatella · Riccardo Mucciola · Sergio Cristallo🇮🇹 · David Mascali · Alberto Mengoni🇮🇹 · Stefano Simonucci🇮🇹 · Simone Taioli🇮🇹

    Recent models for evolved Low Mass Stars (with $M\lesssim 3M_{\odot }$), undergoing the AGB phase assume that magnetic flux-tube buoyancy drives the formation of ${}^{13}$C reservoirs in He-rich layers. We illustrate their crucial properties, showing how the low abundance of ${}^{13}$C generated below the convective envelope hampers the formation of primary ${}^{14}$N and the ensuing synthesis of intermediate-mass nuclei, like ${}^{19}$F and ${}^{22}$Ne. In the mentioned models, their production is therefore of a purely secondary nature. Shortage of primary ${}^{22}$Ne has also important effects in reducing the neutron density. Another property concerns AGB winds, which are likely to preserve C-rich subcomponents, isolated by magnetic tension, even when the envelope composition is O-rich. Conditions for the formation of C-rich compounds are therefore found in stages earlier than previously envisaged. These issues, together with the uncertainties related to several nuclear physics quantities, are discussed in the light of the isotopic admixtures of s-process elements in presolar SiC grains of stellar origin, which provide important and precise constraints to the otherwise uncertain parameters. By comparing nucleosynthesis results with measured SiC data, it is argued that such a detailed series of constraints indicates the need for new measurements of weak interaction rates in ionized plasmas, as well as of neutron-capture cross sections, especially near the N = 50 and N = 82 neutron magic numbers. Nontheless, the peculiarity of our models allows us to achieve fits to the presolar grain data of a quality so far never obtained in previously published attempts.

    ↳ astro-ph.SRnucl-exnucl-thApJ(2021)·20 citations
12. 12*

    Spectroscopic factors in dripline nuclei

    J. Wylie🇺🇸 · J. Okołowicz🇵🇱 · W. Nazarewicz🇺🇸 · M. Płoszajczak🇫🇷 · S.M. Wang🇺🇸 · X. Mao🇨🇳 · N. Michel🇨🇳

    Single-nucleon knockout reaction studies of the proton-dripline nuclei ${}^9$C and ${}^{13}$O suggest an appreciable suppression of spectroscopic factors. In this work, we calculate the one-neutron and one-proton spectroscopic factors for the mirror pair ${}^9$C-${}^9$Li and ${}^{13}$O using two variants of the continuum shell model: the complex-energy Gamow Shell Model and the real-energy Shell Model Embedded in the Continuum. Our results indicate that the continuum effects strongly suppress the spectroscopic factors of well-bound orbits in the dripline systems, but have less impact on the spectroscopic factors of weakly-bound states.

    ↳ nucl-thnucl-exPRC(2021)·25 citations
13. 13*

    Spinless mesons and glueballs mixing patterns in SU(3) flavor limit

    Amir H. Fariborz🇺🇸 · Mars Lyukova🇺🇸

    We present a detailed study of the interactions among scalar and pseudoscalar mesons and glueballs within the framework of the generalized linear sigma model in the SU(3) flavor limit. The basis of our approach is to develop a global understanding of light scalar and pseudoscalar mesons (up to around 2 GeV) and thereby explore the underlying mixings among composite quark matter fields and glueballs. The chiral sector of the Lagrangian is formulated in terms of two chiral nonets representing quark-antiquarks and tetraquarks (in the leading order, this sector contains terms with eight or fewer number of quak or antiquark lines). The Lagrangian also contains a sector that represents scalar and pseudoscalar glueballs and their interactions with the matter chiral fields, in a manner that the axial and trace anomalies of QCD are exactly realized. In this construct, the model has two scalar octets and two pdeudoscalar octets (each a linear combination of two- and four-quark components), as well as three scalar SU(3) singlets and three pseudoscalar SU(3) singlets (each a linear combination of two- and four-quark components as well as a glueball component). With the inputs of the experimental masses of $a_0(980)$, $a_0(1450)$, and the masses of $\pi (137)$, $\pi (1300)$ and their decay constants, we perform an extensive numerical simulation to determine the boundaries of the parameter space of the model. We further incorporate experimental data on the mass spectrum of eta states as well as on several decay widths and decay ratios of $f_0$ states to zoom in on the parameter space and make predictions for the substructure of pseudoscalar and scalar SU(3) octets and singlets as well as for the pseudoscalar and scalar glueball masses. We find the scalar and pseudoscalar glueball masses around 1.6 and 2.0 GeV, respectively.

    ↳ hep-phhep-exhep-latnucl-ex+1NPA(2021)·7 citations
14. 14*

    Three-dimensional imaging in nuclei

    Mishary Alrashed🇺🇸 · Daniele Anderle🇨🇳 · Zhong-Bo Kang🇺🇸 · John Terry🇺🇸 · Hongxi Xing🇨🇳

    We perform the first simultaneous global QCD extraction of the transverse momentum dependent (TMD) parton distribution functions and the TMD fragmentation functions in nuclei. We have considered the world set of data from semi-inclusive electron-nucleus deep inelastic scattering and Drell-Yan di-lepton production. In total, this data set consists of 126 data points from HERMES, Fermilab, RHIC and LHC. Working at next-to-leading order and next-to-next-to-leading logarithmic accuracy, we achieve a ${\chi }^2/dof=1.045$. In this analysis, we quantify the broadening of TMDs in nuclei comparing with those in free nucleons for the first time. We also make predictions for the ongoing JLab 12 GeV program and future EIC measurements.

    ↳ hep-phhep-exnucl-exnucl-thPRL(2022)·33 citations
15. 15*

    Applying machine learning to determine impact parameter in nuclear physics experiments

    C.Y. Tsang🇺🇸 · Yongjia Wang🇨🇳 · M.B. Tsang🇺🇸 · J. Estee · T. Isobe🇯🇵 · M. Kaneko · M. Kurata-Nishimura🇯🇵 · J.W. Lee🇰🇷 · Fupeng Li🇨🇳 · Qingfeng Li🇨🇳 · W.G. Lynch🇺🇸 · T. Murakami🇯🇵 and 5 other authors

    Machine Learning (ML) algorithms have been demonstrated to be capable of predicting impact parameter in heavy-ion collisions from transport model simulation events with perfect detector response. We extend the scope of ML application to experimental data by incorporating realistic detector response of the S$\pi$RIT Time Projection Chamber into the heavy-ion simulation events generated from the UrQMD model to resemble experimental data. At 3 fm, the predicted impact parameter is 2.8 fm if simulation events with perfect detector is used for training and testing; 2.4 fm if detector response is included in the training and testing, and 5.8 fm if ML algorithms trained with perfect detector is applied to testing data that has included detector response. The last result is not acceptable illustrating the importance of including the detector response in developing the ML training algorithm. We also test the model dependence by applying the algorithms trained on UrQMD model to simulated events from four different transport models as well as using different input parameters on UrQMD model. Using data from Sn+Sn collisions at E/A=270 MeV, the ML determined impact parameters agree well with the experimentally determined impact parameter using multiplicities, except in the very central and very peripheral regions. ML selects central collision events better and allows impact parameters determination beyond the sharp cutoff limit imposed by experimental methods.

    ↳ physics.ins-detnucl-ex12 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.