Tue·Jan 25, 2022Tuesday·January 25, 2022

1. 01*

   Neutron transfer reactions on the ground state and isomeric state of a 130Sn beam

   K.L. Jones · A. Bey🇫🇷 · S. Burcher · J.M. Allmond🇺🇸 · A. Galindo-Uribarri🇺🇸 · D.C. Radford🇺🇸 · S. Ahn · A. Ayres · 1 D.W. Bardayan🇺🇸 · J. A. Cizewski · R.F. Garcia Ruiz🇺🇸 · M.E. Howard🇦🇺 and 14 other authors

   The structure of nuclei around the neutron-rich nucleus 132Sn is of particular interest due to the vicinity of the Z = 50 and N = 82 shell closures and the r-process nucleosynthetic path. Four states in 131Sn with a strong single-particle-like component have previously been studied via the (d,p) reaction, with limited excitation energy resolution. The 130Sn(9Be,8Be)131Sn and 130Sn(13C,12C)131Sn single-neutron transfer reactions were performed in inverse kinematics at the Holifield Radioactive Ion Beam Facility using particle-gamma coincidence spectroscopy. The uncertainties in the energies of the single-particle-like states have been reduced by more than an order of magnitude using the energies of gamma rays. The previous tentative Jpi values have been confirmed. Decays from high-spin states in 131Sn have been observed following transfer on the isomeric component of the 130Sn beam. The improved energies and confirmed spin-parities of the p-wave states important to the r-process lead to direct-semidirect cross-sections for neutron capture on the ground state of 130Sn at 30 keV that are in agreement with previous analyses. A similar assessment of the impact of neutron-transfer on the isomer would require significant nuclear structure and reaction theory input. There are few measurements of transfer reaction on isomers, and this is the first on an isomer in the 132Sn region.

   nucl-exPRC(2022)·7 citations
2. 02*

   A new kaonic helium measurement in gas by SIDDHARTINO at the DA{\Phi}NE collider

   D Sirghi🇮🇹 · F Sirghi🇮🇹 · F Sgaramella🇮🇹 · M Bazzi🇮🇹 · D Bosnar🇭🇷 · M Bragadireanu🇷🇴 · M Carminati🇮🇹 · M Cargnelli🇦🇹 · A Clozza🇮🇹 · G Deda🇮🇹 · L De Paolis🇮🇹 · R Del Grande🇮🇹 and 21 other authors

   The SIDDHARTINO experiment at the DA{\Phi}NE Collider of INFN-LNF, the pilot run for the SIDDHARTA-2 experiment which aims to perform the measurement of kaonic deuterium transitions to the fundamental level, has successfully been concluded. The paper reports the main results of this run, including the optimization of various components of the apparatus, among which the degrader needed to maximize the fraction of kaons stopped inside the target, through measurements of kaonic helium transitions to the 2p level. The obtained shift and width values are {\epsilon}_2p = E_exp-E_e.m = 0.2 {\pm} 2.5(stat) {\pm} 2(syst) eV and {\Gamma}_2p = 8 {\pm} 10 eV (stat), respectively. This new measurement of the shift, in particular, represents the most precise one for a gaseous target and is expected to contribute to a better understanding of the kaon-nuclei interaction at low energy.

   nucl-exphysics.ins-detJ.Phys.G(2022)·28 citations
3. 03*

   Simulated Thick, Fully-Depleted CCD Exposures Analyzed with Deep Learning Techniques

   C. Britt · E. Church🇺🇸 · T. Hossbach🇺🇸 · B. Loer🇺🇸 · R. Saldanha🇺🇸 · N. Sinha🇮🇳 · K. Woodruff🇺🇸

   Thick, Charge Coupled Devices (CCDs) have recently been explored for applied physics, such as nuclear explosion monitoring, and dark matter detection purposes. When run in fully-depleted mode, these devices are sensitive detectors for energy depositions by a variety of primary particles. In this study we are interested in applying the Deep Learning (DL) technique known as panoptic segmentation to simulated CCD images to identify, attribute and measure energy depositions from radioisotopes of interest. We simulate CCD exposures of a chosen radioxenon isotope, ${}^{135}$Xe, and overlay a simulated cosmic muon background appropriate for a surface-lab. We show that with this DL technique we can reproduce the beta spectrum to good accuracy, while suffering expected confusion with same-topology gammas and conversion electrons and identifying cosmic muons less than optimally.

   ↳ physics.ins-detnucl-ex0 citations
4. 04*

   A theoretical overview of isospin and EOS effects in heavy-ion reactions at intermediate energies

   Bao-An Li🇺🇸 · Bao-Jun Cai🇨🇳 · Lie-Wen Chen🇨🇳 · Wen-Jie Xie🇨🇳 · Jun Xu🇨🇳 · Nai-Bo Zhang🇨🇳

   The isospin dependence of in-medium nuclear effective interactions is a fundamental issue in nuclear physics and has broad ramifications in astrophysics. Its uncertainties, especially the difference of neutron-proton interactions in the isosinglet and isotriplet channels, affect significantly the density and momentum dependence of the isovector single-nucleon potential and nucleon-nucleon short-range correlation in neutron-rich matter. Consequently, the neutron-proton effective mass splitting and the density dependence of nuclear symmetry energy are still rather uncertain. Heavy-ion reactions especially those involving rare isotopes is a useful tool for probing the isospin dependence of nuclear effective interactions through (1) the neutron-skin in coordinate and proton-skin in momentum of the initial state of colliding nuclei, (2) the density and momentum dependence of especially the isovector nuclear mean-field as well as (3) the isospin dependence of in-medium nucleon-nucleon cross sections. Observations of neutron stars especially since GW1710817 have also helped us significantly in understanding the isospin dependence of nuclear effective interactions. {\it We summarize here a review talk on these issues given at the 2021 International Workshop on multi-facets of EOS and Clustering. For details we refer the readers to the original publications and references therein}.

   ↳ nucl-thastro-ph.HEnucl-exNuovo Cim.C(2022)·8 citations
5. 05*

   ${\rm Y}$ and ${\eta }_b$ mass shifts in nuclear matter and the nucleus bound states

   G. N. Zeminiani🇧🇷

   The ${\rm Y}$ and ${\eta }_b$ as well as $B^{\ast }$ meson mass shifts (scalar potentials) are estimated for the first time in symmetric nuclear matter. The main interest is, whether or not the strengths of the bottomonium-nuclear matter and charmonium-nuclear matter interactions are similar or very different, in the range of a few tens of MeV at the nuclear matter saturation density. This is because, each (${\rm Y},J/\Psi$) and (${\eta }_c,{\eta }_b$) meson group is usually assumed to have very similar properties based on the heavy charm and bottom quark masses. The estimate for the ${\rm Y}$ is made using an SU(5) effective Lagrangian density, by studying the $BB$, $B{B}^{\ast }$, and $B^{\ast }{B}^{\ast }$ meson loop contributions for the self-energy in free space and in nuclear medium. As a result, only the $BB$ meson loop contribution is included as our minimal prediction. As for the ${\eta }_b$, is included only the $B{B}^{\ast }$ meson loop contribution in the self-energy, to be consistent with the minimal prediction for the ${\rm Y}$. The in-medium masses of the $B$ and $B^{\ast }$ mesons appearing in the self-energy loops are calculated by the quark-meson coupling model. Form factors are used to regularize the loop integrals with a wide range of the cutoff mass values. The results suggest that both ${\rm Y}$ and ${\eta }_b$ should form bound states with a variety of nuclei considered in this study, for which the ${\rm Y}$-nucleus and ${\eta }_b$-nucleus bound state energies are calculated. The results also show an appreciable difference between the bottomonium-nuclear matter and charmonium-nuclear matter interaction strengths. Are also studied the ${\rm Y}$ and ${\eta }_b$ mass shifts in a heavy quark (heavy meson) symmetry limit. In addition, an initial study was done to investigate the influence of the choice of the form factor on our predictions.

   ↳ nucl-thhep-exhep-phnucl-ex5 citations
6. 06*

   Coupled-channels calculations for nuclear reactions: from exotic nuclei to superheavy elements

   K. Hagino🇯🇵 · K. Ogata🇯🇵 · A.M. Moro🇪🇸

   Atomic nuclei are composite systems, and they may be dynamically excited during nuclear reactions. Such excitations are not only relevant to inelastic scattering but they also affect other reaction processes such as elastic scattering and fusion. The coupled-channels approach is a framework which can describe these reaction processes in a unified manner. It expands the total wave function of the system in terms of the ground and excited states of the colliding nuclei, and solves the coupled Shrödinger equations to obtain the $S$-matrix, from which several cross sections can be constructed. This approach has been a standard tool to analyze experimental data for nuclear reactions. In this paper, we review the present status and the recent developments of the coupled-channels approach. This includes the microscopic coupled-channels method and its application to cluster physics, the continuum discretized coupled-channels (CDCC) method for breakup reactions, the semi-microscopic approach to heavy-ion subbarrier fusion reactions, the channel coupling effects on nuclear astrophysics and syntheses of superheavy elements, and inclusive breakup and incomplete fusion reactions of weakly-bound nuclei.

   ↳ nucl-thnucl-exPPNP(2022)·61 citations
7. 07*

   Electromagnetic anomaly in the presence of electric and chiral magnetic conductivities in relativistic heavy-ion collisions

   Irfan Siddique🇨🇳 · Shanshan Cao🇨🇳 · Uzma Tabassam🇵🇰 · Mohsin Saeed🇵🇰 · Muhammad Waqas🇨🇳

   We study the spacetime evolution of electric $(\text{E})$ and magnetic $(\text{B})$ fields along with the electromagnetic anomaly $(\text{E}\cdot \text{B})$ in the presence of electric ($\sigma$) and chiral magnetic (${\sigma }_{\chi }$) conductivities in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$~GeV. By comparing to the Lienard-Wiechert solutions with zero conductivities, we observe a symmetry breaking of the electromagnetic field in a conducting medium with respect to the reaction plane. The decay of the field is also significantly decelerated after the conductivities are introduced. Similar effects are also found for the dipole structure of $\text{E}\cdot \text{B}$ as well as the quadrupole structure of $(\text{E}\cdot \text{B})\text{B}$, which may finally affect the charge separation of the elliptic flow coefficient of hadrons observed in high-energy nuclear collisions.

   ↳ nucl-thhep-phnucl-exPRC(2022)·14 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.