Mon·May 24, 2021Monday·May 24, 2021

1. 01*

   Nucleon-Nucleon Interaction ib the Singlet State at Low Energy

   S. B. Borzakov🇷🇺

   It is possible to describe the scattering and the radiative capture with help of a Breit-Wigner resonance with negative energy.

   nucl-exnucl-th2 citations
2. 02*

   Quasi-elastic electron scattering with KIDS nuclear energy density functional

   Hana Gil🇰🇷 · Chang Ho Hyun🇰🇷 · Kyungsik Kim🇰🇷

   Isoscalar and isovector effective masses of the nucleon in nuclear medium are explored in the quasi-elastic electron scattering of nuclei with KIDS (Korea-IBS-Daegu-SKKU) density functional model. Effective masses are varied in the range (0.7 ~ 1.0)$M$ where $M$ is the mass of the nucleon in free space. Parameters in the KIDS functional are adjusted to nuclear matter equation of state, energy and radius of selected nuclei, and effective mass of nucleons. Hartree-Fock equation is solved to obtain the wave functions of the nucleon in target nuclei, and they are plugged in the calculation of electron-nucleus scattering cross sections at the energies of incident electrons 300 MeV ~ 2.5 GeV. Theoretical prediction agrees well with measurement. Dependence on the effective mass is evident: cross section tends to increase with small isoscalar effective masses. However, effect of isovector effective mass is negligible. Spectroscopic factors are estimated for the protons in the outermost shells of ${}^{16}$O, ${}^{40}$Ca, and ${}^{208}$Pb. Results are consistent with the values in the literature.

   ↳ nucl-thnucl-exPRC(2021)·17 citations
3. 03*

   Double strangeness ${\Xi }^{-}$ production as a probe of nuclear equation of state at high densities

   Gao-Chan Yong🇨🇳 · Zhi-Gang Xiao🇨🇳 · Yuan Gao🇨🇳 · Zi-Wei Lin🇺🇸

   Double strangeness ${\Xi }^{-}$ production in Au+Au collisions at 2, 4, and 6 GeV/nucleon incident beam energies is studied with the pure hadron cascade version of a multi-phase transport model. It is found that due to larger nuclear compression, the model with the soft equation of state (EoS) gives larger yields of both single strangeness ($K^{+}$ and $\Lambda +{\Sigma }^0$) and double strangeness ${\Xi }^{-}$. The sensitivity of the double strangeness ${\Xi }^{-}$ to the EoS is evidently larger than that of $K^{+}$ or $\Lambda +{\Sigma }^0$ since the phase-space distribution of produced ${\Xi }^{-}$ is more compact compared to those of the single strangeness. The larger sensitivity of the yields ratio of ${\Xi }^{-}$ to the EoS from heavy and light systems is kept compared to that of the single strangeness. The study of ${\Xi }^{-}$ production in relativistic heavy-ion collisions provides an alternative for the ongoing heavy-ion collision program at facilities worldwide for identifying the EoS at high densities, which is relevant to the investigation of the phase boundary and onset of deconfinement of dense nuclear matter.

   ↳ nucl-thnucl-exPLB(2021)·26 citations
4. 04*

   Precision measurement of the ${}^{43}$Ca${}^{+}$ nuclear magnetic moment

   R. K. Hanley🇬🇧 · D. T. C. Allcock🇬🇧 · T. P. Harty🇬🇧 · M. A. Sepiol🇬🇧 · D. M. Lucas🇬🇧

   We report precision measurements of the nuclear magnetic moment of \textsuperscript{43}Ca\textsuperscript{+}, made by microwave spectroscopy of the 4s ${}^2$S${}_{1/2}$ $|F=4,M=0⟩\to |F=3,M=1⟩$ ground level hyperfine clock transition at a magnetic field of $\approx$ 146 G, using a single laser-cooled ion in a Paul trap. We measure a clock transition frequency of $f=3199941076.920\pm 0.046$ Hz, from which we determine ${\mu }_I/{\mu }_{\mathrm{N}}=-1.315350(9)(1)$, where the uncertainty (9) arises from uncertainty in the hyperfine $A$ constant, and the (1) arises from the uncertainty in our measurement. This measurement is not corrected for diamagnetic shielding due to the bound electrons. We make a second measurement which is less precise but agrees with the first. We use our ${\mu }_I$ value, in combination with previous NMR results, to extract the change in shielding constant of calcium ions due to solvation in D${}_2$O: $\Delta \sigma =-0.00022(1)$.

   ↳ physics.atom-phnucl-exquant-phPRA(2021)·2 citations
5. 05*

   Stopping powers of LiF thin films deposited onto self-supporting Al foils for swift protons

   Smail Damache🇩🇿 · Djamel Moussa🇩🇿 · Saad Ouichaoui🇩🇿

   The energy losses of ~(0.273-3.334) MeV protons in Lithium Fluoride thin films deposited by vacuum evaporation onto self-supporting Al foils have been measured using the transmission method. The thicknesses of selected and used Lithium Fluoride/Al target samples were accurately determined via systematic energy loss measurements for alpha particles from a very thin mixed 241Am/239Pu/233U radioactive source. The samples were investigated in detail for their stoichiometry and their impurity contents by backscattering Rutherford spectrometry and nuclear reaction analysis. Then, Lithium Fluoride stopping powers have been determined with overall relative uncertainty of less than 2.7% arising mainly from errors in the determination of target sample thicknesses. These S(E) data are reported and discussed in comparison to previous experimental data sets from the literature and to values calculated by the Sigmund-Schinner binary collision stopping theory both for molecular Lithium Fluoride and for the Lithium Fluoride compound assuming the Bragg's additivity rule. Our S(E) data show to be in excellent agreement with the latter theory for molecular Lithium Fluoride over the whole proton energy range explored, which supports the use of modified hydrogenic wave functions for evaluating atomic shell corrections in the case of low-Z2 target materials. In contrast, they exhibit a slightly increasing deviation from theoretical values derived for the Lithium Fluoride compound with assuming stopping force additivity as the proton energy decreases from ~400 Kev towards lower proton velocities.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.B(2013)·2 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.