Fri·Oct 14, 2016Friday·October 14, 2016

1. 01*

   Higher order moments of net-charge and multiplicity distributions in p+p interactions at SPS energies from NA61/SHINE

   Maja Mackowiak-Pawlowska (for the NA61/SHINE Collaboration)🇵🇱

   NA61/SHINE at the CERN SPS is a fixed-target experiment pursuing a rich physics program including measurements for heavy ion, neutrino and cosmic ray physics. The main goal of the ion program is to study the properties of the onset of deconfinement and to search for the signatures of the critical point. A specific property of the critical point, the increase in the correlation length, makes fluctuations its basic signal. Higher order moments of suitable observables are of special interest as they are more sensitive to the correlation length than typically studied second order moments. In this contribution preliminary results on higher order fluctuations of negatively charged hadron multiplicity and net-charge in p+p interactions are shown. The new data are compared with model predictions.

   nucl-exActa Phys.Polon.Supp.(2017)·11 citations
2. 02*

   Activation cross-sections of proton induced reactions on vanadium in the 37-65 MeV energy range

   F. Ditrói · F. Tárkányi · S. Takács · A. Hermanne

   Experimental excitation functions for proton induced reactions on natural vanadium in the 37-65 MeV energy range were measured with the activation method using a stacked foil irradiation technique. By using high resolution gamma spectrometry cross-section data for the production of ${}^{51,48}$Cr, ${}^{48}$V, ${}^{48,47,46,44m,44g,43}$Sc and ${}^{43,42}$K were determined. Comparisons with the earlier published data are presented and results predicted by different theoretical codes (EMPIRE and TALYS) are included. Thick target yields were calculated from a fit to our experimental excitation curves and compared with the earlier experimental yield data. Depth distribution curves to be used for thin layer activation (TLA) are also presented.

   nucl-exNucl.Instrum.Meth.B(2016)·5 citations
3. 03*

   Experimental Overview of Open Heavy Flavor

   Kai Schweda🇩🇪

   These are the proceedings of the experimental overview of the production of open heavy flavor at the international conference Strangeness in Quark Matter 2016. Instead of a comprehensive overview, I focus on a few topics which the reader might find particularly interesting.

   nucl-exhep-exJ.Phys.Conf.Ser.(2017)·1 citation
4. 04*

   Solar Axion Search Technique with Correlated Signals from Multiple Detectors

   Wenqin Xu🇺🇸 · Steven R. Elliott🇺🇸

   The coherent Bragg scattering of photons converted from solar axions inside crystals would boost the signal for axion-photon coupling enhancing experimental sensitivity for these hypothetical particles. Knowledge of the scattering angle of solar axions with respect to the crystal lattice is required to make theoretical predications of signal strength. Hence, both the lattice axis angle within a crystal and the absolute angle between the crystal and the Sun must be known. In this paper, we examine how the experimental sensitivity changes with respect to various experimental parameters. We also demonstrate that, in a multiple-crystal setup, knowledge of the relative axis orientation between multiple crystals can improve the experimental sensitivity, or equivalently, relax the precision on the absolute solar angle measurement. However, if absolute angles of all crystal axes are measured, we find that a precision of 2-4 degrees will suffice for an energy resolution of ${\sigma }_E=0.04\mathrm{E}$ and a flat background. Finally, we also show that, given a minimum number of detectors, a signal model averaged over angles can substitute for precise crystal angular measurements, with some loss of sensitivity.

   ↳ hep-exnucl-exphysics.ins-detAstropart.Phys.(2017)·13 citations
5. 05*

   Inversion doublets of reflection-asymmetric clustering in 28Si and their isoscalar monopole and dipole transitions

   Y. Chiba🇯🇵 · Y. Taniguchi🇯🇵 · M. Kimura🇯🇵

   [Background] Various cluster states of astrophysical interest are expected to exist in the excited states of ${}^{28}\mathrm{Si}$. However, they have not been identified firmly, because of the experimental and theoretical difficulties. [Purpose] To establish the ${}^{24}$Mg+$\alpha$, ${}^{16}$O+${}^{12}$C and ${}^{20}$Ne+2$\alpha$ cluster bands, we theoretically search for the negative-parity cluster bands that are paired with the positive-parity bands to constitute the inversion doublets. We also offer the isoscalar monopole and dipole transitions as a promising probe for the clustering. We numerically show that these transition strengths from the ground state to the cluster states are very enhanced. [Method] The antisymmetrized molecular dynamics with Gogny D1S effective interaction is employed to calculate the excited states of ${}^{28}\mathrm{Si}$. The isoscalar monopole and dipole transition strengths are directly evaluated from wave functions of the ground and excited states. [Results] Negative-parity bands having ${}^{24}$Mg+$\alpha$ and ${}^{16}$O+${}^{12}$C cluster configurations are obtained in addition to the newly calculated ${}^{20}$Ne+2$\alpha$ cluster bands. All of them are paired with the corresponding positive-parity bands to constitute the inversion doublets with various cluster configurations. The calculation show that the band-head of the ${}^{24}$Mg+$\alpha$ and ${}^{20}$Ne+2$\alpha$ cluster bands are strongly excited by the isoscalar monopole and dipole transitions. [Conclusions] The present calculation suggests the existence of the inversion doublets with the ${}^{24}$Mg+$\alpha$, ${}^{16}$O+${}^{12}$C and ${}^{20}$Ne+2$\alpha$ configurations.Because of the enhanced transition strengths, we offer the isoscalar monopole and dipole transitions as good probe for the ${}^{24}$Mg+$\alpha$ and ${}^{20}$Ne+2$\alpha$ cluster bands.

   ↳ nucl-thnucl-exPRC(2017)·24 citations
6. 06*

   $K^{-}N$ amplitudes below threshold constrained by multinucleon absorption

   E. Friedman🇮🇱 · A. Gal🇮🇱

   Six widely different subthreshold $K^{-}N$ scattering amplitudes obtained in SU(3) chiral-model EFT approaches by fitting to low-energy and threshold data are employed in optical-potential studies of kaonic atoms. Phenomenological terms representing $K^{-}$ multinucleon interactions are added to the EFT inspired single-nucleon part of the $K^{-}$-nucleus optical potential in order to obtain good fits to kaonic-atom strong-interaction level shifts and widths across the periodic table. Introducing as a further constraint the fractions of single-nucleon $K^{-}$ absorption at rest from old bubble-chamber experiments, it is found that only two of the models considered here reproduce these absorption fractions. Within these two models, the interplay between single-nucleon and multinucleon $K^{-}$ interactions explains features observed previously with fully phenomenological optical potentials. Radial sensitivities of kaonic atom observables are also re-examined, and remarks are made on the role of `subthreshold kinematics' in absorption at rest calculations.

   ↳ nucl-thhep-phnucl-exNPA(2017)·57 citations
7. 07*

   Low-energy electronic recoil in xenon detectors by solar neutrinos

   Jiunn-Wei Chen🇹🇼 · Hsin-Chang Chi🇹🇼 · C.-P. Liu🇹🇼 · Chih-Pan Wu🇹🇼

   Low-energy electronic recoil caused by solar neutrinos in multi-ton xenon detectors is an important subject not only because it is a source of the irreducible background for direct searches of weakly-interacting massive particles (WIMPs), but also because it provides a viable way to measure the solar $pp$ and ${}^7\text{Be}$ neutrinos at the precision level of current standard solar model predictions. In this work we perform $\text{ab initio}$ many-body calculations for the structure, photoionization, and neutrino-ionization of xenon. It is found that the atomic binding effect yields a sizable suppression to the neutrino-electron scattering cross section at low recoil energies. Compared with the previous calculation based on the free electron picture, our calculated event rate of electronic recoil in the same detector configuration is reduced by about $25\%$. We present in this paper the electronic recoil rate spectrum in the energy window of 100 eV - 30 keV with the standard per ton per year normalization for xenon detectors, and discuss its implication for low energy solar neutrino detection (as the signal) and WIMP search (as a source of background).

   ↳ hep-exhep-phnucl-exnucl-th+1PLB(2017)·113 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.