Thu·Jul 20, 2017Thursday·July 20, 2017

1. 01*

   Investigation of production cross sections, using stacked targets at the 88" Cyclotron with focus on ${}^{\mathrm{nat}}\mathrm{Fe}(\mathrm{p},\mathrm{x}{)}^{51}\mathrm{Mn}$

   Alexander Springer

   With the investigation of the production cross section of ${}^{51}\mathrm{Mn}$ off of ${}^{\mathrm{nat}}\mathrm{Fe}$ in mind, two stacked target experiments were conducted at the Berkeley Lab 88-Inch Cyclotron. Proton beams with energies of $25$ and $55\mathrm{MeV}$ result in a total of 14 data points for various reactions. Gamma spectra of the activated foils were taken and analyzed, then cross sections calculated.

   nucl-exphysics.ins-det1 citation
2. 02*

   Open heavy-flavour production in pp and p--Pb collisions with the ALICE experiment

   Robert Vertesi (for the ALICE Collaboration)🇭🇺

   Measurements of the heavy-flavour hadron production are a powerful tool to study the nature of strong interaction and to understand the properties of nuclear matter that is created in ultra-relativistic hadron-hadron collisions. The excellent tracking and vertexing capabilities of the ALICE experiment, together with its particle identification systems, allow for an efficient identification and reconstruction of decays of hadrons that contain heavy quarks. A selection of recent measurements on open heavy-flavour production from pp collisions at $\sqrt{s}=7$ TeV and p--Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV, collected with the ALICE detector during the LHC Run-1 phase, are discussed in this paper.

   nucl-exhep-exPoS(2018)·0 citations
3. 03*

   Measurements of multiparticle correlations in $d$$+$Au collisions at 200, 62.4, 39, and 19.6 GeV and $p$$+$Au collisions at 200 GeV and implications for collective behavior

   C. Aidala · Y. Akiba · M. Alfred · V. Andrieux · K. Aoki · N. Apadula · H. Asano · C. Ayuso · B. Azmoun · V. Babintsev · A. Bagoly · N.S. Bandara and 306 other authors

   Recently, multiparticle-correlation measurements of relativistic $p/d{/}^3$He$+$Au, $p$$+$Pb, and even $p$$+$$p$ collisions have shown surprising collective signatures. Here we present beam-energy-scan measurements of 2-, 4-, and 6-particle angular correlations in $d$$+$Au collisions at $\sqrt{s_{{}_{NN}}}$=200, 62.4, 39, and 19.6 GeV. We also present measurements of 2- and 4-particle angular correlations in $p$$+$Au collisions at $\sqrt{s_{{}_{NN}}}$=200 GeV. We find the 4-particle cumulant to be real-valued for $d$$+$Au collisions at all four energies. We also find that the 4-particle cumulant in $p$$+$Au has the opposite sign as that in $d$$+$Au, indicating that the correlations are geometrical and therefore collective in origin. Further we find that the 6-particle cumulant agrees with the 4-particle cumulant in $d$$+$Au collisions at 200 GeV, which indicates that nonflow effects are subdominant and provides strong evidence of collectivity.

   nucl-exPRL(2018)·101 citations
4. 04*

   Elastic $\alpha$-${}^{12}$C scattering at low energies with the bound states of ${}^{16}$O in effective field theory

   Shung-Ichi Ando (Sunmoon U.)🇰🇷

   The elastic $\alpha$-${}^{12}$C scattering for $l=0,1,2,3$ channels at low energies is studied, including the energies of excited bound states of ${}^{16}$O, in effective field theory. We introduce a new renormalization method due to the large suppression factor produced by the Coulomb interaction when fitting the effective range parameters to the phase sift data. After fitting the parameters, we calculate asymptotic normalization constants of the $0_2^{+}$, $1_1^{-}$, $2_1^{+}$, $3_1^{-}$ states of ${}^{16}$O. We also discuss the uncertainties of the present study when the amplitudes are interpolated to the stellar energy region of the ${}^{12}$C($\alpha$,$\gamma$)${}^{16}$O reaction.

   ↳ nucl-thnucl-exPRC(2018)·33 citations
5. 05*

   Search for solar Kaluza-Klein axion by annual modulation with the XMASS-I detector

   XMASS Collaboration: N. Oka🇯🇵 · K. Abe🇯🇵 · K. Hiraide🇯🇵 · K. Ichimura🇯🇵 · Y. Kishimoto🇯🇵 · K. Kobayashi🇯🇵 · M. Kobayashi🇯🇵 · S. Moriyama🇯🇵 · M. Nakahata🇯🇵 · T. Norita🇯🇵 · H. Ogawa🇯🇵 · K. Sato🇯🇵 and 29 other authors

   In theories with the large extra dimensions beyond the standard 4-dimensional spacetime, axions could propagate in such extra dimensions, and acquire Kaluza-Klein (KK) excitations. These KK axions are produced in the Sun and could solve unexplained heating of the solar corona. While most of the solar KK axions escape from the solar system, a small fraction is gravitationally trapped in orbits around the Sun. They would decay into two photons inside a terrestrial detector. The event rate is expected to modulate annually depending on the distance from the Sun. We have searched for the annual modulation signature using $832\times 359$ kg$\cdot$days of XMASS-I data. No significant event rate modulation is found, and hence we set the first experimental constraint on the KK axion-photon coupling of $4.8\times 10^{-12}{\mathrm{GeV}}^{-1}$ at 90% confidence level for a KK axion number density of ${\bar{n}}_{\mathrm{a}}=4.07\times 10^{13}{\mathrm{m}}^{-3}$, the total number of extra dimensions $n=2$, and the number of extra dimensions $\delta =2$ that axions can propagate in.

   ↳ hep-exastro-ph.COhep-phnucl-ex+1PTEP(2017)·18 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.