Mon·Nov 10, 2014Monday·November 10, 2014

1. 01*

   Proton-induced cross-sections of nuclear reactions on lead up to 37 MeV

   F. Ditrói🇭🇺 · F. Tárkányi🇭🇺 · S. Takács🇭🇺 · A. Hermanne🇧🇪

   Excitation function of proton induced nuclear reactions on lead for production of ${}^{206,205,204,203,202,201g}$Bi, ${}^{203cum,202m,201cum}$Pb and ${}^{202cum,201cum,200cum,199cum}$Tl radionuclides were measured up to 36 MeV by using activation method, stacked foil irradiation technique and $\gamma$-ray spectrometry. The new experimental data were compared with the few earlier experimental results and with the predictions of the EMPIRE3.1, ALICE-IPPE (MENDL2p) and TALYS (TENDL-2012) theoretical reaction codes.

   nucl-exAppl.Radiat.Isot.(2014)·4 citations
2. 02*

   Effect of initial fluctuations on the collective flow in intermediate-energy heavy ion collisions

   Jia Wang🇨🇳 · Yu-Gang Ma🇨🇳 · Guo-Qiang Zhang🇨🇳 · Wen-Qing Shen🇨🇳

   A systemical analysis of the initial fluctuation effect on the collective flows for Au+Au at 1$A$ GeV has been presented in the framework of Isospin-dependent Quantum Molecular Dynamics model (IQMD), and a special focus on the initial fluctuation effect on the squeeze-out is emphasized. The flows calculated by the participant plane reconstructedby the initial geometry in coordinate space are compared with those calculated by both the ideal reaction plane and event plane methods. It is found that initial fluctuation weakens squeeze-out effect, and somediscrepancies between the flows extracted by the above different plane methods appearwhich indicate that the flows are affected by the evolution of dynamics. In addition, we found that the squeeze-out flow is also proportional to initial eccentricity. Our calculations also qualitatively give the similar trend for the excitation function of the elliptic flow of the FOPI experimental data. Finally we address the nucleon number scaling of the flows for light particles. Even though initial fluctuation decreases the ratio of $v_4/v_2^2$ as well as $v_3/(v_1{v}_2$) a lot, all fragments to mass number 4 keep the same curve and shows independent of transverse momentum.

   ↳ nucl-thnucl-exPRC(2014)·16 citations
3. 03*

   Deformation effects on the coexistence between neutron-proton and particle like pairing in N=Z medium mass nuclei

   D. Gambacurta🇫🇷 · D. Lacroix🇫🇷

   A model combining self-consistent mean-field and shell-model techniques is used to study the competition between particle like and proton-neutron pairing correlations in fp-shell even-even self-conjugate nuclei. Results obtained using constant two-body pairing interactions as well as more sophisticated interactions are presented and discussed. The standard BCS calculations are systematically compared with more refined approaches including correlation effects beyond the independent quasi-particle approach. The competition between proton-neutron correlations in the isoscalar and isovector channels is also analyzed, as well as their dependence on the deformation properties. Besides the expected role of the spin-orbit interaction and particle number conservation, it is shown that deformation leads to a reduction of the pairing correlations. This reduction originates from the change of the single-particle spectrum and from a quenching of the residual pairing matrix elements. The competition between isoscalar and isovector pairing in the deuteron transfer is finally addressed. Although a strong dependence the isovector pairing correlations with respect to nuclear deformation is observed, they always dominate over the isoscalar ones.

   ↳ nucl-thnucl-exPRC(2015)·22 citations
4. 04*

   Intriguing Trends in Nuclear Physics Articles Authorship

   B. Pritychenko🇺🇸

   The increase in authorship of nuclear physics publications has been investigated using the large statistical samples. This has been accomplished with nuclear data mining of nuclear science references (NSR) and experimental nuclear reaction (EXFOR) databases. The results of this study will be discussed and conclusions will be given.

   ↳ cs.DLnucl-exphysics.soc-phScientometrics(2015)·2 citations
5. 05*

   Light (Hyper-)Nuclei production at the LHC measured with ALICE

   Francesco Barile (for the ALICE Collaboration)🇮🇹

   The high center-of-mass energies delivered by the LHC during the last three years of operation led to accumulate a significant statistics of light (hyper-)nuclei in pp, p--Pb and Pb--Pb collisions. The ALICE apparatus allows for the detection of these rarely produced particles over a wide momentum range thanks to its excellent vertexing, tracking and particle identification capabilities. The last is based on the specific energy loss in the Time Projection Chamber and the velocity measurement with the Time-Of-Flight detector. The Cherenkov technique, exploited by a small acceptance detector (HMPID), has also been used for the most central Pb--Pb collisions to identify (anti-)deuterons at intermediate transverse momentum.\\ Results on the production of stable nuclei and anti-nuclei in pp, p--Pb and Pb--Pb collisions are presented. Hypernuclei production rates in Pb--Pb are also described, together with a measurement of the hypertriton lifetime. The results are compared with the predictions from thermal and coalescence models. Moreover the results on the search for weakly-decaying light exotic states, such as the $\Lambda \Lambda$ (H-dibaryon) and the $\Lambda$-neutron bound states are discussed.

   ↳ hep-exnucl-exEPJ Web Conf.(2015)·4 citations
6. 06*

   Large Magnetic Shielding Factor Measured by Nonlinear Magneto-optical Rotation

   Jeffery W. Martin🇨🇦 · Russell R. Mammei🇺🇸 · Wolfgang Klassen · Cameron Cerasani · Taraneh Andalib · Christopher P. Bidinosti · Michael Lang🇩🇪 · David Ostapchuk

   A passive magnetic shield was designed and constructed for magnetometer tests for the future neutron electric dipole moment experiment at TRIUMF. The axial shielding factor of the magnetic shield was measured using a magnetometer based on non-linear magneto-optical rotation of the plane of polarized laser light upon passage through a paraffin-coated vapour cell containing natural Rb at room temperature. The laser was tuned to the Rb D1 line, near the ${}^{85}$Rb $F=2\to 2,3$ transition. The shielding factor was measured by applying an axial field externally and measuring the magnetic field internally using the magnetometer. The axial shielding factor was determined to be $(1.3\pm 0.1)\times 10^7$, from an applied axial field of 1.45~$\mu$T in the background of Earth's magnetic field.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2015)·4 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.