Mon·Jul 11, 2016Monday·July 11, 2016

1. 01*

   Are There Nuclear Structure Effects on the Isoscalar Giant Monopole Resonance and Nuclear Incompressibility near A~90?

   Y. K. Gupta🇺🇸 · U. Garg🇺🇸 · K. B. Howard🇺🇸 · J. T. Matta🇺🇸 · M. Senyigit🇺🇸 · M. Itoh🇯🇵 · S. Ando🇯🇵 · T. Aoki🇯🇵 · A. Uchiyama🇯🇵 · S. Adachi🇯🇵 · M. Fujiwara🇯🇵 · C. Iwamoto🇯🇵 and 10 other authors

   "Background-free" spectra of inelastic $\alpha$-particle scattering have been measured at a beam energy of 385 MeV in ${}^{90,92}$Zr and ${}^{92}$Mo at extremely forward angles, including 0${}^{\circ }$. The ISGMR strength distributions for the three nuclei coincide with each other, establishing clearly that nuclear incompressibility is not influenced by nuclear shell structure near $A\sim$90 as was claimed in recent measurements.

   nucl-exPLB(2016)·35 citations
2. 02*

   Has the QCD critical point been observed at RHIC? - A Rebuttal

   Roy A. Lacey (Department of Chemistry, Stony Brook University)🇺🇸

   This note rebuts an old, but recurring claim by Antoniou, Davis and Diakonos [1] that the critical point and associated critical exponents reported in Ref. [2], is based on an erroneous treatment of scaling relations near the critical point.

   nucl-exnucl-th1 citation
3. 03*

   Anharmonicity of multi-octupole-phonon excitations in ${}^{208}$Pb: analysis with multi-reference covariant density functional theory and subbarrier fusion of ${}^{16}$O+${}^{208}$Pb

   J. M. Yao🇯🇵 · K. Hagino🇯🇵

   We discuss anharmonicity of the multi-octupole-phonon states in ${}^{208}$Pb based on a covariant density functional theory, by fully taking into account the interplay between the quadrupole and the octupole degrees of freedom. Our results indicate the existence of a large anharmonicity in the transition strengths, even though the excitation energies are similar to those in the harmonic limit. We also show that the quadrupole-shape fluctuation significantly enhances the fragmentation of the two-octupole-phonon states in ${}^{208}$Pb. Using those transition strengths as inputs to coupled channels calculations, we then discuss the fusion reaction of ${}^{16}$O+${}^{208}$Pb at energies around the Coulomb barrier. We show that the anharmonicity of the octupole vibrational excitation considerably improves previous coupled-channels calculations in the harmonic oscillator limit, significantly reducing the height of the main peak in the fusion barrier distribution.

   ↳ nucl-thnucl-exPRC(2016)·25 citations
4. 04*

   Production of light nuclei in the thermal and coalescence models

   Stanislaw Mrowczynski🇵🇱

   The thermal model properly describes the production yields of light nuclei in relativistic heavy-ion collisions even so the loosely bound sizable nuclei cannot exist in the dense and hot hadron gas at a chemical freeze-out. Within the coalescence model, light nuclei are formed at the latest stage of nuclear collisions - a kinetic freeze-out - due to final state interactions. After discussing the models, we derive simple analytic formulas and, using model parameters directly inferred from experimental data, we show that the thermal and coalescence model predictions are quantitatively close to each other. A possibility to falsify one of the two models is suggested.

   ↳ nucl-thhep-phnucl-exActa Phys.Polon.B(2017)·74 citations
5. 05*

   The impact of neutral impurity concentration on charge drift mobility in germanium

   H. Mei🇺🇸 · D.-M. Mei🇺🇸 · G.-J. Wang🇺🇸 · G. Yang🇺🇸

   We reported a new result of the neutral impurity scattering of holes that has impact on the charge drift mobility in high purity p-type germanium crystals at 77 Kelvin. The charge carrier concentration, mobility and resistivity are measured by Hall Effect system at 77 Kelvin. We investigated the contribution to the total charge drift mobility from ionized impurity scattering, lattice scattering, and neutral impurity scattering with the best theoretical models and experimental data. Several samples with measured Hall mobility from the grown crystals are used for this investigation. With the measured Hall mobility and ionized impurity concentration as well as the theoretical models, we calculated the neutral impurity concentration by the Matthiessen's rule. As a result, the distributions of the neutral impurity concentrations with respect to the radius of the crystals are obtained. Consequently, we demonstrated that neutral impurity scattering is a significant contribution to the charge drift mobility, which has dependence on the concentration of neutral impurities in a given germanium crystal.

   ↳ physics.ins-detnucl-exJINST(2016)·11 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.