Thu·Sep 20, 2018Thursday·September 20, 2018

1. 01*

   Activation cross sections of \alpha-induced reactions on ${}^{nat}$Zn for Ge and Ga production

   Masayuki Aikawa🇯🇵 · Moemi Saito · Shuichiro Ebata · Yukiko Komori · Hiromitsu Haba🇯🇵

   The production cross sections of ${}^{68,69}$Ge and ${}^{66,67}$Ga by \alpha-induced reactions on ${}^{nat}$Zn have been measured using the stacked-foil activation method and off-line \gamma-ray spectrometry from their threshold energies to 50.7 MeV. The derived cross sections were compared with the previous experimental data and the calculated values in the TENLD-2017 library. Our result shows a slightly larger amplitude than the previous data at the peak, though the peak energy is consistent with them.

   nucl-exNucl.Instrum.Meth.B(2018)·3 citations
2. 02*

   Extremely asymmetric shears band in 143Sm

   S. Rajbanshi🇮🇳 · R. Raut🇮🇳 · H. Pai🇮🇳 · Sajad Ali🇮🇳 · A. Goswami🇮🇳 · S. Bhattacharyya🇮🇳 · G. Mukherjee🇮🇳 · R. K. Bhowmik🇮🇳 · S. Muralithar🇮🇳 · R. P. Singh🇮🇳 · G. Gangopadhyay🇮🇳 · M. Kumar Raju🇯🇵 · P. Singh🇫🇷

   A dipole sequence has been observed and investigated in the 143 Sm nucleus populated through the heavy-ion induced fusion-evaporation reaction and studied using the Indian National Gamma Array (INGA) as the detection system. The sequence has been established as a Magnetic Rotation (MR) band primarily from lifetime measurements of the band members using the Doppler Shift Attenuation Method (DSAM). A configuration based on nine quasiparticles, with highly asymmetric angular momentum blades, has been assigned to the shears band in the light of the theoretical calculations within the framework of Shears mechanism with the Principal Axis Cranking (SPAC) model. This is hitherto the maximum number of quasiparticles along with the highest asymmetricity associated with a MR band. Further, as it has followed from the SPAC calculations, the contribution of the core rotation to the angular momentum of this shears band is substantial and greater than in any other similar sequence, at least in the neighbouring nuclei. This band can thus be perceived as a unique phenomenon of shears mechanism in operation at the limits of quasiparticle excitations, as manifested in MR band-like phenomena, evolving into collectivity.

   nucl-exPRC(2018)·9 citations
3. 03*

   K${}^{-}$ multi-nucleon absorption cross sections and branching ratios in $\Lambda$p and ${\Sigma }^0$p final states

   R. Del Grande🇮🇹 · K. Piscicchia🇮🇹 · O. Vazquez Doce🇩🇪 · M. Cargnelli🇦🇹 · C. Curceanu🇮🇹 · L. Fabbietti🇩🇪 · J. Marton🇦🇹 · P. Moskal🇵🇱 · A. Ramos🇪🇸 · A. Scordo🇮🇹 · D. Sirghi🇮🇹 · M. Skurzok🇵🇱 and 10 other authors

   The determination of low-energy cross sections and branching ratios of the K${}^{-}$ multi-nucleon absorption processes in $\Lambda$p and ${\Sigma }^0$p final states performed by the AMADEUS collaboration is presented. Low momentum K${}^{-}$ ($p_{\mathrm{K}}\simeq$ 127 MeV/c) produced at the DA$\Phi$NE collider are impinged on a Carbon target within the KLOE detector and the two and three nucleon absorption processes are disentangled by comparing the experimental data to phenomenological calculations. The $\Lambda$p spectra are interpreted in terms of K${}^{-}$ multi-nucleon absorption processes; the possible contribution of a K${}^{-}$pp bound state is demonstrated to overlap with the two nucleon capture process, its absolute yield thus resulting indistinguishable.

   nucl-exEPJC(2019)·38 citations
4. 04*

   Measurement of photon-jet transverse momentum correlations in 5.02 TeV Pb+Pb and $pp$ collisions with ATLAS

   ATLAS Collaboration

   Jets created in association with a photon can be used as a calibrated probe to study energy loss in the medium created in nuclear collisions. Measurements of the transverse momentum balance between isolated photons and inclusive jets are presented using integrated luminosities of 0.49 nb${}^{-1}$ of Pb+Pb collision data at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and 25 pb${}^{-1}$ of $pp$ collision data at $\sqrt{s}=5.02$ TeV recorded with the ATLAS detector at the LHC. Photons with transverse momentum $63.1<p_{\mathrm{T}}^{\gamma }<200$ GeV and $\left|{\eta }^{\gamma }\right|<2.37$ are paired inclusively with all jets in the event that have $p_{\mathrm{T}}^{\mathrm{jet}}>31.6$ GeV and pseudorapidity $\left|{\eta }^{\mathrm{jet}}\right|<2.8$. The transverse momentum balance given by the jet-to-photon $p_{\mathrm{T}}$ ratio, $x_{\mathrm{J}\gamma }$, is measured for pairs with azimuthal opening angle $\Delta \varphi >7\pi /8$. Distributions of the per-photon jet yield as a function of $x_{\mathrm{J}\gamma }$, $(1/N_{\gamma })(\mathrm{d}N/\mathrm{d}{x}_{\mathrm{J}\gamma })$, are corrected for detector effects via a two-dimensional unfolding procedure and reported at the particle level. In $pp$ collisions, the distributions are well described by Monte Carlo event generators. In Pb+Pb collisions, the $x_{\mathrm{J}\gamma }$ distribution is modified from that observed in $pp$ collisions with increasing centrality, consistent with the picture of parton energy loss in the hot nuclear medium. The data are compared with a suite of energy-loss models and calculations.

   nucl-exhep-exPLB(2019)·116 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.