Mon·Nov 9, 2015Monday·November 9, 2015

1. 01*

   Statistical properties of ${}^{243}$Pu, and ${}^{242}$Pu(n,$\gamma$) cross section calculation

   T.A. Laplace🇺🇸 · F. Zeiser🇳🇴 · M. Guttormsen🇳🇴 · A.C. Larsen🇳🇴 · D.L. Bleuel🇺🇸 · L.A. Bernstein🇺🇸 · B.L. Goldblum · S. Siem🇳🇴 · F.L. Bello Garotte · J.A. Brown🇺🇸 · L. Crespo Campo🇳🇴 · T.K. Eriksen🇳🇴 and 15 other authors

   The level density and gamma-ray strength function (gammaSF) of 243Pu have been measured in the quasi-continuum using the Oslo method. Excited states in 243Pu were populated using the 242Pu(d,p) reaction. The level density closely follows the constant-temperature level density formula for excitation energies above the pairing gap. The gammaSF displays a double-humped resonance at low energy as also seen in previous investigations of actinide isotopes. The structure is interpreted as the scissors resonance and has a centroid of omega_{SR}=2.42(5)MeV and a total strength of B_{SR}=10.1(15)mu_N^2, which is in excellent agreement with sum-rule estimates. The measured level density and gammaSF were used to calculate the 242Pu(n,gamma) cross section in a neutron energy range for which there were previously no measured data.

   nucl-exPRC(2016)·36 citations
2. 02*

   Heavy-ion collisions at the Large Hadron Collider: a review of the results from Run 1

   N. Armesto🇪🇸 · E. Scomparin🇮🇹

   We present an overview of the results obtained in pPb and PbPb collisions at the Large Hadron Collider during Run 1. We first discuss the results for global characteristics: cross sections, hadron multiplicities, azimuthal asymmetries, correlations at low transverse momentum, hadrochemistry, and femtoscopy. We then review hard and electromagnetic probes: particles with high transverse momentum, jets, heavy quarks, quarkonium, electroweak bosons and high transverse momentum photons, low transverse momentum photons and dileptons, and ultraperipheral collisions. We mainly focus on the experimental results, and present very briefly the main current theoretical explanations.

   nucl-exhep-exhep-phnucl-thEur.Phys.J.Plus(2016)·97 citations
3. 03*

   Observation of time-invariant coherence in a room temperature quantum simulator

   Isabela A. Silva🇧🇷 · Alexandre M. Souza🇧🇷 · Thomas R. Bromley · Marco Cianciaruso · Raimund Marx · Roberto S. Sarthour🇮🇹 · Ivan S. Oliveira🇮🇹 · Rosario Lo Franco · Steffen J. Glaser · Eduardo R. deAzevedo🇧🇷 · Diogo O. Soares-Pinto🇧🇷 · Gerardo Adesso🇬🇧

   The ability to live in coherent superpositions is a signature trait of quantum systems and constitutes an irreplaceable resource for quantum-enhanced technologies. However, decoherence effects usually destroy quantum superpositions. It has been recently predicted that, in a composite quantum system exposed to dephasing noise, quantum coherence in a transversal reference basis can stay protected for indefinite time. This can occur for a class of quantum states independently of the measure used to quantify coherence, and requires no control on the system during the dynamics. Here, such an invariant coherence phenomenon is observed experimentally in two different setups based on nuclear magnetic resonance at room temperature, realising an effective quantum simulator of two- and four-qubit spin systems. Our study further reveals a novel interplay between coherence and various forms of correlations, and highlights the natural resilience of quantum effects in complex systems.

   ↳ quant-phcond-mat.mes-hallnucl-exphysics.data-anPRL(2016)·79 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.