Tue·Aug 27, 2019Tuesday·August 27, 2019

1. 01*

   Effect of the transfer reactions for 16O+10B elastic scattering

   N. Burtebayev · Sh. Hamada · Awad A. Ibraheem · K. Rusek · M. Wolinska-Cichocka · J. Burtebayeva · N. Amangeldi · Maulen Nassurlla · Marzhan Nassurlla · A. Sabidolda

   In this study, the angular distribution of the 16O+10B elastic scattering was measured at Elab (16O)= 24 MeV. In addition to our experimental data, this nuclear system was theoretically analyzed at different energies to study the dynamics of scattering for this system. The data were analyzed within the framework of the double-folding optical potential model.

   nucl-exnucl-thActa Physica Polonica B, No 8, Vol. 50 (2…·4 citations
2. 02*

   Structure of 13Be probed via quasi-free scattering

   A. Corsi🇫🇷 · Y. Kubota🇯🇵 · J. Casal🇮🇹 · M. Gomez-Ramos🇪🇸 · A. M. Moro🇪🇸 · G. Authelet🇫🇷 · H. Baba🇯🇵 · C. Caesar🇩🇪 · D. Calvet🇫🇷 · A. Delbart🇫🇷 · M. Dozono🇯🇵 · J. Feng🇨🇳 and 56 other authors

   We present an investigation of the structure of 13Be obtained via a kinematically complete measurement of the (p; pn) reaction in inverse kinematics at 265 MeV/nucleon. The relative energy spectrum of 13Be is compared to Transfer-to-the-Continuum calculations which use as structure inputs the overlaps of the 14Be ground-state wave function, computed in a three-body model, with the unbound states of the 13Be residual nucleus. The key role of neutron p-wave orbital in the interpretation of the low-relative-energy part of the spectrum is discussed.

   nucl-exnucl-thPLB(2019)·29 citations
3. 03*

   The beta-Oslo method: experimentally constrained ($n,\gamma$) reaction rates relevant to the $r$-process

   A. C. Larsen🇳🇴 · S. N. Liddick🇺🇸 · A. Spyrou🇺🇸 · M. Guttormsen🇳🇴 · F. L. Bello Garrote🇳🇴 · J. E. Midtbø🇳🇴 · T. Renstrøm🇳🇴

   Unknown neutron-capture reaction rates remain a significant source of uncertainty in state-of-the-art $r$-process nucleosynthesis reaction network calculations. As the $r$-process involves highly neutron-rich nuclei for which direct ($n,\gamma$) cross-section measurements are virtually impossible, indirect methods are called for to constrain ($n,\gamma$) cross sections used as input for the $r$-process nuclear network. Here we discuss the newly developed beta-Oslo method, which is capable of providing experimental input for calculating ($n,\gamma$) rates of neutron-rich nuclei. The beta-Oslo method represents a first step towards constraining neutron-capture rates of importance to the $r$-process.

   nucl-exastro-ph.HESpringer Proc.Phys.(2019)·0 citations
4. 04*

   Searches for Exotic Hadrons at GlueX

   Sean Dobbs (for the GlueX Collaboration)🇺🇸

   The search for hybrid mesons and the detailed study of their spectrum is the primary goal of the GlueX Experiment in Hall D at Jefferson Lab. The identification and study of hybrid mesons promises to provide unique insight into gluonic degrees of freedom in QCD and the nature of confinement. The experiment combines an intense photon beam with linear polarization peaking around 9 GeV incident on a liquid hydrogen target with a nearly hermetic spectrometer, allowing for the comprehensive study of charged and neutral particle final states. The first phase of the experiment has recently concluded, yielding a photoproduction data set of unprecedented size and quality. We report on the status of the analysis of this data, including measurements of polarization observables, progress in spectroscopic measurements of light mesons, and the measurement of the photoproduction of $J/\psi$ near threshold, which is providing critical insight into the nature of the LHCb closed-charm pentaquark candidates.

   nucl-exhep-exAIP Conf.Proc.(2020)·7 citations
5. 05*

   High-$K$ multi-particle bands and pairing reduction in ${}^{254}$No

   Xiao-Tao He🇨🇳 · Shu-Yong Zhao🇨🇳 · Zhen-Hua Zhang · Zhong-Zhou Ren🇨🇳

   The multi-particle states and rotational properties of two-particle bands in ${}^{254}$No are investigated by the cranked shell model (CSM) with pairing correlations treated by a particle-number conserving (PNC) method. For the first time, the rotational bands on top of two-particle $K^{\pi }=3^{+},8^{-}$ and $10^{+}$ states and the pairing reduction are studied theoretically in ${}^{254}$No. The experimental excitation energies and moments of inertia for the multi-particle state are reproduced well by the calculation. Better agreement with the data are achieved by including the high-order deformation ${\epsilon }_6$ which leads to enlarged $Z=100$ and $N=152$ deformed shell gaps. The rise of the $J^{(1)}$ in these two-particle bands compared with the ground-state band is attributed to the pairing reduction due to the Pauli blocking effects.

   ↳ nucl-thnucl-exCPC(2020)·14 citations
6. 06*

   Thermodynamics of hot strong-interaction matter from ultrarelativistic nuclear collisions

   Fernando G. Gardim🇧🇷 · Giuliano Giacalone🇫🇷 · Matthew Luzum🇧🇷 · Jean-Yves Ollitrault🇫🇷

   Collisions between heavy atomic nuclei at ultra-relativistic energies are carried out at particle colliders to produce the quark-gluon plasma, a state of matter where quarks and gluons are not confined into hadrons, and colour degrees of freedom are liberated. This state is thought to be produced as a transient phenomenon before it fragments into thousands of particles that reach the particle detectors. Despite two decades of investigations, one of the big open questions is to obtain an experimental determination of the temperature reached in a heavy-ion collision, and a simultaneous determination of another thermodynamic quantity, such as the entropy density, that would give access to the number of degrees of freedom. Here we obtain the first such determination, utilizing state-of-the-art hydrodynamic simulations. We define an effective temperature, averaged over the space-time evolution of the medium. Then, using experimental data, we determine this temperature, the corresponding entropy density and speed of sound in the matter created in lead-lead collisions at the Large Hadron Collider. Our results agree with first-principles calculations from lattice quantum chromodynamics and confirm that a deconfined phase of matter is indeed produced.

   ↳ nucl-thhep-phnucl-exNat.Phys.(2020)·138 citations
7. 07*

   Coherent elastic neutrino-nucleus scattering on 40Ar from first principles

   C. G. Payne🇩🇪 · S. Bacca🇩🇪 · G. Hagen🇺🇸 · W. Jiang🇺🇸 · T. Papenbrock🇺🇸

   Coherent elastic neutrino scattering on the 40Ar nucleus is computed with coupled-cluster theory based on nuclear Hamiltonians inspired by effective field theories of quantum chromodynamics. Our approach is validated by calculating the charge form factor and comparing it to data from electron scattering. We make predictions for the weak form factor, the neutron radius, and the neutron skin, and estimate systematic uncertainties. The neutron-skin thickness of 40Ar40 is consistent with results from density functional theory. Precision measurements from coherent elastic neutrino-nucleus scattering could potentially be used to extract these observables and help to constrain nuclear models.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2019)·76 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.