Wed·May 18, 2016Wednesday·May 18, 2016

1. 01*

   Productions of J/psi mesons in p-Pb collisions at 5 TeV

   Fu-Hu Liu🇨🇳 · Hai-Ling Lao🇨🇳 · Roy A. Lacey🇺🇸

   The rapidity distributions of $J/\psi$ mesons produced in proton-lead ($p$-Pb) collisions at center-of-mass energy per nucleon pair $\sqrt{s_{NN}}=5$ TeV are studied by using a multisource thermal model and compared with the experimental data of the LHCb and ALICE Collaborations. Correspondingly, the pseudorapidity distributions are accurately obtained from the parameters extracted from the rapidity distributions. At the same time, the transverse momentum distributions in the same experiments are described by the simplest Erlang distribution which is the folding result of two exponential distributions which are contributed by the target and projectile partons respectively.

   ↳ nucl-thhep-exhep-phnucl-exIJMPE(2016)·3 citations
2. 02*

   What do we know about neutrinoless double-beta decay nuclear matrix elements?

   J. Menéndez🇯🇵

   The detection of neutrinoless double-beta decay will establish the Majorana nature of neutrinos. In addition, if the nuclear matrix elements of this process are reliably known, the experimental lifetime will provide precious information about the absolute neutrino masses and hierarchy. I review the status of nuclear structure calculations for neutrinoless double-beta decay matrix elements, and discuss some key issues to be addressed in order to meet the demand for accurate nuclear matrix elements.

   ↳ hep-phhep-exnucl-exnucl-th7 citations
3. 03*

   Shape Coexistence in 78 Ni and the new Island of Inversion

   F Nowacki (UNISTRA, IPHC)🇫🇷 · A Poves🇪🇸 · E Caurier (UNISTRA, IPHC)🇫🇷 · B Bounthong (UNISTRA, IPHC)🇫🇷

   Large Scale Shell Model calculations (SM-CI) predict that the region of deformation which comprises the heaviest Chromium and Iron isotopes at and beyond N=40 will merge with a new one at N=50 in an astonishing parallel to the N=20 and N=28 case in the Neon and Magnesium isotopes. We propose a valence space including the full pf-shell for the protons and the full sdg shell for the neutrons; which represents a comeback of the the harmonic oscillator shells in the very neutron rich regime. The onset of deformation is understood in the framework of the algebraic SU3-like structures linked to quadrupole dominance. Our calculations preserve the doubly magic nature of the ground state of 78 Ni, which, however, exhibits a well deformed prolate band at low excitation energy, providing a striking example of shape coexistence far from stability.

   ↳ nucl-thnucl-exPRL(2016)·144 citations
4. 04*

   Competition between fermions and bosons in nuclear matter at low densities and finite temperatures

   J. Mabiala🇿🇦 · H. Zheng🇮🇹 · A. Bonasera🇺🇸 · Z. Kohley · S.J. Yennello🇺🇸

   We derive the free energy for fermions and bosons from fragmentation data. Inspired by the symmetry and pairing energy of the Weizsacker mass formula we obtain the free energy of fermions (nucleons) and bosons (alphas and deuterons) using Landau's free energy approach. We confirm previously obtained results for fermions and show that the free energy for alpha particles is negative and very close to the free energy for ideal Bose gases. Deuterons behave more similarly to fermions (positive free energy) rather than bosons. This is due to their low binding energy, which makes them very 'fragile', i.e., easily formed and destroyed. We show that the {\alpha}-particle fraction is dominant at all temperatures and densities explored in this work. This is consistent with their negative free energy, which favors clusterization of nuclear matter into {\alpha}-particles at subsaturation densities and finite temperatures. The role of finite open systems and Coulomb repulsion is addressed.

   ↳ nucl-thnucl-exPRC(2016)·8 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.