Thu·Jun 26, 2014Thursday·June 26, 2014

1. 01*

   Direct mapping of nuclear shell effects in the heaviest elements

   E. Minaya Ramirez · D. Ackermann · K. Blaum🇩🇪 · M. Block🇺🇸 · C. Droese🇩🇪 · Ch. E. Düllmann🇩🇪 · M. Dworschak · M. Eibach🇩🇪 · S. Eliseev🇩🇪 · E. Haettner🇩🇪 · F. Herfurth🇩🇪 · F.P. Heßberger and 12 other authors

   Quantum-mechanical shell effects are expected to strongly enhance nuclear binding on an "island of stability" of superheavy elements. The predicted center at proton number $Z=114,120$, or $126$ and neutron number $N=184$ has been substantiated by the recent synthesis of new elements up to $Z=118$. However the location of the center and the extension of the island of stability remain vague. High-precision mass spectrometry allows the direct measurement of nuclear binding energies and thus the determination of the strength of shell effects. Here, we present such measurements for nobelium and lawrencium isotopes, which also pin down the deformed shell gap at $N=152$.

   nucl-exScience(2012)·111 citations
2. 02*

   Hadronic shift in pionic hydrogen

   M. Hennebach🇩🇪 · D. F. Anagnostopoulos🇬🇷 · A. Dax🇨🇭 · H. Fuhrmann🇦🇹 · D. Gotta🇩🇪 · A. Gruber🇦🇹 · A. Hirtl🇦🇹 · P. Indelicato🇫🇷 · Y.-W. Liu🇨🇭 · B. Manil🇫🇷 · V. E. Markushin🇨🇭 · A. J. Rusi el Hassani🇲🇦 and 3 other authors

   The hadronic shift in pionic hydrogen has been redetermined to be ${ϵ}_{1s}=7.086\pm 0.007(stat)\pm 0.006(sys)$\,eV by X-ray spectroscopy of ground state transitions applying various energy calibration schemes. The experiment was performed at the high-intensity low-energy pion beam of the Paul Scherrer Institut by using the cyclotron trap and an ultimate-resolution Bragg spectrometer with bent crystals.

   nucl-exphysics.atom-phEPJA(2014)·49 citations
3. 03*

   Decomposition of sensitivity of the symmetry energy observables

   He-Lei Liu🇨🇳 · Gao-Chan Yong🇨🇳 · De-Hua Wen🇨🇳

   To exactly answer which density region that some frequently used symmetry-energy-sensitive observables probe, for the first time, we make a study of decomposition of the sensitivity of some symmetry-energy-sensitive observables. It is found that for the Au+Au reaction at incident beam energies of 200 and 400 MeV/nucleon, frequently used symmetry-energy-sensitive observables mainly probe the density-dependent symmetry energy around 1.25${\rho }_0$ (for pionic observables) or 1.5${\rho }_0$ (for nucleonic observables). Effects of the symmetry energy in the low-density region is in general small but observable. The fact that the symmetry-energy-sensitive observables are not sensitive to the symmetry energy in the maximal baryon-density region increases the difficulty of studying nuclear symmetry energy at super-density.

   ↳ nucl-thnucl-exPRC(2015)·16 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.