Thu·Nov 6, 2014Thursday·November 6, 2014

1. 01*

   Averaged number of prompt neutrons calculus for photo-fission of actinides

   A.I. Lengyel🇺🇦 · O.O. Parlag · V.T. Maslyuk🇺🇦 · N.I. Romanyuk · O.O. Gritzay

   The empirical calculations of the prompt neutrons average number for photofission of the 232Th, 233U, 234U, 235U, 236U, 238U, 237Np, 239Pu and 241Am actinides has been done as a function of photon energy, mass and charge of the nuclei, which can be used to evaluate the average number for photo-fission of nuclides for which no or scarce data are available.

   nucl-exnucl-th0 citations
2. 02*

   Examination of level density prescriptions in the interpretation of high energy gamma-ray spectra

   Srijit Bhattacharya🇮🇳 · Deepak Pandit🇮🇳 · Balaram Dey🇮🇳 · Debasish Mondal🇮🇳 · S. Mukhopadhyay🇮🇳 · Surajit Pal🇮🇳 · A. De🇮🇳 · S. R. Banerjee🇮🇳

   High energy $\gamma$-ray spectra measured by our group involving the compound nuclei (CN) ${}^{63}$Cu at excitation energy ($E^{\ast }$) $\sim$ 36 MeV with average angular momentum ($J$) = 12 - 17 $\hslash$, ${}^{97}$Tc at $E^{\ast }\sim$ 29 - 50 MeV with $J$ = 12 - 14 $\hslash$, ${}^{113}$Sb at $E^{\ast }$ = 109 MeV and 121 MeV with $J$ = 49 - 59 $\hslash$ and ${}^{201}$Tl at $E^{\ast }$ = 39.5, 47.5 MeV with $J$ = 18 - 24 $\hslash$ have been analyzed utilizing the level density prescriptions of (i)Ignatyuk, Smirenkin and Tishin (IST), (ii)Budtz-Jorgensen and Knitter (BJK), and (iii) Kataria, Ramamurthy and Kapoor (KRK). These three prescriptions have been tested for correct statistical model description of high energy $\gamma$-rays in the light of extracting the giant dipole resonance (GDR) parameters at low excitation energy and spin where shell effects might play an important role as well as at high excitation energy where shell effects have melted. Interestingly, only the IST level density prescription could explain the high energy $\gamma$-ray spectra with reasonable GDR parameters for all the four nuclei.

   nucl-exnucl-thPRC(2014)·7 citations
3. 03*

   Results of the material screening program of the NEXT experiment

   T. Dafni🇪🇸 · V. Alvarez🇪🇸 · I. Bandac🇪🇸 · A. Bettini🇮🇹 · F.I.G.M. Borges🇵🇹 · M. Camargo🇨🇴 · S. Carcel🇪🇸 · S. Cebrian🇪🇸 · A. Cervera🇪🇸 · C.A.N. Conde🇵🇹 · J. Diaz🇪🇸 · R. Esteve🇪🇸 and 58 other authors

   The 'Neutrino Experiment with a Xenon TPC (NEXT)', intended to investigate neutrinoless double beta decay, requires extremely low background levels. An extensive material screening and selection process to assess the radioactivity of components is underway combining several techniques, including germanium gamma-ray spectrometry performed at the Canfranc Underground Laboratory; recent results of this material screening program are presented here.

   ↳ physics.ins-dethep-exnucl-exNucl.Part.Phys.Proc.(2016)·9 citations
4. 04*

   Non-observable nature of the nuclear shell structure. Meaning, illustrations and consequences

   T. Duguet🇫🇷 · H. Hergert🇺🇸 · J. D. Holt🇩🇪 · V. Somà🇫🇷

   The concept of single-nucleon shells constitutes a basic pillar of our understanding of nuclear structure. Effective single-particle energies (ESPEs) introduced by French and Baranger represent the most appropriate tool to relate many-body observables to a single-nucleon shell structure. As briefly discussed in [T. Duguet, G. Hagen, Phys. Rev. C {\bf 85}, 034330 (2012)], the dependence of ESPEs on one-nucleon transfer probability matrices makes them purely theoretical quantities that "run" with the non-observable resolution scale $\lambda$ employed in the calculation. Given that ESPEs provide a way to interpret the many-body problem in terms of simpler theoretical ingredients, the goal is to specify the terms, i.e. the exact sense and conditions, in which this interpretation can be conducted meaningfully. State-of-the-art multi-reference in-medium similarity renormalization group and self-consistent Gorkov Green's function many-body calculations are employed to corroborate the formal analysis. This is done by comparing the behavior of several observables and of non-observable ESPEs (and spectroscopic factors) under (quasi) unitary similarity renormalization group transformations of the Hamiltonian parameterized by the resolution scale $\lambda$. The non-observable nature of the nuclear shell structure, i.e. the fact that it constitutes an intrinsically theoretical object with no counterpart in the empirical world, must be recognized and assimilated. Eventually, practitioners can refer to nuclear shells and spectroscopic factors in their analyses of nuclear phenomena if, and only if, they use consistent structure and reaction theoretical schemes based on a fixed resolution scale they have agreed on prior to performing their analysis and comparisons.

   ↳ nucl-thnucl-exPRC(2015)·79 citations
5. 05*

   In-medium antikaon interactions and bound states

   Avraham Gal🇮🇱 · Eli Friedman🇮🇱 · Nir Barnea🇮🇱 · Aleš Cieplý🇨🇿 · Jiří Mareš🇨🇿 · Daniel Gazda🇮🇹

   Correct treatment of subthreshold Kbar-N dynamics is mandatory in kaonic-atom and Kbar-nuclear bound-state calculations, as demonstrated by using in-medium chirally-based models of Kbar-N interactions. Recent studies of kaonic-atom data reveal appreciable multi-nucleon contributions. Kbar-nuclear widths larger than 50 MeV are anticipated.

   ↳ nucl-thnucl-exEPJ Web Conf.(2014)·6 citations
6. 06*

   Central exclusive production in the ALICE experiment at the LHC

   R. Schicker🇩🇪

   The ALICE experiment at the Large Hadron Collider (LHC) at CERN consists of a central barrel, a muon spectrometer and additional detectors for trigger and event classification purposes. The low transverse momentum threshold of the central barrel gives ALICE a unique opportunity to study the low mass sector of central exclusive production at the LHC.

   ↳ hep-exnucl-exInt.J.Mod.Phys.A(2014)·11 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.