54 research outputs found
Evidence for octupole collectivity in Pt-172
Excited states in the extremely neutron-deficient nucleus Pt-172 were populated via Ru-96(Kr-78, 2p) and Mo-92(Kr-83, 3n) reactions. The level scheme has been extended up to an excitation energy of approximate to 5MeV and tentative spin-parity assignments up to I-pi = 18(+). Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negativeparity band. The lowestmember of this negative-parity structure was firmly assigned spin-parity 3(-). In addition, we observed an E3 transition from this 3(-) state to the ground state, providing direct evidence for octupole collectivity in Pt-172. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the 3(-) state as a collective octupole-vibrational state.Peer reviewe
Marketing (as) Rhetoric: paradigms, provocations, and perspectives
In this collection of short, invited essays on the topic of marketing (as) rhetoric we deal with a variety of issues that demonstrate the centrality of rhetoric and rhetorical considerations to the pursuit of marketing scholarship, research and practice. Stephen Brown examines the enduring rhetorical power of the 4Ps; Chris Hackley argues for the critical power of rhetorical orientations in marketing scholarship but cautions us on the need to work harder in conceptually connecting rhetorical theory and modern marketing frameworks; Shelby Hunt explains how rhetorical processes are incorporated in his inductive realist model of theory generation, using one of his most successful publications as an illustration; Charles Marsh demonstrates what Isocratesâ broad rhetorical project has to teach us about the importance of reputation cultivation in modern marketing; Nicholas OâShaughnessy uses an analysis of Trumpâs discourse to argue that political marketing as it is currently conceived is ill-equipped to engage effectively with the rhetorical force of Trumpâs âunmarketingâ; Barbara Phillips uses Vygotskyâs work on imagination to investigate the important of pleasure and play in advertising rhetoric; and finally, David Tonks, who in many ways started it all, reiterates the need for marketers to recognise the strength of the relationship between marketing and persuasion
Molecular Characterization of Podoviral Bacteriophages Virulent for Clostridium perfringens and Their Comparison with Members of the Picovirinae
Clostridium perfringens is a Gram-positive, spore-forming anaerobic bacterium responsible for human food-borne disease as well as non-food-borne human, animal and poultry diseases. Because bacteriophages or their gene products could be applied to control bacterial diseases in a species-specific manner, they are potential important alternatives to antibiotics. Consequently, poultry intestinal material, soil, sewage and poultry processing drainage water were screened for virulent bacteriophages that lysed C. perfringens. Two bacteriophages, designated ΊCPV4 and ΊZP2, were isolated in the Moscow Region of the Russian Federation while another closely related virus, named ΊCP7R, was isolated in the southeastern USA. The viruses were identified as members of the order Caudovirales in the family Podoviridae with short, non-contractile tails of the C1 morphotype. The genomes of the three bacteriophages were 17.972, 18.078 and 18.397 kbp respectively; encoding twenty-six to twenty-eight ORF's with inverted terminal repeats and an average GC content of 34.6%. Structural proteins identified by mass spectrometry in the purified ΊCP7R virion included a pre-neck/appendage with putative lyase activity, major head, tail, connector/upper collar, lower collar and a structural protein with putative lysozyme-peptidase activity. All three podoviral bacteriophage genomes encoded a predicted N-acetylmuramoyl-L-alanine amidase and a putative stage V sporulation protein. Each putative amidase contained a predicted bacterial SH3 domain at the C-terminal end of the protein, presumably involved with binding the C. perfringens cell wall. The predicted DNA polymerase type B protein sequences were closely related to other members of the Podoviridae including Bacillus phage Ί29. Whole-genome comparisons supported this relationship, but also indicated that the Russian and USA viruses may be unique members of the sub-family Picovirinae
Spectroscopy of low-spin states in 157Dy : Search for evidence of enhanced octupole correlations
CITATION: Majola, S. N. T., et al. 2019. Spectroscopy of low-spin states in 157Dy : Search for evidence of enhanced octupole correlations. Physical Review C, 100(6):034322, doi:10.1103/PhysRevC.100.034322.The original publication is available at https://journals.aps.org/prcLow-spin states of Âčâ”â·Dy have been studied using the JUROGAM II array, following the Âčâ”â”Gd (α, 2n) reaction at a beam energy of 25 MeV. The level scheme of Âčâ”â·Dy has been expanded with four new bands. Rotational structures built on the [523]5/2â» and [402]3/2âș neutron orbitals constitute new additions to the level scheme as do many of the inter- and intraband transitions. This manuscript also reports the observation of cross Iâș â(Iâ1) â» and Iâ» â(Iâ1)âș E1 dipole transitions interlinking structures built on the [523]5/2â» (band 5) and [402]3/2âș (band 7) neutron orbitals. These interlacing band structures are interpreted as the bands of parity doublets with simplex quantum number s=âi related to possible octupole correlations.https://journals.aps.org/prc/abstract/10.1103/PhysRevC.100.034322Publisher's versio
Standard Methodology for Evaluating Membrane Performance in Osmotically Driven Membrane Processes
New collective structures in and their implications for the triaxial deformation of the core
The extremely neutron-deficient isotope Au179 has been studied by a combination of in-beam Îł-ray and isomeric-decay spectroscopy. For in-beam spectroscopy, the recoil-isomer tagging technique was employed, using the known 3/2-, T1/2=328 ns isomer. A new rotational band, associated with the unfavored signature band of the 1h9/2?2f7/2 proton-intruder configuration, was revealed. A previously unknown, high-spin isomeric state with an excitation energy of 1743(17) keV and T1/2=2.16(8)ÎŒs was discovered. Five decay paths were identified, some of them feeding previously unknown non-yrast excited states, associated with the 1i13/2 proton-intruder configuration. Calculations based on the particle-plus-triaxial-rotor model were performed to interpret the data. On the basis of these calculations, the new 1h9/2?2f7/2 rotational band is interpreted as due to triaxial deformation of the underlying configuration with ÎČ2â0.26 and Îłâ27?. Observed non-yrast states of the positive-parity 1i13/2 intruder configuration are interpreted as due to triaxial deformation with ÎČ2â0.26 and Îłâ20?
Boris Artzybasheff and the art of anthropomorphic marketing in early American consumer culture
First candidates for Îł vibrational bands built on the [505] 11/2â neutron orbital in odd-A Dy isotopes:
Rotational structures have been measured using the Jurogam II and GAMMASPHERE arrays at low spin following the 155Gd(α,2n)157Dy and 148Nd(12C,5n)155Dy reactions at 25 and 65 MeV, respectively. We report high-K bands, which are conjectured to be the first candidates of a KÏ=2+Îł vibrational band, built on the [505]11/2â neutron orbital, in both odd-A155,157Dy isotopes. The coupling of the first excited K=0+ states or the so-called ÎČ vibrational bands at 661 and 676 keV in 154Dy and 156Dy to the [505]11/2â orbital, to produce a KÏ=11/2â band, was not observed in both 155Dy and 157Dy, respectively. The implication of these findings on the interpretation of the first excited 0+ states in the core nuclei 154Dy and 156Dy are also discussed
ÎČ and Îł bands in N = 88 , 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory : vibrations, shape coexistence, and superdeformation
CITATION: Majola, S. N. T. et al. 2019. ÎČ and Îł bands in N=88, 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory: Vibrations, shape coexistence, and superdeformation. Physical Review C, 100(4). doi:10.1103/PhysRevC.100.044324.The original publication is available at https://journals.aps.org/prc/A comprehensive systematic study is made for the collective ÎČ and Îł bands in even-even isotopes with neutron numbers N = 88 to 92 and proton numbers Z = 62 (Sm) to 70 (Yb). Data, including excitation energies,
B(E0) and B(E2) values, and branching ratios from previously published experiments are collated with new
data presented for the first time in this study. The experimental data are compared to calculations using a
five-dimensional collective Hamiltonian (5DCH) based on the covariant density functional theory (CDFT). A
realistic potential in the quadrupole shape parameters V (ÎČ,Îł ) is determined from potential energy surfaces
(PES) calculated using the CDFT. The parameters of the 5DCH are fixed and contained within the CDFT.
Overall, a satisfactory agreement is found between the data and the calculations. In line with the energy
staggering S(I) of the levels in the 2Îł
+ bands, the potential energy surfaces of the CDFT calculations indicate
Îł -soft shapes in the N = 88 nuclides, which become Îł rigid for N = 90 and N = 92. The nature of the 02
+
bands changes with atomic number. In the isotopes of Sm to Dy, they can be understood as ÎČ vibrations, but in
the Er and Yb isotopes the 02
+ bands have wave functions with large components in a triaxial superdeformed
minimum. In the vicinity of 152Sm, the present calculations predict a soft potential in the ÎČ direction but do not
find two coexisting minima. This is reminiscent of 152Sm exhibiting an X(5) behavior. The model also predicts
that the 03
+ bands are of two-phonon nature, having an energy twice that of the 02
+ band. This is in contradiction
with the data and implies that other excitation modes must be invoked to explain their origin.https://journals.aps.org/prc/abstract/10.1103/PhysRevC.100.044324Publisherâs versio
- âŠ