1,721,779 research outputs found
A 45 ns 8+ isomer in the doubly odd150Eu nucleus
No full textIn the doubly odd 63 150 Eu87 nucleus a 45 ns 8+ isomer at 589 keV excitation has been identified through (p, 3n) in beam ande – measurements. The low lying negative parity levels populated in its decay show great similarity to analogous states in the lighter odd-odd Eu neighbours suggesting a spherical shape for150Eu. A spherical shape is also proposed for the isomer which is assigned as (h 11/2 vf 7 2/–3 )8+ state analogous to the 9+ isomers known in148Eu and146Eu. The spin change is attributed to the crossing of the half-filledf 7/2 neutron shell atN=86
First observation of yrast gamma-rays in the N=78 nuclei 142Gd and 141Eu
No full textExcitation function measurements with agr-particles and HI-beams clearly attribute the yrast cascade previously proposed for142Gd to the141Eu neighbouring nucleus. The so far unknown yrast transitions of142Gd have been identified. Coincidence measurements establish the high-spin level schemes of the two nuclei up to 3.2 MeV
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Shell model and octupole states in148Gd from in-beam experiments
No full textThrough (alpha, 4n) and (tau, 3n) reactions the high-spin states in the two-neutron nucleus148Gd were populated up toI pgr=21– at 7.2 MeV, including numerous states above the yrast line. The148Gd energy spectrum is interpreted in terms of the spherical shell model. Identification of the (ngrf 7/2 i 1 3/2)10– state gives the ngri 13/2 single particle energy free of octupole admixtures as 2.1(1) MeV. Eight high-spin states between 1.2 and 3.7 MeV were identified as the couplings of the two valence-particles to the146Gd octupole phonon, and three above-lying levels are assigned as double-octupole excitations including a 12+ state which decays by anE3-E3 stretched cascade. All these octupole levels can be quantitatively predicted from the one-particle x phonon spectrum of147Gd. The high-spin states above 3 MeV are four-quasiparticle excitations ofpgr +1 pgr –1 ngr 2 andpgr 2 ngr 2 type and their energies are in good accord with shell model estimates
Breakup processes in the systems Be-9+Pb-208, Bi-209 and Li-6+Pb-208 around the coulomb barrier
No full textFrom recent experimental data for the systems 9Be+208Pb,209Bi and 6Li+208Pb it results
that the complete fusion process is hindered with respect to realistic theoretical predictions
(CCFUSS). However the 9Be+208Pb,209Bi complete fusion cross sections are different from
each other contrary to expectations. The 6Li data show breakup of the projectile into two
outgoing fragments, well reproduced by CDCC approach, as well as α or deuteron capture
from the target; this is relevant for the theories on the reaction dynamics around the Coulomb
barrier
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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