9,403,134 research outputs found
High-resolution investigation of the Sb-121(p,t)Sb-119 reaction and quasiparticle-phonon model description
No full textThe Sb-121(p,t)Sb-119 reaction has been measured in a high-resolution experiment at an incident energy of 21 MeV. Accurate measurement of the (p,t) reaction angular distributions for the transitions to the levels of Sb-119 allows us to determine energies of 59 levels, 23 of which have been identified for the first time, and to assign the angular momentum transfer values and a well-defined range for the J values. DWBA analysis has been performed in a finite-range approximation, assuming a dineutron cluster pickup mechanism, by using conventional Woods-Saxon potentials for the entrance proton and exit triton channel. The present (p,t) data have been supplemented by microscopic calculations in the framework of the quasiparticle-phonon model, giving a reasonably good description of the experimental fragmentation of the integrated cross sections and the absence of (p,t) strength above 2.9 MeV
Study pf the 119Sb via the 121Sb(p,t)119Sb reaction
No full textAccurate measurement of the (p,t)
reaction angular distributions for the transitions to the levels of 119Sb
allows us to confirm or determine energies of 59 levels, 23 of which have been
identified for the first time and to assign the angular momentum transfer values
and a well-defined range for the J values. By using conventional Woods-Saxon
potentials for the entrance proton and exit triton channel, the DWBA analysis
has been performed in a finite range approximation, assuming a dineutron cluster
pickup mechanism. The present (p,t) data have been supplemented by microscopic
calculations in the framework of QPM, giving a reasonably good description
of the experimental fragmentation of the cross sections and the absence of (p,t)
strength above 2.9 MeV
The 123Sn(p,t)118Sn reaction : level structure of 118Sn and microscopic DWBA calculations
No full textThe 120Sn(p,t)118Sn reaction has been studied in a high resolution experiment at an incident energy of 21 MeV. Differential cross sections for 37 transitions to levels of 118Sn up to an excitation energy of about 3.6 MeV have been measured. Cluster and microscopic DWBA analysis and shell model calculations have been carried out
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
118Sn levels studied by the 120Sn( p, t) reaction : high-resolution measurements, shell model, and distorted-wave Born approximation calculations
No full textCross-section angular distributions of 38 (p, t ) transitions to final states of 118Sn up to an excitation energy
of 3.597 MeV have been measured in a high-resolution experiment at an incident proton energy of 21 MeV. A
distorted-wave Born approximation (DWBA) analysis of the 38 experimental differential cross sections, carried
out by using conventionalWoods-Saxon potentials, allowed us either 18 confirmations of previous spin and parity
values or new assignments of spin and parity to 14 states of 118Sn. A shell-model calculation has been performed
by using a realistic two-body effective interaction derived from the CD-Bonn nucleon-nucleon potential. The
doubly-magic nucleus 132Sn is assumed as a closed core, with 14 valence neutron holes occupying the five levels
of the 50–82 shell. Within this model space the calculations are performed by employing the seniority scheme
including states with seniority up to 4. The energy spectrum of 118Sn has been calculated and compared with
the experimental one. The theoretical two-neutron spectroscopic amplitudes are used in the microscopic DWBA
calculations of some cross-section angular distributions
Variations on the Author
No full text“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
- …
