Sökresultat

Absolute values of two-particle transfer cross sections along the Sn-isotopic chain are calculated. They agree with measurements within errors and without free parameters. Within this scenario, the predictions concerning the absolute value of the two-particle transfer cross sections associated with the excitation of the pairing vibrational spectrum expected around the recently discovered closed sh

The properties of a cylindrical 1" × 1" and 3" × 3" LaBr3:Ce scintillators (Brillance 380) have been investigated. The first crystal has been analyzed in terms of its self activity due to unstable contaminants emitting a and β particles eventually followed by γ-rays. Coincidence measurements between LaBr3:Ce signals and γ-rays in a HPGe detector were made. The second crystal has been irradiated wi

Within the framework of nuclear field theory (NFT), the spectrum of atomic nuclei is described in terms of collective and quasiparticle degrees of freedom, that is, of elementary modes of excitation that are directly related to experiment and of their coupling, whose strength and form factors are the basic ingredients entering in the calculations of absolute cross sections of inelastic and of one-

We discuss the solution of the Dyson equation (also known as the Nambu-Gor'kov equation) for the case of medium polarization Nuclear Field Theory (NFT) processes in nuclei, and apply it to the nucleus 120Sn. Starting from a mean field obtained with the Sly4 effective nucleon-nucleon force, (mk = 0.7), we renormalize the single-particle states and the pairing interaction through the coupling to col

We present a brief introduction to the second order DWBA reaction formalism which we have used to perform the theoretical analysis of two-nucleon transfer reactions induced both by heavy and light ions. We also show an example of such a calculation, emphasizing the connection between the structure aspects of the problem and the resulting predicted two-neutron transfer cross section. The calculatio

We solve the Nambu-Gor'kov equations in 120Sn, demonstrating that the coupling of quasiparticles with collective surface vibrations renormalizes the low-lying part of the nuclear spectrum and influences pairing correlations in a substantial way.

The six measured ASn(p,t)A-2Sn(gs) transfer absolute differential cross sections (A = 112, 116, 118, 120, 122, and 124) are calculated within the framework of DWBA taking into account successive, simultaneous and non-orthogonality contributions, and making use of BCS spectroscopic amplitudes which reproduce the overall distortion of the Fermi distribution around εF . Theory provides an overall acc

High polarizability and halo phenomena are strongly correlated, as evidenced by the qualitative changes of the nuclear spectrum which arise taking into account the dynamical coupling of the valence neutrons with the collective vibrations of the system. Direct experimental evidence of their role in the induced pairing interaction binding the halo neutrons of 11Li to the core 9Li is provided by the

The second-order distorted wave Born approximation implementation of two-particle transfer direct reactions which includes simultaneous and successive transfer, properly corrected by non-orthogonality effects, is tested with the help of controlled nuclear structure and reaction inputs against data spanning the whole mass table, and showed to constitute a quantitative probe of nuclear pairing corre

We calculate the different contributions to the pairing gap for the case of the superfluid nucleus 120Sn, making use of the Dyson equation (also known as the Nambu-Gor'kov equation in the case of superfluid systems) to propagate leading medium polarization Nuclear Field Theory (NFT) processes to all orders. Starting from a mean field obtained with the SLy4 effective force (mk ≈ 0.7), we renormaliz

Steam trap valves are mainly used in thermal power systems to pour out condensate water and keep steam inside. While flowingthrough steam trap valves, the condensate water is easy to reach cavitation, which may cause serious damage to the pipingsystem. In this paper, in order to suppress cavitation inside steam trap valves, effects of valve body geometrical parametersincluding orifice diameter, in

Enhancement of mixing efficiency in droplets is of great importance to extend the industrial applications of the liquid-liquid twophase flow in micro-scale. In this paper, mixing efficiency in droplets is investigated via the VOF (volume of fluid) method coupledwith UDS (user defined scalar) model. The cross-shaped T junction with a square cross-section is designed and used for dropletformation. D

In 1553-1554, one Pieter Bruegel retired to Sint-Janshuis, Bergen op Zoom: a home where former servants of the Marquises of Bergen could spend their old age. The main argument of the article is that this retiree, who was the former barber-surgeon of Marquis Jan IV (1541-1567), should be considered as the father of the painter Pieter Bruegel the Elder. The latter’s origins are almost completely unk

Fire evacuation in hospitals is a challenging process that involves the evacuation of patients that are not able to evacuate by themselves and may require assistance. Health-care personnel is generally responsible for assisting the patients during this process. Assisted evacuation in a hospital relies on a pre-determined procedure that defines the priority of patients. The evacuation will depend u

The clinically important MAM blood group antigen is present on haematopoietic cells of all humans except rare MAM-negative individuals. Its molecular basis is unknown. By whole-exome sequencing we identify EMP3, encoding epithelial membrane protein 3 (EMP3), as a candidate gene, then demonstrate inactivating mutations in ten known MAM-negative individuals. We show that EMP3, a purported tumour sup