نتایج جستجو برای: neutron decay
تعداد نتایج: 117888 فیلتر نتایج به سال:
We describe a reaction mechanism which is consistent with all available experimental information of high energy three-body breakup processes. The dominating channels are removal of one of the three halo particles leaving the other two either undisturbed or absorbed. We compare with the commonly used deceptive assumption of a decay through two-body resonance states. Our predictions can be tested...
Neutrons study a number of hot topics from the field of particle physics and cosmology: Recent measurements of various mixed American-British-French-GermanHungarian-Japan-Russian groups of researchers determine the strength of the weak interaction of the neutron, which gives us unique information on quark-mixing and the question of unitarity. Much to our surprise, with neutron-decay we find a d...
Decay studies of very neutron-deficient nuclei ranging from 39 Ti to 49 Ni have been performed during a projectile fragmentation experiment at the GANIL/LISE3 separator. 49 Ni, half-lives and decay spectra have been measured. In a few cases, γ coincidence measurements helped to successfully identify the initial and final states of transitions. In these cases, partial decay scheme are proposed. ...
In cavitation experiments with deuterated acetone, tritium decay activity above background levels was detected. In addition, evidence for neutron emission near 2.5 million electron volts was also observed, as would be expected for deuterium-deuterium fusion. Control experiments with normal acetone did not result in tritium activity or neutron emissions. Hydrodynamic shock code simulations suppo...
Fundamental symmetry tests with neutrons can provide unique information about whatever will be the new Standard Model of fundamental interactions. I review two aspects of this possibility: searches for the permanent electric dipole moment of the neutron and its relation to the origin of baryonic matter, and precision studies of neutron decay that can probe new symmetries. I discuss the compleme...
An experiment aiming at the simultaneous determination of both transversal polarization components of electrons emitted in the decay of free neutrons begins data taking using the polarized cold neutron beam (FUNSPIN) from the Swiss Neutron Spallation Source (SINQ) at the Paul-Scherrer Institute, Villigen. A non-zero value of R due to the e(-) polarization component, which is perpendicular to th...
Electron – impurity scattering in the crust of neutron stars may be a relevant mechanism in delaying the cooling and in enhancing the decay of the pulsar’s magnetic field. Extending previous work, in the present note I investigate the physics of the interfaces between layers in the crust of an isolated neutron star. The calculations confirm the possible presence of high impurity concentrations ...
On the stochastic gravitational radiation background produced by an ensemble of single neutron stars
The possible stochastic background produced by single galactic neutron star is studied. The upper limit to this background independent of the NS ellipticities is derived. If ∼ 0.1 of old neutron star population have a low surface magnetic field (< 107 G; from the beginning or due to field decay), this background may be detected by the advanced LIGO/VIRGO interferometerswith a sensitivity of∼ 10...
I review of the observational properties of Soft Gamma Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs), two unusual manifestations of neutron stars. I summarize the reasoning for SGRs being “magnetars,” neutron stars powered by the decay of a very large magnetic field, and the now compelling evidence that SGRs and AXPs are in fact members of the same source class, as predicted uniquely by t...
We report the discovery of nearly coherent oscillations with a frequency of ∼ 567 Hz during type-I X-ray bursts from the X-ray transient and eclipsing binary X 1658–298. If these oscillations are directly related to the neutron star rotation then the spin period of the neutron star in X 1658–298 is ∼1.8 ms. The oscillations can be present during the rise or decay phase of the bursts. Oscillatio...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید