A novel tissue-equivalent proportional counter (TEPC) based on a gas electron multiplier (GEM) for measuring H*(10) for neutrons was designed and constructed. The pulse height spectra (PHS) of two different neutron sources (a 252Cf source and a AmBe source) were measured using the new TEPC. The measurements were made with the TEPC filled with two different gases (10P gas and a propane-based tis...

We consider the nature of the elusive neutron star candidate 1E 161348−5055 using X-ray observations obtained with the ASCA Observatory. The compact X-ray source is centered on the shell-type Galactic supernova remnant RCW 103 and has been interpreted as a cooling neutron star associated with the remnant. The X-ray spectrum of the remnant shell can be characterized by a non-equilibrium ionizati...

8 Elliptic neutron guides are expected to be widely used for construction of long neutron 9 beamlines at the future European Spallation Source and other facilities due to their superiour 10 transmission properties compared to conventional straight guides. At the same time, neutrons 11 traveling long distances are subject to the action of gravity that can significantly modify their 12 flight pat...

The Low Energy Neutron Source (LENS) is an accelerator-based pulsed cold neutron facility under construction at the Indiana University Cyclotron Facility (IUCF). The idea behind LENS is to produce pulsed cold neutron beams starting with ∼MeV neutrons from (p,n) reactions in Be which are moderated to meV energies and extracted from a small solid angle for use in neutron instruments which can ope...

In this paper, we used a neutron diffusion hybrid equation with an external neutron source to calculate nuclear power factors in each fuel element in the reactor core. We used the nodal expansion method to obtain the neutron flux for a given control rods bank position. The results were compared with results obtained for eigenvalue problem near criticality condition and fixed source problem duri...

Chandra or XMM-Newton observations of quiescent low–mass X–ray binaries can provide important constraints on the equation of state of neutron stars. The mass and radius of the neutron star can potentially be determined from fitting a neutron star atmosphere model to the observed X–ray spectrum. For a radius measurement it is of critical importance that the distance to the source is well constra...

Multiplicities of intermediate-mass fragments (IMFs), neutrons, and charged particles were measured for 112Sn 1 112Sn and 124Sn 1 124Sn at EyA ­ 40 MeV. Significantly different scalings of the mean IMF multiplicities with neutron and charged-particle multiplicities are observed for the two reactions. These differences can be qualitatively understood in terms of fragment emission from an expandi...

Spectrum averaged cross sections for the Zn(n, p)Cu, Zn(n, p)Cu and Y(n, p)Sr reactions were measured using a 14 MeV d(Be) neutron source. In each case a clean radiochemical separation was performed and the radioactivity of the product was determined via highresolution γ -ray spectrometry or anticoincidence β− counting. The cross sections are three to five times higher than with a fission neutr...

Neutron howitzers are routinely used in universities to activate samples for instructional laboratory experiments on radioactivity. They are also a convenient source of neutrons and gammas for research purposes, but they must be used with caution. This paper describes the modeling, design, construction, and testing of a portable, economical shield for a 1.0 Curie neutron howitzer. The Monte Car...