Alpha particle detection with GaN Schottky diodes
A. Y. Polyakov, N. B. Smirnov, A. V. Govorkov, A. V. Markov, E. A. Kozhukhova et al.
Ni/GaN Schottky diode radiation detectors were fabricated on 3-[mu]m-thick unintentionally doped n-GaN films grown by molecular beam epitaxy (MBE) and metal organic chemical vapor deposition (MOCVD) and on 12-[mu]m-thick undoped n-GaN layers prepared by epitaxial lateral overgrowth (ELOG). The rever ... [J. Appl. Phys. 106, 103708 (2009)] published Tue Nov 17, 2009.
Pr-doped fluoro-oxide lithium glass as scintillator for nuclear fusion diagnostics
Yasunobu Arikawa, Kohei Yamanoi, Tomoharu Nakazato, Elmer Surat Estacio, Toshihiko Shimizu et al.
Experimental results are presented on the neutron scintillating properties of a custom-designed Pr3+(praseodymium)-doped lithium (Li) glass. Luminescence was observed at 278 nm wavelength, originating from the 5d-4f transition. Time-resolved measurements yielded about 20 ns decay times for ultraviol ... [Rev. Sci. Instrum. 80, 113504 (2009)] published Fri Nov 13, 2009.
X-ray irradiation effects on the trapping properties of CdZnTe detectors
B. Fraboni, L. Pasquini, A. Castaldini, A. Cavallini, and P. Siffert
CdZnTe-based detectors possess unique properties as room-temperature x- and gamma-ray detectors. We report on the effects of x-ray irradiation on CdZnTe and CdTe:Cl detectors with increasing x-ray doses. We correlate the macroscopic performance of the detectors, investigated by gamma-ray spectroscop ... [J. Appl. Phys. 106, 093713 (2009)] published Fri Nov 13, 2009.
Lifetime of the 7s6d D atomic state of radium
W. L. Trimble, I. A. Sulai, I. Ahmad, K. Bailey, B. Graner et al.
The lifetime of the 7s6d D state of atomic radium is determined to be 385(45) [mu]s using cold Ra atoms prepared in a magneto-optical trap. The D state is populated from the decay of the P state which is excited by a pulse of 483 nm light. The decay of the D state is observed by detecting delayed f ... [Phys. Rev. A 80, 054501 (2009)] published Tue Nov 10, 2009.
Direct high-resolution ion beam-profile imaging using a position-sensitive Faraday cup array
Lauri Panitzsch, Michael Stalder, and Robert F. Wimmer-Schweingruber
Ion sources have wide-spread use in a multitude of applications. For many, an accurate knowledge, or better, an accurate imaging, of the beam profile and intensity is an important criterion. We are developing an ion source to calibrate instruments for space-based measurements of solar wind and supra ... [Rev. Sci. Instrum. 80, 113302 (2009)] published Tue Nov 10, 2009.
The PTB neutron reference fields (PIAF)quasi-monoenergetic neutron reference fields in the energy range from thermal to 200 MeV
S. Rottger, R. Bottger, F. D. Brooks, A. Buffler, J.-P. Meulders et al.
Well-characterized neutron fields are a prerequisite for the investigation of neutron detectors. Partly in collaboration with external partners, the PTB neutron metrology group makes available for other users neutron reference fields covering the full energy range from thermal to 200 MeV. The specif ... [AIP Conf. Proc. 1175, 375 (2009)] published Mon Nov 9, 2009.
The rotation of scissioning nucleus considered trajectory calculations for ternary fission induced by cold polarized neutrons
I. Guseva and Yu. Gusev
On the base of modified trajectory calculations the shift of angular distribution of alpha-particles accompanied the reaction U(n,f) induced by cold polarized neutrons is evaluated. It was supposed that angular distribution shift is caused by the rotation of nuclear system before scission. The orien ... [AIP Conf. Proc. 1175, 355 (2009)] published Mon Nov 9, 2009.
Characterization of LaCl:Ce detectors for prompt fission gamma-ray measurements
A. Oberstedt, R. Billnert, J. Karlsson, S. Oberstedt, W. Geerts et al.
The properties of cylindrical 1.5[double-prime] x 1.5[double-prime]LaCl:Ce scintillation detectors were determined. For the energy resolution values between 3.8 and 4.2% at 662 keV were observed, following the expected E behavior. The intrinsic full peak efficiency was determined to be more than 50% ... [AIP Conf. Proc. 1175, 257 (2009)] published Mon Nov 9, 2009.
New experimental U(n,f) prompt fission neutron spectrum and old disagreement between microscopic and macroscopic data
N. Kornilov, F.-J. Hambsch, I. Fabry, S. Oberstedt, T. Belgya et al.
A measurement of the U Prompt Fission Neutron Spectrum (PFNS) was performed at the Budapest Nuclear Research Reactor at 100 K incident neutron energy. The motivation of this experiment is based on the discrepancy between literature data and the fact that the measured PFNS at thermal incident neutron ... [AIP Conf. Proc. 1175, 249 (2009)] published Mon Nov 9, 2009.
Time-odd effects and the spectroscopic properties of odd-mass fission fragments
P. Quentin, N. Minkov, L. Bonneau, and D. Samsoen
Adding an extra nucleon having a definite K-value to an axially symmetrical even-even core generates a breaking of the time-reversal symmetry. Within the Skyrme-Hartree-Fock approach the effects of the time-odd mean-field terms resulting from the presence of non-vanishing current and spin-vector den ... [AIP Conf. Proc. 1175, 174 (2009)] published Mon Nov 9, 2009.
New insights into the collective band structures of nuclei with A = 100112
J. H. Hamilton, S. J. Zhu, Y. X. Luo, A. V. Ramayya, J. O. Rasmussen et al.
With our high statistics gamma-gamma-gamma data set taken with Gammasphere, we have identified a variety of new phenomena in A = 100112 nuclei. The one- and two- phonon gamma bands in Mo have been extended and similar bands identified in Mo and for the first time in both an odd N nucleus, Mo and an ... [AIP Conf. Proc. 1175, 166 (2009)] published Mon Nov 9, 2009.
Uncertainties for criticality-safety benchmarks and consequences for nuclear data measurements
D. Rochman, A. J. Koning, and S. C. van der Marck
We have developed a new method to propagate the uncertainties of fundamental nuclear physics models and parameters used in nuclear data evaluation to the design and performance of future nuclear energy systems. Using Monte Carlo simulation, it is for the first time possible to couple these two field ... [AIP Conf. Proc. 1175, 95 (2009)] published Mon Nov 9, 2009.
Symmetric/asymmetric p- and n-induced fission of Th, Pa, U and Np
Vladimir M. Maslov
The excitation energy and nucleon composition dependence of the transition from asymmetric to symmetric scission of fission observables of Th(Pa) and U(Np) nuclei is interpreted for nucleon-induced fission cross sections of Th(p,F)(Th(n,F)) and U(p,F) (U(n,F)) reactions at E = 1200 MeV. Predominantl ... [AIP Conf. Proc. 1175, 87 (2009)] published Mon Nov 9, 2009.
Calibration of a liquid xenon detector with Kr
L. W. Kastens, S. B. Cahn, A. Manzur, and D. N. McKinsey
We report the preparation of a Kr source and its use in calibrating a liquid xenon detector. Kr atoms were produced through the decay of Rb and introduced into liquid xenon. Decaying Kr nuclei were detected through liquid xenon scintillation. Conversion electrons with energies of 9.4 and 32.1 keV fr ... [Phys. Rev. C 80, 045809 (2009)] published Fri Oct 30, 2009.
Velocity map imaging using an in-vacuum pixel detector
Georg Gademann, Ymkje Huismans, Arjan Gijsbertsen, Julia Jungmann, Jan Visschers et al.
The use of a new type in-vacuum pixel detector in velocity map imaging (VMI) is introduced. The Medipix2 and Timepix semiconductor pixel detectors (256 x 256 square pixels, 55 x 55 [mu]m) are well suited for charged particle detection. They offer high resolution, low noise, and high quantum efficie ... [Rev. Sci. Instrum. 80, 103105 (2009)] published Thu Oct 22, 2009.
Modal response of 4-rod type radio frequency quadrupole linac
Avik Chatterjee, Abhijit Mahapatra, Manas Mondal, and Alok Chakrabarti
This paper deals with the analysis and experimental study of natural frequencies of vibration of a 4-rod type radio frequency quadrupole (RFQ) linear accelerator. The eigenvalue analysis of the structure has been done both analytically (multispan beam concept) as well as using blocked Lanczos eigenv ... [Rev. Sci. Instrum. 80, 103303 (2009)] published Wed Oct 21, 2009.
Transmission of cluster ions through a tandem accelerator of several stripper gases
Yuichi Saitoh, Atsuya Chiba, and Kazumasa Narumi
The transmissions of carbon cluster ion beams through a tandem accelerator using several stripper gases (He, N, CO, and SF) with a terminal voltage of 2.5 MV were measured as a function of the gas pressure in investigating the most suitable gas for cluster ion acceleration. This resulted in it being ... [Rev. Sci. Instrum. 80, 106104 (2009)] published Thu Oct 15, 2009.
Scaling Fixed-Field Alternating Gradient Accelerators with a Small Orbit Excursion
Shinji Machida
A novel scaling type of fixed-field alternating gradient (FFAG) accelerator is proposed that solves the major problems of conventional scaling and nonscaling types. This scaling FFAG accelerator can achieve a much smaller orbit excursion by taking a larger field index k. A triplet focusing structure ... [Phys. Rev. Lett. 103, 164801 (2009)] published Wed Oct 14, 2009.
Head-on beam-beam compensation investigation in an electron-ion collider using weak-strong simulations
Christoph Montag and Wolfram Fischer
The luminosity of the ring-ring version of the proposed electron-ion collider eRHIC is limited by the beam-beam effect on the electrons. Once the beam-beam limit is reached, the luminosity no longer increases linearly with the bunch intensity of the ion beam, but begins to saturate and even drops ag ... [Phys. Rev. ST Accel. Beams 12, 084001 (2009)] published Tue Oct 13, 2009.
Tracking studies of the Compact Linear Collider collimation system
I. Agapov, H. Burkhardt, D. Schulte, A. Latina, G. A. Blair et al.
A collimation system performance study includes several types of computations performed by different codes. Optics calculations are performed with codes such as MADX, tracking studies including additional effects such as wakefields, halo and tail generation, and dynamical machine alignment are done ... [Phys. Rev. ST Accel. Beams 12, 081001 (2009)] published Tue Oct 13, 2009.
Microbunching instability in a chicane: Two-dimensional mean field treatment
Gabriele Bassi, James A. Ellison, Klaus Heinemann, and Robert Warnock
We study the microbunching instability in a bunch compressor by a parallel code with some improved numerical algorithms. The two-dimensional charge/current distribution is represented by a Fourier series, with coefficients determined through Monte Carlo sampling over an ensemble of tracked points. T ... [Phys. Rev. ST Accel. Beams 12, 080704 (2009)] published Tue Oct 13, 2009.