共查询到20条相似文献,搜索用时 15 毫秒
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S. Calusi E. Colombo L. Giuntini A. Lo Giudice M. Massi E. Vittone 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2008,266(10):2306-2310
In this paper, we describe the main features of the ionoluminescence (IL) apparatus recently installed at the external scanning microbeam facility of the 3 MV Tandetron accelerator of the INFN LABEC Laboratory in Firenze. The peculiarity of this IL set-up resides in the fact that the light produced by the ion irradiation of the specimen is collected by a bifurcated optical fiber, so that photons are shunted both to a CCD spectrometer, working in the 200-900 nm wavelength range, and to a photomultiplier (PMT). The accurate focusing of the optical system allows high photon collection efficiency and this results in rapid acquisition of luminescence spectra with low ion currents on luminescent materials; simultaneously, luminescence maps with a spatial resolution of 10 μm can be acquired through the synchronization of PMT photon detection with the position of the scanning focused ion beam. An optical filter with a narrow passband facing the photomultiplier allows chromatic selectivity of the luminescence centres.The IL apparatus is synergistically integrated into the existing set-up for ion beam analyses (IBA). The upgraded system permits simultaneous IL and PIXE/PIGE/BS measurements. With our integrated system, we have been studying raw lapis lazuli samples of different known origins and precious lapis lazuli artworks of the Collezione Medicea of Museum of Natural History, University of Firenze, aiming at characterising their composition and provenance. 相似文献
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Lina Sheng Mingtao SongXiaoqi Zhang Xiaotian YangDaqing Gao Yuan HeBin Zhang Jie LiuYoumei Sun Bingrong DangWenjian Li Hong SuKaidi Man Yizhen GuoZhiguang Wang Guoqing Xiao 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(20):2189-2192
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E. Colombo S. Calusi R. Cossio A. Lo Giudice C. Manfredotti M. Massi E. Vittone 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2008,266(8):1527-1532
A new ionoluminescence (IL) apparatus has been successfully installed at the external scanning microbeam facility of the 3 MV Tandetron accelerator of the INFN LABEC in Firenze; the apparatus for photon detection has been fully integrated in the existing ion beam analysis (IBA) set-up, for the simultaneous acquisition of IL and PIXE/PIGE/BS spectra and maps.The potential of the new set-up is illustrated in this paper by some results extracted by the analysis of art objects and advanced semiconductor materials. In particular, the adequacy of the new IBA set-up in the field of cultural heritage is pointed out by the coupled PIXE/IL micro-analysis of a lapis lazuli stone; concerning applications in material science, IL spectra from a N doped diamond sample were acquired and compared with CL analyses to evaluate the relevant sensitivities and the effect of ion damage. 相似文献
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F. Pszti Y. K. Park M. Takai 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1997,130(1-4):247-252
Nuclear microprobes with excellent lateral resolution can be realized using a liquid metal ion source and electrostatic einzel lens system in a few hundred keV energy range. In case of ion beam analysis it is better to provide a special detector for Rutherford Backscattering (RBS) analysis or elastic recoil detection. Good mass and depth resolutions should be attained while keeping the damage caused by the beam at tolerable level. Two solutions are considered in the present work: (1) toroidal electrostatic analyzer combined with simultaneous Time-of-Flight (TOF) measurement for mass identification; (2) TOF measurement only, using a large area microchannel plate. Both solutions can be combined with 2D position sensitive anode plates for excellent performance. In case of the first solution, it is possible to distinguish the different mass atoms by the scattering angle where their peak in the angular distribution appears. Similarly to the energy distribution at a fixed scattering angle the angular distribution at a fixed energy represents mass and depth distribution. In case of the second solution the huge acceptance angle will make it possible to analyze submicron spot size without serious beam effects and both heavy and light elements can be investigated. 相似文献
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M. Nakamura K. ImaiM. Hirose H. MatsumotoM. Tosaki D. OhsawaS. Makino 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(24):3153-3157
We have developed a heavy-ion microbeam system for cell irradiation that uses an 8-MV tandem Van de Graaff accelerator at Kyoto University. Using a pair of apertures as the final collimator, microbeams of carbon, fluorine, and silicon were extracted to the atmosphere with few background particles. We used a thin transmission scintillator and a photomultiplier detector to accurately measure the number of extracted particles. To examine beam spreading, the beam profile was measured by observing tracks of an irradiated CR-39 track detector. The two disks with holes which were added to the collimating apertures reduced background radiation due to secondary X-rays and electrons from the apertures. 相似文献
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the ISOLDE Collaboration E. Kugler D. Fiander B. Johnson H. Haas A. Przewloka H. L. Ravn D. J. Simon K. Zimmer 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1992,70(1-4):41-49
The ISOLDE on-line isotope separators have been operated since 1967 at the CERN-SC. This 600 MeV proton synchro-cyclotron had to be shut down in December 1990 after 33 years of service and it was decided to move ISOLDE to a new experimental area. The new on-line mass-separator facility is now under construction at the CERN PS-Booster. This accelerator provides an average current of about 2 μA of 1 GeV protons in very short high intensity pulses at low repetition rate. The beam can hit either one of the two target stations, the general purpose separator (GPS), a reconstructed ISOLDE-2 type machine (which can deliver beams simultaneously into three beam lines), and the high resolution separator (HRS), which is essentially the slightly modified ISOLDE-3 separator. The central GPS beam line and the HRS feed a common beam transport system to which most of the experiments will be connected. The new facility will be taken into operation in spring 1992. 相似文献
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Radiative capture of nucleons at energies of astrophysical interest is one of the most important processes for nucleosynthesis. The nucleon capture can occur either by a compound nucleus reaction or by a direct process. The compound reaction cross sections are usually very small, especially for light nuclei. The direct capture proceeds either via the formation of a single-particle resonance or a non-resonant capture process. In this work we calculate radiative capture cross sections and astrophysical S-factors for nuclei in the mass region A<20 using single-particle states. We carefully discuss the parameter fitting procedure adopted in the simplified two-body treatment of the capture process. Then we produce a detailed list of cases for which the model works well. Useful quantities, such as spectroscopic factors and asymptotic normalization coefficients, are obtained and compared to published data. 相似文献
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Harken AD Randers-Pehrson G Johnson GW Brenner DJ 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(18):1992-1996
A soft X-ray microbeam using proton-induced X-ray emission (PIXE) of characteristic titanium (Kα 4.5 keV) as the X-ray source has been developed at the Radiological Research Accelerator Facility (RARAF) at Columbia University. The proton beam is focused to a 120 μm × 50 μm spot on the titanium target using an electrostatic quadrupole quadruplet previously used for the charged particle microbeam studies at RARAF. The proton induced X-rays from this spot project a 50 μm round X-ray generation spot into the vertical direction. The X-rays are focused to a spot size of 5 μm in diameter using a Fresnel zone plate. The X-rays have an attenuation length of (1/e length of ∼145 μm) allowing more consistent dose delivery across the depth of a single cell layer and penetration into tissue samples than previous ultrasoft X-ray systems. The irradiation end station is based on our previous design to allow quick comparison to charged particle experiments and for mixed irradiation experiments. 相似文献
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F.A. Mirto 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2008,266(10):2113-2116
An electrostatic chopper has been installed in the LABEC laboratory (Sesto Fiorentino) along one of the beamlines of the new Tandetron accelerator. The chopper allows us the creation of a pulsed beam, from a continuous one, with a variable and finely controllable number of particles in each pulse. The facility can be tuned to obtain an average of one ion per pulse. This feature allows us the study of the basic processes of particle-target interactions, useful when performing ion beam analysis. Increasing the beam current, bunches up to thousands of ions can be obtained with a total energy being always an integer multiple of the one of the single ion. This configuration can be employed e.g. in a detector energy calibration. 相似文献
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K. A. Sjland P. Kristiansson M. Elfman K. G. Malmqvist J. Pallon R. J. Utui C. Yang 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1997,130(1-4):20-24
A versatile system for the analysis of the light elements at a Nuclear Microprobe has been constructed. Special reactions for analysis of H (H(p,p)H), Li (7Li(p,)), B (11B(p,)2) and F (19F(p,1e−e+)16O)as well as the general techniques pNRA, PIXE and STIM are employed simultaneously. The set-up is mainly, but not only, intended for thin samples. 相似文献
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K. Yasuda M. NomachiY. Sugaya H. YamamotoH. Komatsu 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(20):2180-2183
Modifications of an in-air microbeam system at the Wakasa Wan Energy Research Center designed to improve its performance are described. In the previous setup, a silicon nitride membrane (area: 1 × 1 mm2; thickness: 100 nm) was used for the beam exit window and the distance between the window and the sample was restricted to ?1.7 mm. Due to this restriction, the beam spot size obtained using the previous setup was 13 × 13 μm2. To reduce the beam spot size, the beam exit window was replaced by a silicon nitride membrane (area: 3 (horizontal) × 2 (vertical) mm2; thickness: 200 nm). In this setup, the sample can be moved as close as 0.7 mm to the window, enabling a beam spot size of 7 × 6 μm2 to be achieved. An additional Si-PIN X-ray detector was installed to estimate the relative number of beam particles. It detects X-rays from the beam exit window. The number of the X-rays from the beam exit window (which is proportional to the number of beam particles) is used for quantitative analysis and for online monitoring of the beam current. This system has the potential to be used for simultaneous particle-induced X-ray emission (PIXE) and particle-induced gamma-ray emission (PIGE) measurements and for studying dental medicine. 相似文献
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Heidel D.F. Bapst U.H. Jenkins K.A. Geppert L.M. Zabel T.H. 《IEEE transactions on nuclear science》1993,40(2):127-134
An ion microbeam radiation test system has been built for studying radiation-induced charge collection and single event upsets in advanced semiconductor circuits. With this system, it is possible to direct an ion beam of a diameter as small as 1 μm onto a circuit or test structure with a placement accuracy of 1 μm. The components of the system and its operation are described. Applications are described which demonstrate the capabilities of the system 相似文献