[en] The cross sections for ¹⁴N(α,p)¹⁷O reactions at lab angle 165 deg. and incident energies between 5.5 and 7.5 MeV were measured. Angular distribution of protons for an incident energy of 6.576 MeV, which is the energy of the resonance peak of the excitation function of the reaction ¹⁴N(α,p)¹⁷O is presented. Finally, two examples for detecting nitrogen with this reaction are given

No abstract available

[en] In this paper, the differential cross-section for forward recoiling ¹H with ⁴He ions has been determined in the energy range of 1.6–6.0 MeV at a laboratory angle of 30°. A film of ∼54 nm TiH_x on the Si substrate with an overlayer of ∼7 nm Ta on the TiH_x foil was used as the target, and hydrogen loss of the target due to ion bombardment can be fully ignored (<0.1%) through the whole measurement. A method of relative determination for the cross-section measurement was employed to be free from absolute determination of hydrogen content in the target as well as absolute measurements of beam dose and solid angles of the detectors. The uncertainty of the determination is less than 5.2%

[en] The elastic recoil cross section for "1H("1"2C, "1H)"1"2C was determined at a recoil angle of 30° over an incident carbon energy range from 4.0 to 8.0 MeV. The thin solid film target Pd/TiH_x/Si used for cross section measurement was prepared by direct current (DC) magnetron sputtering. The measured cross-section data are compared with records available in literature and a similar trend over the energy range was shown. The total uncertainty in the present cross-section data is less than 7%

[en] The elastic recoil cross section for D("4He, D) "4He was determined at a recoil angle of 30° over an incident helium energy range from 2.6 to 7.4 MeV. A thin solid target Ta/TiD_x/Si used for cross section measurement was prepared by direct current magnetron sputtering, and it was so stable to ion beam bombardment that nearly no deuterium loss (less than 0.2%) exists over the whole experiment. A relative determination method is adopted in this measurement. It can avoid the error from the beam dose and the solid angle of the detectors and it is also free to direct measurement of D content in the film. The total uncertainty in the cross section determination is less than 5%.

[en] The carbon and oxygen contamination on Ti surface strongly influences the hydrogen absorption and desorption capability, and even can completely passivated the surface. The effect of C and O on Ti films is investigated by high-energy non-rutherford backscattering and elastic recoil detection. The experiment results show that the concentration gradient in the region of about 300 nm near the surface is very large due to the joint contamination of about 1.26 x 10¹⁶ cm^-2 C and 2.5 x 10¹⁶ cm^-2 O, and thermal releasing temperature is also increased greatly. Thin Ni film coated on the Ti film may considerably improve the hydrogen absorption and desorption capability

[en] For the interest in using high energy proton elastic backscattering to detect very light elements such as deuterium in titanium, the proton elastic cross sections of titanium were measured at the laboratory angles of 151 deg. (1.0-3.0 MeV) and 170 deg. (2.5-3.1 MeV). These cross section data show clear resonant behavior when the proton energy is higher than 2.0 MeV. A proton backscattering measurement of TiD_x film was performed at 151 deg. to serve as an application of the new cross sections. The simulation results of the backscattering spectra were satisfactory and accurate concentration results were obtained

[en] In this paper, effects of helium bubbles in Ti film samples on their RBS spectrum are investigated theoretically and experimentally. While the stopping power of materials, multiple-scattering of the ions, and factors of the experimental setup affect the RBS spectra, the helium bubbles can affect the RBS spectra, too. The size and density of helium bubble can be calculated when the fraction of total volume occupied by helium bubbles and energy spread due to the helium bubbles are obtained by ion beam analysis. ERDA, RBS and positron annihilation spectrometry are used to examine titanium film samples containing different helium concentrations. The experiment results show that the low energy edges of RBS spectra are broadened when the sample is annealed, or the helium concentration is high,, and the low energy edges of RBS spectra broadening increases with the annealed temperature and the helium concentration. Using nuclear analysis techniques, one is able to know the behavior of helium bubbles in materials, and the real nature of materials as well. (authors)

[en] The kinetics of hydrogen adsorption on thin films in the two-phase regions are studied. It can be classified as four steps: dissociation of hydrogen molecule and chemisorption on the gas/solid interface, surface penetration of hydrogen atoms, diffusion of hydrogen atoms through the hydride layer as well as hydride formation at the metal/hydride interface. It is shown by theoretical and experimental results that at low pressure, hydriding rate-controlling step is mainly chemisorption, and at higher pressure (p_H2 >>p_eq) and approaching equilibrium of system, one of the other steps becomes rate determining step

[en] By using ion beam sputtering, an 85-Angstrom thick nickel layer was deposited on the Zr-Al alloy (non-evaporable getter) to improve the characteristic of the hydrogen absorption. The presputtering for 15 min to clean the surface passivation layer and the vacuum heating treatment of the sample at 750 degree C for 1 h for surface alloying can improve the ability of the gas absorption. The gas absorption experiments show fast absorption kinetics of the hydrogen pumping and good durability against contaminable gases. The Rutherford-back-scattering spectra and the secondary ion mass spectroscopy demonstrate the formation of an alloy of Zr, Al, and Ni in the near-surface area after the thermal process. The elastic recoil detection analysis indicates that the sample holds the original high capacity of hydrogen