[en] The LPNHE is a joint research unit (UMR 7585) of the National Institute of Nuclear Physics and Particle Physics (IN2P3), Institute of the National Centre for Scientific Research (CNRS), UPMC and Paris Diderot Paris 7. It hosts several research teams and technical services (computers, electronics, mechanical), and two support services (administration, logistics). The laboratory is engaged in several major experimental programs pursued in the framework of international collaborations with very large research facilities around the world, centers of particle accelerators and observatories. The research programs cover current issues in particle physics, astro-particle and cosmology. This report presents the activities of the laboratory during the years 2010-2012: 1 - Forewords; 2 - Highlights; 3 - Research: Masses and FUNDAMENTAL INTERACTIONS; Matter-antimatter asymmetry; Dark matter and dark energy; Cosmic radiation nature and origin; Publications, communications; 2 - Teaching, training, internships and PhDs; 3 - Competences and technical realisations (electronics and instrumentation, computers, mechanics departments, expertise and valorisation, conference participation, responsibilities); 4 - Laboratory operation (organisation, partnerships, financial and human resources, permanent training, communication and library, health and safety, radiation protection, general services, staff); 5 - Scientific life and communication (seminars, meetings..)

[en] The structural simplicity of the bryophytes exposed them easily to water stress, forcing them to have physiological and biochemical mechanisms that enable them to survive. This study evaluated the variation of total soluble sugars and reducing sugars in relation to relative water content, in Pleurozium schreberi when faced with low water content in the Paramo de Chingaza (Colombia) and under simulated conditions of water deficit in the laboratory. we found that total sugars increase when the plant is dehydrated and returned to their normal content when re-hydrated moss, this could be interpreted as a possible mechanism of osmotic adjustment and osmoprotection of the cell content and cellular structure. Reducing sugars showed no significant variation, showing that monosaccharides do not have a protective role during dehydration.

[en] The nuclear mass correction to the energy of the 1s²2s(Z=21∼30) states are calculated by full core plus correlation (FCPC) wave functions. The formula for calculating the nuclear size correction to the energy are given. The results show nuclear size correction is larger than the nuclear mass correction. The nuclear size correction become important for ions with higher nuclear charge. (authors)

[en] Using the time-dependent multilevel approach (TDMA), the properties of high excited Rydberg lithium atom have been obtained in the microwave field. The population transfer of lithium atom are studied on numerical calculation, quantum states are controlled and manipulated by microwave field. It shows that the population can be completely transferred to the target state by changing the chirped rate and field amplitude. (authors)

[en] In this paper, the spatial resolved emission spectrum of Ni atom in laser induced Ni plasma is measured in the wavelength region from 350 nm to 600 nm. The spatial evolution of the relative intensities and the Stark broadening of the 385.83 nm emission spectrum lines are also obtained. It is shown that Stark broadening and intensity of the spectrum lines increases firstly to its maximum and then de- creases along the direction of laser beam when the distance from the target surface is in the range from 0 to 2.5 mm. The maximum value of Stark broadening and relative intensity of the spectrum lines appear at 1.5 mm from the target surface. (authors)

[en] The C-H bong energy, 1.88 eV, and the bond length, 0.113 nm, are obtained from the calculation with Gaussian03 program. It is known that the H-H bong energy is 4.748 eV and the bond length is 0.074 nm. Obviously, H-H bond energy is greater than the C-H bond energy. So the hydrogen storage of carbon nanotube is due mainly to the physisorption and the chemisorption almost doesn't happen at moderate temperatures and pressures. In addition, LJ potential has been used to calculate the potential between a H₂ molecule and the carbon nanotube. The H₂ molecule is placed in three radial distributions: (a) above the center of a hexagon surrounded by 6 C atoms, (b) above the center of a C-C bond, (c) above the center of a C atom. The result shows that whether the H₂ molecule is adsorbed into and outside the nanotube or to the center and the end of the nanotube, there is the lowest potential when the H₂ molecule is above the center of a hexagon surrounded by 6 C atoms. When the H₂ molecule is absorbed to the center of nanotube, the equilibrium distances between it and the nanotube wall for H2 adsorbed into and outside the nanotube are 0.320 nm and 0. 309 nm, respectively. While in the case that it is adsorbed to the end of the nanotube, the two corresponding distances are 0.324 nm and 0.314 nm, respectively. (authors)

[en] The dissociation energies of five electronic states X¹Σ_g⁺, a³Σ_u⁺, O_g^-, B¹Ⅱ_u and 3³Ⅱ_g of alkali-metal K₂ molecule are calculated using the Sun's algebraic method (AM) based on the perturbation theory. Also the dissociation energies of these states are studied using the new analytical formula proposed recently. The results show that the dissociation energies obtained by new analytical formula agree excellently with the experimental values. It appears that the dissociation energy of an electronic state whose experimental value is not available can be expected using the new formula. (authors)

[en] The adsorption properties of Pt on the Ce₄O₈ nanocluster are studied using the first-principles projector-augmented-wave (PAW) method based on density functional theory (DFT) within local density approximation (LDA) and with the inclusion of on-site Coulomb interaction (DFT+U). The adsorption structures are classified into three types: the single-bond, the double-bond and the multi-bond structures. By a systematic analysis on the most stable configuration, it is found that: (1) there exists a strong interaction between the Pt atom and the Ce₄O₈ nanocluster with a lager adsorption energy than that on the CeO₂ (111) surface; (2) The Pt atom loses electrons (0.42 e), resulting in the reduction of a Ce⁴⁺ to Ce³⁺; (3) A new gap state is induced in the gap between the O2p and Ce4f states, which is very close to the Fermi level and makes the Pt/Ce₄O₈ cluster more active. The results are helpful in under- standing the synergistic effects of the Pt-CeO₂ interaction at the nanoscale. (authors)

[en] Geometrical structures and magnetisms of Rh_nBe(n=1∼7) clusters were studied by using generalized gradient approximation in the density functional theory. The results show that the structures of Rh_n in Rh_nBe clusters are similar to that of the corresponding Rh_n cluster. The bond length between Rh atoms connected with Be atom in Rh_nBe clusters is larger than that between Rh atoms in Rh_n cluster. The changes of stability in Rh_nBe and Rh_n clusters with cluster size are similar to each other, but Rh_nBe clusters are more stable. Be atoms lose electrons and the magnetic moments become smaller in all Rh_nBe clusters. All Rh atoms connected with Be atom receive electrons. Magnetic moments of Rh_nBe clusters are due mainly to Rh atoms. If Be atom has positive magnetic moment, the magnetic moment of Rh_nBe cluster is larger than that of Rh_n cluster, else it is smaller. (authors)

[en] Using density function theory, the photoelectron spectroscopy of Au_nA_g^-(n+m=2∼4) clusters have been calculated, the calculated results agree with the experimental values, except of Au₂Ag₂^- cluster in which there is a 0.5 eV red-shift in first peak compared with experiments. It appears that the geometry of Au_nA_g^-(n+m=2∼4) clusters obtained in our works is reasonable. (authors)