We have measured the contact angle of the interface of phase-separated 3He-4He mixtures against a sapphire window. We have found that this angle is finite and does not tend to zero when the temperature approaches T(t), the temperature of the tricritical point. On the contrary, it increases with temperature. This behavior is a remarkable exception to what is generally observed near critical poin...

The determination of the primeval deuterium abundance has opened a precision era in big-bang nucleosynthesis (BBN), making accurate predictions more important than ever before. We present in analytic form new, more precise predictions for the light-element abundances and their error matrix. Using our predictions and the primeval deuterium abundance we infer a baryon density of Bh = 0:020 0:002 ...

We study shadowing and antishadowing corrections to the flavor nonsinglet structure function F 3He 2 − F 3H 2 and show that the difference between the one-particle density distributions of 3He and 3H plays an important role at very small x. We find that the flavor non-singlet structure function in these mirror nuclei is enhanced at small x by nuclear shadowing, which increases the nuclear Gottf...

The Kohn variational principle and the (correlated) Hyperspherical Harmonics technique are applied to study the n − 3H and p − 3He scattering at zero energy. Predictions for the singlet and triplet scattering lengths are obtained for non–relativistic nuclear Hamiltonians including two– and three– body potentials. The calculated n−3H total cross section agrees well with the measured value, while...

Due to the alpha-particle beam interaction with tritium, two-dimensional spectra of tt, t3He, and dd coincidences are obtained using particle-decay spectroscopy from three-particle 3H(α,tt)p, 3H(α,t 3He)n, 3H(α,td)d reactions (Eα = 67.2 MeV). Excitation energies energy widths for seven excited 4He states, as well ratio their different decay modes, namely t + p, n 3He, d d, by Monte Carlo method.

2014 We describe the superfluid ordering taking place near a wall in 3He-4He mixtures by means of a semi-infinite version of the Blume-Emery-Griffiths model. A renormalization group analysis of the simplest version of this model yields a phase diagram which compares satisfactorily with available experimental data. J. Physique Lett. 45 (1984) L-591 L-596 15 JUIN 1984 Classification Physics Abstr...

Effects of final state interaction on asymmetries in inclusive scattering of polarized electrons on polarized 3He are investigated using consistent 3He bound state wave function and 3N continuum scattering states. Significant effects are found, which influence the extraction of the magnetic neutron form factor from AT ′ . The enhancement found experimentally for ATL′ near the 3N breakup thresho...

HERMES, HERA Measurement of Spin, is an experiment to study the spin structure of the nucleon. The experiment was installed and commissioned in 1995 in the HERA storage ring at the DESY laboratory in Hamburg, Germany. Inclusive and semi-inclusive spin-dependent deep inelastic scattering on polarized internal gas targets are measured simultaneously in a forward spectrometer using. Data were take...

2014 Spin polarized gases such as H~ or 3He~ can propagate damped spin waves at low temperatures; their origin is the so-called « identical spin rotation effect » in collisions between identical particles. We report here the observation of such effects in 3He~ in the temperature range 2 T 6 K, and preliminary measurements of the coefficient 03BC which characterizes the quality factor of the spi...