An excess electron can be bound to a molecule in a very diffuse orbital as a result of the long-range contributions of the molecular electrostatic field. Following a systematic search, we report experimental evidence that quadrupole binding occurs for the trans-succinonitrile molecule (EA=20+/-2 meV), while the gauche-succinonitrile conformer supports a dipole-bound anion state (EA=108+/-10 meV...

Precise determinations of the masses of the W boson and of the top quark could stringently test the radiative structure of the Standard Model (SM) or provide evidence for new physics. We analyze the excellent prospects at a muon collider for measuring M W and m t in the W + W − and t ¯ t threshold regions. With an integrated luminosity of 10 (100) fb −1 , the W-boson mass could be measured to a...

The annihilation of new dark matter candidates with masses mX in the MeV range may account for the galactic positrons that are required to explain the 511 keV γ-ray flux from the galactic bulge. We study the impact of MeV-mass thermal relic particles on the primordial synthesis of H, He, and Li. If the new particles are in thermal equilibrium with neutrinos during the nucleosynthesis epoch they...

The vibrational density of states of single-wall carbon nanotubes (SWNT) was obtained from inelastic neutron scattering data from 0 to 225 meV. The spectrum is similar to that of graphite above 40 meV, while intratube features are clearly observed at 22 and 36 meV. An unusual energy dependence below 10 meV is assigned to contributions from intertube modes in the 2D triangular lattice of SWNT bu...

Purpose: This study was to investigate the effect of irregularity in shape of field size of electron beam on the percentage depth dose and the output factor. Study the variety of the Percentage Depth Dose (PDD) and the output factors for rectangular and small field sizes when one of field dimensions less than the Practical Range (Rp) of the electron energy used. Compare the measured output fact...

The absolute strengths of the Eα = 1175 keV resonance in the 6 Li(α, γ) 10 B reaction and of the Eα = 814 keV resonance in the 7 Li(α, γ) 11 B reaction have been measured to ωγ = 366 ± 38 meV and ωγ = 300 ± 32 meV, respectively, in good agreement with previous values. These resonances can be used to measure the absolute acceptance of the recoil separator ERNA to a precision of about 10%.

We report a preliminary Cosmic Diiuse-ray (CDG) spectrum from 800 keV to 30 MeV obtained with the COMPTEL instrument, the Imaging Compton Telescope on-board the Compton Gamma Ray Observatory. The spectrum is constructed by measuring the count rate of rays from high galactic latitudes and rst extrapolating the rate to a zero cosmic-ray ux environment to eliminate the prompt background. The promp...