Properties of 8,979 nuclei ranging from O to 136 and extending from the proton drip line to the neutron drip line have been calculated by use of the 1992 version of the finite-range droplet model. The calculated quantities include the ground-state mass, deformation, microscopic correction, odd-proton and oddneutron spins and parities, proton and neutron pairing gaps, binding energy, oneand two-...

In October 1934, at a meeting of the Osaka Branch of the PhysicoMathematical Society of Japan, Hideki Yukawa proposed a new theory of nuclear forces involving the exchange between neutron and proton of an electrically charged “heavy quantum”.l Yukawa’s theory is known today as the meson theory of nuclear forces and his “heavy quantum” is called the meson.2 The theory provided a fundamental expl...

Experiment using gravitationally trapped ultracold neutrons (UCNs) to measure the neutron lifetime is reviewed. The precise value of the neutron lifetime is of fundamental importance to particle physics and cosmology. In our experiment, the UCN storage time is brought closest ever to the neutron lifetime: the probability of the UCN loss from the trap was only 1% of that for neutron β-decay. The...

We report on the long term average spin period, rate of change of spin period and X-ray luminosity during outbursts for 42 Be X-ray binary systems in the Small Magellanic Cloud. We also collect and calculate parameters of each system and use this data to determine that all systems contain a neutron star which is accreting via a disc, rather than a wind, and that if these neutron stars are near ...

We report on the March-April 1997 BeppoSAX observations of Aql X-1, the first to monitor the evolution of the spectral and time variability properties of a neutron star soft X–ray transient from the outburst decay to quiescence. We observed a fast X–ray flux decay, which brought the source luminosity from ∼ 1036 to ∼ 1033 ergs−1 in less than 10 days. The X–ray spectrum showed a power law high e...

The value of the V ud matrix element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix can be derived from nuclear superallowed beta decays, neutron decay, and pion beta decay. We survey current world data for all three. Today, the most precise value of V ud comes from the nuclear decays; however, the precision is limited not by experimental error but by the estimated uncertainty in theoretical cor...