Mass formula

About: Mass formula is a research topic. Over the lifetime, 1248 publications have been published within this topic receiving 22043 citations.

Proton dripline in a new formula for nuclear binding energy

Abstract: The location of the proton dripline in a new phenomenological mass formula is calculated. Predictions of different mass formulas for the dripline are compared. The implications of the new mass formula for rapid proton nucleosynthesis beyond 56 Ni are discussed. It is seen that the new formula indicates that masses up to A = 80 are easily synthesized in a typical X-ray burst.

Global Features of Proton-Neutron Interactions

Abstract: We study global features of proton-neutron (p-n) interactions using double differences of binding energies. The p-n interactions are microscopically investigated using the quasiparticle shell model calculations in an extended P+QQ model proposed recently. It is shown that the isoscalar monopole force and the Q p Q n force are important in determining the behavior of the p-n interaction energies. The relations of respective terms in the empirical mass formula to the mass formula obtained using nuclear interaction are discussed. The symmetry energy originates dominantly in the monopole-type isoscalar p-n force and the J = 0 pairing force.

Bounds on the presence of quantum chaos in nuclear masses

Abstract: Differences between measured nuclear masses and those calculated using the Finite-Range Droplet Model are analyzed. It is shown that they have a well defined, clearly correlated oscillatory component as a function of the proton and neutron numbers. At the same time, they exhibit in their power spectrum the presence of chaos. Comparison with other mass calculations strongly suggest that this chaotic component arises from many body effects not included in the mass formula, and that they do not impose limits in the precision of mass calculations.