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Mass formula
About: Mass formula is a research topic. Over the lifetime, 1248 publications have been published within this topic receiving 22043 citations.
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01 Jan 1994
TL;DR: The stability of multiply strange baryonic systems is discussed in the context of a generalized Bethe-Weizsacker mass formula, reproducing the results of mean field calculations which find a broad class of objects composed of neutrons, protons, Λs, and Ξs, table against strong decay, with a strangeness fraction f s =ǀSǀ/A ≈ 1, density ρ ≈ 2ρ0, and charge fraction q/A 1, comparable to those of hypothetical stable strange quark matter as discussed by the authors.
Abstract: The stability of multiply strange baryonic systems is discussed in the context of a generalized Bethe-Weizsacker mass formula, reproducing the results of mean field calculations which find a broad class of objects composed of neutrons, protons, Λ’s, and Ξ’s, table against strong decay, with a strangeness fraction f s =ǀSǀ/A ≈ 1, density ρ ≈ 2ρ0, and charge fraction q/A “ 1, comparable to those of hypothetical stable strange quark matter The generalized mass formula is used to derive stability regions and weak decay patterns for strange hadronic matter
TL;DR: In this article, a spin one-half charged particle based on a modified version of Weyl's unified model of electromagnetism and gravity is presented, which predicts a short-range force which is identified with the strong force.
Abstract: A geometric model of a spin one-half charged particle based on a modified version of Weyl's unified model of electromagnetism and gravity is presented. The model predicts a short-range force which we identify with the strong force. A nuclear mass formula similar to the Weizsacker mass formula provides experimental verification of the geometric approach.
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TL;DR: In this paper, a diquark-triquark pentaquark model involving a recoupling of the five quarks into a Diquark triquark system in non-standard color representations was proposed.
Abstract: We discuss the implications of the suggested interpretation of the recently reported narrow pi N resonance (width \approx 25 MeV at 1680 MeV) as a pentaquark in the same multiplet as the Theta+. We consider a diquark-triquark pentaquark model involving a recoupling of the five quarks into a diquark-triquark system in non-standard color representations. We estimate the mass using a well-tested simple mass formula. Our rough numerical estimate puts the pi N pentaquark resonance at 1720 MeV, sufficiently close to the reported value of 1680 MeV to indicate that this approach deserves further more accurate investigation.
TL;DR: In this paper, Cimento et al. extended the hidden local symmetry of the chiral theory based on the non-linear sigma-model on the manifoldU(3)L×U( 3)R/U (3)V was extended to the baryon interaction and shown to reproduce well the low-energy theorems.
Abstract: In previous papers (Nuovo Cimento A,108 (1995) 241, 1051), the hidden local symmetry of the chiral theory based on the non-linear sigma-model on the manifoldU(3)L×U(3)R/U(3)V was extended to the baryon interaction and shown to reproduce well the low-energy theorems. Introducing anSU(3) breaking in the theory, the mass formula and the Sakurai formula of the electromagnetic interaction of vector mesons are obtained consistently. In this paper, by introducing the effective tensor interactions of orderO(p2), the magnetic form factor of the nucleon is analysed as well as the electric form factor, partly done in the previous papers, and a breaking of the OZI rule and a sizeable content of s-quark pair in both the electric and magnetic form factors of the nucleon are indicated again.
TL;DR: In this article, the authors used Myers and Swiatecki's mass formula and a phenomenological level density formula, originally developed by Gilbert and extended for deformed nuclei by the present authors, to calculate fission fragment distributions based on Fong's statistical theory.
Abstract: Calculation of fission fragment distributions based on Fong's statistical theory was carried out for the case of 241 Am thermal neutron fission using Myers and Swiatecki's mass formula and a phenomenological level density formula, originally developed by Gilbert and extended for deformed nuclei by the present authors. The results show that Fong's statistical theory with the now attainable knowledge on mass and level density, can only account for narrow asymmetric mass peaks centred around A ≃108 and 134. The present results are in good agreement with those calculated by Ignatyuk with a microscopic approach. Other physical quantities associated with fission reaction, such as, kinetic energy distribution, charge distribution and total excitation energy distribution at scission configuration are given. Comparison was also made among various approaches for level density formulation.