Excited state baryon masses in a quark–diquark model

1989 ◽  
Vol 67 (9) ◽  
pp. 876-880 ◽  
Author(s):  
John W. Norbury
Keyword(s):  
Excited State ◽  
Mass Spectrum ◽  
Qualitative Agreement ◽  
Mass Spectra ◽  
Present Form ◽  
Linear Potential ◽  
Diquark Model ◽  
Experimental Mass Spectrum ◽  
State Baryon

The Lichtenberg diquark model is used to analyze the nucleon and isobar mass spectra using a spin-independent, nonrelativistic linear potential. Qualitative agreement with data is found, leading to the conclusion that the Lichtenberg diquark model, in its present form, is consistent with the experimental mass spectrum.

Ground and Excited State Mass Spectra and Properties of Heavy-Light Mesons

2021 ◽  
Vol 62 (2) ◽  
Author(s):  
Mohamed Allosh ◽  
Yasser Mustafa ◽  
Nour Khalifa Ahmed ◽  
Asmaa Sayed Mustafa
Keyword(s):  
Excited State ◽  
Mass Spectra ◽  
Light Mesons

scholarly journals Excited State Mass Spectra of Ω0cBaryon

2016 ◽  
Vol 759 ◽  
pp. 012076 ◽  
Author(s):  
Z Shah ◽  
K Thakkar ◽  
A K Rai ◽  
P C Vinodkumar
Keyword(s):  
Excited State ◽  
Mass Spectra

scholarly journals On Mass Spectra of Primordial Black Holes

2021 ◽  
Vol 8 ◽  
Author(s):  
Alexander A. Kirillov ◽  
Sergey G. Rubin
Keyword(s):  
Black Holes ◽  
Mass Spectrum ◽  
Mass Spectra ◽  
Scalar Fields ◽  
Small Mass ◽  
Primordial Black Holes ◽  
Classical Motion ◽  
Multiple Production ◽  
Analytical Formulas ◽  
Intrinsic Feature

Evidence for the primordial black holes (PBH) presence in the early Universe renews permanently. New limits on their mass spectrum challenge existing models of PBH formation. One of the known models is based on the closed walls collapse after the inflationary epoch. Its intrinsic feature is the multiple production of small mass PBH which might contradict observations in the nearest future. We show that the mechanism of walls collapse can be applied to produce substantially different PBH mass spectra if one takes into account the classical motion of scalar fields together with their quantum fluctuations at the inflationary stage. Analytical formulas have been developed that contain both quantum and classical contributions.

scholarly journals Spectrometric Study of the Nitrile-Ketenimine Tautomerism

2009 ◽  
Vol 2009 ◽  
pp. 1-18 ◽  
Author(s):  
Hebe Saraví Cisneros ◽  
Sergio Laurella ◽  
Danila L. Ruiz ◽  
Agustín Ponzinibbio ◽  
Patricia E. Allegretti ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Mass Spectrum ◽  
Magnetic Resonance ◽  
Mass Spectra ◽  
Spectrometric Study ◽  
Mass Spectral ◽  
Ion Fragmentation ◽  
Nuclear Magnetic Resonance Spectra ◽  
Amination Product

Mass spectrometry is used to evaluate the occurrence of the nitrile-ketenimine tautomerism. Mass spectra of two differently substituted nitriles, ethyl-4,4-dicyano-3-methyl-3-butenoate and diethyl-2-cyano-3-methyl-2-pentenodiate are examined looking for common mass spectral behaviors. Ion fragmentation assignments for specific tautomers allow to predict the presence of the corresponding structures. Additionally, the mass spectrum and nuclear magnetic resonance spectra of ethyl-4,4-dicyano-2,2-diethyl-3-methyl-3-butenoate and that of the corresponding amination product support the occurrence of the ketenimine tautomer in the equilibrium.

scholarly journals An improved descriptor of cluster stability: application to small carbon clusters

2018 ◽  
Vol 20 (43) ◽  
pp. 27368-27374 ◽  
Author(s):  
José I. Martínez ◽  
Julio A. Alonso
Keyword(s):  
Mass Spectrum ◽  
Carbon Clusters ◽  
Cluster Stability ◽  
Perfect Correlation ◽  
Experimental Mass Spectrum

A novel cluster stability descriptor applied to small cation carbon clusters reveals a perfect correlation with the experimental mass spectrum.

Über Metalltrifluorphosphin-Komplexe. XL. / On Metaltrifluorophosphine-Complexes, XL.

1973 ◽  
Vol 28 (1-2) ◽  
pp. 38-44 ◽  
Author(s):  
Thomas Kruck ◽  
Gerd Sylvester ◽  
Inge-Petra Kunau
Keyword(s):  
Mass Spectrum ◽  
Uv Irradiation ◽  
Mass Spectra ◽  
High Energy ◽  
Metal Bond ◽  
High Energy Electrons ◽  
Metal Metal ◽  
Successive Removal

Orange-red crystals of μ3-phosphido-nonakis(trifluorophosphine)-triiridium, PIr3(PF3)9, are obtained by reductive fluorophosphination of IrCl3 at 80-200 atm PF3-pressure. The structure of the new complex is proven by its mass spectrum, displaying a successive removal of nine PF3-groups. Rupture of the PIr3-cluster occurs only to an extremely small amount even with high energy electrons. UV-irradiation of HCo(PF3)4 and a mixture of HCo(PF3)4 with HIr(PF3)4 yields the bridged complexes (PF3)3Co(H)(PF2)Co(PF3)3 and (PF3)3Co(H)(PF2) Ir(PF3)3. The three complexes (PF3)4M-M(PF3)4 (M = Co or Ir) with a direct metal-metal bond are not obtainable under these conditions. The mass spectra of all compounds and of Ir2(PF3)8 are discussed.

scholarly journals Mass spectra of triply heavy charm-beauty baryons

2019 ◽  
Vol 202 ◽  
pp. 06001
Author(s):  
Zalak Shah ◽  
Ajay Kumar Rai
Keyword(s):  
Excited State ◽  
Quark Model ◽  
Mass Spectra ◽  
Constituent Quark ◽  
Magnetic Moments ◽  
Constituent Quark Model ◽  
Potential Term ◽  
First Order ◽  
Regge Trajectories ◽  
First Order Correction

We extract the mass spectra of triply heavy charm-beauty baryons using Hypercentral constituent quark model. The first order correction is also added to the potential term of Hamiltonian. The radial and orbital excited state masses are also determined. Moreover, the Regge trajectories and magnetic moments are also given for these baryons.

Fast Atom Bombardment Mass Spectrometry of the Vitamin B12 Analogues Hydrogenobalamin and Cupribalamin

1984 ◽  
Vol 39 (2) ◽  
pp. 248-251 ◽  
Author(s):  
Lutz Grotjahn ◽  
Volker B. Koppenhagen ◽  
Ludger Ernst
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrum ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Metal Clusters ◽  
Cobalt Atom ◽  
Vitamin B ◽  
Metal Free ◽  
Characteristic Fragment ◽  
Fab Mass Spectra

Hydrogenobalam in (metal-free vitamin B12) and cupribalamin are characterized by their fast atom bombardment (FAB) mass spectra which show molecular ion and characteristic fragment ion peaks. These spectra and the high-resolution FAB mass spectrum of cobalamin (vitamin B12) show that the (M+H)+-CN-59 peak for the latter is due to loss of acetamide and not of the central cobalt atom. In the FAB mass spectrum of cupribalamin metal clusters are observed

The isolation of 11-oxotetrahydrorhombifoline from Ormosia coutinhoi and a study of its mass spectrum

1967 ◽  
Vol 45 (7) ◽  
pp. 751-757 ◽  
Author(s):  
Stewart McLean ◽  
A. G. Harrison ◽  
D. G. Murray
Keyword(s):  
Mass Spectrum ◽  
Electron Impact ◽  
Mass Spectra ◽  
Equilibrium Theory ◽  
Side Chain ◽  
Fragmentation Reaction ◽  
Quasi Equilibrium ◽  
Molecular Ion ◽  
Dihydro Derivative ◽  
A Minor

11-Oxotetrahydrorhombifoline (I) has been isolated from the alkaloidal extract of the bark of Ormosia coutinhoi, and its dihydro derivative II has been prepared. An examination of the mass spectra of these compounds and of their 3,3-d2 derivatives has led to the elucidation of the course of the major electron impact induced fragmentations undergone by the molecules. The main fragmentation of I leads to loss of C3H5 from the side chain to form an ion of m/e 221, with a minor path involving a central fission of the molecular ion to form an ion of m/e 150. The mass spectrum of II shows that the loss of C3H7 to form the ion of m/e 221 is a minor process, the main fragmentation reaction involving a central fission to form an ion of m/e 152 analogous to the ion of m/e 150 from I. This change in the spectrum is shown to be consistent with predictions based on the quasi-equilibrium theory of mass spectra.

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