Proton decay in a nucleus: Nonrelativistic treatment of nuclear effects
نویسندگان
چکیده
In this paper, proton decay in a large nucleus is studied in the framework of SU{5) grand unification theory (GUT). By using a method based upon the Green s-function technique of many-body physics, nuclear effects on spectator and pole terms are computed. The decay width in the nucleus is found to be practically the same as in free space. However, nuclear effects are of considerable importance concerning the positron spectrum. A densitycorrelation expansion is introduced which is useful for carrying out a systematic study of nuclear effects in proton decay in a large nucleus. The method presented here can be easily extended to other GUT's or supersymmetric GUT's.
منابع مشابه
Proton decay in a nucleus: Effects of the nuclear surface.
In this paper, a method to deal with proton decay in nuclear matter, previously published, ' is generalized in order to include effects arising from the nuclear surface. Although several theoretical estimates'~ indicate the (eventual) proton decay width in a nucleus to be rather similar to that of an isolated proton, things are different regarding the spectra of the emitted particles (both lept...
متن کاملRelativistic versus nonrelativistic optical potentials in A(e,e'p)B reactions.
We investigate the role of relativistic and nonrelativistic optical potentials used in the analysis of (e, e′p) data. We find that the relativistic calculations produce smaller (e, e′p) cross sections even in the case in which both relativistic and nonrelativistic optical potentials fit equally well the elastic proton–nucleus scattering data. Compared to the nonrelativistic impulse approximatio...
متن کاملCalculating Reaction Rate of Positron Emitters During Proton Therapy Which Are Used In Online PET Scan by Monte Carlo Method
Introduction: Nowadays, cancer is one of the most important concerns in human being's societies, more than one-third of people in around the world will get cancer during their lives. Physical dose depth distribution characteristic of protons in a tissue is determined with a low dose in the entrance region, maximum dose in the Bragg region, and rapid decline takes place near the...
متن کاملNuclear Effects in Proton Decay
An experimental observation of proton decay would be a spectacular proof of Grand Unification. Currently, the best constraint on the proton lifetime for the p → eπ decay channel, coming from the SuperKamiokande experiment, reaches 8 × 10 years. To improve the measurement, much bigger detectors should be constructed. Moreover, a better description of the bound-nucleon states and of the propagati...
متن کاملTissue inhomogeneity in proton therapy and investigation of its effects on BRAGG peak by using MCNPX code
Background: Hadron therapy for malignant tumor is becoming increasingly popular. There are many factors which effect on implementation of a proper treatment planning. The purpose of this work is to investigate the inhomogeneity effects as affecting factor on proton range, Full width at half maximum (FWHM) and 20% position of penumbra (P20) by MCNPX code. Materials and Methods: An inhomogeneous ...
متن کامل