http://hdl.handle.net/123456789/17 JNP 2026-04-13T04:21:56Z http://hdl.handle.net/123456789/938 Title: On the role of nuclear quantum gravity in understanding nuclear stability range of Z = 2 to 118 Authors: Seshavatharam, UVS; Lakshminarayana, S Abstract: To understand the mystery of final unification, in our earlier publications, we proposed two bold concepts: 1) There exist three atomic gravitational constants associated with electroweak, strong and electromagnetic interactions. 2) There exists a strong elementary charge in such a way that its squared ratio with normal elementary charge is close to reciprocal of the strong coupling constant. In this paper we propose that, ℏc can be considered as a compound physical constant associated with proton mass, electron mass and the three atomic gravitational constants. With these ideas, an attempt is made to understand nuclear stability and binding energy. In this new approach, with reference to our earlier introduced coefficients k = 0.00642 and f = 0.00189, nuclear binding energy can be fitted with four simple terms having one unique energy coefficient. The two coefficients can be addressed with powers of the strong coupling constant. Classifying nucleons as ‘free nucleons’ and ‘active nucleons’, nuclear binding energy and stability can be understood. Starting from , number of isotopes seems to increase from 2 to 16 at and then decreases to 1 at For Z >= 84, lower stability seems to be, Alower=(2.5 to 2.531)Z. 2019-08-13T00:00:00Z http://hdl.handle.net/123456789/937 Title: Radon Progeny Recoil Effect in Retrospective Indoor Glass Dosimetry Authors: Tibambre-Heredia, C.D.; Olaya-Dávila, H.; Sevilla, A.C.; Samasundaram, R.; Lopez, J.A.; Martinez-Ovalle, S.A.; Sajo-Bohus, L. Abstract: Radon gas diffusion and progeny transport in air, are mechanisms to be considered in retrospective glass dosimetry. With the aim to contribute to the understanding of the Rn progeny recoil energy role in this dosimetry methodology, we carried out a simulation employing GEANT4 code. In that, we assumed the chemical compound of the glass that is used commonly in households. Results are compared to experimentally measured 210Bi concentration to show that the recoil energy helps the progenies incrustation, mainly for the 218,214Po alpha emitters but do not influence bismuth-210 diffusion directly. A significant difference exists between our results and measured values; that is interpreted as due to atomic displacement by primary knock-on atoms. The SiO2 molecule binding energy breaks and the following ion recombination, induce a structural modification between the atom by e.g. cavities formation in such a way that reduces significantly the radon progeny diffusion speed. 2019-08-13T00:00:00Z http://hdl.handle.net/123456789/936 Title: Time Resolution Measurements on SiPM for High Energy Physics Experiments Authors: Montano, L.M.; Fontaine, M. Abstract: Scintillator detector have been used in a wide range of experiments in different areas: Nuclear and High Energy Physics, Medicine, and Radiation Security among others. It is common to use scintillator counters coupled to Photomultiplier Tubes (PMT) as a read out detectors. Nowadays, there has been a great interest in using the Silicon Photomultipliers (PMSi) as a replacement for PMT's due to their high photon detection efficiency (PDE) and their high single photon time resolution (SPTR). The fast the signal is detected, the whole detection system will be useful to search for new physics. PMSi is also known to have a good compactness, magnetic field resistance and low cost. In our lab we are measuring the time resolution of two different models of PMS in order to build a fast radiation detector system. 2019-08-13T00:00:00Z http://hdl.handle.net/123456789/935 Title: The Performance of PIXE Technique through a Geochemical Analysis of High Grade Rocks Authors: Avupati, Venkata Surya Satyanarayana; Jagannadharao, M.; Mouli, K. Chandra; Seetaramireddy, B. Abstract: It has been an argument that some of the elements present in geological material by using PIXE analysis are purely determined or could not be determined at all, due to various reasons including the matrix. It is felt that a systematic investigation needs to be designed and implemented to understand the limitation of PIXE in certain elements. The high-grade rocks selected are analyzed both by PIXE as well as AAS and the results are authenticated by using a USGS reference material, Basalt, studies of literature. It is believed that the accuracy of problematic elements, especially from high grade rock can be improved and the conditions of PIXE can be standardized for various elements under different combinations. The reasons behind the poor performance of Proton Induced X- ray Emission in case of certain elements have been established. 2019-08-13T00:00:00Z