BrainMap

Mr. Ovidiu-Vasile Nițescu

Researcher

- INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA SI INGINERIE NUCLEARA " HORIA HULUBEI " - IFIN - HH

Researcher | Scientific reviewer

Curriculum Vitae (25/04/2025)

Expertise & keywords

Investigations of beyond standard model physics from theoretical studies of double-beta decay Call name: P 1 - SP 1.1 - Proiecte de cercetare pentru stimularea tinerelor echipe independente - TE-2021
PN-III-P1-1.1-TE-2021-0343 2022 - 2024

Role in this project:

Coordinating institution: CENTRUL INTERNAŢIONAL PENTRU PREGĂTIRE AVANSATĂ ŞI CERCETARE ÎN FIZICĂ-FILIALĂ A INCDFM BUCUREŞTI

Project partners: CENTRUL INTERNAŢIONAL PENTRU PREGĂTIRE AVANSATĂ ŞI CERCETARE ÎN FIZICĂ-FILIALĂ A INCDFM BUCUREŞTI (RO)

Affiliation:

Project website: https://cifra-c2unesco.ro/projects/investigations-of-beyond-standard-model-physics-from-theoretical-studies-of-double-beta-decay/

Abstract:

This project aims to do relevant steps forward in the theoretical study of double-beta decay (DBD). This process is of great interest since it can provide information about the validity of some laws as lepton number conservation, CP and Lorentz invariance (LI) and about the properties of neutrinos (Dirac or Majorana particles?, absolute mass, hierarchy and mechanism of generation, no. neutrino species). These are related to the discovery of the so-called neutrinoless DBD (0νββ) mode which is currently searched experimentally. Accurate predictions of the half-lives, electron spectra, models for mechanisms mediating 0νββ decay, are all necessary and can save significant experimental costs. The general objective of the project is to provide accurate calculations of the nuclear matrix elements (NME), phase-space factors (PSF) and other kinematic factors that will be used to investigate neutrino properties, beyond standard model (BSM) phenomena and LI violation. Specific objectives are: a) obtaining of improved formulas for DBD rates by including new contributions; b) implementation these formulas in the numerical codes for NME and PSF calculation by building up of new routines; c) computations of NMEs and PSFs for (2ν,0ν)ββ transitions and derivation of new limits for the BSM parameters; d) investigation of LI violation in DBD; e) determining the gA value, etc. The results will be published in several ISI ranked journals and presented in relevant conferences. We expect our projec

Contributions to the study of double-beta decay and investigation of physics beyond the Standard Model Call name: P 4 - Proiecte de Cercetare Exploratorie, 2020
PN-III-P4-ID-PCE-2020-2374 2021 - 2023

Role in this project:

Coordinating institution: CENTRUL INTERNAŢIONAL PENTRU PREGĂTIRE AVANSATĂ ŞI CERCETARE ÎN FIZICĂ-FILIALĂ A INCDFM BUCUREŞTI

Project partners: CENTRUL INTERNAŢIONAL PENTRU PREGĂTIRE AVANSATĂ ŞI CERCETARE ÎN FIZICĂ-FILIALĂ A INCDFM BUCUREŞTI (RO)

Affiliation:

Project website: https://cifra-c2unesco.ro/projects/contributions-to-the-study-of-double-beta-decay-and-investigation-of-physics-beyond-the-standard-model/

Abstract:

Double-beta decay (DBD) is the rarest spontaneous nuclear decay process experimentally observed until now with half-lives of the order of 10^20 years. It has a broad potential of discovery mainly due to the search of the decay mode without emission of neutrinos 0νββ decay. Its discovery would provide us with key information about i) neutrino properties (neutrino character: Dirac or Majorana particle and hints about its absolute mass, mass hierarchy, neutrino flavors, existence of sterile neutrinos, etc.), ii) mechanisms which can contribute to 0νββ (such as: exchange of light/heavy neutrinos, exchange of SUSY particles, Majoron emission, contribution from RH currents from the weak interaction, etc.) and iii) on the validity of some conservation laws (lepton number, CP violation, Lorentz invariance, etc.). All these issues are related to physics beyond the SM. In this project we aim to bring significant contributions in the DBD study by doing advances in all parts of the DBD half-lives: the calculation of the phase space factors and nuclear matrix elements, and investigation of beyond SM phenomena as constraints of LNV parameters, Lorentz invariance violation in the neutrino sector, and other related issues.

Extensive use of experience in space and security activities Call name: P 1 - SP 1.2 - Proiecte complexe realizate in consorții CDI
PN-III-P1-1.2-PCCDI-2017-0371 2018 - 2021

Role in this project:

Coordinating institution: INSTITUTUL DE STIINTE SPATIALE-FILIALA INFLPR

Project partners: INSTITUTUL DE STIINTE SPATIALE-FILIALA INFLPR (RO); UNIVERSITATEA DE VEST TIMISOARA (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU OPTOELECTRONICA INOE 2000 INCD (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICA PAMANTULUI - INCDFP RA (RO); UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA (RO); CENTRUL INTERNAŢIONAL PENTRU PREGĂTIRE AVANSATĂ ŞI CERCETARE ÎN FIZICĂ-FILIALĂ A INCDFM BUCUREŞTI (RO); UNIVERSITATEA BUCURESTI (RO); INSTITUTUL ASTRONOMIC (RO); UNIVERSITATEA "DUNAREA DE JOS" (RO); INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA SI INGINERIE NUCLEARA " HORIA HULUBEI " - IFIN - HH (RO)

Affiliation: CENTRUL INTERNAŢIONAL PENTRU PREGĂTIRE AVANSATĂ ŞI CERCETARE ÎN FIZICĂ-FILIALĂ A INCDFM BUCUREŞTI (RO)

Project website: http://www.spacescience.ro/projects/vess

Abstract:

The goal of the project is to improve the institutional performance of the partners, including those with the potential for relaunching, by developing space and security competencies and by encouraging the orientation of research activities in pragmatic directions. Space activity involves the development of technologies and technologies validated in extreme conditions, which have significant applicative potential in various priority economic and social domains.

The VESS project is based on the experience gained by the Coordinator through participation in ESA scientific missions, the development and validation of flight software and hardware components, the development of countermeasures in the context of human crew space missions. Partners contribute with their own skills in areas such as math physics, computer science, advanced technologies, astronomy. VESS will provide knowledge sharing and exploitation within and outside the consortium by creating technology transfer and knowledge transfer offers to other areas of activity. Furthermore, VESS will allow joint use of existing research infrastructures for partners. The four component projects are oriented, each by its specificity, both to the consolidation of the Romanian presence in the activities of ESA, as well as to the capitalization in the economic and social environment of the obtained results. Ensuring synergic interaction between component projects at the level of the complex project will maximize the chances of success and superior valorisation of the results. The joint RDI program to be developed will lay the foundations for a field of competence in space and derivative applications. The offer of services to the socio-economic environment will be achieved by organizing workshops that will be provided with adequate advertising. The patenting of the results will be done by the partners directly involved in the activities that produced these results.

DYNAMICAL EFFECTS IN NUCLEAR DISINTEGRATIONS, INCLUDING FISSION, CLUSTER AND ALPHA DECAY Call name: P 4 - Proiecte de Cercetare Exploratorie
PN-III-P4-ID-PCE-2016-0092 2017 - 2019

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA SI INGINERIE NUCLEARA " HORIA HULUBEI " - IFIN - HH

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA SI INGINERIE NUCLEARA " HORIA HULUBEI " - IFIN - HH (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA SI INGINERIE NUCLEARA " HORIA HULUBEI " - IFIN - HH (RO)

Project website: https://www.theory.nipne.ro/~mirea/index3.html

Abstract:

All types of nuclear disintegrations will be treated in an unitary way within fission models. It is well known that the fission barrier in the actinide region exhibits a double humped shape. This double barrier provided a unified explanation of a large number of experimental results. At excitation energies below or close to the fission barrier top, the properties associated with the double humped shape are more pronounced than in other energy domains. A large number of intermediate resonances appear in the threshold regions. These energies fall exactly in the region of interest of the nuclear reactors. These resonant peaks cannot be evaluated correctly in terms of actual models. For evaluation purposes of the observables required to design a reactor, two ingredients are of major importance: the penetrability of the double barrier parameterized from experimental data and a good model for the nuclear level density. The cross section is proportional with the number of transient states following a Bohr-Wheeler hypothesis dating from 1939. In order to reproduce the resonant structure, many transition states are introduced by hand. An imaginary potential is also introduced in a phenomenological way to adjust the widths of these resonances. The single-particle effects and the dynamics are neglected. In summary, this approach suffers from problems that cannot be surpassed. The predictions concerning the unmeasured nuclei in experiments are questionable. These peculiar aspects can be solved by investigating microscopically the process and new information on the basic mechanism in fission should be provided. In this project, we will treat the nuclear system with quantum mechanics methods to investigate the dependence of the angular momenta on the dissipation energy, the analysis of the state dependent pairing interaction in disintegrations, the dynamics and the fission times in a wide range of mass asymmetries, including cluster and alpha decay.

Neutrino properties derived from the study of rare decay processes at low and high energies Call name: P 4 - Proiecte de Cercetare Exploratorie
PN-III-P4-ID-PCE-2016-0078 2017 - 2019

Role in this project:

Coordinating institution: CENTRUL INTERNAŢIONAL PENTRU PREGĂTIRE AVANSATĂ ŞI CERCETARE ÎN FIZICĂ-FILIALĂ A INCDFM BUCUREŞTI

Project partners: CENTRUL INTERNAŢIONAL PENTRU PREGĂTIRE AVANSATĂ ŞI CERCETARE ÎN FIZICĂ-FILIALĂ A INCDFM BUCUREŞTI (RO)

Affiliation: CENTRUL INTERNAŢIONAL PENTRU PREGĂTIRE AVANSATĂ ŞI CERCETARE ÎN FIZICĂ-FILIALĂ A INCDFM BUCUREŞTI (RO)

Project website: http://cifra.infim.ro/PN-III-P4-ID-PCE-2016-0078.php

Abstract:

Investigation of neutrino properties represents a priority topic of research in physics, from which one expects important results in the next future. This project proposes itself a theoretical study of the neutrino properties by combining the results obtained from the investigation of the 0νββ decay (low-energy process) with results provided by the analysis of several LNV decay channels (high energy processes) within the LHCb experiment. Firstly, we propose ourselves to develop a novel, approach to calculate accurately the phase space factors (F0ν) and nuclear matrix elements (M0ν), two key quantities entering the lifetime formulas, that were computed separately until now in literature. Their computation will be performed in a unitary manner, by deriving a unique formula for their product, and then building a new numerical code where the same nuclear approximations and input parameters be used consistently, for both quantities. In order to eliminate errors associated with large uncertainties of some quantities involved in calculations, we combine our theoretical calculations with experimental results taken from different 0νββ decay experiments. In this way we aim to significantly reduce the uncertainties in the F0ν and M0ν calculation and bring an important achievement in the domain. Then, we derive reliable neutrino parameters and constrain different BSM decay mechanisms. Further, we use information on neutrinos derived from the 0νββ decay and from other low-energy processes, to investigate several rare decays channels of hyperons at high energy, to predict Br bounds and constrain other BSM parameters. These channels can analized within the LHCb experiment at CERN. Such a complementary analysis it is not yet done, and represents another important novel ingredient of the project.

FILE DESCRIPTION	DOCUMENT
List of research grants as project coordinator or partner team leader
Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects