Neutrino mass ordering (NMO) is a fundamental problem that remains unresolved, with significant implications for interpreting the origin of neutrino mass, calculating the half-life of neutrinoless double-beta decay and understanding the cosmic structure formation. Current experimental approaches to determine NMO include: (1) Studying vacuum oscillations of reactor neutrinos; (2) Studying...
Geometry-dependent performance evaluation of an HPGe detector is crucial for low-level $\gamma$-ray spectrometry, rare decay studies [Su, J., et al. 2014. NIM A, 763, 364–371], and environmental radioactivity assessments [Tarabini, E., et al. 2023. Appl. Radiat. Isot., 196, 110768]. In this study, the thickness of the top dead layer ($\textrm{t}_{\textrm{d}}$) of an HPGe detector was estimated...
We investigate the atomic exchange effect between the bound electrons of the final atom and those emitted in the allowed $\beta$ decay of the parent nucleus. Electron wave functions are computed using the self-consistent Dirac–Hartree–Fock–Slater method, with orthogonality between continuum and bound states of the final atom enforced by modifying the last iteration of the self-consistent...
We present new constraints on neutrino secret interactions ($\nu$SI) by studying high-energy neutrinos from well-known astrophysical sources, such as SN1987A, the blazars TXS $0506+056$ and PKS $0735+178$, NGC 1068 and KM3-230213A neutrino event. Our analysis focuses on Dirac neutrinos interacting with a massive spin-one boson as they propagate through the Cosmic Neutrino Background (C$\nu$B)....
The coherent elastic neutrino-nucleus scattering (CEvNS) process is a promising approach for investigating neutrino properties and exploring physics beyond the Standard Model. The REactor neutrino LIquid xenon Coherent elastic Scattering experiment (RELICS) plans to deploy a 50-kilogram-scale two-phase liquid xenon time projection chamber (LXeTPC) near the reactor at China's Sanmen Nuclear...
In Type-II seesaw model, an electroweak triplet scalar field $\Delta$ with a non-zero vacuum expectation value (vev) $v_\Delta$ is introduced to facilitate the generation of small neutrino masses. A non-zero $v_\Delta$ also affects the W mass through the electroweak $\rho$ parameter, making it to be less than 1 as predicted by standard model (SM). The component fields in $\Delta$ come along...
Nuclear matrix elements (NMEs) are crucial for understanding weak interaction processes such as inverse beta decay (IBD) and neutrinoless double-beta decay (0νββ), which provide insights into neutrino properties and physics beyond the Standard Model. A novel experimental approach aims to extract NMEs using electromagnetic (EM) transitions from isobaric analog states (IAS). In this talk, I will...
Nowadays, the search for neutrino-less double beta (0νββ) decay continues with undiminished interest since it is a prominent tool for probing neutrino nature and its absolute mass scale. However, the latter task is hampered by the puzzling inconsistencies in the calculations of the nuclear matrix elements (NMEs) of 0νββ decay [1], despite the existing experimental constraints. In this respect,...
The MONUMENT experiment aims to support nuclear matrix element calculations of neutrinoless double beta decay by investigating ordinary muon capture on double-beta daughter isotopes. These measurements were performed at the muon beamline of the Paul Scherrer Institute using a setup of high-purity germanium detectors and scintillator counters. The measured muon lifetimes can be compared to...
The neutrinos from the core collapse SN1987A are the first extrasolar neutrinos to be ever detected and have been widely studied to infer the thermodynamical and temporal features of a supernova; however their interpretation in terms of the astrophysical properties of the explosion has been giving rise to heated debates since ever. At date, models are still under construction and simulations...
