The search for neutrinoless double-beta decay(0 b)represents one of the most compelling challenges in modern physics.Observ-ing this elusive nuclear process would not only confirm that neu-trinos are Majorana particle...The search for neutrinoless double-beta decay(0 b)represents one of the most compelling challenges in modern physics.Observ-ing this elusive nuclear process would not only confirm that neu-trinos are Majorana particles-their own antiparticles-but also provide definitive evidence of lepton number violation,offering critical insights into the matter-antimatter asymmetry of the universe.Despite decades of experimental efforts,no conclusive signal has been detected.A key obstacle lies in the persistent theoretical uncertainties surrounding predicted decay rates,which stem pri-marily from the calculation of nuclear matrix elements(NMEs)-the quantum-mechanical factors governing how the decay unfolds within complex nuclei.A major unresolved issue has been the missing short-range contribution,which arises from nucleon over-lap effects and cannot be deduced from long-range pion-exchange interactions alone.展开更多
文摘The search for neutrinoless double-beta decay(0 b)represents one of the most compelling challenges in modern physics.Observ-ing this elusive nuclear process would not only confirm that neu-trinos are Majorana particles-their own antiparticles-but also provide definitive evidence of lepton number violation,offering critical insights into the matter-antimatter asymmetry of the universe.Despite decades of experimental efforts,no conclusive signal has been detected.A key obstacle lies in the persistent theoretical uncertainties surrounding predicted decay rates,which stem pri-marily from the calculation of nuclear matrix elements(NMEs)-the quantum-mechanical factors governing how the decay unfolds within complex nuclei.A major unresolved issue has been the missing short-range contribution,which arises from nucleon over-lap effects and cannot be deduced from long-range pion-exchange interactions alone.
