Identify the missing particle in the following nuclear equation: 
Pb →
E + ?
Definitions:
Flow
A psychological state of complete immersion and focused concentration in an activity, often resulting in a loss of the sense of time.
Measurably Happier
A state in which an individual's happiness or well-being can be quantitatively assessed or increased.
Hypertension
A medical condition characterized by persistently high blood pressure, which can lead to serious health issues such as heart disease and stroke.
Immune System
The body's defense mechanism made up of organs, tissues, cells, and proteins that work together to fight off pathogens, such as bacteria, viruses, and foreign bodies.
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