Aresearch procedure designed to capture moment-to-moment experiences by having people carry pagers and take notes describing their activities and emotions whenever the signal sounds is referred to as:

experience-sampling technique.

Explanation:

Experience-sampling technique/method: The term experience-sampling technique/method is also denoted as ESM, and is defined as one of the research procedures in which the researcher studies what different individuals feel, do, and think their day-to-day lives.

ESM often requires to ask different individuals who are involved in the study to provide or give systematic self-reports involving random occasions of waking hours.

In the question above, the given statement represents the experience-sampling technique.