Washington ? Peter Diamond’s research on unemployment is good enough to earn him the Nobel Prize in economics — but not to get him on the Federal Reserve.

Diamond, an economist at the Massachusetts Institute of Technology, and two other economists were honored Monday for their work in explaining why unemployment can remain high despite large numbers of job openings — a trend that is playing out today.

The other economists were Dale Mortensen, an economics professor at Northwestern University, and Christopher Pissarides, a professor at the London School of Economics. The three men will share the $1.5 million prize.

President Barack Obama nominated Diamond to the Fed in late April. But Senate Republicans have blocked his nomination, questioning his practical experience, as well as the conclusions of his research.

In the early 1980s, Diamond wrote a paper that found federal unemployment insurance helps companies land job seekers with the right skills by allowing the unemployed to hold out for the right opportunity.

Some Republicans argue that extending unemployment benefits — as Congress has done on multiple occasions since the recession — can actually make unemployment worse by taking away the incentives to finding work. Liberal economists dismiss that.

Sen. Richard Shelby of Alabama, the senior Republican on the Senate Banking Committee, has been blocking Diamond’s nomination to the Fed for months. Shelby says Diamond lacks expertise in so-called monetary policy — the setting of interest rates and other tools that are used to influence the nation’s economic growth, employment and inflation.

“While the Nobel Prize for economics is a significant recognition, the Royal Swedish Academy of Sciences does not determine who is qualified to serve on the Board of Governors of the Federal Reserve System,” Shelby said Monday.

The Royal Swedish Academy of Sciences said it chose Diamond, Mortensen and Pissarides for work that helps economists and others “understand the ways in which unemployment, job vacancies and wages are affected by regulation and economic policy.”

Dating back to the 1970s and 1980s, their work gave economists a new way to look at unemployment trends. They focused on factors such as the skills job seekers have, how they hunt for jobs and the needs of employers. Their work challenged the classical view of markets, where buyers and sellers always find each other. In the real world, sometimes they don’t, the Nobel winners found.

Job seekers and job providers, for instance, can encounter obstacles along the way. The skills workers have may not match the skills employers want. Job seekers may not be able to move to a new city for work. Some applicants may jump at the first offer they get, even though it’s not the best match.