Momentum sharing in imbalanced Fermi systems

Hen, O.; Sargsian, M.; Weinstein, L. B.; Piasetzky, E.

doi:10.1126/science.1256785

Title: Momentum sharing in imbalanced Fermi systems

Journal Article · Thu Oct 16 04:00:00 UTC 2014 · Science

DOI: https://doi.org/10.1126/science.1256785 · OSTI ID:1168952

Hen, O. ^[1]; Sargsian, M. ^[2]; Weinstein, L. B. ^[3]; Piasetzky, E. ^[4]

Tel Aviv Univ., Tel Aviv (Israel)
Florida International Univ., Miami, FL (United States)
Old Dominion Univ., Norfolk, VA (United States)
Tel Aviv Univ., Tel Aviv (Israel), et. al.

The atomic nucleus is composed of two different kinds of fermions, protons and neutrons. If the protons and neutrons did not interact, the Pauli exclusion principle would force the majority fermions (usually neutrons) to have a higher average momentum. Our high-energy electron scattering measurements using ¹²C, ²⁷Al, ⁵⁶Fe and ²⁰⁸Pb targets show that, even in heavy neutron-rich nuclei, short-range interactions between the fermions form correlated high-momentum neutron-proton pairs. Thus, in neutron-rich nuclei, protons have a greater probability than neutrons to have momentum greater than the Fermi momentum. This finding has implications ranging from nuclear few body systems to neutron stars and may also be observable experimentally in two-spin state, ultra-cold atomic gas systems.

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Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Contributing Organization:: Jefferson Lab CLAS Collaboration

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1168952

Report Number(s):: JLAB/PHY--14-1998; DOE/OR/23177--3288

Journal Information:: Science, Journal Name: Science Journal Issue: 6209 Vol. 346; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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