Universality of nucleon-nucleon short-range correlations: Two-nucleon momentum distributions in few-body systems

作者：Alvioli M^*; degli Atti C Ciofi; Kaptari L P; Mezzetti C B; Morita H; Scopetta S

来源：Physical Review C, 2012, 85(2): 021001.

DOI：10.1103/PhysRevC.85.021001

Using realistic wave functions, the proton-neutron and proton-proton momentum distributions in He-3 and He-4 are calculated as a function of the relative, k(rel), and center of mass, K-c.m., momenta and the angle between them. For large values of k(rel) greater than or similar to 2 fm(-1) and small values of K-c.m greater than or similar to 1.0 fm(-1), both distributions are angle independent and decrease with increasing K-c.m., with the pn distribution factorizing into the deuteron momentum distribution times a rapidly decreasing function of K-c.m., in agreement with the two-nucleon (2N) short-range correlation (SRC) picture. When K-c.m. and k(rel) are both large, the distributions exhibit a strong angle dependence, which is evidence of three-nucleon (3N) SRC. The predicted center of mass and angular dependence of 2N and 3N SRC should be observable in two-nucleon knock-out processes A(e, e%26apos; pN) X.

• 出版日期2012-2-17