Physics Letters A
Compton scattering of gamma-rays, XRD, TEM and Raman scattering were used to investigate the nanocrystalline graphite produced by mill grinding. The graphite ground for 4 and 8 hours has a typical nanostructure. Further grinding produces a mixture of nanocrystalline and amorphous phases. Compared with the polycrystalline graphite, the electron momentum distribution probability (EMD) of nanocrystalline graphite is a little higher in the low momentum range. We attribute such a change mainly to the high interface ratio of nanograined graphite.
关键词:
momentum distribution
李建洋
,
左维
,
曹高清
,
U.Lombardo
原子核物理评论
在Extended Brueckner-Hartree-Fock（EBHF）近似下,采用Argonne V18势作为核子-核子相互作用,计算了基态非对称核物质中核子动量的分布。对核子的动量分布对同位旋不对称度的依赖关系进行了描述和讨论。结果表明,在不对称度为零时,质子与中子有着基本相同的动量分布。随着不对称度的增加,在各自的费米面以下,质子动量分布减小而中子动量分布增大。对费米面处的准粒子强度也进行了计算和讨论。本结果较好地满足了两个理论检验标准Migdal-Luttinger theorem和粒子数守恒律。
关键词:
非对称核物质
,
Brueckner理论
,
动量分布
,
准粒子强度
