Onset of η-meson binding in the He isotopes

被引：27
作者：
Barnea, N. [1 ]
Friedman, E. [1 ]
Gal, A. [1 ]
机构：
[1] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
来源：
NUCLEAR PHYSICS A | 2017年 / 968卷
基金：
以色列科学基金会;
关键词：
Few-body systems; Mesic nuclei; NUCLEAR BOUND-STATES; CHIRAL DYNAMICS; MESIC NUCLEUS; SCATTERING; MODEL;
D O I：
10.1016/j.nuclphysa.2017.07.021
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The onset of binding eta(548) mesons in nuclei is studied in the He isotopes by doing precise eta NNN and eta NNNN few-body stochastic variational method calculations for two semi-realistic NN potentials and two energy dependent eta N potentials derived from coupled-channel models of the N* (1535) nucleon resonance. The energy dependence of the eta N subthreshold input is treated self consistently. It is found that a minimal value of the real part of the eta N scattering length a eta N close to 1 fm is required to bind eta mesons in He-3, yielding then a few MeV 77 binding in He-4. The onset of eta-meson binding in 4He requires that Re a eta N exceeds 0.7 fm approximately. These results compare well with results of recent eta NNN and eta NNNN pionless effective field theory calculations. Related optical-model calculations are also discussed. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：35 / 47
页数：13
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