Three-body model for the two-neutron emission of 16Be

被引：20

作者：

Lovell, A. E. ^{[1
,2
]}

Nunes, F. M. ^{[1
,2
]}

Thompson, I. J. ^{[3
]}

机构：

[1] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

[2] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[3] Lawrence Livermore Natl Lab, L-414, Livermore, CA 94551 USA

来源：

PHYSICAL REVIEW C | 2017年 / 95卷 / 03期

基金：

美国国家科学基金会;

关键词：

CORE EXCITATION; NUCLEI; HE-6;

D O I：

10.1103/PhysRevC.95.034605

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：

Background: While diproton emission was first theorized in 1960 and first measured in 2002, it was first observed only in 2012. The measurement of Be-14 in coincidence with two neutrons suggests that Be-16 does decay through the simultaneous emission of two strongly correlated neutrons. Purpose: In this work, we construct a full three-body model of Be-16 (as Be-14 + n + n) in order to investigate its configuration in the continuum and, in particular, the structure of its ground state. Method: In order to describe the three-body system, effective n-Be-14 potentials were constructed, constrained by the experimental information on Be-15. The hyperspherical R-matrix method was used to solve the three-body scattering problem, and the resonance energy of Be-16 was extracted from a phase-shift analysis. Results: In order to reproduce the experimental resonance energy of Be-16 within this three-body model, a three-body interaction was needed. For extracting the width of the ground state of Be-16, we use the full width at half maximum of the derivative of the three-body eigenphase shifts and the width of the three-body elastic scattering cross section. Conclusions: Our results confirm a dineutron structure for Be-16, dependent on the internal structure of the subsystem Be-15.

引用

页数：9

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