Physics Letters B 797 (2019) 134820
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
First experimental constraint of the spectroscopic amplitudes for the
α-cluster in the
11
Bground state
Y.P. Shen ( )
a
, B. Guo ( )
a,∗
, T.L. Ma ( )
a
, D.Y. Pang ( )
b,c
, D.D. Ni
(
)
d
, Z.Z. Ren ( )
e
, Y.J. Li ( )
a
, Z.D. An ( )
f
, J. Su ( )
a
, J.C. Liu
(
)
a
, Q.W. Fan ( )
a
, Z.Y. Han ( )
a
, X.Y. Li ( )
a
, Z.H. Li ( )
a
, G. Lian
(
)
a
, Y. Su ( )
a
, Y.B. Wang ( )
a
, S.Q. Yan ( )
a
, S. Zeng ( )
a
, W.P. Liu
(
)
a
a
China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
b
School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
c
Beijing Key Laboratory of Adv anced Nuclear Materials and Physics, Beihang University, Beijing 100191, China
d
Space Science Institute, Macao University of Science and Technology, Macao, China
e
School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
f
School of Physics and Astronomy, Sun Yat-Sen University, Zhuhai 519082, China
a r t i c l e i n f o a b s t r a c t
Article history:
Received
30 November 2018
Received
in revised form 3 July 2019
Accepted
27 July 2019
Available
online 31 July 2019
Editor:
D.F. Geesaman
We present the first experimental determination on the spectroscopic amplitudes (SAs) for the α-cluster
in the
11
Bground state via the
7
Li(
6
Li, d)
11
Breaction using a high-precision magnetic spectrograph. This
is believed to have a strong effect on the studies of α-induced reactions which are crucial in nuclear
astrophysics. It is found that the previous SAs of
11
Bfrom shell model calculations cause overestimations
of up to 23% for the
12
C(α, γ )
16
O S
E2
(300) factor and up to 34% for the
13
C(α, n)
16
O S(190) factor
with respect to the results from the present experimentally determined SAs. Due to the importance of
these two reactions, for example the uncertainty in the
12
C(α, γ )
16
Ocross section at E
c.m.
= 300 keV is
required to be better than 10% by stellar modeling, the new S-factors could result in a potential influence
on the astrophysical network calculations.
© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
1. Introduction
A nuclear cluster can be defined as a spatially located subsys-
tem
which consists of the strongly correlated nucleons. The clus-
tering
in nuclei is one of the most fundamental aspects in nuclear
structure and has been investigated since the early days in the his-
tory
of nuclear physics [1]. The research of the cluster structure
in light nuclei is also an interesting topic [2]. It could generate
a crucial impact on the synthesis of elements in stars via cluster
states like the triple-α cluster state (so-called Hoyle state) at 7.65
MeV in
12
C[3,4]. A cluster is characterized by its intrinsic bind-
ing
stronger than the external binding. Therefore, it is possible to
consider the cluster as a single unit, and to describe its behavior
without reference to its internal structure. The most likely cluster
is, due to its spin and isospin symmetry and hence its high bind-
*
Corresponding author.
E-mail
address: guobing@ciae.ac.cn (B. Guo).
ing energy, the α-particle which can propagate within a nucleus
relatively unperturbed for a significant time [5]. Such a cluster can
be knocked out of the nucleus by an energetic projectile, or it can
be also picked up in a cluster-transfer reaction. These cluster reac-
tions
provide important information on the single-particle and on
the multi-particle character of nuclear states, and thus have been
widely used as powerful nuclear spectroscopic tools [6].
The
α-transfer reactions, being most likely to take place by
cluster transfer, not only can be utilized to investigate nuclear
structure (e.g., α-decay widths [7]) and nuclear reaction mecha-
nisms
[6], but also are of particular interest for the study of as-
trophysical
α-particle induced reactions [8] which are one kind of
the most important reactions in nuclear astrophysics, since helium
is the second most abundant element in the observable universe
after hydrogen. Because the measurements of the α-particle in-
duced
reactions at the low-energy range are greatly hindered by
the Coulomb barrier, indirect techniques (e.g., α-transfer reactions)
are extremely valuable. In particular, these techniques can be used
to deduce the level parameters (i.e., energies, spectroscopic factors
https://doi.org/10.1016/j.physletb.2019.134820
0370-2693/
© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by
SCOAP
3
.
资源评论
weixin_38516804
- 粉丝: 5
- 资源: 930
最新资源
- 三菱FX3U PLC与台达变频器通讯：Modbus RTU协议下的昆仑通态触摸屏控制程序详解,三菱FX3U与台达变频器通讯 器件：三菱FX3U PLC+FX3U 485BD板，台达VFD变频器，昆仑
- 源荷协同优化的低碳性挖掘：运用多时间尺度调度克服碳捕集电厂局限，基于matlab+cplex仿真平台，提升系统低碳性能,内容：挖掘源荷两侧低碳资源并分析其低碳性，荷侧调用不同响应速度的价格型、激励型需
- mongodb可视化工具（兼容较低版本使用）
- 三相异步电机Simulink仿真：中南大学与山河智能合作开发电动叉车高实用性仿真模型与文献分享,三相异步电机simulink仿真 中南大学与山河智能合作开发电动叉车的校企合作项目的仿真模型，感应电机F
- 新时达软件上位机：全协议支持，解除限制，灵活设置运行，电脑调试系统便捷高效,新时达软件上位机，256全协议，007软件 能解除主板限制，能解除轿厢锁 能人为设置运行限制 新时达电脑调试软件多协议，方便
- Comsol光栅波导耦合器：高效耦合效率计算与经典复古小案例,Comsol光栅波导耦合器，耦合效率计算 经典复古小案例 ,核心关键词：Comsol光栅波导耦合器; 耦合效率计算; 经典复古; 小案
- 文件批量重命名工具.exe
- linux系统下安装sysstat以及依赖的cpp
- 半挂汽车列车横向稳定性控制研究：低附路面下的三工况仿真分析与模糊PID等算法应用基于Trucksim与Simulink联合仿真参考论文,半挂汽车列车4自由度6轴整车model，横向稳定性控制，在低附着
- 基于动态粒子群算法的动态环境寻优算法：随机初始化粒子群，适应度评价搜索最优解,Matlab基于动态粒子群算法的动态环境寻优算法 基本粒子群算法首先是在解空间中随机初始化所有粒子，每个粒子位置即代表问题
- 双碳背景下基于Matlab的综合能源系统低碳优化调度策略研究：涉及新能源消纳等多元素综合优化分析,双碳+24小时分时综合能源系统低碳优化调度（用Matlab+Yalmip＋Cplex） 包含新能源消纳
- 参考资料-治理环境、企业寻租与交易成...公司非生产性支出的经验证据.pdf
- [整站程序]LDU v702汉化版_ldu702hh.rar
- 基于lunwen的四永磁同步电机相邻耦合转速同步控制Simulink仿真模型优化与二次开发建议,根据lunwen搭建的四永磁同步电机相邻耦合转速同步控制simulink仿真模型 采用的是PI算法跟随
- Java + LibreOffice + Excel转换为PDF + 工具类
- [整站程序]MyTopix v1.3.0简体中文版_mytopix_v_130.rar
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
