scholarly journals 4D-imaging of drip-line radioactivity by detecting proton emission from 54mNi pictured with ACTAR TPC

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J. Giovinazzo ◽  
T. Roger ◽  
B. Blank ◽  
D. Rudolph ◽  
B. A. Brown ◽  
...  
Keyword(s):  
Shell Model ◽  
Resonance Scattering ◽  
Bound State ◽  
Proton Emission ◽  
Four Dimensions ◽  
Quantum Tunnelling ◽  
Theoretical Approaches ◽  
4D Imaging ◽  
Proton Radioactivity ◽  
Nuclear Shell

AbstractProton radioactivity was discovered exactly 50 years ago. First, this nuclear decay mode sets the limit of existence on the nuclear landscape on the neutron-deficient side. Second, it comprises fundamental aspects of both quantum tunnelling as well as the coupling of (quasi)bound quantum states with the continuum in mesoscopic systems such as the atomic nucleus. Theoretical approaches can start either from bound-state nuclear shell-model theory or from resonance scattering. Thus, proton-radioactivity guides merging these types of theoretical approaches, which is of broader relevance for any few-body quantum system. Here, we report experimental measurements of proton-emission branches from an isomeric state in 54mNi, which were visualized in four dimensions in a newly developed detector. We show that these decays, which carry an unusually high angular momentum, ℓ = 5 and ℓ = 7, respectively, can be approximated theoretically with a potential model for the proton barrier penetration and a shell-model calculation for the overlap of the initial and final wave functions.

Resource Letter NSM-1: New insights into the nuclear shell model

2011 ◽  
Vol 79 (1) ◽  
pp. 5-16 ◽  
Author(s):  
David J. Dean ◽  
Joseph H. Hamilton
Keyword(s):  
Shell Model ◽  
Nuclear Shell Model ◽  
Nuclear Shell

scholarly journals AdS superprojectors

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
E. I. Buchbinder ◽  
D. Hutchings ◽  
S. M. Kuzenko ◽  
M. Ponds
Keyword(s):  
Shell Model ◽  
Differential Operators ◽  
Second Order ◽  
Projection Operators ◽  
De Sitter ◽  
Gauge Invariant ◽  
Gauge Transformations ◽  
Four Dimensions ◽  
Higher Spin

Abstract Within the framework of $$ \mathcal{N} $$ N = 1 anti-de Sitter (AdS) supersymmetry in four dimensions, we derive superspin projection operators (or superprojectors). For a tensor superfield $$ {\mathfrak{V}}_{\alpha (m)\overset{\cdot }{\alpha }(n)}:= {\mathfrak{V}}_{\left(\alpha 1\dots \alpha m\right)\left({\overset{\cdot }{\alpha}}_1\dots {\overset{\cdot }{\alpha}}_n\right)} $$ V α m α ⋅ n ≔ V α 1 … αm α ⋅ 1 … α ⋅ n on AdS superspace, with m and n non-negative integers, the corresponding superprojector turns $$ {\mathfrak{V}}_{\alpha (m)\overset{\cdot }{\alpha }(n)} $$ V α m α ⋅ n into a multiplet with the properties of a conserved conformal supercurrent. It is demonstrated that the poles of such superprojectors correspond to (partially) massless multiplets, and the associated gauge transformations are derived. We give a systematic discussion of how to realise the unitary and the partially massless representations of the $$ \mathcal{N} $$ N = 1 AdS4 superalgebra $$ \mathfrak{osp} $$ osp (1|4) in terms of on-shell superfields. As an example, we present an off-shell model for the massive gravitino multiplet in AdS4. We also prove that the gauge-invariant actions for superconformal higher-spin multiplets factorise into products of minimal second-order differential operators.

Theory of the Nuclear Shell Model

1982 ◽  
Vol 56 (2) ◽  
pp. 406-406
Author(s):  
D. A. Bromley
Keyword(s):  
Shell Model ◽  
Nuclear Shell Model ◽  
Nuclear Shell

Using Critical Praxis to Understand and Teach Teamwork

2008 ◽  
Vol 71 (4) ◽  
pp. 421-438 ◽  
Author(s):  
David R. Seibold ◽  
Paul Kang
Keyword(s):  
Classroom Context ◽  
Four Dimensions ◽  
The Third ◽  
Theoretical Approaches ◽  
Practice Of Teaching

The authors pursue three aims in this article. The first is to underscore critical praxis as an especially valuable approach to understanding and enabling teamwork. The second is to offer four dimensions of teamwork—vision, roles, processes, and relationships— as salient areas to interrogate using critical praxis. The third aim is to consider the implications and methods for teaching teamwork in the classroom context. In the process of doing so, the authors highlight limitations of prevailing theoretical approaches and note changes in their own practice of teaching and facilitating teamwork that have occurred through a commitment to critical praxis.

scholarly journals Neutrinoless double beta nuclear matrix elements around mass 80 in the nuclear shell-model

2015 ◽  
Vol 93 ◽  
pp. 01055
Author(s):  
N. Yoshinaga ◽  
K. Higashiyama ◽  
D. Taguchi ◽  
E. Teruya
Keyword(s):  
Shell Model ◽  
Nuclear Matrix ◽  
Nuclear Shell Model ◽  
Matrix Elements ◽  
Nuclear Shell
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