scholarly journals Investigations of the few-nucleon systems within the LENPIC project

2020 ◽  
Author(s):  
Jacek Golak ◽  
Evgeny Epelbaum ◽  
Alessandro Grassi ◽  
Kamada Hiroyuki ◽  
Hermann Krebs ◽  
...  
Keyword(s):  
Nuclear Physics ◽  
Nucleon Nucleon ◽  
Chiral Expansion ◽  
Low Energy ◽  
Current Status ◽  
Special Role ◽  
Nuclear Forces ◽  
Deuteron Scattering ◽  
Medium Mass ◽  
Low Energy Nuclear Physics

Results presented in this contribution are obtained within the Low Energy Nuclear Physics International Collaboration (LENPIC). LENPIC aims to develop chiral nucleon-nucleon and many-nucleon interactions complete through at least the fourth order in the chiral expansion. These interactions will be used together with consistently derived current operators to solve the structure and reactions of light and medium-mass nuclei including electroweak processes. In this contribution the current status of the chiral nuclear forces and current operators will be briefly discussed. A special role played by the calculations of nucleon-deuteron scattering will be explained.

scholarly journals Status of Theory and Experiment in Hadronic Parity Violation

2016 ◽  
Vol 40 ◽  
pp. 1660002 ◽  
Author(s):  
W. M. Snow ◽  
M. W. Ahmed ◽  
J. D. Bowman ◽  
C. Crawford ◽  
N. Fomin ◽  
...  
Keyword(s):  
Parity Violation ◽  
Nuclear Physics ◽  
Bound States ◽  
Weak Interactions ◽  
Low Energy ◽  
Current Status ◽  
Theoretical Methods ◽  
Low Energy Nuclear Physics ◽  
Theory And Experiment ◽  
Future Plans

Hadronic parity violation uses quark-quark weak interactions to probe nonperturbative strong interaction dynamics through two nonperturbative QCD scales: [Formula: see text] and the fine-tuned MeV scales of NN bound states in low energy nuclear physics. The current and projected availability of high-intensity neutron and photon sources coupled with ongoing experiments and continuing developments in theoretical methods provide the opportunity to greatly expand our understanding of hadronic parity violation in few-nucleon systems. The current status of these efforts and future plans are discussed.

scholarly journals A Fast Universal Kinematic Fitting Code for Low-Energy Nuclear Physics: FUNKI_FIT

Physics ◽  
2019 ◽  
Vol 1 (3) ◽  
pp. 375-391 ◽  
Author(s):  
Robin Smith ◽  
Jack Bishop
Keyword(s):  
Charged Particle ◽  
Particle Physics ◽  
Nuclear Physics ◽  
High Energy ◽  
Low Energy ◽  
High Energy Particle ◽  
Monte Carlo Data ◽  
Standard Data ◽  
Strip Detectors ◽  
Low Energy Nuclear Physics

We present an open-source kinematic fitting routine designed for low-energy nuclear physics applications. Although kinematic fitting is commonly used in high-energy particle physics, it is rarely used in low-energy nuclear physics, despite its effectiveness. A FORTRAN and ROOT C++ version of the FUNKI_FIT kinematic fitting code have been developed and published open access. The FUNKI_FIT code is universal in the sense that the constraint equations can be easily modified to suit different experimental set-ups and reactions. Two case studies for the use of this code, utilising experimental and Monte–Carlo data, are presented: (1) charged-particle spectroscopy using silicon-strip detectors; (2) charged-particle spectroscopy using active target detectors. The kinematic fitting routine provides an improvement in resolution in both cases, demonstrating, for the first time, the applicability of kinematic fitting across a range of nuclear physics applications. The ROOT macro has been developed in order to easily apply this technique in standard data analysis routines used by the nuclear physics community.

scholarly journals Power counting and Wilsonian renormalization in nuclear effective field theory

2016 ◽  
Vol 25 (05) ◽  
pp. 1641007 ◽  
Author(s):  
Manuel Pavón Valderrama
Keyword(s):  
Field Theory ◽  
Effective Field Theories ◽  
Effective Field Theory ◽  
Nuclear Physics ◽  
High Energy ◽  
Effective Field ◽  
Power Counting ◽  
Low Energy ◽  
Field Theories ◽  
Nuclear Forces

Effective field theories are the most general tool for the description of low energy phenomena. They are universal and systematic: they can be formulated for any low energy systems we can think of and offer a clear guide on how to calculate predictions with reliable error estimates, a feature that is called power counting. These properties can be easily understood in Wilsonian renormalization, in which effective field theories are the low energy renormalization group evolution of a more fundamental — perhaps unknown or unsolvable — high energy theory. In nuclear physics they provide the possibility of a theoretically sound derivation of nuclear forces without having to solve quantum chromodynamics explicitly. However there is the problem of how to organize calculations within nuclear effective field theory: the traditional knowledge about power counting is perturbative but nuclear physics is not. Yet power counting can be derived in Wilsonian renormalization and there is already a fairly good understanding of how to apply these ideas to non-perturbative phenomena and in particular to nuclear physics. Here we review a few of these ideas, explain power counting in two-nucleon scattering and reactions with external probes and hint at how to extend the present analysis beyond the two-body problem.

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