NEUTRON REACTIONS OF LIGHT NUCLEI FROM ASTROPHYSICS & NUCLEAR PHYSICS INTEREST

2002 ◽  
Author(s):  
Y. NAGAI ◽  
T. SHIMA ◽  
A. TOMYO ◽  
H. MAKII ◽  
K. MISHIMA ◽  
...  
Keyword(s):  
Nuclear Physics ◽  
Light Nuclei ◽  
Neutron Reactions

scholarly journals Laser-assisted proton collision on light nuclei at moderate energies

2015 ◽  
Vol 33 (2) ◽  
pp. 299-305 ◽  
Author(s):  
I.F. Barna ◽  
S. Varró
Keyword(s):  
Cross Sections ◽  
Nuclear Physics ◽  
Optical Potential ◽  
Laboratory Frame ◽  
Light Nuclei ◽  
Photon Absorption ◽  
Quantum Mechanical ◽  
Proton Collision ◽  
X Ray ◽  
Low Energy Nuclear Physics

AbstractWe present a non-relativistic analytic quantum mechanical model to calculate angular differential cross-sections for laser-assisted proton nucleon scattering on a Woods–Saxon optical potential where the nth-order photon absorption is taken into account simultaneously. With this novel description we can integrate two well-established fields, namely low-energy nuclear physics and multi-photon processes together. As a physical example we calculate cross-sections for proton–12C collision at 49 MeV in the laboratory frame in various realistic laser fields. We consider optical Ti:sapphire and X-ray lasers with intensities which are available in existing laser facilities or in the future ELI or X-FEL.

scholarly journals Chiral electroweak currents in nuclei

2017 ◽  
Vol 26 (01n02) ◽  
pp. 1740022 ◽  
Author(s):  
D. O. Riska ◽  
R. Schiavilla
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Chiral Lagrangians ◽  
Nuclear Physics ◽  
Effective Field ◽  
Light Nuclei ◽  
Chiral Effective Field Theory

The development of the chiral dynamics based description of nuclear electroweak currents is reviewed. Gerald E. (Gerry) Brown’s role in basing theoretical nuclear physics on chiral Lagrangians is emphasized. Illustrative examples of the successful description of electroweak observables of light nuclei obtained from chiral effective field theory are presented.

scholarly journals Short range nucleon correlations studied with electron and photon probes

2020 ◽  
Author(s):  
Ian MacGregor
Keyword(s):  
Nuclear Physics ◽  
Short Range ◽  
Nucleon Nucleon ◽  
Light Nuclei ◽  
Nucleon Emission ◽  
Group A ◽  
Three Body ◽  
The University ◽  
Electron And Photon

This paper reviews experimental research into two- and three-body nucleon-nucleon interactions, carried out by the University of Glasgow Nuclear Physics research group. A key aim of these studies has been to elucidate the role of short-range nucleon-nucleon correlations (SRC). Studies of photon-induced two- and three-nucleon emission reactions from a range of light nuclei, carried out at the 840 MeV Mainz electron microtron MAMI-B, have provided detailed information on the contributing mechanisms. More recent electron scattering studies at the 6.0 GeV Jefferson Laboratory have probed SRC at high values of Q^{2}2 and x_{B}B and suggested a connection between SRC and the EMC effect.

scholarly journals The structure of light nuclei and its effect on precise atomicmeasurements

2002 ◽  
Vol 80 (11) ◽  
pp. 1337-1346 ◽  
Author(s):  
J L Friar
Keyword(s):  
Atomic Physics ◽  
Nuclear Physics ◽  
Recent Progress ◽  
Nuclear Force ◽  
Light Nuclei ◽  
Experimental Status

The paper consists of three parts: (i) what every atomic physicist needs to know about the physics of light nuclei (and no more); (ii) what nuclear physicists can do for atomic physics; and (iii) what atomic physicists can do for nuclear physics. A brief qualitative overview of the nuclear force and calculational techniques for light nuclei will be presented, with an emphasis on debunking myths and on recent progress in the field. Nuclear quantities that affect precise atomic measurements will be discussed, together with their current theoretical and experimental status. The final topic will be a discussion of those atomic measurements that would be useful to nuclear physics. PACS No.: 31.30Gs

scholarly journals Quantum Monte Carlo Methods in Nuclear Physics: Recent Advances

2019 ◽  
Vol 69 (1) ◽  
pp. 279-305 ◽  
Author(s):  
J.E. Lynn ◽  
I. Tews ◽  
S. Gandolfi ◽  
A. Lovato
Keyword(s):  
Monte Carlo ◽  
Quantum Monte Carlo ◽  
Nuclear Physics ◽  
Degrees Of Freedom ◽  
Effective Field ◽  
Binding Energies ◽  
Neutron Matter ◽  
Light Nuclei ◽  
Medium Mass ◽  
Recent Developments

In recent years, the combination of precise quantum Monte Carlo (QMC) methods with realistic nuclear interactions and consistent electroweak currents, in particular those constructed within effective field theories (EFTs), has led to new insights in light and medium-mass nuclei, neutron matter, and electroweak reactions. For example, with the same chiral interactions, QMC calculations can reproduce binding energies and radii for light nuclei, n–α scattering phase shifts, and the neutron matter equation of state. This compelling new body of work has been made possible both by advances in QMC methods for nuclear physics, which push the bounds of applicability to heavier nuclei and to asymmetric nuclear matter, and by the development of local chiral EFT interactions up to next-to-next-to-leading order and minimally nonlocal interactions including Δ degrees of freedom. In this review, we discuss these recent developments and give an overview of the exciting results for nuclei, neutron matter and neutron stars, and electroweak reactions.

scholarly journals The α-decay of the Hoyle state in 12C: a new high-precision investigation

2018 ◽  
Vol 184 ◽  
pp. 01005 ◽  
Author(s):  
D. Dell‘Aquila ◽  
I. Lombardo ◽  
G. Verde ◽  
M. Vigilante ◽  
L. Acosta ◽  
...  
Keyword(s):  
Nuclear Physics ◽  
Reaction Rate ◽  
Previous Experiment ◽  
Light Nuclei ◽  
Hoyle State ◽  
Α Decay ◽  
Total Absence ◽  
Decay Component ◽  
Direct Decay ◽  
Bose Einstein

The αdecay path of the Hoyle state in 12C (Ex = 7:654MeV) represents one ofthe most challenging questions of modern nuclear physics. Its knowledge can help in theunderstanding of cluster configurations in light nuclei and the possible existence of Bose-Einstein condensates in nuclei. In stars, it is involved in the so-called 3αprocess, wherethe 12C nucleosynthesis occurs. We studied the 14N(d; α2)12C(7:654) reaction at 10:5MeVincident energy to probe its direct decay component. We found, with a precision higherof a factor 5 than any other previous experiment, an almost total absence of direct decaysby-passing the ground state of 8Be. From our analysis, a new upper limit of such decayis found at 0:043% (95% C.L.). Astrophysical 3α process reaction rate calculations haveto be accordingly revised.

scholarly journals The collision of α-particles with atomic nuclei

1932 ◽  
Vol 137 (832) ◽  
pp. 447-463 ◽  
Keyword(s):  
Nuclear Physics ◽  
Light Nuclei ◽  
Nuclear Potential ◽  
Experimental Investigations ◽  
Virtual Level ◽  
Potential Barriers ◽  
Atomic Nuclei ◽  
Particle Exchange ◽  
Usual Theory ◽  
Α Particles

Since the introduction of the concept of nuclear potential barriers by Gurney and Condon and by Gamow a great deal of attention has been concentrated on the behaviour of such systems. As a consequence of this there has been a considerable increase of knowledge of nuclear phenomena, particularly in so far as these are concerned with α-particles. As a great proportion of experimental investigations in nuclear physics are concerned with the observation of effects due to impacts of α-particles on nuclei, the theoretical investigation of such collisions is of great interest. In this connection difficulties arise owing to the strong perturbation of the α-particle wave by the nuclear potential barrier. This renders the ordinary theory of collisions, due to Born, inapplicable and this failure of the usual theory was not realised for some time. A more suitable theory has never been developed explicitly, though formulæ which one would expect to derive from such a theory have been used. In this paper a suitable theory is developed. Besides establishing the validity of the above formulæ, this theory is also applied to the consideration of the probability of α-particle exchange on impact and to the elastic scattering by light nuclei (Mg, Al, etc.). It is shown that α-particle exchange is of considerable importance when the energy of the incident α-particle coincides with that of a virtual level of the nucleus and will have the effect of broadening the level.

scholarly journals Fusion: a true challenge for an enormous reward

2018 ◽  
Vol 189 ◽  
pp. 00015
Author(s):  
J. Ongena
Keyword(s):  
Nuclear Physics ◽  
New Technology ◽  
Light Nuclei ◽  
Heavy Nuclei ◽  
Fusion Reactions ◽  
Minimal Impact ◽  
Daily Experience ◽  
Energy Needs ◽  
Term Energy ◽  
Minimal Environmental Impact

Nuclear physics shows that energy can be released from both fission of heavy nuclei and fusion of light nuclei. Steady progress shows that fusion — an important additional option for energy production in the future — promises to be a clean and safe solution for mankind’s long-term energy needs with minimal environmental impact. A source of energy which would be inexhaustible, inherently safe and environmentally friendly, is this not a marvellous prospect? Nuclear fusion, a possible candidate for this role, has been the energy source of our Sun and the stars in the universe for billions of years. This process requires temperatures of tens of millions of degrees, so extremely high and foreign to our daily experience that it seems out of reach. Nevertheless, these extremely high temperatures are routinely realised in several laboratories all over the world, and since the early 1990s, tens of MW fusion power have been released from fusion reactions. We are witnessing the birth of a new technology destined to meet the gigantic future energy needs of mankind with minimal impact on the environment.

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