PROBING THE WEAKLY-BOUND NEUTRON ORBIT OF 31Ne WITH ONE-NEUTRON REMOVAL REACTIONS

2010 ◽  
Vol 25 (21n23) ◽  
pp. 1882-1885 ◽  
Author(s):  
P. CAPEL ◽  
W. HORIUCHI ◽  
Y. SUZUKI ◽  
D. BAYE
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Halo Nucleus ◽  
Strong Dependence ◽  
Valence Neutron ◽  
Neutron Halo ◽  
Weakly Bound ◽  
Single Neutron ◽  
Pf Shell ◽  
The One

A candidate of a neutron-halo nucleus, 31 Ne , contains a single neutron in the pf shell. Within Glauber and eikonal models, we analyze reactions used to study 31 Ne . We show in a 30 Ne + n model that the magnitudes of the total reaction and above all of the one-neutron removal cross sections of 31 Ne on 12 C and 208 Pb targets strongly depend on the orbital angular momentum of the valence neutron, thereby providing efficient ways to determine the structure of 31 Ne ground state. We also show that elastic-breakup observables exhibit a strong dependence upon the orbital of the valence neutron.

scholarly journals Impact of uncertainties of unbound 10Li on the ground state of two-neutron halo 11Li

2020 ◽  
Author(s):  
Jagit Singh ◽  
Wataru Horiuchi
Keyword(s):  
Ground State ◽  
Halo Nucleus ◽  
Transfer Reaction ◽  
Neutron Halo ◽  
Structure Model ◽  
Continuum States ◽  
Normal Core ◽  
Configuration Mixing ◽  
Three Body ◽  
Neutron Transfer Reaction

Recently, the energy spectrum of \boldsymbol{^{10}}10Li was measured upto \boldsymbol{4.6}4.6 MeV, via one-neutron transfer reaction \boldsymbol{d(^{9}\textrm{Li},~p)^{10}\textrm{Li}}𝐝(9Li,𝐩)10Li. Considering the ambiguities on the \boldsymbol{^{10}}10Li continuum spectrum with reference to new data, we report the configuration mixing in the ground state of the two-neutron halo nucleus \boldsymbol{^{11}}11Li for two different choices of the \boldsymbol{^{9}{\textrm{Li}}+n}9Li+𝐧 potential. For the present study, we employ a three-body (\boldsymbol{\textrm{core}+n+n}core+𝐧+𝐧) structure model developed for describing the two-neutron halo system by explicit coupling of unbound continuum states of the subsystem (\boldsymbol{\textrm{core}+n}core+𝐧), and discuss the two-neutron correlations in the ground state of \boldsymbol{^{11}}11Li.

Excitation of the 21S and 23S states of helium atoms by electron and hydrogen atom impact

1977 ◽  
Vol 55 (5) ◽  
pp. 396-402 ◽  
Author(s):  
Madeleine M. Felden ◽  
Marceau A. Felden
Keyword(s):  
Hydrogen Atom ◽  
Cross Sections ◽  
Ground State ◽  
Wave Functions ◽  
The Other ◽  
Helium Atoms ◽  
Atomic Wave ◽  
Excitation Cross Sections ◽  
The One ◽  
S States

Ochkur's approximation is used to analyse the excitation of 21S and 23S levels of helium atoms from the ground state by electron and hydrogen atom impact. Calculations are made with different atomic wave functions. To characterize the 11S and 21S states we use, on the one hand, the wave functions of Byron and Joachain, on the other hand, those of Hylleraas and Marriott and Seaton. For the 11S and 23S states, calculations are made firstly with the wave functions of Byron and Joachain and Morse, Young, and Haurwitz, secondly with those of Shull and Lödwin. Numerical values are tabulated and compared in each case. The discrepancies show the importance of the choice of atomic wave functions in the calculation of the excitation cross sections. Available experimental data and corresponding theoretical values obtained from other theories are plotted and compared with the present results.

Investigation of exotic states of 13C at low energy

2018 ◽  
Vol 27 (03) ◽  
pp. 1850025 ◽  
Author(s):  
N. Burtebayev ◽  
D. M. Janseitov ◽  
Zh. Kerimkulov ◽  
Y. S. Mukhamejanov ◽  
M. Nassurlla ◽  
...  
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Differential Cross ◽  
Ground State ◽  
Low Energy ◽  
Neutron Halo ◽  
Differential Cross Sections ◽  
Hoyle State ◽  
Exotic States ◽  
Diffraction Model

The differential cross-sections of the elastic and inelastic [Formula: see text]C scattering have been measured at E[Formula: see text][Formula: see text]MeV. The radii of the exited states: 3.09 [Formula: see text] and 8.86 [Formula: see text] MeV were determined using the Modified Diffraction Model. The radii of these excited states are larger than that of the ground state of [Formula: see text]C, confirming the suggestion that the 8.86 [Formula: see text] MeV state could be an analog of the Hoyle state in [Formula: see text]C and the 3.09 [Formula: see text] MeV state has a neutron halo. The possibility of coexistence of various exotic states in the structure of the [Formula: see text]C nucleus is shown.

TWO-BODY CORRELATION CONTRIBUTIONS IN HALO NUCLEI WITH A RELATIVISTIC HARTREE APPROACH

2004 ◽  
Vol 19 (07) ◽  
pp. 533-541
Author(s):  
W. Z. JIANG ◽  
Z. Y. ZHU ◽  
W. Q. SHEN ◽  
X. J. QIU ◽  
Z. Z. REN
Keyword(s):  
Root Mean Square ◽  
Halo Nucleus ◽  
Halo Nuclei ◽  
Neutron Halo ◽  
Mean Square ◽  
Density Dependent ◽  
The One ◽  
Body Correlation

The relativistic density-dependent Hartree framework, where the relativistic two-body correlations are properly incorporated, is developed to study the properties of halo nuclei. The halo nucleon–meson vertex is reconstructed considering the nuclear potentials can be built dominantly from the two-body interactions. The two-neutron halo nucleus 11 Li , together with the one-neutron halo nucleus 19 C , is investigated. Separation energies, root-mean-square (rms) radii, and halo tails of above halo nuclei are nicely reproduced. The correlation contribution which provides essential attractions for halo neutrons is important to guarantee the relation Sn>S2n for 11 Li .

scholarly journals Low energy reactions of halo nuclei

2021 ◽  
Vol 252 ◽  
pp. 04003
Author(s):  
Ismael Martel
Keyword(s):  
Coulomb Barrier ◽  
Reaction Mechanisms ◽  
Halo Nucleus ◽  
Low Energy ◽  
Halo Nuclei ◽  
Direct Reaction ◽  
Neutron Halo ◽  
Weakly Bound ◽  
The Core ◽  
Nuclear Core

Halo nuclei are extreme nuclear states consisting of one or more weakly-bound valence nucleons spatially decoupled from a tightly bound nuclear core. The weakly bound nature of the halo dominates the reaction probability, but the specific reaction mechanisms depend also on the core and target nuclei. Despite of the inherent complexity of the reaction process, simple two-body models and direct reaction theories can be used to extract useful information of the structure of the halo nucleus and its dynamics. These ideas are discussed using selected experiments of Coulomb barrier reactions with one- and two- neutron halo systems.

scholarly journals Neutron Halos in Excited States of 12B

KnE Energy ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 83
Author(s):  
A Danilov ◽  
A Demyanova ◽  
A Ogloblin ◽  
T Belyaeva ◽  
S Goncharov ◽  
...  
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Valence Neutron ◽  
Unexpected Result ◽  
Neutron Halo ◽  
Asymptotic Normalization ◽  
Rotational Bands ◽  
Decay Threshold ◽  
The University ◽  
Scattering Chamber

An experiment was done to search for states with a neutron halo in 12B. The measurements were carried out at the cyclotron of the University of Jyvaskyla (Finland) using Large Scattering Chamber (LSC). The idea of the work was to search for two states with the expected neutron halo, 1 ̄ and 2 ̄. Differential cross sections with excitation of 12B states, including abovementioned states, were observed. The preliminary calculations on halo radii by the method of asymptotic normalization coefficients for the 2 ̄ and 1 ̄ states which are in a discrete spectrum gave following values: 5.6 fm and 7.4 fm, which is much larger than the radius of the valence neutron in the ground state. But strictly the presence of a neutron halo can be confirmed only for 1 ̄ state. The 2 ̄ state can be considered only as candidate for halo. An unexpected result was obtained for the 3 ̄, 3.39 MeV state, which is in continuum 19 keV above the decay threshold 12B → 11B + n, preliminary estimation for its halo radius is ∼ 6.5 fm. This indicates that the halo can be present in this state as well. But strict conditions for neutron halo are not fulfilled in the same way as for 2 ̄ state. Until now, the neutron halo in unbound states has been observed only for the members of the rotational bands.

scholarly journals Double Photoionization of Endohedrally Confined Atoms

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
F. D. Colavecchia ◽  
G. Gasaneo ◽  
D. Mitnik
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Strong Dependence ◽  
Initial State ◽  
Final State ◽  
Double Photoionization ◽  
Angular Momenta ◽  
Square Well ◽  
Well Depth

We study the double electronic emission by photon impact from ground state of two-electron atoms in the center of a model spherical fullerene, which is described by a square-well shell. Cross-sections for different well depth are computed within a separable model for the final state, and a configuration interaction state for the initial one. Triple differential cross-sections show a strong dependence on the well depth and on the energy of the emitted electrons, due to the delocalization of the electrons in the initial state. The fullerene potential also allows higher angular momenta partial waves to be included in the process, which modifies the well-known two-lobe cross-section from isolated atom.

scholarly journals Coulomb excitation of the one-neutron halo nucleus 11Be

1997 ◽  
Vol 56 (1) ◽  
pp. R1-R4 ◽  
Author(s):  
M. Fauerbach ◽  
M. Chromik ◽  
T. Glasmacher ◽  
P. Hansen ◽  
R. Ibbotson ◽  
...  
Keyword(s):  
Halo Nucleus ◽  
Coulomb Excitation ◽  
Neutron Halo ◽  
The One

EXOTIC CARBON SYSTEMS IN TWO-NEUTRON HALO THREE-BODY MODELS

2011 ◽  
Vol 20 (supp01) ◽  
pp. 254-262
Author(s):  
LAURO TOMIO ◽  
ANTONIO DELFINO ◽  
TOBIAS FREDERICO ◽  
M. R. HADIZADEH ◽  
M. T. YAMASHITA ◽  
...  
Keyword(s):  
Halo Nucleus ◽  
Scaling Function ◽  
Neutron Halo ◽  
Mass Ratio ◽  
Weakly Bound ◽  
Universal Scaling ◽  
Body Model ◽  
Zero Range ◽  
Three Body ◽  
Universal Scaling Function

The general properties of exotic carbon systems, considered as a core with a two-neutron (n - n) halo, are described within a renormalized zero-range three-body model. In particular, it is addressed the cases with a core of 18C and 20C. In such a three-body framework, 20C has a bound subsystem (19C), whereas 22C has a Borromean structure with all subsystems unbound. 22C is also known as the heaviest carbon halo nucleus discovered. The spatial distributions of such weakly-bound three-body systems are studied in terms of a universal scaling function, which depends on the mass ratio of the particles, as well as on the nature of the subsystems.

scholarly journals Method for assessment of matching of total ankle joint endoprostheses based on CT data

2020 ◽  
Vol 6 (3) ◽  
pp. 396-397
Author(s):  
Heiner Martin ◽  
Josephine Wittmüß ◽  
Thomas Mittlmeier ◽  
Niels Grabow
Keyword(s):  
Cross Sections ◽  
Spline Functions ◽  
Moments Of Inertia ◽  
Cad System ◽  
Principal Moments Of Inertia ◽  
Principal Axes ◽  
Ct Data ◽  
The One ◽  
Relative Differences ◽  
Systemic Design

AbstractThe investigation of matching of endoprosthesis tibial components to the bone cross section is of interest for the manufacturer as well as for the surgeon. On the one hand, a systemic design of the prosthesis and the assortment is possible, on the other hand, a better matching implantation is enabled on the basis of experience of this study. CT sections were segmented manually using a CAD system and fitted by spline functions, then superseded with cross sections of the tibial component of a modified Hintermann H3 prosthesis. The principal moments of inertia, the direction of the principal axes and the area of the section were evaluated. Based on the relative differences of the principal moments of inertia, recommendations for application of the different prosthesis size and its selection with the surgery can be made.

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