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842 results on '"Halo nucleus"'

1. Study of bound and resonance states of 11Be in breakup reaction

Author

D.S. Valiolda, D.M. Janseitov, and V.S. Melezhik

Subjects
halo nucleus, energy spectrum, coulomb breakup, breakup cross section, low-lying resonanse, Physics, QC1-999
Abstract

We investigate the Coulomb breakup of the 11 Be halo nuclei on a lead target within non-perturbative time-dependent approach in a wide range of beam energy (5–70 MeV/nucleon) including the low-lying resonances in different partial and spin states of 11 Be. We have found considerable contribution of the low-lying resonances ( 5/2+ , 3/2− and 3/2+ ) to the breakup cross section of 11 Be. The obtained results are in good agreement with existing experimental data at 69 MeV/nucleon. The developed computational scheme opens new possibilities in investigation of Coulomb, as well as nuclear, breakup of other halo nuclei on heavy, as well as, light targets.

Published
2022
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2. СТРУКТУРА НИЗКОЛЕЖАЩИХ СОСТОЯНИЙ ЯДРА 9Вe

Author

Жусупов, М. А., Жаксыбекова, К. А., Кабатаева, Р. С., and урсынбаева, Д. А. Т

Abstract

Glauber's theory of multiple scattering is applied to the calculation of differential cross sections and polarization characteristics of particle scattering on light nuclei. All calculations were carried out within the framework of a reliable spectroscopic approach to nuclear reactions. Its essence consists in the use of nuclear models that reproduce practically all the spectroscopic characteristics of the nuclei under consideration. These include three-particle models of 6Li and 9Be nuclei, a many-particle shell model for nuclei with А = 6-14, and a particle-hole model of shells for nuclei with А = 15; three-body models for the 8Li and 9Li nuclei and a twoparticle αt-model for the 7Li nucleus. As our experience shows, when implementing the spectroscopic approach, when the dominant mechanism of the process is also established, one can not only obtain a description of the main characteristics of the process, but also rely on the predictive nature of the theory. In the present work, the results obtained are supplemented by calculations of the structure of the lowlying 5/2+ and 5/2- levels. This allows us to draw a general conclusion: the negative parity levels in 9Be, in which the valence neutron is in the p state, do not have a halo structure; at the same time, low-lying levels of positive parity, in which the valence neutron passes into the next (2s-1d) shell, have such. A special place is occupied by our recent direct evidence of the halo structure of low-lying excited states of the 9Be nucleus with quantum numbers 1/2+ and 3/2+. Within the framework of the ααn model of the 9Be nucleus, it was shown that a valence neutron with a high probability is located at 11 fm from the center of gravity of two α-particles, while in the 3/2 ground state this distance is several times smaller. The conclusions about the structure of low-lying levels of 9Be, obtained on the basis of the ααn model, are supported by calculations of p9Be scattering: only taking into account the halo structure makes it possible to reproduce the experimental data on inelastic scattering to positive parity levels. [ABSTRACT FROM AUTHOR]

Published
2023
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4. Possible 1- and 2-Neutron Halo Emission from Super-heavy Elements via Cluster Radioactivity.

Author

Prathapan, K., Anjali, K. P., and Biju, R. K.

Abstract

Theoretical study on the emission of 1-n and 2-n halo nuclei from parents with Z = 121–126 is performed using the Coulomb and proximity potential as the interacting barrier. The barrier penetrability and decay half-lives were calculated based on Q values estimated from the tables of KTUY. The decay-half lives of 11Be, 15Ca, 23O, and 24F are found to be less than the experimental upper limit of 1010 s. We have identified 15C as the most probable halo nucleus to emit from the selected parent isotopes. A comparison of half-lives of decay is made by considering the emitted halo as a spherical cluster and as a deformed nucleus with an rms radius. The neutron shell closure at neutron numbers 162, 164, 178, 180, 182, and 184 is revealed from the plot of log 10 T 1 / 2 against the neutron number of the daughter nuclei. The comparison of SF and alpha-decay half-lives showed that many of the parents are stable against SF. The linearity of Geiger–Nuttall plots ( log 10 T 1 / 2 verses Q - 1 / 2 and log 10 T 1 / 2 verses - ln P ) shows that the Geiger–Nuttall law can be applied to the decay of halo nuclei. [ABSTRACT FROM AUTHOR]

Published
2021
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5. Towards a consistent understanding of the exotic nucleus 1442Si28.

Author

Abbas, Syed Afsar, Usmani, Anisul Ain, Rahaman, Usuf, and Ikram, M.

Subjects
EXOTIC nuclei, MAGIC number (Nuclear physics), NUCLEAR fusion, QUANTUM chromodynamics, NUCLEAR density
Abstract

The issue of magicity of 1442Si28 has been a contentious one. Fridmann et al., through studies of two-proton knockout reaction 1644S28 → 1442Si28, presented strong evidence in support of magicity and sphericity of 1442Si28. However in complete conflict with this, Bastin et al., gave equally strong empirical evidence, to show that the N = 28 magicity had completely collapsed in 1442Si28 to make it well deformed. The consensus at present though is in favour of the validity of the latter experiment. However, our QCD based theoretical model supports the result of Fridmann experiment. They had explored the amazing persistence of the unique exotic nucleus 1442Si28 as a stable structure within the nucleus 2048Ca28; even after stripping off six-protons through the isotonic chain: 2048Ca28 → 1846Ar28 → 1644S28 → 1442Si28. Thus it is the novel and unexpected stability of proton shell closure at Z=14 in 1442Si28, which is playing such a dominant role in ensuring its magicity, while the neutron magic number N = 28, goes into hiding or actually disappears. Recently, SAA has shown that the fusion experiment of a beam of halo nucleus 6He with the target nucleus 238U, actually provided strong evidence that the "core" of the halo nucleus has the structure of a tennis-ball (bubble) like nucleus, with a "hole" at the centre of its density distribution. This provides us with clear-cut support for our Quantum Chromodynamics based model of clusters of tritons in neutron-rich nuclei. Here we show that our QCD based model, provides support to Fridmann et al., showing that, 1442Si28 has a spherically magic structure of 14 1³H2 (14-tritons) with a tennis-ball (bubble) like structure with "hidden" N=28 neutrons. [ABSTRACT FROM AUTHOR]

Published
2020

7. Trends and Future Developments of Nuclear Reactions

Author

Paetz gen. Schieck, Hans, Beiglböck, Wolf, Series editor, Ehlers, Jürgen, Series editor, Englert, Berthold-Georg, Series editor, Frisch, Uriel, Series editor, Hänggi, Peter, Series editor, Hillebrandt, Wolfgang, Series editor, Jones, Richard A L, Series editor, von Löhneysen, H., Series editor, Raimond, Jean-Michel, Series editor, Salmhofer, Manfred, Series editor, Sornette, Didier, Series editor, Theisen, Stefan, Series editor, Vollhardt, Dieter, Series editor, Weise, Wolfram, Series editor, Longair, Malcolm S., Series editor, Rubio, Angel, Series editor, Hjorth-Jensen, Morten, Series editor, Pinton, Jean-Francois, Series editor, Wells, James D., Series editor, and Paetz gen. Schieck, Hans

Published
2014
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8. Classical Cross Section

Author

Paetz gen. Schieck, Hans, Beiglböck, Wolf, Series editor, Ehlers, Jürgen, Series editor, Englert, Berthold-Georg, Series editor, Frisch, Uriel, Series editor, Hänggi, Peter, Series editor, Hillebrandt, Wolfgang, Series editor, Jones, Richard A L, Series editor, von Löhneysen, H., Series editor, Raimond, Jean-Michel, Series editor, Salmhofer, Manfred, Series editor, Sornette, Didier, Series editor, Theisen, Stefan, Series editor, Vollhardt, Dieter, Series editor, Weise, Wolfram, Series editor, Longair, Malcolm S., Series editor, Rubio, Angel, Series editor, Hjorth-Jensen, Morten, Series editor, Pinton, Jean-Francois, Series editor, Wells, James D., Series editor, and Paetz gen. Schieck, Hans

Published
2014
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9. Nuclear Charge Radii of Light Elements and Recent Developments in Collinear Laser Spectroscopy

Author

Nörtershäuser, Wilfried, Geppert, Christopher, Englert, Berthold-Georg, Series editor, Frisch, Uriel, Series editor, Hänggi, Peter, Series editor, Hillebrandt, Wolfgang, Series editor, Jones, Richard A L, Series editor, von Löhneysen, H., Series editor, Raimond, Jean-Michel, Series editor, Salmhofer, Manfred, Series editor, Sornette, Didier, Series editor, Theisen, Stefan, Series editor, Vollhardt, Dieter, Series editor, Weise, Wolfram, Series editor, Longair, Malcolm, Series editor, Rubio, Angel, Series editor, Hjorth-Jensen, Morten, Series editor, Pinton, Jean-Francois, Series editor, Wells, James D., Series editor, Scheidenberger, Christoph, editor, and Pfützner, Marek, editor

Published
2014
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10. Direct Reactions at Relativistic Energies: A New Insight into the Single-Particle Structure of Exotic Nuclei

Author

Cortina-Gil, Dolores, Englert, Berthold-Georg, Series editor, Frisch, Uriel, Series editor, Hänggi, Peter, Series editor, Hillebrandt, Wolfgang, Series editor, Jones, Richard A L, Series editor, von Löhneysen, H., Series editor, Raimond, Jean-Michel, Series editor, Salmhofer, Manfred, Series editor, Sornette, Didier, Series editor, Theisen, Stefan, Series editor, Vollhardt, Dieter, Series editor, Weise, Wolfram, Series editor, Longair, Malcolm, Series editor, Rubio, Angel, Series editor, Hjorth-Jensen, Morten, Series editor, Pinton, Jean-Francois, Series editor, Wells, James D., Series editor, Scheidenberger, Christoph, editor, and Pfützner, Marek, editor

Published
2014
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11. A Pedestrian Approach to the Theory of Transfer Reactions: Application to Weakly-Bound and Unbound Exotic Nuclei

Author

Gómez Camacho, Joaquín, Moro, Antonio M., Englert, Berthold-Georg, Series editor, Frisch, Uriel, Series editor, Hänggi, Peter, Series editor, Hillebrandt, Wolfgang, Series editor, Jones, Richard A L, Series editor, von Löhneysen, H., Series editor, Raimond, Jean-Michel, Series editor, Salmhofer, Manfred, Series editor, Sornette, Didier, Series editor, Theisen, Stefan, Series editor, Vollhardt, Dieter, Series editor, Weise, Wolfram, Series editor, Longair, Malcolm, Series editor, Rubio, Angel, Series editor, Hjorth-Jensen, Morten, Series editor, Pinton, Jean-Francois, Series editor, Wells, James D., Series editor, Scheidenberger, Christoph, editor, and Pfützner, Marek, editor

Published
2014
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16. Charge radius of the 13N* proton halo nucleus with Halo Effective Field Theory.

Author

Mosavi Khansari, M., Khalili, H., and Sadeghi, H.

Subjects
*HALOS (Meteorology), *PROTONS, *SHEAR waves, *FIELD theory (Physics), *SCATTERING (Physics)
Abstract

We evaluated the charge radius of the first excited state of 13 N with halo Effective Field Theory (hEFT) at the low energies. The halo effective field theory without pion is used to examine the halo nucleus bound state with a large S-wave scattering length. We built Lagrangian from the effective core and the valence proton of the fields and obtained the charge form factor at Leading–Order (LO). The charge radius at leading order for the first excited state of the proton halo nucleus, 13 N , has been estimated as r c = 2.52 fm. This result is without any finite-size contributions included from the core and the proton. If we consider the contributions of the charge radius of the proton and the core, the result will be [ r C ] 13 N * = 5.85 fm. [ABSTRACT FROM AUTHOR]

Published
2018
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17. Halo Nuclei in Laser Light

Author

Drake, G. W. F., Lu, Z.-T., Nörtershäuser, W., Yan, Z.-C., Beig, R., editor, Beiglböck, W., editor, Domcke, W., editor, Englert, B.-G., editor, Frisch, U., editor, Hänggi, P., editor, Hasinger, G., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, Löhneysen, H. v., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, and Karshenboim, Savely G., editor

Published
2008
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18. Looking Through Simple Atoms and Molecules at Fundamental Physics

Author

Karshenboim, S. G., Beig, R., editor, Beiglböck, W., editor, Domcke, W., editor, Englert, B.-G., editor, Frisch, U., editor, Hänggi, P., editor, Hasinger, G., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, Löhneysen, H. v., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, and Karshenboim, Savely G., editor

Published
2008
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22. Nuclear charge radius of 11Li

Author

Sánchez, Rodolfo, Nörtershäuser, Wilfried, Dax, Andreas, Ewald, Guido, Götte, Stefan, Kirchner, Reinhard, Kluge, H.-Jürgen, Kühl, Thomas, Wojtaszek, Agnieszka, Bushaw, Bruce A., Drake, Gordon W. F., Yan, Zong-Chao, Zimmermann, Claus, Albers, Daniel, Behr, John, Bricault, Pierre, Dilling, Jens, Dombsky, Marik, Lassen, Jens, Phil Levy, C. D., Pearson, Matthew R., Prime, Erika J., Ryjkov, Vladimir, Błaszczak, Z., editor, Markov, B., editor, and Marinova, K., editor

Published
2007
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23. Nuclear Halos and Experiments to Probe Them

Author

Riisager, K., Beig, R., editor, Beiglböck, W., editor, Domcke, W., editor, Englert, B.-G., editor, Frisch, U., editor, Hänggi, P., editor, Hasinger, G., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, Löhneysen, H. v., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, Al-Khalili, Jim, editor, and Roeckl, Ernst, editor

Published
2006
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26. Automatic Ontology Extraction from Unstructured Texts

Author

Ahmad, Khurshid, Gillam, Lee, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Meersman, Robert, editor, and Tari, Zahir, editor

Published
2005
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30. Pairing in Atomic Aggregates

Author

Broglia, Ricardo A., Colò, Gianluca, Onida, Giovanni, Roman, H. Eduardo, Broglia, Ricardo A., Colò, Gianluca, Onida, Giovanni, and Roman, H. Eduardo

Published
2004
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35. Exploring the core deformation properties of 29F halo nucleus using T- and Y-configurations

Author

K. S. Khoo, Shahidan Radiman, and Jobaidul Islam

Subjects
Physics, Jacobi coordinates, Nuclear Theory, General Physics and Astronomy, Halo nucleus, Prolate spheroid, Radius, Deformation (meteorology), 01 natural sciences, Molecular physics, 010305 fluids & plasmas, Core (optical fiber), Root mean square, medicine.anatomical_structure, 0103 physical sciences, medicine, Nuclear Experiment, 010306 general physics, Nucleus
Abstract

29F nucleus is a two-neutron halo nucleus with the core (27F) + n + n three-body system. We studied the Jacobi coordinates dependant T-and Y-configurations properties due to the core deformation of this nucleus. For this deformation of the core, the separation energy (S2n) and the root mean square (RMS) matter radius of this halo nucleus were calculated. This theoretical calculation for investigating T-and Y-configuration properties was accomplished through the MATLAB computational software. A positive core deformation was found, which indicates a prolate shaped halo nucleus. We found an excellent agreement for S2n and 96.4% and 96% accuracies for the T- and Y-configurations respectively.

Published
2021
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36. Scattering and reactions of halo nuclei

Author

Johnson, Ronald C., Beig, R., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Hillebrand, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Lipowsky, R., editor, v Löhneysen, H., editor, Ojima, I., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Arias, José M., editor, and Lozano, Manuel, editor

Published
2001
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37. Cross section and astrophysical S-factor for [formula omitted] reaction with Halo Effective Field Theory at low-energies.

Author

Khansari, M. Mosavi, Khalili, H., and Sadeghi, H.

Subjects
*GALACTIC halos, *NUCLEAR cross sections, *GALACTIC nuclei, *FIELD theory (Physics), *SCATTERING (Physics), *PROTON capture
Abstract

We considered one of the proton halo nuclei candidates, 13 N * nucleus, and calculated the cross section and astrophysical S-factor for 12 C ( p, γ ) 13 N * reaction using halo effective field theory without pion (hEFT ¬ π ). The halo effective field theory is used to examine the halo nucleus bound state with a large S-wave scattering length. We calculated the radiative proton capture cross section and the astrophysical S-factor from the fields of the core and the valence proton at the Leading-Order (LO). We showed that there is a good agreement among the our results for cross section and astrophysical S-factor of the 12 C ( p, γ ) 13 N * reaction and the experimental data. The astrophysical S-factor that has been estimated at the zero energy ( E cm =0) by using a theoretical calculation of the cross section for direct radiative capture and an extrapolation of this calculation obtained S ( 0 ) = 1.883 × 10 − 3 MeV-b. [ABSTRACT FROM AUTHOR]

Published
2017
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39. Concluding Remarks

Author

Gibson, B. F., Plessas, W., editor, Oryu, Shinsho, editor, Kamimura, Masayasu, editor, and Ishikawa, Souichi, editor

Published
2000
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40. Halo Nuclei

Author

Orr, N. A., Plessas, W., editor, Desplanques, Bertrand, editor, Protasov, Konstantin, editor, Silvestre-Brac, Bernard, editor, and Carbonell, Jaume, editor

Published
1999
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45. Relativistic mean field theory and applications in finite nuclei

Author

Ring, P., Afanasjev, A. V., Meng, J., Araki, H., editor, Brézin, E., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Pan, Xing-Wang, editor, Feng, Da Hsuan, editor, and Vallières, Michel, editor

Published
1997
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48. High spins and exotic shapes

Author

Åberg, Sven, Araki, H., editor, Brézin, E., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Arias, Jose Miguel, editor, Gallardo, María Isabel, editor, and Lozano, Manuel, editor

Published
1995
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