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1. Core excitation effects in halo nuclei using a transformed oscillator basis

Author

Joaquín Gómez-Camacho, A. M. Moro, José M. Arias, J. A. Lay, Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España), Junta de Andalucía, European Commission, Ministerio de Ciencia e Innovación (España), Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and Ministerio de Ciencia e Innovación (MICIN). España

Subjects
Physics, Photon, Breakup, Nuclear Theory, Coulomb excitation, Core excitation, Dipole, Quadrupole, Halo nuclei, Coulomb, Halo, Nuclear reactions, Atomic physics, Nuclear Experiment, Nucleon, Harmonic oscillator
Abstract

Trabajo presentado al "International Scientific Meeting on Nuclear Physics: Basic concepts in nuclear physics: Theory, experiments and applications" celebrado en La Rábida (España) del 9 al 13 de septiembre de 2012., A recent generalization of the Transformed Harmonic Oscillator basis, intended to consider core excitations in the structure of one nucleon halo nuclei, is applied to the break up of 11Be. The reaction studied is 11Be+208Pb at 69 MeV/nucleon. The experimental set up is designed to ensure pure dipole Coulomb excitations. Making use of the Equivalent Photon Method and the electromagnetic transition probabilities obtained with the transformed oscillator basis, a relevant contribution of the quadrupole excitations of the core is found. The inclusion of core excitations is, therefore, necessary for the correct extraction of the dipole electromagnetic transition probability of halo nuclei., This work has been partially supported by the Spanish Ministerio de Ciencia e Innovación and FEDER funds under Projects No. FIS2011-28738-c02-01, No. FPA2009-07653, and No. FPA2009-08848, by the Spanish Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042), and by Junta de Andalucía (FQM160, P07-FQM-02894). J.A.L. acknowledges a research grant by the Ministerio de Ciencia e Innovación.

Published
2013

2. Scattering of 8He on 208Pb at 22 MeV

Author

Marquínez-Durán, G., Sánchez-Benítez, A. M., Martel, Ismael, Acosta, Luis, Álvarez, M. A. G., García Borge, María José, Cruz, C., Cubero, M., Fernández García, J. P., Fernández-Martínez, B., Gómez-Camacho, Joaquín, Labrador, J. A., Moro, A. M., Tengblad, Olof, and Abou-Haidar, Ziad

Abstract

Trabajo presentado al "International Scientific Meeting on Nuclear Physics: Basic concepts in nuclear physics: Theory, experiments and applications" celebrado en La Rábida (España) del 9 al 13 de septiembre de 2012.-- et al. The skin nucleus 8 He is investigated by measuring the angular distribution of the elasticly scattered 8 He and the 6,4 He fragments produced in the collision with a 208 Pb target at 22 MeV, just above the Coulomb barrier. The experiment was carried out at SPIRAL/GANIL in 2010. Here we present preliminary results for the elastic scattering.

Published
2013

3. Scattering of 8He on 208Pb at 22 MeV

Author

Marquínez Durán, G., Sánchez Benítez, A. M., Martel, I., Acosta, Luis, Rusek, K., González Álvarez, Marcos Aurelio, Berjillos, R., Borge, M. J. G., Chbihi, Abdelahad, Cruz, C., Fernández García, Juan Pablo, Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Fernández Martínez, Begoña, and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Direct reactions, 8He, Elastic scattering, Nuclear Experiment
Abstract

The skin nucleus 8He is investigated by measuring the angular distribution of the elasticly scattered 8He and the 6,4He fragments produced in the collision with a 208Pb target at 22 MeV, just above the Coulomb barrier. The experiment was carried out at SPIRAL/GANIL in 2010. Here we present preliminary results for the elastic scattering.

Published
2013

4. Core excitation effects in the breakup of halo nuclei

Author

R. Crespo, José M. Arias, A. M. Moro, R. C. Johnson, J. A. Lay, R. de Diego, Joaquín Gómez-Camacho, and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Physics, Nuclear reaction, Breakup, Nuclear Theory, Nuclear structure, Core excitation, Nuclear physics, Recoil, Excited state, Halo nuclei, Halo, Nuclear reactions, Atomic physics, Nucleon, Nuclear Experiment, Excitation
Abstract

The role of core excitation in the structure and dynamics of two-body halo nuclei is investigated. We present calculations for the resonant breakup of 11Be on protons at an incident energy of 63.7 MeV/nucleon, where core excitation effects were shown to be important. To describe the reaction, we use a recently developed extension of the DWBA formalism which incorporates these core excitation effects within the no-recoil approximation. The validity of the no-recoil approximation is also examined by comparing with DWBA calculations which take into account core recoil. In addition, calculations with two different continuum representations are presented and compared. Ministerio de Ciencia e Innovación FIS2011-28738-c02-01, FPA2009- 07653, FPA2009-08848, CSD2007-00042 Junta de Andalucía FQM160, P07-FQM-02894

Published
2012

5. Stabilization method in two-body systems with core excitations

Author

J. A. Lay, A. M. Moro, Joaquín Gómez-Camacho, José M. Arias, and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Stabilization methods, Valence (chemistry), Continuum discretization, Excited state, Quantum mechanics, Resonances, Atomic physics, Ground state, Harmonic oscillator, Exotic nuclei, Mathematics
Abstract

The validity of the stabilization method in core+valence systems including the possibility of exciting the core is studied. A pseudostate method, based on the transformed harmonic oscillator basis, is extended to include the core degrees of freedom. The method is applied to the case of 11Be structure considering the 0+ ground state and the 2+ first excited state of the 10Be core. The stabilization method is defined in terms of one parameter that can be chosen either discrete or continuous. In the application to 11Be, both cases are analyzed. Ministerio de Ciencia e Innovación FIS2011-28738-c02-01, FPA2009-07653, FPA2009-08848, CSD2007-00042 Junta de Andalucía FQM160, P07-FQM-02894

Published
2012

6. Study of the scattering of halo nuclei around the Coulomb barrier

Author

L. Acosta, M. Cubero, D. Escrig, J. P. Fernández-García, J. A. Lay, A. M. Moro, M. Rodríguez-Gallardo, A. M. Sánchez-Benítez, M. Alcorta, M. A. G. Álvarez, M. V. Andrés, C. Angulo, M. J. G. Borge, L. Buchmann, J. Cabrera, S. Cherubini, M. A. Cortés, P. Demaret, C. G. Diget, A. Di Pietro, J. M. Espino, P. Figuera, L. M. Fraile, M. Freer, B. Fulton, H. O. U. Fynbo, D. Galaviz, J. E. García-Ramos, M. E. Gómez, J. Gómez-Camacho, M. Gulino, O. R. Kakuee, M. Madurga, A. Maira-Vidal, I. Martel, C. Metelko, A. Musumarra, I. Mukha, F. Pérez-Bernal, J. Rahighi, G. Randisi, E. Reillo, J. Rodríguez-Quintero, K. Rusek, V. Scuderi, A. Shotter, D. Smirnov, O. Tengblad, P. Van Duppen, P. Walden, V. Ziman, Floyd D. McDaniel, Barney L. Doyle, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia y Tecnología (MCYT). España, and Ministerio de Educación y Ciencia (MEC). España

Subjects
Physics, Elastic scattering, Scattering, Coulomb barrier, Fermion, Neutron scattering, Nuclear physics, Halo nuclei, Neutron, Halo, Atomic physics, Nuclear Experiment, Isotopes of helium, Breakup products
Abstract

During the past ten years the present collaboration has carried out several experiments related with the study of radioactive nuclei. One of the topics in which we have centered our research, is the scattering of halo nuclei at energies around the Coulomb barrier. As part of this study, we present in this work a review of the results obtained from the scattering of 6He, 11Be and 11Li. The presence of a >halo> in these exotic nuclei is found to have a striking effect on the dynamics of these reactions, making their study an interesting experimental problem and a challenge for existing reaction theories.

Published
2011

7. Dynamic studies of 11Li and its core 9Li on 208Pb near the Coulomb barrier

Author

Cubero, M., García Borge, María José, Acosta, Luis, Alcorta, Martín, Álvarez, M. A. G., Galaviz, D., Fernández García, J. P., Gómez-Camacho, Joaquín, Lay, J. A., Madurga, Miguel, Martel, Ismael, Moro, A. M., Mukha, I., Sánchez-Benítez, A. M., and Tengblad, Olof

Abstract

Comunicación presentada al "International scientific meeting on nuclear physics: basic concepts in nuclear physics: theory, experiments and applications" celebrado del 4 al 10 de julio del 2009 en La Rábida (España).-- et al., We measured the scattering of the halo nucleus Li-11 and its core Li-9 on the lead target at TRIUMF at energies below and around to the Coulomb barrier. We report here on our preliminary analysis of the inclusive breakup reaction.

Published
2010

8. Dynamic studies of 11Li and its core 9Li on 208Pb near the Coulomb barrier

Author

Cubero, M, Borge, M. J. G., Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Diget, C., Galaviz, D., Fernández García, Juan Pablo, Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Madurga, Miguel, Moro Muñoz, Antonio Matías, Mukha, I., and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Nuclear Theory, Halo nuclei, 9Li, Breakup channel, Elastic scattering, Nuclear Experiment, 11Li
Abstract

We measured the scattering of the halo nucleus 11Li and its core 9Li on the lead target at TRIUMF at energies below and around to the Coulomb barrier. We report here on our preliminary analysis of the inclusive breakup reaction.

Published
2010

9. Elastic scattering of 6He and 7Be on a 9Be target

Author

Pires, K. C. C., Mukha, I., Moro, A. M., and Gómez-Camacho, Joaquín

Abstract

Comunicación presentada al "International scientific meeting on nuclear physics: basic concepts in nuclear physics: theory, experiments and applications" celebrado del 4 al 10 de julio del 2009 en La Rábida (España).-- RIBRAS collaboration, PH210 collaboration, et al., The elastic scattering data for the 6He+9Be and 7Be+9Be reactions, measured at Elab = 16.2 MeV and Elab = 23.7 MeV respectively, are presented and analyzed using the optical model and coupled‐channels formalisms.

Published
2010

10. Four‐body continuum‐discretized coupled‐channels calculations: Application to 6He+64Zn at 13.6 MeV

Author

Rodríguez Gallardo, Manuela, Arias, J.M., Gómez-Camacho, Joaquín, Moro, A. M., Thompson, I. J., and Tostevin, J.

Abstract

Trabajo presentado al "International scientific meeting on nuclear physics: basic concepts in nuclear physics: theory, experiments and applications" celebrado del 4 al 10 de julio del 2009 en La Rábida (España).-- El pdf del artículo es la versión post-print., The recently developed four-body continuum-discretized coupled-channels (CDCC) method, making use of the binning procedure [I], is applied to the reaction He-6+Zn-64 at 13.6 MeV (around the Coulomb barrier). Excellent agreement with available elastic data [2] is found., This work was supported by the DGICYT under Projects FIS 2008-04189, FPA 2006-13807-C02-01, and consolider CPAN, by the U.S. Department of Energy by LLNL under Contract DE-AC52-07NA27344, and by the U.K. STFC under Grant EP/D003628.

Published
2010

11. Scattering of 11Be around the Coulomb barrier

Author

L. Acosta, M. A. G. Álvarez, M. V. Andrés, M. J. G. Borge, M. Cortés, J. M. Espino, D. Galaviz, J. Gómez-Camacho, A. Maira, I. Martel, A. M. Moro, I. Mukha, F. Pérez-Bernal, E. Reillo, K. Rusek, A. M. Sánchez-Benítez, O. Tengblad, Matko Milin, Tamara Niksic, Suzana Szilner, Dario Vretenar, and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Physics, Elastic scattering, Quasielastic scattering, Quasielastic, Coupled-channel, Scattering, 11Be, Coulomb barrier, Breakup, Nuclear physics, Electric field, Halo nuclei, Nuclear force, Born approximation, Nuclear Experiment, Computer Science::Information Theory
Abstract

Trabajo presentado a la "International Conference Nuclear Structure and Dynamics" celebrada en Croacia del 4 al 8 de mayo del 2009.-- El pdf del trabajo es la versión post-print., Preliminary results on the 11Be+120Sn quasielastic scattering as well as the 11Be→10Be+n breakup channel are presented in this work. The angular distributions of these channels were measured at REX‐ISOLDE‐CERN. The accuracy and angular range of the presented results provide stronger constrains to the theoretical interpretation than existing published results. We compare these new data with coupled‐channel (CC) and continuum‐discretized coupled‐channel (CDCC) calculations. The role played by transfer and breakup channels in the elastic scattering is discussed., This work has been supported by the Spanish CICYT, under the project FPA2007-62170, the Spanish Council of Science and Education (MEC) under the research grants FINURA (FPA2007-63074), CPAN (CSD 2007-00042), the DGICYT under the project FPA2006-13807-c02-01 and Consolider-Ingenio CSD-2007-00042. L.A. acknowledges financial support by XI Plan Propio de Investigación from the Universidad de Huelva.

Published
2009

12. Four-body continuum-discretized coupled-channels calculations: Application to 6He+64Zn at 13.6 MeV

Author

M. Rodríguez-Gallardo, J. M. Arias, J. Gómez-Camacho, A. M. Moro, I. J. Thompson, J. A. Tostevin, J. A. Caballero, C. E. Alonso, M. V. Andrés, J. E. García Ramos, F. Pérez-Bernal, and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Many-body problem, Physics, Elastic scattering, Nuclear reaction, Direct reactions induced by halo nuclei, Few-body systems, Coupled-channel models, Electric field, Coulomb blockade, Coulomb barrier, Atomic physics, Nucleon
Abstract

The recently developed four-body continuum-discretized coupled-channels (CDCC) method, making use of the binning procedure [1], is applied to the reaction 6He+64Zn at 13.6 MeV (around the Coulomb barrier). Excellent agreement with available elastic data [2] is found. Dirección General de Investigación Científica y Técnica FIS 2008-04189, FPA 2006- 13807-C02-01 U.S. Department of Energy DE-AC52-07NA27344 U.K. STFC EP/D003628

Published
2009

13. Analysis of the elastic scattering measured with a 23.7 MeV 7Be beam on a 9Be target

Author

K. C. C. Pires, I. Mukha, A. M. Moro, J. Gómez-Camacho, M. Huyse, O. Ivanov, S. Leash, D. Pauwels, R. Raabe, D. Smirnov, I. Stefanescu, P. Van Duppen, C. Angulo, E. Casarejos, M. Loiselet, G. Ryckwaert, I. Martel, A. M. Sánchez-Benítez, Valdir Guimaraes, José R. B. Oliveira, Kita C. D. Macario, Frederico A. Genezini, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Educación y Ciencia (MEC). España, and Spanish Consolider-Ingenio programme CPAN

Subjects
Elastic scattering, Physics, Nuclear Theory, Nuclear structure, Optical model, Coupled channels calculati, Angular distribution, medicine.anatomical_structure, Excited state, medicine, Measured elastic scattering, Atomic physics, Nuclear Experiment, Ground state, Nucleus, Excitation, Beam (structure)
Abstract

We present new data for the reaction 7Be+9Be measured at Elab =23.7 MeV. The elastic scattering angular distribution has been analyzed using the phenomenological optical model and the coupled-channels method. In the latter approach, we assumed a two-cluster model of the 7Be nucleus, and we included explicitly the ground state and first excited state of this nucleus. The contribution of the inelastic excitation of the 7Be nucleus to the quasielastic cross sections has been investigated. Ministerio de Educación y Ciencia (MEC). España FPA2006-13807-c02-01 Spanish Consolider-Ingenio programme CPAN CSD2007-00042

Published
2009

14. Near-barrier scattering of 6 He and 11 Be

Author

Acosta, Luis A., Escrig, D., González Álvarez, Marcos Aurelio, Andrés Martín, María Victoria, Espino Navas, José Manuel, Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Mukha, I., Tengblad, O., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and Ministerio de Ciencia Y Tecnología (MCYT). España

Subjects
Breakup reactions, Transfer to continuum, Nuclear Theory, Halo nuclei, Nuclear reactions, Dipole polarizability, Nuclear Experiment
Abstract

Experiments on halo nuclei at energies around the Coulomb barrier can provide good quality data on elastic, inelastic, breakup and nucleon transfer reactions. This information turns out to be very important to understand the structure and dynamics of these exotic nuclei. In this work we present relevant results obtained from recent scattering experiments of "Be and 'He on heavy targets at energies around the Coulomb barrier. Our data exhibit strong absorption effects in the elastic channel. The role played by transfer and breakup channels, and the coupling to the continuum, are studied using CDCC and DWBA calculations. Spanish MCyT FPA2005-02379, FPA2005-04660, FPA2006-13807-C02-02 Consolider Project CE-SCD2007-0042

Published
2008

15. Search for two-proton radioactivity of Mg-19 in a tracking experiment

Author

I. Mukha, K. Sümmerer, L. Acosta, M. A. G. Alvarez, E. Casarejos, A. Chatillon, D. Cortina-Gil, J. Espino, A. Fomichev, J. E. García-Ramos, H. Geissel, J. Gómez-Camacho, L. Grigorenko, J. Hoffmann, O. Kiselev, A. Korsheninnikov, N. Kurz, Yu. Litvinov, I. Martel, C. Nociforo, W. Ott, M. Pfutzner, C. Rodríguez-Tajes, E. Roeckl, M. Stanoiu, H. Weick, P. J. Woods, Lídia S. Ferreira, Paramasivan Arumugan, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and European Nuclear Structure Integrated Infrastructure Initiative (EURONS)

Subjects
Physics, Nuclear physics, Radioactivity, Proton, Measured Q2p, T1/2, Q value, Nuclear structure, Half-life, Atomic physics, Measured direct two-proton decay of 19Mg [from 24Mg fragmentation and subsequent 20Mg neutron knock-out], Vertex (geometry), Three-body model calculations
Abstract

The two-proton radioactivity of the previously unknown 19Mg ground-state is observed by tracking the decay products in-flight. The trajectories of the 2p-decay products, 17Ne+p+p, have been measured by using tracking micro-strip detectors which allowed to reconstruct the 2pdecay vertices and fragment correlations. The half-life of 19Mg deduced from the measured vertex distribution is 4.0(15) ps in the system of 19Mg. The Q-value of the 2p-decay of the 19Mg groundstate inferred from the measured p–p–17Ne correlations is 0.75(5) MeV. European Nuclear Structure Integrated Infrastructure Initiative (EURONS) EC-I3, FPA2003-05958, FPA2006-13807-C02-01

Published
2007

16. Is the optical model valid for the scattering of exotic nuclei?

Author

M. A. G. Alvarez, Joaquín Gómez-Camacho, Ismael Martel, A. M. Moro, M. J. G. Borge, D. Escrig, A. M. Sánchez-Benítez, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and Comisión Interministerial de Ciencia y Tecnología (CICYT). España

Subjects
Physics, Elastic scattering, Continuum discretization, Scattering, Optical model, Physics::Optics, chemistry.chemical_element, Coupled Channels, Inelastic scattering, Optical potential, Nuclear physics, chemistry, Break-up, Sensitivity (control systems), Nuclear Experiment, Helium, Exotic nuclei
Abstract

The optical model, and its applications to elastic, inelastic and transfer reactions is reviewed. The applicability of the optical model to the collisions of exotic nuclei is discussed. The sensitivity of recent experimental data of elastic scattering of 6He on 208Pb to the characteristics of the optical potential is investigated. Comisión Interministerial de Ciencia y Tecnología (CICYT). España FPA2002-04181-C04-02, FPA2002-04181-C04-04, FPA2003-05958

Published
2005

17. Scattering of 8He on 208Pb at 22 MeV

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Marquínez Durán, G., Sánchez Benítez, A. M., Martel, I., Acosta, Luis, Rusek, K., González Álvarez, Marcos Aurelio, Berjillos, R., Borge, M. J. G., Chbihi, Abdelahad, Cruz, C., Fernández García, Juan Pablo, Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Fernández Martínez, Begoña, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Marquínez Durán, G., Sánchez Benítez, A. M., Martel, I., Acosta, Luis, Rusek, K., González Álvarez, Marcos Aurelio, Berjillos, R., Borge, M. J. G., Chbihi, Abdelahad, Cruz, C., Fernández García, Juan Pablo, Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, and Fernández Martínez, Begoña

Abstract

The skin nucleus 8He is investigated by measuring the angular distribution of the elasticly scattered 8He and the 6,4He fragments produced in the collision with a 208Pb target at 22 MeV, just above the Coulomb barrier. The experiment was carried out at SPIRAL/GANIL in 2010. Here we present preliminary results for the elastic scattering.

Published
2013

18. Core excitation effects in halo nuclei using a transformed oscillator basis

Author

Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España), Junta de Andalucía, European Commission, Ministerio de Ciencia e Innovación (España), Lay, J. A., Arias, J.M., Gómez-Camacho, Joaquín, Moro, A.M., Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España), Junta de Andalucía, European Commission, Ministerio de Ciencia e Innovación (España), Lay, J. A., Arias, J.M., Gómez-Camacho, Joaquín, and Moro, A.M.

Abstract

A recent generalization of the Transformed Harmonic Oscillator basis, intended to consider core excitations in the structure of one nucleon halo nuclei, is applied to the break up of 11Be. The reaction studied is 11Be+208Pb at 69 MeV/nucleon. The experimental set up is designed to ensure pure dipole Coulomb excitations. Making use of the Equivalent Photon Method and the electromagnetic transition probabilities obtained with the transformed oscillator basis, a relevant contribution of the quadrupole excitations of the core is found. The inclusion of core excitations is, therefore, necessary for the correct extraction of the dipole electromagnetic transition probability of halo nuclei.

Published
2013

19. Core excitation effects in halo nuclei using a transformed oscillator basis

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia e Innovación (MICIN). España, Junta de Andalucía, Lay Valera, José Antonio, Arias Carrasco, José Miguel, Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia e Innovación (MICIN). España, Junta de Andalucía, Lay Valera, José Antonio, Arias Carrasco, José Miguel, Gómez Camacho, Joaquín José, and Moro Muñoz, Antonio Matías

Abstract

A recent generalization of the Transformed Harmonic Oscillator basis, intended to consider core excitations in the structure of one nucleon halo nuclei, is applied to the break up of 11Be. The reaction studied is 11Be+208Pb at 69 MeV/nucleon. The experimental set up is designed to ensure pure dipole Coulomb excitations. Making use of the Equivalent Photon Method and the electromagnetic transition probabilities obtained with the transformed oscillator basis, a relevant contribution of the quadrupole excitations of the core is found. The inclusion of core excitations is, therefore, necessary for the correct extraction of the dipole electromagnetic transition probability of halo nuclei.

Published
2012

20. Core excitation effects in the breakup of halo nuclei

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Moro Muñoz, Antonio Matías, Diego, Raúl de, Lay Valera, José Antonio, Crespo, R., Johnson, Ron C., Arias Carrasco, José Miguel, Gómez Camacho, Joaquín José, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Moro Muñoz, Antonio Matías, Diego, Raúl de, Lay Valera, José Antonio, Crespo, R., Johnson, Ron C., Arias Carrasco, José Miguel, and Gómez Camacho, Joaquín José

Abstract

The role of core excitation in the structure and dynamics of two-body halo nuclei is investigated. We present calculations for the resonant breakup of 11Be on protons at an incident energy of 63.7 MeV/nucleon, where core excitation effects were shown to be important. To describe the reaction, we use a recently developed extension of the DWBA formalism which incorporates these core excitation effects within the no-recoil approximation. The validity of the no-recoil approximation is also examined by comparing with DWBA calculations which take into account core recoil. In addition, calculations with two different continuum representations are presented and compared.

Published
2012

21. Stabilization method in two-body systems with core excitations

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Lay Valera, José Antonio, Arias Carrasco, José Miguel, Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Lay Valera, José Antonio, Arias Carrasco, José Miguel, Gómez Camacho, Joaquín José, and Moro Muñoz, Antonio Matías

Abstract

The validity of the stabilization method in core+valence systems including the possibility of exciting the core is studied. A pseudostate method, based on the transformed harmonic oscillator basis, is extended to include the core degrees of freedom. The method is applied to the case of 11Be structure considering the 0+ ground state and the 2+ first excited state of the 10Be core. The stabilization method is defined in terms of one parameter that can be chosen either discrete or continuous. In the application to 11Be, both cases are analyzed.

Published
2012

22. Elastic scattering of 9Li on 208Pb at energies around the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cubero, M., Fernández García, Juan Pablo, Lay Valera, José Antonio, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, M. J. G., Buchmann, L., Diget, C. A., Fulton, B., Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cubero, M., Fernández García, Juan Pablo, Lay Valera, José Antonio, Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Borge, M. J. G., Buchmann, L., Diget, C. A., Fulton, B., Gómez Camacho, Joaquín José, and Moro Muñoz, Antonio Matías

Abstract

We have studied the dynamical effects of the halo structure of 11Li on the scattering on heavy targets at energies around the Coulomb barrier. This experiment was performed at ISAC-II at TRIUMF with a world record in production of the post-accelerated 11Li beam. As part of this study we report here on the first measurement of the elastic cross section of the core nucleus, i.e. 9Li on 208Pb, at energies around the Coulomb barrier. A preliminary optical model analysis has been performed in order to extract a global optical potential to describe the measured angular distributions.

Published
2011

23. Study of the scattering of halo nuclei around the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia y Tecnología (MCYT). España, Ministerio de Educación y Ciencia (MEC). España, Acosta, Luis, Cubero, M., Escrig, D., Fernández García, Juan Pablo, Lay Valera, José Antonio, Moro Muñoz, Antonio Matías, Rodríguez Gallardo, Manuela, Sánchez Benítez, A. M., Alcorta, Martín, González Álvarez, Marcos Aurelio, Andrés Martín, María Victoria, Cortés Giraldo, Miguel Antonio, Espino Navas, José Manuel, Gómez Camacho, Joaquín José, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia y Tecnología (MCYT). España, Ministerio de Educación y Ciencia (MEC). España, Acosta, Luis, Cubero, M., Escrig, D., Fernández García, Juan Pablo, Lay Valera, José Antonio, Moro Muñoz, Antonio Matías, Rodríguez Gallardo, Manuela, Sánchez Benítez, A. M., Alcorta, Martín, González Álvarez, Marcos Aurelio, Andrés Martín, María Victoria, Cortés Giraldo, Miguel Antonio, Espino Navas, José Manuel, and Gómez Camacho, Joaquín José

Abstract

During the past ten years the present collaboration has carried out several experiments related with the study of radioactive nuclei. One of the topics in which we have centered our research, is the scattering of halo nuclei at energies around the Coulomb barrier. As part of this study, we present in this work a review of the results obtained from the scattering of 6He, 11Be and 11Li. The presence of a "halo" in these exotic nuclei is found to have a striking effect on the dynamics of these reactions, making their study an interesting experimental problem and a challenge for existing reaction theories.

Published
2011

24. Elastic scattering of Beryllium isotopes near the Coulomb barrier

Author

Pietro, A. di, Acosta, Luis, Martel, Ismael, Pérez-Bernal, Francisco, García Borge, María José, Tengblad, Olof, Vidal, Ana M., Gómez-Camacho, Joaquín, Pietro, A. di, Acosta, Luis, Martel, Ismael, Pérez-Bernal, Francisco, García Borge, María José, Tengblad, Olof, Vidal, Ana M., and Gómez-Camacho, Joaquín

Abstract

In this contribution, results of experiments performed with the three Beryllium isotopes 9,10,11Be on a medium mass 64Zn target, at a center of mass energy of ≈1.4 the Coulomb barrier, will be discussed. Elastic scattering angular distributions have been measured for the 9,10Be reactions. In the 11Be case the quasielastic scattering angular distribution was obtained. In the halo nucleus case, the angular distribution exhibit a non-Fresnel-type pattern with a strong damping of the Coulomb-nuclear interference peak. Moreover, it is found that the total reaction cross-section for the halo nucleus induced collision is more than double the ones extracted in the collisions induced by the non-halo Beryllium isotopes. A large contribution to the total-reaction cross-section in the 11Be case could be attributed to transfer and/or break-up events.

Published
2011

25. Study of the scattering of halo nuclei around the Coulomb barrier

Author

Acosta, Luis, Cubero, M., Escrig, Diego, Fernández-García, J. P., Lay, J. A., Moro, A.M., Rodríguez Gallardo, Manuela, Sánchez-Benítez, A. M., Alcorta, Martín, Álvarez, M. A. G., Andrés, María Victoria, García Borge, María José, Cortés-Giraldo, Miguel Antonio, Galaviz, D., García Ramos, José Enrique, Gómez-Camacho, Joaquín, Madurga, Miguel, Maira-Vidal, A., Martel, Ismael, Mukha, I., Pérez-Bernal, Francisco, Reillo, Eva María, Rusek, K., Tengblad, Olof, Acosta, Luis, Cubero, M., Escrig, Diego, Fernández-García, J. P., Lay, J. A., Moro, A.M., Rodríguez Gallardo, Manuela, Sánchez-Benítez, A. M., Alcorta, Martín, Álvarez, M. A. G., Andrés, María Victoria, García Borge, María José, Cortés-Giraldo, Miguel Antonio, Galaviz, D., García Ramos, José Enrique, Gómez-Camacho, Joaquín, Madurga, Miguel, Maira-Vidal, A., Martel, Ismael, Mukha, I., Pérez-Bernal, Francisco, Reillo, Eva María, Rusek, K., and Tengblad, Olof

Abstract

During the past ten years the present collaboration has carried out several experiments related with the study of radioactive nuclei. One of the topics in which we have centered our research, is the scattering of halo nuclei at energies around the Coulomb barrier. As part of this study, we present in this work a review of the results obtained from the scattering of 6He, 11Be and 11Li. The presence of a >halo> in these exotic nuclei is found to have a striking effect on the dynamics of these reactions, making their study an interesting experimental problem and a challenge for existing reaction theories.

Published
2011

26. Dynamic studies of 11Li and its core 9Li on 208Pb near the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cubero, M, Borge, M. J. G., Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Diget, C., Galaviz, D., Fernández García, Juan Pablo, Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Madurga, Miguel, Moro Muñoz, Antonio Matías, Mukha, I., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cubero, M, Borge, M. J. G., Acosta, Luis, Alcorta, Martín, González Álvarez, Marcos Aurelio, Diget, C., Galaviz, D., Fernández García, Juan Pablo, Gómez Camacho, Joaquín José, Lay Valera, José Antonio, Madurga, Miguel, Moro Muñoz, Antonio Matías, and Mukha, I.

Abstract

We measured the scattering of the halo nucleus 11Li and its core 9Li on the lead target at TRIUMF at energies below and around to the Coulomb barrier. We report here on our preliminary analysis of the inclusive breakup reaction.

Published
2010

27. Elastic scattering of 6He and 7Be on a 9Be target

Author

Pires, K.C.C., Mukha, I., Moro, A.M., Gómez-Camacho, Joaquín, Pires, K.C.C., Mukha, I., Moro, A.M., and Gómez-Camacho, Joaquín

Abstract

The elastic scattering data for the 6He+9Be and 7Be+9Be reactions, measured at Elab = 16.2 MeV and Elab = 23.7 MeV respectively, are presented and analyzed using the optical model and coupled‐channels formalisms.

Published
2010

28. Analysis of the elastic scattering measured with a 23.7 MeV 7Be beam on a 9Be target.

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Educación y Ciencia (MEC). España, Spanish Consolider-Ingenio programme CPAN, Pires, K. C. C., Mukha, I., Moro Muñoz, Antonio Matías, Gómez Camacho, Joaquín José, Huyse, M., Ivanov, O., Sanchez-Benitez, A. M., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Educación y Ciencia (MEC). España, Spanish Consolider-Ingenio programme CPAN, Pires, K. C. C., Mukha, I., Moro Muñoz, Antonio Matías, Gómez Camacho, Joaquín José, Huyse, M., Ivanov, O., and Sanchez-Benitez, A. M.

Abstract

We present new data for the reaction 7Be+9Be measured at Elab =23.7 MeV. The elastic scattering angular distribution has been analyzed using the phenomenological optical model and the coupled-channels method. In the latter approach, we assumed a two-cluster model of the 7Be nucleus, and we included explicitly the ground state and first excited state of this nucleus. The contribution of the inelastic excitation of the 7Be nucleus to the quasielastic cross sections has been investigated.

Published
2009

29. Scattering of 11 Be around the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Acosta, Luis, González Álvarez, Marcos Aurelio, Andrés Martín, María Victoria, García Borge, María José, Cortés, M., Espino Navas, José Manuel, Galaviz, D., Gómez Camacho, Joaquín José, Martel, Ismael, Moro Muñoz, Antonio Matías, Mukha, I., Pérez Bernal, Francisco, Reillo, E., Rusek, K., Sánchez Benítez, A. M., Tengblad, Olof, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Acosta, Luis, González Álvarez, Marcos Aurelio, Andrés Martín, María Victoria, García Borge, María José, Cortés, M., Espino Navas, José Manuel, Galaviz, D., Gómez Camacho, Joaquín José, Martel, Ismael, Moro Muñoz, Antonio Matías, Mukha, I., Pérez Bernal, Francisco, Reillo, E., Rusek, K., Sánchez Benítez, A. M., and Tengblad, Olof

Abstract

Preliminary results on the 11Be+120Sn quasielastic scattering as well as the 11Be → 10Be + n breakup channel are presented in this work. The angular distributions of these channels were measured at REX-ISOLDE-CERN. The accuracy and angular range of the presented results provide stronger constrains to the theoretical interpretation than existing published results. We compare these new data with coupled-channel (CC) and continuum-discretized coupled-channel (CDCC) calculations. The role played by transfer and breakup channels in the elastic scattering is discussed.

Published
2009

30. Four-body continuum-discretized coupled-channels calculations: Application to 6He+64Zn at 13.6 MeV

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Rodríguez Gallardo, Manuela, Arias Carrasco, José Miguel, Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Thompson, J., Tostevin, Jeffrey A., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Rodríguez Gallardo, Manuela, Arias Carrasco, José Miguel, Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Thompson, J., and Tostevin, Jeffrey A.

Abstract

The recently developed four-body continuum-discretized coupled-channels (CDCC) method, making use of the binning procedure [1], is applied to the reaction 6He+64Zn at 13.6 MeV (around the Coulomb barrier). Excellent agreement with available elastic data [2] is found.

Published
2009

31. Understanding 6He induced reactions at energies around the Coulomb barrier

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Moro Muñoz, Antonio Matías, Acosta, Luis, Arias Carrasco, José Miguel, García Borge, María José, Escrig, D., Gómez Camacho, Joaquín José, Martel, Ismael, Rodríguez Gallardo, Manuela, Sánchez Benítez, A. M., Tengblad, Olof, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Moro Muñoz, Antonio Matías, Acosta, Luis, Arias Carrasco, José Miguel, García Borge, María José, Escrig, D., Gómez Camacho, Joaquín José, Martel, Ismael, Rodríguez Gallardo, Manuela, Sánchez Benítez, A. M., and Tengblad, Olof

Abstract

Recent developments aimed to understand the observed features arising in the scattering of the Borromean nucleus 6He on heavy targets are discussed and compared with recent data for 6He+208Pb measured at the RIB facility at Louvain-la-Neuve at energies around the Coulomb barrier. The analysis of the elastic scattering data in terms of the optical model, reveals the presence of a long range absorption mechanism, that manifests in the form of a large value of the imaginary diffuseness parameter. The elastic data have been also compared with three–body CDCC calculations, based on a di-neutron model of 6He, and four–body CDCC calculations, based on a more realistic three-body model of this nucleus. Finally, the angular and energy distribution of a particles emitted at backward angles are discussed and compared with different theoretical approaches.We find that these a particles are produced mainly by a two-neutron transfer mechanism to very excited states in the residual nucleus.

Published
2009

32. Scattering of 11Be around the Coulomb barrier

Author

Acosta, Luis, Álvarez, M. A. G., Andrés, María Victoria, García Borge, María José, Cortés, M., Espino, J. M., Galaviz, D., Gómez-Camacho, Joaquín, Maira-Vidal, A., Martel, Ismael, Moro, A.M., Mukha, I., Pérez-Bernal, Francisco, Reillo, Eva María, Rusek, K., Sánchez-Benítez, A. M., Tengblad, Olof, Acosta, Luis, Álvarez, M. A. G., Andrés, María Victoria, García Borge, María José, Cortés, M., Espino, J. M., Galaviz, D., Gómez-Camacho, Joaquín, Maira-Vidal, A., Martel, Ismael, Moro, A.M., Mukha, I., Pérez-Bernal, Francisco, Reillo, Eva María, Rusek, K., Sánchez-Benítez, A. M., and Tengblad, Olof

Abstract

Preliminary results on the 11Be+120Sn quasielastic scattering as well as the 11Be→10Be+n breakup channel are presented in this work. The angular distributions of these channels were measured at REX‐ISOLDE‐CERN. The accuracy and angular range of the presented results provide stronger constrains to the theoretical interpretation than existing published results. We compare these new data with coupled‐channel (CC) and continuum‐discretized coupled‐channel (CDCC) calculations. The role played by transfer and breakup channels in the elastic scattering is discussed.

Published
2009

33. Near-barrier scattering of 6 He and 11 Be

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia Y Tecnología (MCYT). España, Acosta, Luis A., Escrig, D., González Álvarez, Marcos Aurelio, Andrés Martín, María Victoria, Espino Navas, José Manuel, Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Mukha, I. G., Tengblad, O., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia Y Tecnología (MCYT). España, Acosta, Luis A., Escrig, D., González Álvarez, Marcos Aurelio, Andrés Martín, María Victoria, Espino Navas, José Manuel, Gómez Camacho, Joaquín José, Moro Muñoz, Antonio Matías, Mukha, I. G., and Tengblad, O.

Abstract

Experiments on halo nuclei at energies around the Coulomb barrier can provide good quality data on elastic, inelastic, breakup and nucleon transfer reactions. This information turns out to be very important to understand the structure and dynamics of these exotic nuclei. In this work we present relevant results obtained from recent scattering experiments of "Be and 'He on heavy targets at energies around the Coulomb barrier. Our data exhibit strong absorption effects in the elastic channel. The role played by transfer and breakup channels, and the coupling to the continuum, are studied using CDCC and DWBA calculations.

Published
2008

34. Search for two-proton radioactivity of Mg-19 in a tracking experiment

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Nuclear Structure Integrated Infrastructure Initiative (EURONS), Mukha, Iván, Suemmerer, K., Acosta, L., González Álvarez, Marcos Aurelio, Espino Navas, José Manuel, Gómez Camacho, Joaquín José, Woods, P. J., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Nuclear Structure Integrated Infrastructure Initiative (EURONS), Mukha, Iván, Suemmerer, K., Acosta, L., González Álvarez, Marcos Aurelio, Espino Navas, José Manuel, Gómez Camacho, Joaquín José, and Woods, P. J.

Abstract

The two-proton radioactivity of the previously unknown 19Mg ground-state is observed by tracking the decay products in-flight. The trajectories of the 2p-decay products, 17Ne+p+p, have been measured by using tracking micro-strip detectors which allowed to reconstruct the 2pdecay vertices and fragment correlations. The half-life of 19Mg deduced from the measured vertex distribution is 4.0(15) ps in the system of 19Mg. The Q-value of the 2p-decay of the 19Mg groundstate inferred from the measured p–p–17Ne correlations is 0.75(5) MeV.

Published
2007

35. Probing 6He structure from proton inelastic collisions

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Crespo, R., Moro Muñoz, Antonio Matías, Thompson, I. J., Rodríguez Gallardo, Manuela, Gómez Camacho, Joaquín José, Arias Carrasco, José Miguel, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Crespo, R., Moro Muñoz, Antonio Matías, Thompson, I. J., Rodríguez Gallardo, Manuela, Gómez Camacho, Joaquín José, and Arias Carrasco, José Miguel

Abstract

We explore the Hyperspherical Harmonics pseudostate method to describe the 6He continuum. The method is use it within the multiple scattering of the transition amplitude (MST) approach to study inelastic scattering of p-6He at 700 MeV/u.

Published
2006

36. Is the optical model valid for the scattering of exotic nuclei?

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Comisión Interministerial de Ciencia y Tecnología (CICYT). España, Gómez Camacho, Joaquín José, Gonzalez Alvarez, Marcos Aurelio, Moro Muñoz, Antonio Matías, Martel, I., Sánchez Benítez, A. M., Escrig, D., Borge, M. J. G., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Comisión Interministerial de Ciencia y Tecnología (CICYT). España, Gómez Camacho, Joaquín José, Gonzalez Alvarez, Marcos Aurelio, Moro Muñoz, Antonio Matías, Martel, I., Sánchez Benítez, A. M., Escrig, D., and Borge, M. J. G.

Abstract

The optical model, and its applications to elastic, inelastic and transfer reactions is reviewed. The applicability of the optical model to the collisions of exotic nuclei is discussed. The sensitivity of recent experimental data of elastic scattering of 6He on 208Pb to the characteristics of the optical potential is investigated.

Published
2005

37. Core excitation effects in the breakup of halo nuclei.

Author

Moro, A. M., de Diego, R., Lay, J. A., Crespo, R., Johnson, R. C., Arias, J. M., and Gómez-Camacho, J.

Subjects
NUCLEAR excitation, NUCLEAR physics, NUCLEAR structure, PROTONS, BERYLLIUM isotopes, NUCLEAR energy
Abstract

The role of core excitation in the structure and dynamics of two-body halo nuclei is investigated. We present calculations for the resonant breakup of 11Be on protons at an incident energy of 63.7 MeV/nucleon, where core excitation effects were shown to be important. To describe the reaction, we use a recently developed extension of the DWBA formalism which incorporates these core excitation effects within the no-recoil approximation. The validity of the no-recoil approximation is also examined by comparing with DWBA calculations which take into account core recoil. In addition, calculations with two different continuum representations are presented and compared. [ABSTRACT FROM AUTHOR]

Published
2012
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38. Stabilization method in two-body systems with core excitations.

Author

Lay, J. A., Arias, J. M., Gómez-Camacho, J., and Moro, A. M.

Subjects
TWO-body problem (Physics), NUCLEAR excitation, HARMONIC oscillators, MATHEMATICAL transformations, DEGREES of freedom, GROUND state (Quantum mechanics), NUCLEAR physics
Abstract

The validity of the stabilization method in core+valence systems including the possibility of exciting the core is studied. A pseudostate method, based on the transformed harmonic oscillator basis, is extended to include the core degrees of freedom. The method is applied to the case of 11Be structure considering the 0+ ground state and the 2+ first excited state of the 10Be core. The stabilization method is defined in terms of one parameter that can be chosen either discrete or continuous. In the application to 11Be, both cases are analyzed. [ABSTRACT FROM AUTHOR]

Published
2012
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39. Scattering of 11Be Around the Coulomb barrier.

Author

Acosta, L., Álvarez, M. A. G., Andrés, M. V., Borge, M. J. G., Cortés, M., Espino, J. M., Galaviz, D., Gómez-Camacho, J., Maira, A., Martel, I., Moro, A. M., Mukha, I., Pérez-Bernal, F., Reillo, E., Rusek, K., Sánchez-Benítez, A. M., and Tengblad, O.

Subjects
ELASTIC scattering, QUASIPARTICLES, ANGULAR distribution (Nuclear physics), COULOMB functions, NUCLEAR physics
Abstract

Preliminary results on the 11Be+120Sn quasielastic scattering as well as the 11Be→10Be+n breakup channel are presented in this work. The angular distributions of these channels were measured at REX-ISOLDE-CERN. The accuracy and angular range of the presented results provide stronger constrains to the theoretical interpretation than existing published results. We compare these new data with coupled-channel (CC) and continuum-discretized coupled-channel (CDCC) calculations. The role played by transfer and breakup channels in the elastic scattering is discussed. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
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40. Analysis of the elastic scattering measured with a 23.7 MeV 7Be beam on a 9Be target.

Author

Pires, K. C. C., Mukha, I., Moro, A. M., Gómez-Camacho, J., Huyse, M., Ivanov, O., Leash, S., Pauwels, D., Raabe, R., Smirnov, D., Stefanescu, I., Van Duppen, P., Angulo, C., Casarejos, E., Loiselet, M., Ryckwaert, G., Martel, I., and Sánchez-Benítez, A. M.

Subjects
ELASTIC scattering, NUCLEAR reactions, COLLISIONS (Nuclear physics), RADIOACTIVE nuclear beams, ANGULAR correlations (Nuclear physics), NUCLEAR physics
Abstract

We present new data for the reaction 7Be+9Be measured at Elab = 23.7 MeV. The elastic scattering angular distribution has been analyzed using the phenomenological optical model and the coupled-channels method. In the latter approach, we assumed a two-cluster model of the 7Be nucleus, and we included explicitly the ground state and first excited state of this nucleus. The contribution of the inelastic excitation of the 7Be nucleus to the quasielastic cross sections has been investigated. [ABSTRACT FROM AUTHOR]

Published
2009
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41. 9Be breakup polarization potential at near barrier energies.

Author

Garcia, V. N., Lubian, J., Gomes, P. R. S., Canto, L. F., and Gómez-Camacho, A.

Subjects
POLARIZATION (Nuclear physics), PARTICLES (Nuclear physics), COLLISIONS (Nuclear physics), NUCLEAR matter, NUCLEAR reactions, NUCLEAR physics
Abstract

In this work, we study the 9Be+144Sm system with the aim of extracting the breakup polarization potential and to check the influence of this channel on other reaction channels at energies close to the Coulomb barrier. As the projectile breaks up into four fragments the Continuum Discretized Coupled Channel (CDCC) method becomes a tool very difficult to be used. For this reason, we developed a methodology that consists in calculating the dynamic polarization potential (DPP) for the breakup channel using a very simple approximate technique. This technique has already been recently used in obtaining the dynamic polarization potential for the 7Li+27Al system. [ABSTRACT FROM AUTHOR]

Published
2009
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42. Understanding 6He induced reactions at energies around the Coulomb barrier.

Author

Moro, A. M., Acosta, L., Arias, J. M., Borge, M. J. G., Escrig, D., Gómez-Camacho, J., Martel, I., Rodríguez-Gallardo, M., Sánchez-Benítez, A. M., and Tengblad, O.

Subjects
NUCLEAR reactions, ELASTIC scattering, NEUTRONS, PARTICLES (Nuclear physics), COLLISIONS (Nuclear physics), NUCLEAR physics
Abstract

Recent developments aimed to understand the observed features arising in the scattering of the Borromean nucleus 6He on heavy targets are discussed and compared with recent data for 6He+208Pb measured at the RIB facility at Louvain-la-Neuve at energies around the Coulomb barrier. The analysis of the elastic scattering data in terms of the optical model, reveals the presence of a long range absorption mechanism, that manifests in the form of a large value of the imaginary diffuseness parameter. The elastic data have been also compared with three—body CDCC calculations, based on a di-neutron model of 6He, and four—body CDCC calculations, based on a more realistic three-body model of this nucleus. Finally, the angular and energy distribution of α particles emitted at backward angles are discussed and compared with different theoretical approaches. We find that these α particles are produced mainly by a two-neutron transfer mechanism to very excited states in the residual nucleus. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
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43. Near-barrier scattering of 6He and 11Be.

Author

Acosta, L., Escrig, D., Galaviz, D., Sánchez-Benítez, A. M., Angulo, C., Álvarez, M. A. G., Andrés, M. V., Borge, M. J. G., Casarejos, E., Espino, J. M., García-Ramos, J. E., Gómez-Camacho, J., Martel, I., Moro, A. M., Mukha, I., Pérez-Bernal, F., Rodríguez, D., Rusek, K., and Tengblad, O.

Subjects
MATHEMATICAL continuum, PARTICLES (Nuclear physics), NUCLEAR physics, COLLISIONS (Nuclear physics), CP violation
Abstract

Experiments on halo nuclei at energies around the Coulomb barrier can provide good quality data on elastic, inelastic, breakup and nucleon transfer reactions. This information turns out to be very important to understand the structure and dynamics of these exotic nuclei. In this work we present relevant results obtained from recent scattering experiments of 11Be and 6He on heavy targets at energies around the Coulomb barrier. Our data exhibit strong absorption effects in the elastic channel. The role played by transfer and breakup channels, and the coupling to the continuum, are studied using CDCC and DWBA calculations. [ABSTRACT FROM AUTHOR]

Published
2008
Full Text
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44. Search for two-proton radioactivity of 19Mg in a tracking experiment.

Author

Mukha, I., Sümmerer, K., Acosta, L., Alvarez, M. A. G., Casarejos, E., Chatillon, A., Cortina-Gil, D., Espino, J., Fomichev, A., García-Ramos, J. E., Geissel, H., Gómez-Camacho, J., Grigorenko, L., Hoffmann, J., Kiselev, O., Korsheninnikov, A., Kurz, N., Litvinov, Yu., Martel, I., and Nociforo, C.

Subjects
SCIENTIFIC experimentation, NUCLEAR physics, PROTONS, RADIOACTIVITY, CHEMICAL detectors, SCIENTIFIC apparatus & instruments
Abstract

The two-proton radioactivity of the previously unknown 19Mg ground-state is observed by tracking the decay products in-flight. The trajectories of the 2p-decay products, 17Ne+p+p, have been measured by using tracking micro-strip detectors which allowed to reconstruct the 2p-decay vertices and fragment correlations. The half-life of 19Mg deduced from the measured vertex distribution is 4.0(15) ps in the system of 19Mg. The Q-value of the 2p-decay of the 19Mg ground-state inferred from the measured p-p-17Ne correlations is 0.75(5) MeV. [ABSTRACT FROM AUTHOR]

Published
2007
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45. Probing 6He structure from proton inelastic collisions.

Author

Crespo, R., Moro, A. M., Thompson, I. J., Rodríguez-Gallardo, M., Gómez-Camacho, J., and Arias, J. M.

Subjects
HELIUM, NOBLE gases, RADIOACTIVITY, PROTONS, COLLISIONS (Nuclear physics), COLLISIONS (Physics), NUCLEAR physics, PHYSICS
Abstract

We explore the Hyperspherical Harmonics pseudostate method to describe the 6He continuum. The method is use it within the multiple scattering of the transition amplitude (MST) approach to study inelastic scattering of p-6He at 700 MeV/u. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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46. Is the optical model valid for the scattering of exotic nuclei?

Author

Gómez-Camacho, J., Alvarez, M., Moro, A., Martel, I., Sánchez-Benítez, A., Escrig, D., and Borge, M. J. G.

Subjects
*EXOTIC nuclei, *NUCLEAR reactions, *COLLISIONS (Nuclear physics), *ELASTIC scattering, *NUCLEAR optical potentials, *NUCLEAR physics
Abstract

The optical model, and its applications to elastic, inelastic and transfer reactions is reviewed. The applicability of the optical model to the collisions of exotic nuclei is discussed. The sensitivity of recent experimental data of elastic scattering of 6He on 208Pb to the characteristics of the optical potential is investigated. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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47. Probing additional dimensions in the universe with neutron experiments.

Author

Frank, Alejandro, Van Isacker, Piet, and Gómez-Camacho, Joaquín

Subjects
NEUTRONS, PARTICLES (Nuclear physics), ELECTROMAGNETISM, FLUCTUATIONS (Physics), NUCLEAR physics, PHYSICS
Abstract

We investigate the modifications of the gravitational force in the context of recent work on large supplementary dimensions and deduce a formula for the expected compactification radius for the n additional dimensions in the universe, as a function of the Planck and the electro- weak scales. We argue that the correspondingly modified gravitational force gives rise to effects that, although very small, might be within the detection range of dedicated neutron scattering experiments. We discuss the characteristics of an experimental setup to observe these effects. [ABSTRACT FROM AUTHOR]

Published
2004
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48. Tensor Analysing Powers for 7Li Induced Transfer Breakup Reactions.

Author

Davis, N.J., Ward, R.P., Rusek, K., Clarke, N.M., Tungate, G., Griffith, J.A.R., Hall, S.J., Karban, O., Martel-Bravo, I., Nelson, J.M., Gómez-Camacho, J., Davinson, T., Ireland, D.G., Livingston, K., McDonald, E.W., Page, R.D., Sellin, P.J., Shepherd-Themistocleous, C.H., and Shotter, A.C.

Subjects
CALCULUS of tensors, NUCLEAR physics
Abstract

The tensor analysing power T20 has been measured for the 120Sn(7Li,8Be → 2α)119In and 120Sn(7Li,6Li* → α + d)121Sn transfer breakup reactions at 70 MeV bombarding energy. Coupled channels and continuum discretized coupled channels calculations, incorporating a detector phase space correction, were found to give good agreement with the data. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003
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49. Elastic scattering of 9Li on 208Pb at energies around the Coulomb barrier.

Author

Cubero, M., Fernández-García, J. P., Lay, J. A., Acosta, L., Alcorta, M., Alvarez, M. A. G., Borge, M. J. G., Buchmann, L., Diget, D. G., Fulton, B., Fynbo, H. O. U., Galaviz, D., Gómez-Camacho, J., Martel, I., Moro, A. M., Mukha, I., Nilsson, T., Sánchez-Benítez, A. M., Shotter, A., and Tengblad, O.

Subjects
ELASTIC scattering, LITHIUM isotopes, LEAD isotopes, COULOMB potential, POTENTIAL barrier, NUCLEAR structure, ANGULAR distribution (Nuclear physics)
Abstract

We have studied the dynamical effects of the halo structure of 11Li on the scattering on heavy targets at energies around the Coulomb barrier. This experiment was performed at ISAC-II at TRIUMF with a world record in production of the post-accelerated 11Li beam. As part of this study we report here on the first measurement of the elastic cross section of the core nucleus, i.e. 9Li on 208Pb, at energies around the Coulomb barrier. A preliminary optical model analysis has been performed in order to extract a global optical potential to describe the measured angular distributions. [ABSTRACT FROM AUTHOR]

Published
2011
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50. Core excitation effects in halo nuclei using a transformed oscillator basis.

Author

Lay, J. A., Arias, J. M., Gómez-Camacho, J., and Moro, A. M.

Subjects
NUCLEAR excitation, GENERALIZATION, HARMONIC oscillators, NUCLEAR structure, PARTICLES (Nuclear physics), BERYLLIUM isotopes, COULOMB excitation
Abstract

A recent generalization of the Transformed Harmonic Oscillator basis, intended to consider core excitations in the structure of one nucleon halo nuclei, is applied to the break up of 11Be. The reaction studied is 11Be+208Pb at 69 MeV/nucleon. The experimental set up is designed to ensure pure dipole Coulomb excitations. Making use of the Equivalent Photon Method and the electromagnetic transition probabilities obtained with the transformed oscillator basis, a relevant contribution of the quadrupole excitations of the core is found. The inclusion of core excitations is, therefore, necessary for the correct extraction of the dipole electromagnetic transition probability of halo nuclei. [ABSTRACT FROM AUTHOR]

Published
2013
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