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10 results on '"H. Al Falou"'

1. Precise branching ratio measurements in Ne19β decay and fundamental tests of the weak interaction

Author

S. O’Hagan, S. Sjue, M. Djongolov, Rae Austin, H. Al-Falou, C. Kierans, A. B. Garnsworthy, R. D’Entremont, B. Rebeiro, M. R. Pearson, L. Milovanovic, R. Churchman, R. Kshetri, R. Dunlop, E. R. Tardiff, S. S. Ntshangase, D. S. Cross, C. E. Svensson, G. Hackman, S. J. Williams, S. Triambak, G. C. Ball, Chandana Sumithrarachchi, J. N. Orce, S. Reeve, P. Z. Mabika, P. E. Garrett, and P. Finlay

Subjects
Semileptonic decay, Physics, Ion beam, Spectrometer, 010308 nuclear & particles physics, Branching fraction, Weak interaction, 01 natural sciences, Beta decay, Nuclear physics, Excited state, 0103 physical sciences, 010306 general physics, Ground state
Abstract

We used the 8$\pi$ $\gamma$-ray spectrometer at the TRIUMF-ISAC radiocative ion beam facility to obtain high-precision branching ratios for $^{19}$Ne $\beta^+$ decay to excited states in $^{19}$F. Together with other previous work, our measurements determine the superallowed $1/2^+ \to 1/2^+$ beta branch to the ground state in $^{19}$F to be 99.9878(7)\%, which is three times more precise than known previously. The implications of these measurements for testing a variety of weak interaction symmetries are discussed briefly.

Published
2019

2. Reorientation-effect measurement of the first 2+ state in 12C : Confirmation of oblate deformation

Author

Chandana Sumithrarachchi, H. Al Falou, J. Wong, D.L. Mavela, E. T. Rand, T.E. Drake, C. E. Svensson, S. J. Williams, N. Erasmus, C. Ngwetsheni, S. Sjue, M. Kumar Raju, D.S. Cross, A. B. Garnsworthy, C. J. Pearson, S. Masango, J. N. Orce, K. Abrahams, P. E. Garrett, M. Djongolov, G. G. O'Neill, E. R. Tardiff, E.H. Akakpo, M.J. Mokgolobotho, S. Triambak, C. Mehl, P. Finlay, Ritesh Kshetri, G. C. Ball, D. G. Jenkins, K. G. Leach, G. Hackman, R. Churchman, and Petr Navrátil

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Nuclear Theory, 010308 nuclear & particles physics, FOS: Physical sciences, State (functional analysis), 01 natural sciences, Coincidence, lcsh:QC1-999, Nuclear Theory (nucl-th), Ab initio quantum chemistry methods, Polarizability, Excited state, 0103 physical sciences, Quadrupole, Atomic physics, Nuclear Experiment (nucl-ex), 010306 general physics, Ground state, Nuclear Experiment, lcsh:Physics
Abstract

A Coulomb-excitation reorientation-effect measurement using the TIGRESS γ−ray spectrometer at the TRIUMF/ISAC II facility has permitted the determination of the 〈 2 1 + ‖ E 2 ˆ ‖ 2 1 + 〉 diagonal matrix element in 12C from particle−γ coincidence data and state-of-the-art no-core shell model calculations of the nuclear polarizability. The nuclear polarizability for the ground and first-excited (2 1 + ) states in 12C have been calculated using chiral NN N4LO500 and NN+3NF350 interactions, which show convergence and agreement with photo-absorption cross-section data. Predictions show a change in the nuclear polarizability with a substantial increase between the ground state and first excited 2 1 + state at 4.439 MeV. The polarizability of the 2 1 + state is introduced into the current and previous Coulomb-excitation reorientation-effect analyses of 12C. Spectroscopic quadrupole moments of Q S ( 2 1 + ) = + 0.053 ( 44 ) eb and Q S ( 2 1 + ) = + 0.08 ( 3 ) eb are determined, respectively, yielding a weighted average of Q S ( 2 1 + ) = + 0.071 ( 25 ) eb, in agreement with recent ab initio calculations. The present measurement confirms that the 2 1 + state of 12C is oblate and emphasizes the important role played by the nuclear polarizability in Coulomb-excitation studies of light nuclei.

Published
2018

3. Elastic scattering of $^{8}$He + $^{4}$He and two-neutron transfer and the influence of resonances in $^{12}$Be

Author

Riccardo Raabe, W. N. Catford, N. Curtis, C. Wheldon, H. Al Falou, J. S. Thomas, N. A. Orr, Martin Freer, T. Munoz-Britton, Franck Delaunay, F. M. Marqués, Neven Soić, N. I. Ashwood, N. L. Achouri, V. A. Ziman, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Elastic scattering, Physics, Excitation function, Nuclear and High Energy Physics, Molecular states, 010308 nuclear & particles physics, Scattering, Resonance, Halo nucleus, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, lcsh:QC1-999, Nuclear clustering, Light nuclei, 0103 physical sciences, Cluster (physics), Neutron, Atomic physics, 010306 general physics, Excitation, lcsh:Physics
Abstract

Scattering of 8He from 4He has been performed through the coincident detection of the scattered particles using a silicon array within a helium-4 gas volume with a 8He beam. This permitted the reconstruction of the interaction probability as a function of position within the gas and hence the excitation function to be calculated together with the angular distribution of the products. These measurements also enabled the reconstruction of the two-neutron transfer to 6He + 6He. The measurements provide the first characterisation of the scattering of the α+4n, 8He, halo nucleus from 4He and the 2n-transfer to populate the symmetric final state. The results indicate the presence of a L=4 component at excitation energies of 14–15 MeV, consistent with a broad (∼1 MeV) Jπ=4+ resonance. These measurements would agree with generalized two-centre cluster model (GTCM) calculations indicating a cluster, or molecular, structure predicted at this energy. ispartof: Physics Letters B vol:775 pages:58-62 status: published

Published
2017

4. Inelastic scattering of 9Li and excitation mechanism of its first excited state

Author

M. Uchida, Isao Tanihata, J. N. Orce, D. S. Cross, M. Djongolov, D. Niamir, Robert B. Wiringa, A. C. Shotter, Barry Davids, Corina Andreoiu, S. Triambak, H. Al Falou, D. Howell, P.L. Walden, Aaron Gallant, Ian J. Thompson, Ritesh Kshetri, S. Sjue, R. Kanungo, and N. Galinski

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Halo nucleus, Inelastic scattering, Deep inelastic scattering, 01 natural sciences, Inelastic neutron scattering, Excited state, 0103 physical sciences, Quadrupole, Physics::Accelerator Physics, Scattering theory, Atomic physics, 010306 general physics, Excitation
Abstract

The first measurement of inelastic scattering of 9 Li from deuterons at the ISAC facility is reported. The measured angular distribution for the first excited state confirms the nature of excitation to be an E2 transition. The quadrupole deformation parameter is extracted from an analysis of the angular distribution.

Published
2013

5. High-Precision Measurement of theNe19Half-Life and Implications for Right-Handed Weak Currents

Author

G. Hackman, S. Triambak, L. Milovanovic, Ritesh Kshetri, R. A. E. Austin, D. S. Cross, J. N. Orce, E. R. Tardiff, C. Kierans, M. R. Pearson, S. O’Hagan, Chandana Sumithrarachchi, P. Finlay, S. Reeve, S. Sjue, S. J. Williams, H. Al-Falou, M. Djongolov, R. Churchman, A. B. Garnsworthy, P. E. Garrett, C. E. Svensson, G. C. Ball, and R. D’Entremont

Subjects
Physics, Particle physics, Current (mathematics), Right handed, 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, 010306 general physics, 01 natural sciences, Standard Model
Abstract

We report a precise determination of the $^{19}\mathrm{Ne}$ half-life to be ${T}_{1/2}=17.262\ifmmode\pm\else\textpm\fi{}0.007\text{ }\text{ }\mathrm{s}$. This result disagrees with the most recent precision measurements and is important for placing bounds on predicted right-handed interactions that are absent in the current standard model. We are able to identify and disentangle two competing systematic effects that influence the accuracy of such measurements. Our findings prompt a reassessment of results from previous high-precision lifetime measurements that used similar equipment and methods.

Published
2012

6. Low-lying neutronfp-shell intruder states in27Ne

Author

S. M. Brown, W. N. Catford, J. S. Thomas, B. Fernández-Domínguez, N. A. Orr, M. Labiche, M. Rejmund, N. L. Achouri, H. Al Falou, N. I. Ashwood, D. Beaumel, Y. Blumenfeld, B. A. Brown, R. Chapman, M. Chartier, N. Curtis, G. de France, N. de Sereville, F. Delaunay, A. Drouart, C. Force, S. Franchoo, J. Guillot, P. Haigh, F. Hammache, V. Lapoux, R. C. Lemmon, A. Leprince, F. Maréchal, X. Mougeot, B. Mouginot, L. Nalpas, A. Navin, N. P. Patterson, B. Pietras, E. C. Pollacco, A. Ramus, J. A. Scarpaci, I. Stefan, and G. L. Wilson

Subjects
Physics, Nuclear and High Energy Physics, Quenching (fluorescence), 010308 nuclear & particles physics, Nuclear Theory, SHELL model, Shell (structure), 01 natural sciences, Nuclear physics, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Beam (structure)
Abstract

The quenching of the N=20 shell gap in neutron-rich nuclei is investigated by studying the single-particle structure of 27Ne via neutron transfer using a 26Ne beam. Two low-lying negative-parity intruder states have been observed, the lowest of which is identified as Jπ=3/2−, confirming earlier speculations. A level identified as 7/2− is observed higher in energy than the 3/2−, contrary to the ordering at β-stability and at an energy significantly different from the predictions of previous shell-model calculations. The measured energies and deduced spectroscopic factors are well reproduced in full (0,1)-ℏω 0s-0p-0d-1s-0f-1p calculations in which there is a significant ad hoc reduction (∼0.7 MeV) in the N=20 shell gap.

Published
2012

7. Emergence of theN=16shell gap inO21

Author

B. Fernández-Domínguez, J. S. Thomas, W. N. Catford, F. Delaunay, S. M. Brown, N. A. Orr, M. Rejmund, M. Labiche, M. Chartier, N. L. Achouri, H. Al Falou, N. I. Ashwood, D. Beaumel, Y. Blumenfeld, B. A. Brown, R. Chapman, N. Curtis, C. Force, G. de France, S. Franchoo, J. Guillot, P. Haigh, F. Hammache, V. Lapoux, R. C. Lemmon, F. Maréchal, A. M. Moro, X. Mougeot, B. Mouginot, L. Nalpas, A. Navin, N. Patterson, B. Pietras, E. C. Pollacco, A. Leprince, A. Ramus, J. A. Scarpaci, N. de Séréville, I. Stephan, O. Sorlin, and G. L. Wilson

Subjects
Physics, Radioactive ion beams, Nuclear and High Energy Physics, Light nucleus, 010308 nuclear & particles physics, 0103 physical sciences, SHELL model, Shell (structure), Atomic physics, 010306 general physics, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), 01 natural sciences
Abstract

This is the publisher's version, also available electronically from http://journals.aps.org/prc/abstract/10.1103/PhysRevC.84.011301.

Published
2011

8. Towards Na-26 via (d,p) with SHARC and TIGRESS and a novel zero-degree detector

Author

M. Djongolov, M. Porter-Peden, H. J. Boston, S. M. Brown, C. Aa. Diget, Jun Chen, C. Unsworth, N. Galinski, U. Hager, N. A. Orr, D. S. Cross, R. Churchman, J. N. Orce, A. B. Garnsworthy, A. Chen, G. Hackman, S. Sjue, C. J. Pearson, C. E. Svensson, G. L. Wilson, R. Kanungo, J. Dech, W. N. Catford, S. J. Williams, B. R. Fulton, A. J. Boston, R. A. E. Austin, F. Sarazin, R. Ashley, P. Adsley, T.E. Drake, R. Wadsworth, S. P. Fox, D. S. Jamieson, J. P. Martin, G. C. Ball, H. Al-Falou, K. G. Leach, S. Triambak, J. C. Blackmon, C. Sumithrarachchi, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear reaction, History, Proton, 010308 nuclear & particles physics, Detector, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Particle detector, Computer Science Applications, Education, Semiconductor detector, Nuclear physics, 0103 physical sciences, Scintillation counter, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

Nucleon transfer experiments have in recent years begun to be exploited in the study of nuclei far from stability, using radioactive beams in inverse kinematics. New techniques are still being developed in order to perform these experiments. The present experiment is designed to study the odd-odd nucleus Na which has a high density of states and therefore requires gamma-ray detection to distinguish between them. The experiment employed an intense beam of up to 3×10 pps of Na at 5.0 MeV/nucleon from the ISAC-II facility at triumf. The new silicon array SHARC was used for the first time and was coupled to the segmented clover gamma-ray array TIGRESS. A novel thin plastic scintillator detector was employed at zero degrees to identify and reject reactions occurring on the carbon component of the (CD) target. The efficiency of the background rejection using this detector is described with respect to the proton and gamma-ray spectra from the (d,p) reaction. © Published under licence by IOP Publishing Ltd.

Published
2011

9. Structure of the neutron-rich N = 7 isotones 10Li and 9He

Author

A. Leprince, H. Al Falou, N. A. Orr, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, History, Proton, 010308 nuclear & particles physics, Nuclear Theory, Resonance, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, Computer Science Applications, Education, Nuclear physics, Intermediate energy, Coincident, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment, Beam (structure)
Abstract

The near threshold structure of the unbound N=7 isotones 10Li and 9He has been investigated using proton removal and breakup from intermediate energy (35 MeV/nucleon) secondary beams of 11Be and 14,15B. The coincident detection of the beam velocity 9Li and 8He fragments and neutrons permitted the relative energy of the in-flight decay of 10Li and 9He to be reconstructed. Both systems were found to exhibited virtual s-wave strength near threshold together with a higher-lying resonance., Comment: 4 pages, 2 figures, Contribution to INPC2010 - "International Nuclear Physics Conference", Vancouver, Canada, 4-9 July 2010, Proceedings to be published in Journal of Physics: Conference Series

Published
2010

10. Study of the $^{20}$O(d,t) reaction with the TIARA-MUST2-VAMOS-EXOGAM setup

Author

A. RAMUS, N. L. ACHOURI, H. AL FALOU, N. I. ASHWOOD, D. BEAUMEL, Y. BLUMENFELD, S. M. BROWN, W. N. CATFORD, R. CHAPMAN, M. CHARTIER, N. CURTIS, F. DELAUNAY, B. FERNÁNDEZ-DOMÍNGUEZ, C. FORCE, G. DE FRANCE, S. FRANCHOO, J. GUILLOT, D. GUPTA, P. HAIGH, F. HAMMACHE, M. LABICHE, V. LAPOUX, R. C. LEMMON, F. MARÉCHAL, B. MARTIN, X. MOUGEOT, B. MOUGINOT, L. NALPAS, A. NAVIN, N. A. ORR, N. PATTERSON, B. PIETRAS, E. C. POLLACCO, A. LE PRINCE, M. REJMUND, J. A. SCARPACI, N. DE SÉRÉVILLE, I. STEFAN, O. SORLIN, J. S. THOMAS, G. L. WILSON, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Gamma ray, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Nuclear physics, Angular distribution, 0103 physical sciences, Atomic physics, 010306 general physics, Nuclear Experiment, Radioactive beam
Abstract

The reaction 20 O ( d , t ) has been studied in inverse kinematics using a secondary radioactive beam produced with the SPIRAL facility at GANIL. Fragments, light charged particles and gamma rays were measured with the TIARA, MUST2, VAMOS and EXOGAM detectors and preliminary results are reported. The level scheme of 19 O is built and the spin and parity of one state is tentatively assigned using the one-neutron transfer angular distribution.

Published
2008

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