301 results on '"Achouri, N. L."'
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152. Collapse of theN=28Shell Closure inS42i
- Author
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Bastin, B., primary, Grévy, S., additional, Sohler, D., additional, Sorlin, O., additional, Dombrádi, Zs., additional, Achouri, N. L., additional, Angélique, J. C., additional, Azaiez, F., additional, Baiborodin, D., additional, Borcea, R., additional, Bourgeois, C., additional, Buta, A., additional, Bürger, A., additional, Chapman, R., additional, Dalouzy, J. C., additional, Dlouhy, Z., additional, Drouard, A., additional, Elekes, Z., additional, Franchoo, S., additional, Iacob, S., additional, Laurent, B., additional, Lazar, M., additional, Liang, X., additional, Liénard, E., additional, Mrazek, J., additional, Nalpas, L., additional, Negoita, F., additional, Orr, N. A., additional, Penionzhkevich, Y., additional, Podolyák, Zs., additional, Pougheon, F., additional, Roussel-Chomaz, P., additional, Saint-Laurent, M. G., additional, Stanoiu, M., additional, Stefan, I., additional, Nowacki, F., additional, and Poves, A., additional
- Published
- 2007
- Full Text
- View/download PDF
153. Observation of [sup 19]Na states by inelastic scattering
- Author
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Pellegriti, M. G., primary, Achouri, N. L., additional, Angulo, C., additional, Angélique, J. C., additional, Berthoumieux, E., additional, Casarejos, E., additional, Couder, M., additional, Davinson, T., additional, Descouvemont, P., additional, Ghag, C., additional, Murphy, A. S., additional, Orr, N. A., additional, Ray, I., additional, Stefan, I. G., additional, Ferreira, Lídia S., additional, and Arumugan, Paramasivan, additional
- Published
- 2007
- Full Text
- View/download PDF
154. The β-decay of 22Al
- Author
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Achouri, N. L., primary, de Oliveira Santos, F., additional, Lewitowicz, M., additional, Blank, B., additional, Äystö, J., additional, Canchel, G., additional, Czajkowski, S., additional, Dendooven, P., additional, Emsallem, A., additional, Giovinazzo, J., additional, Guillet, N., additional, Jokinen, A., additional, Laird, A. M., additional, Longour, C., additional, Peräjärvi, K., additional, Smirnova, N., additional, Stanoiu, M., additional, and Thomas, J. -C., additional
- Published
- 2006
- Full Text
- View/download PDF
155. Search for neutron excitations across theN=20shell gap inNe25−29
- Author
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Belleguic, M., primary, Azaiez, F., additional, Dombrádi, Zs., additional, Sohler, D., additional, Lopez-Jimenez, M. J., additional, Otsuka, T., additional, Saint-Laurent, M. G., additional, Sorlin, O., additional, Stanoiu, M., additional, Utsuno, Y., additional, Penionzhkevich, Yu.-E., additional, Achouri, N. L., additional, Angelique, J. C., additional, Borcea, C., additional, Bourgeois, C., additional, Daugas, J. M., additional, Oliveira-Santos, F. De, additional, Dlouhy, Z., additional, Donzaud, C., additional, Duprat, J., additional, Elekes, Z., additional, Grévy, S., additional, Guillemaud-Mueller, D., additional, Leenhardt, S., additional, Lewitowicz, M., additional, Lukyanov, S. M., additional, Mittig, W., additional, Porquet, M. G., additional, Pougheon, F., additional, Roussel-Chomaz, P., additional, Savajols, H., additional, Sobolev, Y., additional, Stodel, C., additional, and Timár, J., additional
- Published
- 2005
- Full Text
- View/download PDF
156. Spectroscopy around N = 20 shell closure: β–n decay study of 35Al
- Author
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Timis, C, primary, Angélique, J C, additional, Buta, A, additional, Achouri, N L, additional, Baiborodin, D, additional, Baumann, P, additional, Borcea, C, additional, Courtin, S, additional, Dessagne, P, additional, Dlouhy, Z, additional, Daugas, J M, additional, Grévy, S, additional, Guillemaud-Mueller, D, additional, Knipper, A, additional, Lecolley, F R, additional, Lecouey, J L, additional, Lewitowicz, M, additional, Liénard, E, additional, Lukyanov, S M, additional, Marqués, F M, additional, Miehé, C, additional, Mrazek, J, additional, Negoita, F, additional, Nowacki, F, additional, Oliveira, F de, additional, Orr, N A, additional, Péter, J, additional, Pietri, S, additional, Penionzhkevich, Yu E, additional, Poirier, E, additional, Stanoiu, M, additional, and Walter, G, additional
- Published
- 2005
- Full Text
- View/download PDF
157. The 7 Be( d , p )2α Cross Section at Big Bang Energies and the Primordial 7 Li Abundance
- Author
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Angulo, C., primary, Casarejos, E., additional, Couder, M., additional, Demaret, P., additional, Leleux, P., additional, Vanderbist, F., additional, Coc, A., additional, Kiener, J., additional, Tatischeff, V., additional, Davinson, T., additional, Murphy, A. S., additional, Achouri, N. L., additional, Orr, N. A., additional, Cortina-Gil, D., additional, Figuera, P., additional, Fulton, B. R., additional, Mukha, I., additional, and Vangioni, E., additional
- Published
- 2005
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158. N=14and 16 shell gaps in neutron-rich oxygen isotopes
- Author
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Stanoiu, M., primary, Azaiez, F., additional, Dombrádi, Zs., additional, Sorlin, O., additional, Brown, B. A., additional, Belleguic, M., additional, Sohler, D., additional, Saint Laurent, M. G., additional, Lopez-Jimenez, M. J., additional, Penionzhkevich, Y. E., additional, Sletten, G., additional, Achouri, N. L., additional, Angélique, J. C., additional, Becker, F., additional, Borcea, C., additional, Bourgeois, C., additional, Bracco, A., additional, Daugas, J. M., additional, Dlouhý, Z., additional, Donzaud, C., additional, Duprat, J., additional, Fülöp, Zs., additional, Guillemaud-Mueller, D., additional, Grévy, S., additional, Ibrahim, F., additional, Kerek, A., additional, Krasznahorkay, A., additional, Lewitowicz, M., additional, Leenhardt, S., additional, Lukyanov, S., additional, Mayet, P., additional, Mandal, S., additional, van der Marel, H., additional, Mittig, W., additional, Mrázek, J., additional, Negoita, F., additional, De Oliveira-Santos, F., additional, Podolyák, Zs., additional, Pougheon, F., additional, Porquet, M. G., additional, Roussel-Chomaz, P., additional, Savajols, H., additional, Sobolev, Y., additional, Stodel, C., additional, Timár, J., additional, and Yamamoto, A., additional
- Published
- 2004
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- View/download PDF
159. Neutron and charged particle identification by means of various detectors.
- Author
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SÉNOVILLE, M., ACHOURI, N. L., DELAUNAY, F., GIBELIN, J., LAURENT, B., LEDOUX, X., MARQUÉS, F. M., ORR, N. A., FONTBONNE, C., CARNIOL, B., CHAVENTRÉ, T., CUSSOL, D., ETASSE, D., FONTBONNE, J. M., HARANG, J., HOMMET, J., PLARD, H., POINCHEVAL, J., LOPEZ, O., and LENEINDRE, N.
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DETECTORS , *PHOTONS , *NEUTRONS , *HEAVY ions , *SCINTILLATORS , *PARTICLES (Nuclear physics) - Abstract
Identification methods for photons, neutrons and heavy ions by using scintillator and semiconductor detectors are discussed by stressing the advantages of signal digitization. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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- View/download PDF
160. Astrophysically Important Reaction Rates For Novae And X-ray Bursts From Proton Breakup At Intermediate Energies.
- Author
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Banu, A., Trache, L., Carstoiu, F., Orr, N. A., Achouri, N. L., Bonaccorso, A., Catford, W. N., Chartier, M., Fernandez-Dominguez, B., Freer, M., Gaudefroy, L., Horoi, M., Labiche, M., Laurent, B., Lemmon, R. C., Negoita, F., Paschalis, S., Patterson, N., Pietras, B., and Roeder, B.
- Subjects
CHEMICAL kinetics ,NOVAE (Astronomy) ,PROTONS ,X-ray astronomy ,NUCLEAR astrophysics ,X-ray bursts ,NUCLEAR engineering ,IONIZING radiation - Abstract
We discuss the use of one-nucleon removal reactions of loosely bound nuclei at intermediate energies as an indirect method in nuclear astrophysics. The breakup reactions are proved to be good spectroscopic tools and can be used to study a large number of loosely bound proton- or neutron-rich nuclei over a wide range of beam energies. As peripheral processes, they can be used to extract asymptotic normalization coefficients (ANCs) from which non-resonant capture reaction rates of astrophysical interest can be calculated parameter free. In this talk, we present results of a proton-breakup experiment carried out at GANIL (France) with a cocktail beam centered around
23 Al at 50 MeV/nucleon. Momentum distributions of the breakup fragments, inclusive and in coincidence with gamma rays detected by EXOGAM Germanium clover array, were measured in the focal plan of SPEG energy-loss spectrometer. We present in particular the investigations of reaction rates for22 Mg(p,γ)23 Al and23 Al(p,γ)24 Si important for novae and X-ray bursts, respectively. [ABSTRACT FROM AUTHOR]- Published
- 2010
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161. Identification of a new low-lying state in the proton drip line nucleus19Na
- Author
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Angulo, C., primary, Tabacaru, G., additional, Couder, M., additional, Gaelens, M., additional, Leleux, P., additional, Ninane, A., additional, Vanderbist, F., additional, Davinson, T., additional, Woods, P. J., additional, Schweitzer, J. S., additional, Achouri, N. L., additional, Angélique, J. C., additional, Berthoumieux, E., additional, de Oliveira Santos, F., additional, Himpe, P., additional, and Descouvemont, P., additional
- Published
- 2003
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162. Spectroscopy of 16O Using α+12C Resonant Scattering in Inverse Kinematics.
- Author
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Ashwood, N. I., Freer, M., Achouri, N. L., Bloxham, T. R., Catford, W. N., Curtis, N., Haigh, P. J., Harlin, C. W., Patterson, N. P., Price, D. L., Soic, N., and Thomas, J. S.
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SPECTRUM analysis ,ELASTIC scattering ,NUCLEAR excitation ,NUCLEAR energy ,MATRICES (Mathematics) - Abstract
A measurement of the α(
12 C,α)12 C reaction has been performed using resonant scattering with a gas target. Beam energies of 46, 51, 56 and 63 MeV were used to populate resonances in the excitation energy range of 11.6 to 22.9 MeV in16 O. The angular distributions of the elastic scattering were measured at zero degrees using an array of segmented silicon strip detectors with a minimum range of 0° to 30° in the centre of mass. The spins of 8 resonances between 14.1 and 18.5 MeV were obtained, confirming spin assignments made using elastic scattering in normal kinematics. An R-matrix analysis of the data was performed which indicates that the present understanding of16 O in this region is good, but not complete. [ABSTRACT FROM AUTHOR]- Published
- 2009
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163. Measurement of the Gamow-Teller Branching Ratio in the β-Decay of 21Na.
- Author
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Achouri, N. L., Angélique, J.-C., Ban, G., Bastin, B., Blank, B., Dean, S., Dendooven, P. G., Giovinazzo, J., Grévy, S., Jungmann, K., Laurent, B., Liénard, E., Naviliat-Cuncic, O., Orr, N. A., Rogachevskiy, A., Sohani, M., Traykov, E., and Wilschut, H.
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POTENTIAL barrier , *BRANCHING ratios , *DECAY schemes (Radioactivity) , *NUCLEAR physics , *SODIUM , *RADIOACTIVITY - Abstract
The β-decay branching ratio of the GT transition in 21Na to the first excited state in 21Ne has been measured. The value obtained of 4.93(20)% is in agreement with the most recent measurement and with the value adopted so far. This confirms that the branching ratio is not the source of discrepancy in a previous measurement of β-v correlation coefficient which exhibited a 3σ difference with respect to the Standard Model prediction. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
164. Observation of 19Na states by inelastic scattering.
- Author
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Pellegriti, M. G., Achouri, N. L., Angulo, C., Angélique, J. C., Berthoumieux, E., Casarejos, E., Couder, M., Davinson, T., Descouvemont, P., Ghag, C., Murphy, A. S., Orr, N. A., Ray, I., and Stefan, I. G.
- Subjects
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SODIUM , *KINEMATICS , *POLYETHYLENE , *SCATTERING (Physics) , *RADIOACTIVE nuclear beams - Abstract
The low-energy levels of 19Na were studied in the center-of-mass energy (ECM) range from 2.6 to 3.4 MeV, by using the elastic and inelastic scattering methods in inverse kinematics. The 18Ne+p scattering reactions, leading to the ground state and the first excited state of 18Ne, were investigated by using a 66 MeV radioactive 18Ne beam and a polyethylene (CH2)n target. The experimental methods and the set-up are described and preliminary results are presented. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
165. Spectroscopy Near the N=20 Shell Closure: β-n Decay Studies of 33Mg and 35Al.
- Author
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Angélique, J. C., Timis, C., Piétri, S., Achouri, N. L., Baumann, P., Borcea, C., Buta, A., Catford, W., Courtin, S., Daugas, J. M., Dessagne, P., De Oliveira, F., Dlouhy, Z., Grévy, S., Guillemaud-Mueller, D., Hadeler, R., Knipper, A., Lecolley, F. R., Lecouey, J. L., and Lewitowicz, M.
- Subjects
RADIOACTIVE decay ,NUCLEAR reactions ,RADIOACTIVITY ,ALUMINUM isotopes ,MAGNESIUM isotopes ,NUCLEAR physics ,PHYSICS - Abstract
An experimental spectroscopic investigation of some neutron rich Mg and Al isotopes around the shell closure N=20 has been performed. The delayed neutron and γ spectra, following the β-decay of 33Mg and 35Al have been measured using the delayed neutron detector array TONNERRE coupled with high efficiency EXOGAM clover detectors, a LEPS detector and eight low-energy neutron detectors. A detailed analysis of such spectra allows one to construct the level schemes of their daughters, 32,33Al and 34,35Si. The resulting spectroscopic information will provide stringent tests of large scale shell model calculations including np - nh excitations aimed at the understanding of the structural effects occurring in this region. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2006
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166. FIRST RESULTS WITH TONNERRE (A NEW DETECTOR FOR DELAYED-NEUTRON SPECTROSCOPY)
- Author
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ANGELIQUE, J. C., primary, ACHOURI, N. L., additional, GREVY, S., additional, LECOLLEY, F. R., additional, LECOUEY, J. L., additional, LIENARD, E., additional, ORR, N. A., additional, PETER, J., additional, PIETRI, S., additional, BORCEA, C., additional, BUTA, A., additional, NEGOITA, F., additional, TIMIS, C., additional, DE OLIVEIRA, F., additional, LEWITOWICZ, M., additional, STANOIU, M., additional, TARASOV, O., additional, BAUMANN, P., additional, COURTIN, S., additional, DESSAGNE, P., additional, HADELER, R., additional, KNIPPER, A., additional, MIEHE, C., additional, POIRIER, E., additional, WALTER, G., additional, GUILLEMAUD-MUELLER, D., additional, PENIONZHKEVICH, D. Y., additional, DLOUHY, D. Z., additional, MRAZEK, J., additional, DAUGAS, J. M., additional, and CATFORD, W. N., additional
- Published
- 2002
- Full Text
- View/download PDF
167. Nuclear Structure around the N=16 subshell closure.
- Author
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Sorlin, O., Stanoiu, M, Dombrádi, Zs., azaiez, F., Brown, B. A., Belleguic, M., Sohler, D., Laurent, M. G. Saint, Lopez-Jimenez, M. J., Penionzhkevich, Y. E., Sletten, G., Achouri, N. L., Becker, F., Angélique, J. C., Borcea, C., Bourgeois, C., Daugas, J. M., Dlouhý, Z., Donzaud, C., and Duprat, J.
- Subjects
NUCLEAR structure ,SPECTRUM analysis ,RADIOACTIVE nuclear beams ,PHYSICS ,NEUTRONS ,ISOTOPES - Abstract
In-beam gamma-spectroscopy using fragmentation reactions of both stable and radioactive beams have been performed in order to study the structure of excited states in the neutron-rich 18,20C, 21–24O and 23,25F isotopes. For the produced fragments, γ-ray energies, intensities and γγ coincidences have been measured. Based on this information new level schemes are proposed up to the neutron separation energy for some of these isotopes. The systematics of the 2+ energy has been extended up to 20C in the C isotopic chain. Level schemes are suggested for 21O and 22O. The non observation of any γ-ray from 23O and 24O suggests that their excited states lie above the neutron decay thresholds. The study of F isotopes provides hint of the possible change in nuclear structure between the F and O isotopic chains. These results, together with the size of the N=14 and N=16 shell gaps in C,O,F isotopes are discussed in the framework of shell model calculations. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
168. Observation of a new transition in the β-delayed neutron decay of16C
- Author
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Grévy, S., primary, Achouri, N. L., additional, Angélique, J. C., additional, Borcea, C., additional, Buta, A., additional, De Oliveira, F., additional, Lewitowicz, M., additional, Liénard, E., additional, Martin, T., additional, Negoita, F., additional, Orr, N. A., additional, Peter, J., additional, Pietri, S., additional, and Timis, C., additional
- Published
- 2001
- Full Text
- View/download PDF
169. In-Beam Gamma Spectroscopy of Very Neutron-rich Nuclei at GANIL
- Author
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Belleguic, M., primary, Lopez-Jimenez, M. J., additional, Stanoiu, M., additional, Azaiez, F., additional, Saint-Laurent, M. G., additional, Sorlin, O., additional, Achouri, N. L., additional, Ang?lique, J. C., additional, Borcea, C., additional, Bourgeois, C., additional, Daugas, J. M., additional, Donzaud, C., additional, De Oliveira-Santos, F., additional, Dlouhy, Z., additional, Duprat, J., additional, Grevy, S., additional, Guillemaud-Mueller, D., additional, Leenhardt, S., additional, Lewitowicz, M., additional, Mittig, W., additional, Mueller, A. C., additional, Orr, N., additional, Penionzhkevich, Yu-E., additional, Porquet, M. G., additional, Pougheon, F., additional, Roussel-Chomaz, P., additional, Sauvestre, J. E., additional, Savajols, H., additional, and Sobolov, Yu., additional
- Published
- 2000
- Full Text
- View/download PDF
170. In-beam gamma spectroscopy of very neutron-rich nuclei at GANIL
- Author
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Azaiez, F., primary, Belleguic, M., additional, Sorlin, O., additional, Leenhardt, S., additional, Bourgeois, C., additional, Donzaud, C., additional, Duprat, J., additional, Guillemaud-Mueller, D., additional, Mueller, A. C., additional, Pougheon, F., additional, Saint-Laurent, M. G., additional, Lopez, M. J., additional, Achouri, N. L., additional, Daugas, J. M., additional, Lewitowicz, M., additional, Mittig, W., additional, De Oliveira, F., additional, Roussel-Chomaz, P., additional, Savajols, H., additional, Penionzhkevich, Yu-E., additional, Sobolev, Yu., additional, Borcea, C., additional, Stanoiu, M., additional, Angelique, J. C., additional, Grevy, S., additional, Orr, N., additional, Deloncle, I., additional, Kiener, J., additional, Porquet, M. G., additional, Marie, F., additional, Gillibert, A., additional, Sauvestre, J. E., additional, Dlouhy, Z., additional, and Shuying, W., additional
- Published
- 1999
- Full Text
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171. γ-ray production by inelastic proton scattering on16Oand12C
- Author
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Kiener, J., primary, Berheide, M., additional, Achouri, N. L., additional, Boughrara, A., additional, Coc, A., additional, Lefebvre, A., additional, de Oliveira Santos, F., additional, and Vieu, Ch., additional
- Published
- 1998
- Full Text
- View/download PDF
172. STUDY OF NEUTRON RICH NUCLEUS 25F VIA SINGLE-STEP FRAGMENTATION.
- Author
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VAJTA, ZS., SOHLER, D., DOMBRÁDI, ZS., AZAIEZ, F., SORLIN, O., STANOIU, M., ACHOURI, N. L., ANGÉLIQUE, J. C., BELLEGUIC, M., BORCEA, C., BOURGEOIS, C., DAUGAS, J. M., De Oliveira-Santos, F., DLOUHY, Z., DONZAUD, C., DUPRAT, J., GRÉVY, S., GUILLEMAUD-MUELLER, D., LEENHARDT, S., and LEWITOWICZ, M.
- Subjects
ATOMIC nucleus ,NEUTRONS ,NUCLEAR structure ,NUCLEAR physics ,SIMULATION methods & models - Abstract
The structure of nucleus
25 F was studied by use of in-beam -ray spectroscopy of the fragmentation of a36 S beam. The emitted rays were detected by BaF2 detectors. In the -ray spectrum obtained a wide bump between 3 and 4.5 MeV energy was observed corresponding to a set of γ rays, including their first and second escape peaks. In order to resolve the peaks and to determine the high-energy structure of25 F, the experimental spectra were compared to Geant4 simulations taking the complex line shape into account. The observed decomposition of the bump is in good agreement with the results of the two-step fragmentation experiment [Zs. Vajta et al., submitted to Phys. Rev. C]. Furthermore, an additional transition was observed at 2140(30) keV. [ABSTRACT FROM AUTHOR]- Published
- 2013
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173. Resonances in 11C observed in the 4He(7Be, &agr;)7Be and 4He(7Be, p)10B reactions.
- Author
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Freer, M., Achouri, N. L., Angulo, C., Ashwood, N. I., Bardayan, D. W., Brown, S., Catford, W. N., Chipps, K. A., Curtis, N., Demaret, P., Harlin, C., Laurent, B., Malcolm, J. D., Milin, M., Munoz-Britton, T., Orr, N. A., Pain, S. D., Price, D., Raabe, R., and Soi&caucte;, N.
- Subjects
- *
NUCLEAR reactions , *HELIUM , *BINDING energy , *BERYLLIUM , *SCATTERING (Physics) , *CLEBSCH-Gordan coefficients , *CLUSTER theory (Nuclear physics) , *NUCLEAR structure - Abstract
Measurements of the 4He(7Be,&agr;)7Be and 4He(7Be, p)10B reactions were performed using 7Be beam energies of 7.1 and 23 MeV and a helium-4 target, employing the thick target technique. Resonances were observed between Ex(11C) = 8.6 to 13.8 MeV. An matrix analysis was performed to characterize the spins and partial widths. This analysis showed that the observed sequence of states was consistent with that found for 7Li + &agr; resonant scattering populating resonances in 11B. A comparison of the proposed partial widths for decay with the Wigner limit indicates that several of the states are associated with cluster-like structures. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
174. SHELLS AND SHAPES IN THE 44S NUCLEUS.
- Author
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Cáceres, L., Sohler, D., Grévy, S., Force, C., Sorlin, O., Dombrádi, Zs., Gaudefroy, L., Achouri, N. L., Angélique, J. C., Azaiez, F., Bayborodin, D., Bastin, B., Borcea, R., Bourgeois, C., Buta, A., Bürger, A., Chapman, R., Dalouzy, J. C., Dlouhy, Z., and Drouard, A.
- Subjects
NUCLEAR shell theory ,SPECTRUM analysis ,ELECTRONS ,SULFUR isotopes ,CALCIUM isotopes ,SILICON isotopes ,NUCLEAR excitation - Abstract
The results obtained from electron and in-beam spectroscopy experiments reveal that the
44 S nucleus is located in a transitional region between the spherical44 Ca and the oblate44 Si. The comparison of the results with Large Scale Shell Model calculations points towards prolate-spherical shape coexistence where the ground state becomes the intruder configuration due to quadrupole excitations across the Z = 14 and N = 28 shell gaps. [ABSTRACT FROM AUTHOR]- Published
- 2011
- Full Text
- View/download PDF
175. STUDY OF THE 20O(d,t) REACTION WITH THE TIARA-MUST2-VAMOS-EXOGAM SETUP.
- Author
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RAMUS, A., ACHOURI, N. L., AL FALOU, H., ASHWOOD, N. I., BEAUMEL, D., BLUMENFELD, Y., BROWN, S. M., CATFORD, W. N., CHAPMAN, R., CHARTIER, M., CURTIS, N., DELAUNAY, F., FERNÁNDEZ-DOMÍNGUEZ, B., FORCE, C., DE FRANCE, G., FRANCHOO, S., GUILLOT, J., GUPTA, D., HAIGH, P., and HAMMACHE, F.
- Subjects
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KINEMATICS , *RADIOACTIVE nuclear beams , *GAMMA rays , *DETECTORS , *ANGULAR distribution (Nuclear physics) - Abstract
The reaction 20O(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 19O is built and the spin and parity of one state is tentatively assigned using the one-neutron transfer angular distribution. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
176. New low-energy measurement of the 18F(p,α)15O reaction.
- Author
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de Séréville, N., Angulo, C., Coc, A., Achouri, N. L., Casarejos, E., Davinson, T., Descouvemont, P., Figuera, P., Fox, S., Hammache, F., Kiener, J., Laird, A., Lefebvre, A., Leleux, P., Mumby-Croft, P., Orr, N., Robertson, D., Vaughan, K., and Tatischeff, V.
- Published
- 2007
- Full Text
- View/download PDF
177. Observation of bound excited states in15B.
- Author
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Stanoiu, M., Belleguic, M., Dombrádi, Zs., Sohler, D., Azaiez, F., Brown, B. A., Lopez-Jimenez, M. J., Saint-Laurent, M. G., Sorlin, O., Penionzhkevich, Yu.-E., Achouri, N. L., Angélique, J. C., Borcea, C., Bourgeois, C., Daugas, J. M., de Oliveira-Santos, F., Dlouhy, Z., Donzaud, C., Duprat, J., and Grévy, S.
- Subjects
EXCITED state chemistry ,PHYSICAL & theoretical chemistry ,SPECTRUM analysis ,FRAGMENTATION reactions ,NEUTRONS ,CHEMICAL reactions - Abstract
The structure of theA/Z = 3 nucleus
15 B has been investigated using the in-beam-spectroscopy technique with a fragmentation reaction of a36 S beam on a9 Be target at 77.5. The fragments were identified and selected by their energy loss and time of flight using the SPEG spectrograph.-ray energies and intensities have been measured in coincidence with the projectile-like fragments. From this information as well as from the-coincidence relationships a level scheme is proposed for15 B up to the neutron separation energy. The experimental results have been interpreted using shell model calculations in thepsdvalence space. Effects of the weakly bound nature of the valence neutrons have been observed. [ABSTRACT FROM AUTHOR]- Published
- 2004
- Full Text
- View/download PDF
178. Primordial 7Li abundance and the role of the 7Be(d,p)2α reaction.
- Author
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Angulo, C., Casarejos, E., Couder, M., Demaret, P., Leleux, P., Vanderbist, F., Coc, A., Kiener, J., Tatischeff, V., Davinson, T., Murphy, A. S., Figuera, P., Achouri, N. L., Orr, N. A., Cortina-Gil, D., Fulton, B. R., Mukha, I., and Vangioni, E.
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LITHIUM ,ALKALI metals ,NUCLEOSYNTHESIS ,CHEMICAL elements ,PHYSICS ,NUCLEAR physics - Abstract
Using the very precise value of the baryonic density of the Universe recently obtained by WMAP, Big Bang Nucleosynthesis calculations predict a primordial 7Li abundance which is a factor 2 – 3 higher than that observed in galactic halo dwarf stars. Up to now, the role of the 7Be(d,p)2α reaction has been neglected. We have studied this reaction, for the first time at energies appropriate to the Big Bang environment, at the CYCLONE facility at Louvain-la-Neuve using a radioactive 7Be beam. The experimental set-up is briefly described. Results and consequences for primordial nucleosythensis are discussed. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]
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- 2006
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179. Isomeric island in the vicinity of 66Fe.
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Daugas, J. M., Sawicka, M., Pfützner, M., Matea, I., Grawe, H., Grzywacz, R., Achouri, N. L., Angélique, J. C., Baiborodin, D., Becker, F., Bélier, G., Bentida, R., Béraud, R., Bingham, C., Borcea, C., Borcea, R., Bouchez, E., Buta, A., Catford, W. N., and Dragulescu, E.
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IRON ,METALS ,NUCLEAR isomers ,NUCLEAR physics ,ISOTOPES ,NICKEL - Abstract
An island of isomers have recently been observed on both sides of the N=40 shell below the Ni isotopes. Isomeric states in the 65Fe and 67Fe allow the knowledge of the single particle structure around the νg9/2 shell. Moreover, the excitation energy of the first 2+ and 4+ states in the 68Fe have been established by β-γ correlation. The evolution of the structure of the Fe isotopes going far away from the valley of stability is, for the first time, given for N>40. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]
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- 2006
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180. Observation of the 02+ state in 44S.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Grévy, S., Negoita, F., Stefan, I., Achouri, N. L., Angélique, J. C., Bastin, B., Borcea, R., Buta, A., Daugas, J. M., De Oliveira, F., Giarmana, O., Jollet, C., Laurent, B., Lazar, M., Liénard, E., Maréchal, F., and Mrázek, J.
- Abstract
We report preliminary results on the observation of the isomeric 02+ state in 44S. This state, populated in the fragmentation of a 48Ca beam, is located at 1365 ± 1 keV and has a half-life of 2.3 ± 0.3 µs. The observation of this isomer is the first experimental evidence of shape coexistence in 44S which was predicted by various theoretical approaches. In particular, we found a good agreement with shell model calculations. [ABSTRACT FROM AUTHOR]
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- 2005
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181. Observation of the 0+2 state in 44S.
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Grévy, S., Negoita, F., Stefan, I., Achouri, N. L., Angélique, J. C., Bastin, B., Borcea, R., Buta, A., Daugas, J. M., De Oliveira, F., Giarmana, O., Jollet, C., Laurent, B., Lazar, M., Liénard, E., Maréchal, F., Mrázek, J., Pantelica, D., Penionzhkevich, Y., and Piétri, S.
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NUCLEAR shell theory ,NUCLEAR models ,HALF-life (Nuclear physics) ,NUCLEAR physics ,NUCLEAR reactions - Abstract
We report preliminary results on the observation of the isomeric 0
+ 2 state in44 S. This state, populated in the fragmentation of a48 Ca beam, is located at 1365±1 keV and has a half-life of 2.3±0.3 μs. The observation of this isomer is the first experimental evidence of shape coexistence in44 S which was predicted by various theoretical approaches. In particular, we found a good agreement with shell model calculations. [ABSTRACT FROM AUTHOR]- Published
- 2005
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182. Observation of isoscalar multipole strengths in exotic doubly-magic $^{56}$Ni in inelastic α scattering in inverse kinematics
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Bagchi, S., Gibelin, J., Harakeh, M. N., Kalantar-Nayestanaki, N., Achouri, N. L., Akimune, H., Bastin, B., Boretzky, K., Bouzomita, H., Caamaño, M., Càceres, L., Damoy, S., Delaunay, F., Fernández-Domínguez, B., Fujiwara, M., Garg, U., Grinyer, G. F., Kamalou, O., Khan, E., Krasznahorkay, A., Lhoutellier, G., Libin, J. F., Lukyanov, S., Mazurek, K., Najafi, M. A., Pancin, J., Penionzhkevich, Y., Perrot, L., Raabe, R., Rigollet, C., Roger, T., Sambi, S., Savajols, H., Senoville, M., Stodel, C., Suen, L., Thomas, J. C., Vandebrouck, M., and Van De Walle, J.
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3. Good health - Abstract
Physics letters / B 751, 371 - 375 (2015). doi:10.1016/j.physletb.2015.10.060, Published by North-Holland Publ., Amsterdam
183. Study of multi-neutron emission in the $\beta$-decay of $^{11}$Li
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Delaunay, F., Achouri, N. L., Algora, A., Assié, M., Balibrea, J., Banerjee, K., Bhattacharya, C., Borge, M. J. G., Cano-Ott, D., Fernández-Domínguez, B., Fraile, L. M., Gibelin, J., Lund, M. V., Madurga, M., Marqués, F. M., Marroquin, I., Martínez, T., Mendoza, E., Orr, N. A., Pârlog, M., Pereira-López, X., Pestel, V., Riisager, K., Santos, C., Matthieu Sénoville, Tengblad, O., Vedia, V., 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Département de Physique Nucléaire (ex SPhN) (DPHN), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
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Astrophysics::High Energy Astrophysical Phenomena ,Nuclear Physics - Experiment ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,nucl-ex ,Nuclear Experiment - Abstract
The kinematics of two-neutron emission following the $\beta$-decay of $^{11}$Li was investigated for the first time by detecting the two neutrons in coincidence and by measuring their angle and energy. An array of liquid-scintillator neutron detectors was used to reject cosmic-ray and $\gamma$-ray backgrounds by pulse-shape discrimination. Cross-talk events in which two detectors are fired by a single neutron were rejected using a filter tested on the $\beta$-1n emitter $^9$Li. A large cross-talk rejection rate is obtained ($> 95 \%$) over most of the energy range of interest. Application to $^{11}$Li data leads to a significant number of events interpreted as $\beta$-2n decay. A discrete neutron line at $\approx$ 2 MeV indicates sequential two-neutron emission, possibly from the unbound state at 10.6 MeV excitation energy in $^{11}$Be., Comment: 4 pages, Proceedings of the EuNPC2018 Conference
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184. Spectroscopy of 21O through (d,p) reaction with the TIARA-MUST2-VAMOS-EXOGAM set-up
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Fernández-DomÍnguez, B, Achouri, N. L, Al-Falou, H, Delaunnay, F, Orr, N. A, le Prince, A, Chartier, M, Pietras, B, Beaumel, D, Curtis, N, Haigh, P, Blumenfeld, Y, Franchoo, S, Guillot, J, Hammache, F, Marechal, F, Mouginot, B, Ramus, A, Scarpaci, J. A, de Séréville, N, Stefan, I, Brown, S. M, Catford, W. N, Patterson, N, Wilson, G, Chapman, R, de France, G, Force, C, Navin, A, Rejmund, M, Gupta, D, Lemmon, R. C, Labiche, M, Martin, B, Mougeot, X, Nalpas, L, Pollacco, E. C, Ashwood, N. A, Lapoux, V, Sorlin, O, and Thomas, J. S
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TASK 10 [10] - Abstract
Spectroscopy of 21O through (d,p) reaction with the TIARA-MUST2-VAMOS-EXOGAM set-up
185. Single-neutron knockout from $^{20}$C and the structure of$^{19}$C
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Hwang, J. W., Kim, S., Satou, Y., Orr, N. A., Kondo, Y., Nakamura, T., Gibelin, J., Achouri, N. L., Aumann, T., Baba, H., Delaunay, F., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kameda, D., Kanno, D., Kobayashi, N., Kobayashi, T., Kubo, T., Leblond, S., Lee, J., Marqués, F. M., Minakata, R., Motobayashi, T., Murai, D., Murakami, T., Muto, K., Nakashima, T., Nakatsuka, N., Navin, A., Nishi, S., Ogoshi, S., Otsu, H., Sato, H., Shimizu, Y., Suzuki, H., Takahashi, K., Takeda, H., Takeuchi, S., Tanaka, R., Togano, Y., Tuff, A. G., Vandebrouck, M., and Yoneda, K.
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3. Good health - Abstract
Physics letters / B 769, 503 - 508 (2017). doi:10.1016/j.physletb.2017.04.019, Published by North-Holland Publ., Amsterdam
186. Recent results from GANIL
- Author
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Franchoo, S., Achouri, N. L., Algora, A., Al-Khatib, A., Angélique, J. -C, Azaiez, F., Baiborodin, D., Bastin, B., Beaumel, D., Belleguic, M., Benzoni, G., Blumenfeld, Y., Borcea, C., Borcea, R., Bourgeois, C., Bringel, P., Brown, B. A., Bürger, A., Buta, A., Chapman, R., Clément, E., Dalouzy, J. -C, Dlouhy, Z., Dombradi, Z., Drouart, A., Elekes, Z., Engelhardt, C., Fortier, S., Fülöp, Z., Gaudefroy, L., Gélin, M., Gibelin, J., Görgen, A., Grévy, S., Guillemaud-Mueller, D., Hammache, F., Hübel, H., Iacob, S., Ibrahim, F., Kemper, K., Kerek, A., Wolfram KORTEN, Krasznahorkay, A., Kratz, K. -L, Laurent, B., Lazar, M., Lebhertz, D., Lewitowicz, M., Liang, X., Liénard, E., Lukyanov, S., Mandal, S., Monrozeau, C., Mrazek, J., Nalpas, L., Navin, A., Negoita, F., Nowacki, F., Orr, N., Ostrowski, A., Otsuka, T., Pantelica, D., Penionzhkevich, Y., Piekarewicz, J., Podolyak, Z., Pollacco, E., Pougheon, F., Poves, A., Rotaru, F., Roussel-Chomaz, P., Rich, E., Scarpaci, J. -A, Saint-Laurent, M. -G, Savajols, H., Sletten, G., Sohler, D., Sorlin, O., Stanoiu, M., Stefan, I., Suzuki, T., Theisen, C., Timar, J., Timis, C., Tryggestad, E., Verney, D., Williams, S., Yamamoto, A., Institut de Physique Nucléaire d'Orsay (IPNO), 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), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Pluridisciplinaire Hubert Curien (IPHC), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), The University of Tokyo (UTokyo), Nihon University, The University of Tokyo, 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), and Lion, Michel
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[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,23.20.Lv, 25.45.Hi, 25.70.-z, 27.30.+t, 27.40.+z ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] - Abstract
Expérience GANIL, Also available at http://th-www.if.uj.edu.pl/acta/; International audience; The shell structure of the nucleus implies the existence of magic numbers. Since several years many indications have been accumulated, theoretically as well as through experiments at various laboratories around the world, that if one moves away from stability, the location of the magic numbers shifts as an inescapable consequence of the evolving nature of the nuclear force itself. In this respect, it is the balance between the tensor and spin-orbit components that seems particularly instrumental. Illustrative examples from recent experiments at Ganil, at the neutron-rich and proton-rich side of the nuclear chart for N or Z equal 20 or 28, will be presented here.
187. Identification of a new low-lying state in the proton drip line nucleus 19Na
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Angulo, C., Tabacaru, G., Couder, M., Gaelens, M., Leleux, P., Ninane, A., Vanderbist, F., Davinson, T., Woods, P. J., Schweitzer, J. S., Achouri, N. L., Angélique, J. C., Berthoumieux, E., Oliveira Santos, F., Himpe, P., Pierre Descouvemont, 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)
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[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] - Full Text
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188. Reaction cross section of the two-neutron halo nucleus22C at 235 MeV/nucleon
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Togano, Y., Nakamura, T., Kondo, Y., Kobayashi, N., Tanaka, R., Minakata, R., Ogoshi, S., Nishi, S., Kanno, D., Nakashima, T., Tsubota, J., Saito, A. T., Tostevin, J. A., Orr, N. A., Gibelin, J., Delaunay, F., Marques, F. M., Achouri, N. L., Leblond, S., Deshayes, Q., Yoneda, K., Motobayashi, T., Otsu, H., Isobe, T., Baba, H., Sato, H., Shimizu, Y., Kubo, T., Inabe, N., Fukuda, N., Kameda, D., Suzuki, H., Takeda, H., Lee, J., Pieter Doornenbal, Takeuchi, S., Kobayashi, T., Takahashi, K., Muto, K., Murakami, T., Nakatsuka, N., Satou, Y., Kim, S., Hwang, J., Aumann, T., Murai, D., Navin, A., Tuff, A. G., and Vandebrouck, M.
189. Observation of Na-19 states by inelastic scattering
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Pellegriti, M. G., Achouri, N. L., Angulo, C., Angelique, J. C., Berthoumieux, E., Casarejos, E., Manoel Couder, Davinson, T., Descouvemont, P., Ghag, C., Murphy, A. S., Orr, N. A., Ray, I., and Stefan, I. G.
190. In-Beam Gamma Spectroscopy of Very Neutron-rich Nuclei at GANIL
- Author
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Belleguic, M., Lopez-Jimenez, M. J., Mihai Stanoiu, Azaiez, F., Saint-Laurent, M. G., Sorlin, O., Achouri, N. L., Angélique, J. C., Borcea, C., Bourgeois, C., Daugas, J. M., Donzaud, C., Oliveira-Santos, F., Dlouhy, Z., Duprat, J., Grevy, S., Guillemaud-Mueller, D., Leenhardt, S., Lewitowicz, M., Mittig, W., Mueller, A. C., Orr, N., Penionzhkevich, Yu -E, Porquet, M. G., Pougheon, F., Roussel-Chomaz, P., Sauvestre, J. E., Savajols, H., Sobolev, Yu, Institut de Physique Nucléaire d'Orsay (IPNO), 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), 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), 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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)
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[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
191. Ultra high precision measurement of the half-life of 19Neon
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Jevremović, A., Ujić, P., Oliveira Santos, F., Achouri, N. L., Baastin, B., Boulay, F., Briand, J. B., Benitez, A. M. S., Bouzomita, H., Borcea, C., Borcea, R., Blank, B., Carniol, B., Pierre DELAHAYE, Delaunay, F., Durand, D., Etasse, D., Fremont, G., France, G., Fontbonne, J. M., Fontbonne, C., Flechard, X., Grinyer, G., Hommet, J., Lewitowicz, M., Mrazek, J., Martel, I., Parlog, M., Rotaru, F., Ramos, D., Spitaels, C., Stanoiu, M., Thomas, J. C., and Toprek, D.
192. Study of states in 14C via the 10Be(4He,4He)10Be reaction.
- Author
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Malcolm, J. D., Freer, M., Ashwood, N. I., Curtis, N., Munoz-Britton, T., Wheldon, C., Ziman, V. A., Catford, W. N., Brown, S., Wilson, G., Soic, N., Bardayan, D., Pain, S. D., Achouri, N. L., Chipps, K., and Crzywacz-Jones, K.
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- 2012
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193. The 7Be(d, p)2α Cross Section at Big Bang Energies and the Primordial 7Li Abundance.
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Angulo, C., Casarejos, E., Couder, M., Demaret, P., Leleux, P., Vanderbist, F., Coc, A., Kiener, J., Tatischeff, V., Davinson, T., Murphy, A. S., Achouri, N. L., Orr, N. A., Cortina-Gil, D., Figuera, P., Fulton, B. R., Mukha, I., and Vangioni, E.
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- 2005
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194. In-beam g-spectroscopy using projectile fragmentation: Structure of neutron-rich nuclei around N = 20
- Author
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Belleguic, M., Lopez-Jimenez, M. J., Stanoiu, M., Azaiez, F., Saint-Laurent, M. G., Sorlin, O., Achouri, N. L., Angelique, J. C., Bourgeois, C., and Borcea, C.
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- 2001
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195. Resonances in 14C observed in the 4He(10Be,α)10Be reaction.
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Freer, M., Malcolm, J. D., Achouri, N. L., Ashwood, N. I., Bardayan, D. W., Brown, S. M., Catford, W. N., Chipps, K. A., Cizewski, J., Curtis, N., Jones, K. L., Munoz-Britton, T., Pain, S. D., Soić, N., Wheldon, C., Wilson, G. L., and Ziman, V. A.
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- *
BERYLLIUM spectra , *BERYLLIUM isotopes , *CARBON isotopes , *ANGULAR distribution (Nuclear physics) , *NUCLEAR reactions , *RESONANCE fluorescence , *ALPHA decay , *HELIUM isotopes - Abstract
The α(10Be,α)10Be resonant scattering reaction has been measured at nine 10Be beam energies from 25 to 48 MeV, scanning out resonances in 14C from excitation energies of 13 to 24 MeV. Angular distribution measurements were used to assign the spin and parity of 5- to resonances at Ex = 18.82(2) and 19.67(2) MeV and 6+ at Ex = 20.80(2) MeV. The data also strongly indicate a 3- resonance at 17.32(2) MeV. The systematic uncertainty on the excitation energies is 175 keV. An R-matrix analysis has been performed for the excitation energy range 16.5 to 22 MeV. The data are discussed in terms of cluster bands in 14C. [ABSTRACT FROM AUTHOR]
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- 2014
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196. One-proton breakup of 24Si and the 23Al(p, γ)24Si reaction in type I x-ray bursts.
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Banu, A., Carstoiu, F., Achouri, N. L., Catford, W. N., Chartier, M., Fernández-Domínguez, B., Horoi, M., Laurent, B., Orr, N. A., Paschalis, S., Patterson, N., Pietras, B., Roeder, B. T., Roussel-Chomaz, P., Thomas, J. S., Trache, L., and Tribble, R. E.
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HYDROGEN , *STARS , *EXPLOSIONS , *X-ray bursts , *EFFECT of hydrogen on silicon , *ALUMINUM - Abstract
Background; To understand explosive hydrogen burning in stars and to explore various explosive scenarios such as type I x-ray bursts (XRBs), reliable reaction rates are needed. The cross sections for radiative proton capture on near-dripline nuclei are necessary for the determination of the reaction rates, but cannot be measured directly. Purpose: To determine the reaction rate for the radiative proton capture reaction 23Al(p, γ)24Si using indirect methods and, as a consequence, evaluate if sequential 2p capture on 22Mg seed nuclei is significant at high temperatures. Method: Nonresonant radiative proton capture on 23Al is investigated using the one-proton breakup of 24Si at 61 MeV/nucleon and the asymptotic normalization coefficient (ANC) for 24Sigs → 23Al + p is deduced. Results: From the ANC, the nonresonant component of the astrophysical S-factor for the 23Al(p, γ)24Si reaction is determined and, using other new experimental data the resonant component is re-evaluated. Conclusions: The 23Al(p, γ)24Si reaction is of interest for type I XRB nucleosynthesis and its reaction rate can affect both the 22Na abundance and the total energy output. New determinations of the rates for the 22Mg(p, γ)23Al(p, γ)24Si reaction chain are provided here and we point to the need that they be included in XRB scenarios. [ABSTRACT FROM AUTHOR]
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- 2012
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197. Resonances in 19Ne with relevance to the astrophysically important 18F(p,&agr;)15O reaction.
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Mountford, D. J., Murphy, A. St. J., Achouri, N. L., Angulo, C., Brown, J. R., Davinson, T., de Oliveira Santos, F., de Séréville, N., Descouvemont, P., Kamalou, O., Laird, A. M., Pittman, S. T., Ujic, P., and Woods, P. J.
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NUCLEAR reactions , *FLUORINE isotopes , *POSITRON annihilation , *NUCLEAR cross sections , *LOGICAL prediction , *INELASTIC scattering - Abstract
The most intense &ggr;-ray line observable from novae is likely to be from positron annihilation associated with the decay of l8F. The uncertainty in the destruction rate of this nucleus through the 18F(p,&agr;)l5O reaction presents a limit to interpretation of any future observed &ggr;-ray flux. Direct measurements of the cross section of both this reaction and the l8F(p,p)18F reaction have been performed between center of mass energies of 0.5 and 1.9 MeV. Simultaneous fits to both data sets with the R-matrix formalism reveal several resonances, with the inferred parameters of populated states in "Ne in general agreement with previous measurements. Of particular interest, extra strength has been observed above Ec.m. ∼1.3 MeV in the l8F(p,p)l8F reaction and between 1.3-1.7 MeV in the l8F(p,&agr;)15O reaction. This is well described by a broad l/2+ state, consistent with both a recent theoretical prediction and an inelastic scattering measurement. The astrophysical implications of a broad subthreshold partner to this state are discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
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198. Isoscalar response of 68Ni to α-particle and deuteron probes.
- Author
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Vandebrouck, M., Gibelin, J., Khan, E., Achouri, N. L., Baba, H., Beaumel, D., Blumenfeld, Y., Caamaño, M., Càceres, L., Colò, G., Delaunay, F., Fernandez-Dominguez, B., Garg, U., Grinyer, G. F., Harakeh, M. N., Kalantar-Nayestanaki, N., Keeley, N., Mittig, W., Pancin, J., and Raabe, R.
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DEUTERON scattering , *NUCLEAR matter , *ATOMIC nucleus , *QUADRUPOLES , *NICKEL isotopes - Abstract
Isoscalar giant resonances have been measured in the unstable 68Ni nucleus using inelastic alpha and deuteron scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. Using alpha scattering, the extracted isoscalar giant monopole resonance (1SGMR) centroid was determined to be 21.1 ± 1.9 MeV and the isoscalar giant quadrupole resonance (ISGQR) to be 15.9 ± 1.3 MeV. Indications for soft isoscalar monopole and dipole modes are provided. Results obtained with both (α, α') and (d, d') probes are compatible. The evolution of isoscalar giant resonances along the Ni isotopic chain from 56Ni to 68Ni is discussed [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
199. Measurement of the Isoscalar Monopole Response in the Neutron-Rich Nucleus 68Ni.
- Author
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Vandebrouck, M., Gibelin, J., Khan, E., Achouri, N. L., Baba, H., Beaumel, D., Blumenfeld, Y., Caamano, M., Càceres, L., Colö, G., Delaunay, F., Fernandez-Dominguez, B., Garg, U., Grinyer, G. F., Harakeh, M. N., Kalantar-Nayestanaki, N., Keeley, N., Mittig, W., Pancin, J., and Raabe, R.
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NEUTRONS , *KINEMATICS , *ANGULAR distribution (Nuclear physics) , *DWBA (Nuclear physics) , *INELASTIC scattering - Abstract
The isoscalar monopole response has been measured in the unstable nucleus 68Ni using inelastic alpha scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant monopole resonance (ISGMR) centroid was determined to be 21.1 ± 1.9 MeV and indications for a soft monopole mode are provided for the first time at 12.9 ± 1.0 MeV. Analysis of the corresponding angular distributions using distorted-wave-born approximation with random-phase approximation transition densities indicates that the L = 0 multipolarity dominates the cross section for the ISGMR and significantly contributes to the low-energy mode. The L = 0 part of this low-energy mode, the soft monopole mode, is dominated by neutron excitations. This demonstrates the relevance of inelastic alpha scattering in inverse kinematics in order to probe both the ISGMR and isoscalar soft modes in neutron-rich nuclei. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
200. Structure of 13Be probed via secondary-beam reactions.
- Author
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Randisi, G., Leprince, A., Falou, H. Al, Orr, N. A., Marqués, F. M., Achouri, N. L., Angélique, J. -C., Ashwood, N., Bastin, B., Bloxham, T., Brown, B. A., Catford, W. N., Curtis, N., Delaunay, F., Freer, M., de Goes Brennand, E., Haigh, P., Hanappe, F., Harlin, C., and Laurent, B.
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NUCLEAR size (Physics) , *FRAGMENTATION reactions , *PROTONS , *SPECTRUM analysis , *CYCLOTRONS - Abstract
The low-lying level structure of the unbound neutron-rich nucleus 13Be has been investigated via breakup on a carbon target of secondary beams of 14,15B at 35 MeV/nucleon. The coincident detection of the beam velocity 12Be fragments and neutrons permitted the invariant mass of the 12Be+n and 12Be+n+n systems to be reconstructed. In the case of the breakup of 15B, a very narrow structure at threshold was observed in the 12Be+n channel. Analysis of the 12Be+n+n events demonstrated that this resulted from the sequential decay of the unbound 14Be(2+) state rather than a strongly interacting s-wave virtual state in 13Be, as had been surmised in stable beam fragmentation studies. Single-proton removal from 14B was found to populate a broad low-lying structure some 0.7 MeV above the neutron-decay threshold, in addition to a less prominent feature at around 2.4 MeV. Based on the selectivity of the reaction and a comparison with (0-3)... shell-model calculations, the low-lying structure is concluded to arise from closely spaced Jp=1/2+ and 5/2+ resonances (Er=0.40±0.03 and 0.85-0.11+0.15 MeV), while the broad higher-lying feature is a second 5/2+ level (Er=2.35±0.14 MeV). Taken in conjunction with earlier studies, the results suggest that the lowest 1/2+ and 1/2- levels lie relatively close together below 1 MeV. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
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