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1. Chronology of the three-body dissociation of 8 He

Author

Laurent, Barrallier, Marqués, Francisco Miguel, Angulo Perez, Carmen, Ashwood, N.I., Borge, María José, Bouchat, Virginie, Catford, Wilton, Clarke, Nicholas, Curtis, N., Freer, Martin, Hanappe, Francis, Kinnard, V., Labiche, Marc, Materna, Thomas, McEwan, P., Nilsson, Torbjoern, Ninane, A., Normand, G., Orr, Nigel, Pain, Steven, Prokhorova, E.V., Stuttge, Louise, Timis, C.N., Laurent, Barrallier, Marqués, Francisco Miguel, Angulo Perez, Carmen, Ashwood, N.I., Borge, María José, Bouchat, Virginie, Catford, Wilton, Clarke, Nicholas, Curtis, N., Freer, Martin, Hanappe, Francis, Kinnard, V., Labiche, Marc, Materna, Thomas, McEwan, P., Nilsson, Torbjoern, Ninane, A., Normand, G., Orr, Nigel, Pain, Steven, Prokhorova, E.V., Stuttge, Louise, and Timis, C.N.

Abstract

The space and time configurations of the dissociation of 8 He into 6 He+n+n, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the n-n and 6 He-n channels are successfully described within a model that considers independent emission of neutrons from a Gaussian volume with a given lifetime. The dissociation on C target exhibits a dominant sequential decay through the ground state of 7 He, consistent with neutrons being emitted from a Gaussian volume of fm with a n-n delay in the sequential channel of 1400 400 fm/c, in agreement with the lifetime of 7 He. The lower-statistics data on Pb target correspond mainly to direct breakup, and are well described using the n-n volume measured, without any n -n delay. The validity of the phenomenological model used is discussed., SCOPUS: ar.j, DecretOANoAutActif, info:eu-repo/semantics/published

Published
2019

2. Resonances in 19Ne with relevance to the astrophysically important 18F(p,α)15O reaction

Author

Mountford, D.J. D.J., Murphy, StJ A.S.J., Davinson, Thomas, Woods, Ph P.J., Achouri, N. L., Angulo Perez, Carmen, Brown, Jonathan R D J.R., Laird, Alison, de Oliveira Santos, François, Kamalou, Omar, Ujic, Predrag, de Séréville, Nicolas, Descouvemont, Pierre, Pittman, S.T. S.T., Mountford, D.J. D.J., Murphy, StJ A.S.J., Davinson, Thomas, Woods, Ph P.J., Achouri, N. L., Angulo Perez, Carmen, Brown, Jonathan R D J.R., Laird, Alison, de Oliveira Santos, François, Kamalou, Omar, Ujic, Predrag, de Séréville, Nicolas, Descouvemont, Pierre, and Pittman, S.T. S.T.

Abstract

The most intense γ-ray line observable from novae is likely to be from positron annihilation associated with the decay of 18F. The uncertainty in the destruction rate of this nucleus through the 18F(p,α)15O reaction presents a limit to interpretation of any future observed γ-ray flux. Direct measurements of the cross section of both this reaction and the 18F(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 19Ne in general agreement with previous measurements. Of particular interest, extra strength has been observed above E c.m.∼1.3 MeV in the 18F(p,p)18F reaction and between 1.3-1.7 MeV in the 18F(p,α)15O reaction. This is well described by a broad 1/2 + 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. © 2012 American Physical Society., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2012

3. Resonances in 19Ne with relevance to the astrophysically important 18F(p,α)15O reaction

Author

Mountford, D.J. D.J., Kamalou, Omar, Ujic, Predrag, de Séréville, Nicolas, Descouvemont, Pierre, Pittman, S.T. S.T., Murphy, StJ A.S.J., Davinson, Thomas, Woods, Ph P.J., Achouri, N. L., Angulo Perez, Carmen, Brown, Jonathan R D J.R., Laird, Alison, de Oliveira Santos, François, Mountford, D.J. D.J., Kamalou, Omar, Ujic, Predrag, de Séréville, Nicolas, Descouvemont, Pierre, Pittman, S.T. S.T., Murphy, StJ A.S.J., Davinson, Thomas, Woods, Ph P.J., Achouri, N. L., Angulo Perez, Carmen, Brown, Jonathan R D J.R., Laird, Alison, and de Oliveira Santos, François

Abstract

The main source of gamma ray emission from novae below 511 keV is likely to be associated with the β+ decay of 18F. The main uncertainty in the abundance of this nucleus comes from the 18F(p,α)15O reaction. In 2006, through microscopic techniques, two previously unseen energy levels in the compound 19Ne nucleus, at 6 and 7.9 MeV were proposed by Dufour and Descouvemont. In light of this there have been two published attempts in the search for the higher of these states, by Murphy et al. and Dalouzy et al. The aim of this work is to address the contradiction between these works and come to a conclusion as to the possible existence of this state. An experiment has taken place that utilised a 4 MeV/u 18F beam, degraded to ∼1.9 MeV/u, incident upon a thick CH2 target. The data has been analysed within the R-matrix formalism and preliminary results are presented here., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2011

4. Reply to 'comment on 'Low-energy F18(p,α)O15 cross section measurements relevant to nova γ-ray emission''

Author

de Séréville, Nicolas, Hammache, Fairouz, Stefan, Iulian Gh, Angulo Perez, Carmen, Leleux, Pierre, Coc, Alain, Kiener, Jürgen, Lefebvre-Schuhl, A., Tatischeff, Vincent, Achouri, N. L., Orr, Nigel, Casarejos, Enrique, Davinson, Thomas, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Fox, Simon, Laird, Alison, Mumby-Croft, Paul, Vaughan, Kelly, de Séréville, Nicolas, Hammache, Fairouz, Stefan, Iulian Gh, Angulo Perez, Carmen, Leleux, Pierre, Coc, Alain, Kiener, Jürgen, Lefebvre-Schuhl, A., Tatischeff, Vincent, Achouri, N. L., Orr, Nigel, Casarejos, Enrique, Davinson, Thomas, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Fox, Simon, Laird, Alison, Mumby-Croft, Paul, and Vaughan, Kelly

Abstract

SCOPUS: no.j, info:eu-repo/semantics/published

Published
2010

5. Simultaneous measurement of the 18F(p,p)18F and 18F(p, )15O reactions: Implications for the level structure of 19Ne, and for 18F production in novae

Author

Murphy, A. St J., Laird, Alison, Angulo Perez, Carmen, Buchmann, Lothar R., Davinson, Thomas, Descouvemont, Pierre, Fox, Simon, José, J., Ruiz, Rubén, Vaughan, Kelly, Walden, Patrick L., Murphy, A. St J., Laird, Alison, Angulo Perez, Carmen, Buchmann, Lothar R., Davinson, Thomas, Descouvemont, Pierre, Fox, Simon, José, J., Ruiz, Rubén, Vaughan, Kelly, and Walden, Patrick L.

Abstract

info:eu-repo/semantics/published

Published
2009

6. Low-energy 18F(p, alpha)15O cross section measurements relevant to nova gamma-ray emission

Author

de Séréville, Nicolas, Angulo Perez, Carmen, Coc, Alain, Achouri, N. L., Casarejos, Enrique, Davinson, Thomas, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Fox, Simon, Hammache, Fairouz, Kiener, Jürgen, Laird, Alison, Lefebvre-Schuhl, A., Leleux, Pol, Mumby-Croft, Paul, Orr, Nigel, Stefan, Iulian Gh, Vaughan, Kelly, Tatischeff, Vincent, de Séréville, Nicolas, Angulo Perez, Carmen, Coc, Alain, Achouri, N. L., Casarejos, Enrique, Davinson, Thomas, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Fox, Simon, Hammache, Fairouz, Kiener, Jürgen, Laird, Alison, Lefebvre-Schuhl, A., Leleux, Pol, Mumby-Croft, Paul, Orr, Nigel, Stefan, Iulian Gh, Vaughan, Kelly, and Tatischeff, Vincent

Abstract

info:eu-repo/semantics/published

Published
2009

7. Simultaneous measurement of the 18F(p,p)18F and 18F(p, )15O reactions: Implications for the level structure of 19Ne, and for 18F production in novae

Author

Murphy, A. St J., Laird, Alison, Angulo Perez, Carmen, Buchmann, Lothar R., Davinson, Thomas, Descouvemont, Pierre, Fox, Simon, José, J., Ruiz, Rubén, Vaughan, Kelly, Walden, Patrick L., Murphy, A. St J., Laird, Alison, Angulo Perez, Carmen, Buchmann, Lothar R., Davinson, Thomas, Descouvemont, Pierre, Fox, Simon, José, J., Ruiz, Rubén, Vaughan, Kelly, and Walden, Patrick L.

Abstract

info:eu-repo/semantics/published

Published
2009

8. Low-energy 18F(p, alpha)15O cross section measurements relevant to nova gamma-ray emission

Author

de Séréville, Nicolas, Angulo Perez, Carmen, Coc, Alain, Achouri, N. L., Casarejos, Enrique, Davinson, Thomas, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Fox, Simon, Hammache, Fairouz, Kiener, Jürgen, Laird, Alison, Lefebvre-Schuhl, A., Leleux, Pol, Mumby-Croft, Paul, Orr, Nigel, Stefan, Iulian Gh, Vaughan, Kelly, Tatischeff, Vincent, de Séréville, Nicolas, Angulo Perez, Carmen, Coc, Alain, Achouri, N. L., Casarejos, Enrique, Davinson, Thomas, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Fox, Simon, Hammache, Fairouz, Kiener, Jürgen, Laird, Alison, Lefebvre-Schuhl, A., Leleux, Pol, Mumby-Croft, Paul, Orr, Nigel, Stefan, Iulian Gh, Vaughan, Kelly, and Tatischeff, Vincent

Abstract

info:eu-repo/semantics/published

Published
2009

9. Evidence for core excitation in single-particle states of 19Na

Author

Pellegriti, Maria Grazia, Achouri, N. L., Angulo Perez, Carmen, Angelique, J.-C., Berthoumieux, Eric, Casarejos, Enrique, Couder, Manoël, Davinson, Thomas, Ghag, C., Murphy, A. St J., Orr, Nigel, Ray, I., Stefan, Iulian Gh, Descouvemont, Pierre, Pellegriti, Maria Grazia, Achouri, N. L., Angulo Perez, Carmen, Angelique, J.-C., Berthoumieux, Eric, Casarejos, Enrique, Couder, Manoël, Davinson, Thomas, Ghag, C., Murphy, A. St J., Orr, Nigel, Ray, I., Stefan, Iulian Gh, and Descouvemont, Pierre

Abstract

We present an experimental study of 19Na states in the excitation energy range between 2 and 3 MeV. The presence of 19Na single-particle levels at these energies was first predicted by a microscopic cluster model and then experimentally confirmed by measuring the elastic and inelastic scattering of a 66 MeV 18Ne radioactive beam on a (CH2)n target. The H(18Ne, p)18Ne(g.s.) and H(18Ne, p′)18Ne*(2+, 1.887 MeV) cross sections have been obtained in the laboratory angular range θlab = 6.1 ° - 18.4 ° and analyzed by using the R-matrix method. Two new states in 19Na have been observed at centre-of-mass energies Ec .m .= 2.78 ± 0.01 MeV and 3.09 ± 0.05 MeV. Both resonances exhibit large widths in the 18Ne (2+) + p channel, and low branching ratios into the elastic channel. The reduced proton widths confirm the single-particle nature of these states, with a 18Ne (2+) + p structure. © 2007 Elsevier B.V. All rights reserved., info:eu-repo/semantics/published

Published
2008

11. Experimental study of the charge symmetry of the nucleus-nucleus potential with medium mass mirror elastic collisions

Author

5th International Conference on Exotic Nuclei and Atomic Masses (7-13 September 2008: Ryn, Poland), Sanchez-Benitez, A., Angulo Perez, Carmen, Acosta, L., Ashwood, N., Baye, Daniel Jean, Casarejos, Enrique, Curtis, N., Descouvemont, Pierre, Keutgen, T., Martel, I., Murphy, A. St J., Rusek, K., Schweitzer, Jeffrey S., Scuderi, V., Sparenberg, Jean-Marc, Spillane, T., Terwagne, Guy, 5th International Conference on Exotic Nuclei and Atomic Masses (7-13 September 2008: Ryn, Poland), Sanchez-Benitez, A., Angulo Perez, Carmen, Acosta, L., Ashwood, N., Baye, Daniel Jean, Casarejos, Enrique, Curtis, N., Descouvemont, Pierre, Keutgen, T., Martel, I., Murphy, A. St J., Rusek, K., Schweitzer, Jeffrey S., Scuderi, V., Sparenberg, Jean-Marc, Spillane, T., and Terwagne, Guy

Abstract

info:eu-repo/semantics/nonPublished

Published
2008

12. Experimental study of the charge symmetry of the nucleus-nucleus potential with medium mass mirror elastic collisions

Author

5th International Conference on Exotic Nuclei and Atomic Masses (7-13 September 2008: Ryn, Poland), Sanchez-Benitez, A., Angulo Perez, Carmen, Acosta, L., Ashwood, N., Baye, Daniel Jean, Casarejos, Enrique, Curtis, N., Descouvemont, Pierre, Keutgen, T., Martel, I., Murphy, A. St J., Rusek, K., Schweitzer, Jeffrey S., Scuderi, V., Sparenberg, Jean-Marc, Spillane, T., Terwagne, Guy, 5th International Conference on Exotic Nuclei and Atomic Masses (7-13 September 2008: Ryn, Poland), Sanchez-Benitez, A., Angulo Perez, Carmen, Acosta, L., Ashwood, N., Baye, Daniel Jean, Casarejos, Enrique, Curtis, N., Descouvemont, Pierre, Keutgen, T., Martel, I., Murphy, A. St J., Rusek, K., Schweitzer, Jeffrey S., Scuderi, V., Sparenberg, Jean-Marc, Spillane, T., and Terwagne, Guy

Abstract

info:eu-repo/semantics/nonPublished

Published
2008

14. New low-energy measurement of the 18F(p,α)15O reaction

Author

de Séréville, Nicolas, Angulo Perez, Carmen, Coc, Alain, Achouri, N. L., Casarejos, Enrique, Davinson, Thomas, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Fox, Simon, Hammache, Fairouz, Kiener, Jürgen, Laird, Alison, Lefebvre-Schuhl, A., Leleux, Pol, Mumby-Croft, Paul, Orr, Nigel, Robertson, Donald, Vaughan, Kelly, Tatischeff, Vincent, de Séréville, Nicolas, Angulo Perez, Carmen, Coc, Alain, Achouri, N. L., Casarejos, Enrique, Davinson, Thomas, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Fox, Simon, Hammache, Fairouz, Kiener, Jürgen, Laird, Alison, Lefebvre-Schuhl, A., Leleux, Pol, Mumby-Croft, Paul, Orr, Nigel, Robertson, Donald, Vaughan, Kelly, and Tatischeff, Vincent

Abstract

SCOPUS: cp.j, info:eu-repo/semantics/published

Published
2007

15. Observation of 19Na states by inelastic scattering

Author

Pellegriti, Maria Grazia, Achouri, N. L., Angulo Perez, Carmen, Angélique, Jean Claude, Berthoumieux, Eric, Casarejos, Enrique, Couder, Manoël, Davinson, Thomas, Descouvemont, Pierre, Ghag, C., Murphy, A. St J., Orr, Nigel, Ray, I., Stefan, Iulian Gh, Pellegriti, Maria Grazia, Achouri, N. L., Angulo Perez, Carmen, Angélique, Jean Claude, Berthoumieux, Eric, Casarejos, Enrique, Couder, Manoël, Davinson, Thomas, Descouvemont, Pierre, Ghag, C., Murphy, A. St J., Orr, Nigel, Ray, I., and Stefan, Iulian Gh

Abstract

SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2007

16. Direct measurement of the 18F(p,a)15O reaction for application to nova y-ray emission

Author

de Séréville, Nicolas, Angulo Perez, Carmen, Leleux, Pol, Coc, Alain, Kiener, Jürgen, Lefebvre-Schuhl, A., Tatischeff, Vincent, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Hammache, Fairouz, Achouri, Lynda, Orr, Nigel, Stefan, Iulian Gh, Casarejos, Enrique, Davinson, Thomas, Robertson, Donald, Laird, Alison, Fox, Simon, Mumby-Croft, Paul, Vaughan, Kelly, de Séréville, Nicolas, Angulo Perez, Carmen, Leleux, Pol, Coc, Alain, Kiener, Jürgen, Lefebvre-Schuhl, A., Tatischeff, Vincent, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Hammache, Fairouz, Achouri, Lynda, Orr, Nigel, Stefan, Iulian Gh, Casarejos, Enrique, Davinson, Thomas, Robertson, Donald, Laird, Alison, Fox, Simon, Mumby-Croft, Paul, and Vaughan, Kelly

Abstract

info:eu-repo/semantics/published

Published
2007

17. Direct measurement of the 18F(p,a)15O reaction for application to nova y-ray emission

Author

de Séréville, Nicolas, Angulo Perez, Carmen, Leleux, Pol, Coc, Alain, Kiener, Jürgen, Lefebvre-Schuhl, A., Tatischeff, Vincent, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Hammache, Fairouz, Achouri, Lynda, Orr, Nigel, Stefan, Iulian Gh, Casarejos, Enrique, Davinson, Thomas, Robertson, Donald, Laird, Alison, Fox, Simon, Mumby-Croft, Paul, Vaughan, Kelly, de Séréville, Nicolas, Angulo Perez, Carmen, Leleux, Pol, Coc, Alain, Kiener, Jürgen, Lefebvre-Schuhl, A., Tatischeff, Vincent, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Hammache, Fairouz, Achouri, Lynda, Orr, Nigel, Stefan, Iulian Gh, Casarejos, Enrique, Davinson, Thomas, Robertson, Donald, Laird, Alison, Fox, Simon, Mumby-Croft, Paul, and Vaughan, Kelly

Abstract

info:eu-repo/semantics/published

Published
2007

18. Observation of 19Na states by inelastic scattering

Author

Pellegriti, Maria Grazia, Achouri, N. L., Angulo Perez, Carmen, Angélique, Jean Claude, Berthoumieux, Eric, Casarejos, Enrique, Couder, Manoël, Davinson, Thomas, Descouvemont, Pierre, Ghag, C., Murphy, A. St J., Orr, Nigel, Ray, I., Stefan, Iulian Gh, Pellegriti, Maria Grazia, Achouri, N. L., Angulo Perez, Carmen, Angélique, Jean Claude, Berthoumieux, Eric, Casarejos, Enrique, Couder, Manoël, Davinson, Thomas, Descouvemont, Pierre, Ghag, C., Murphy, A. St J., Orr, Nigel, Ray, I., and Stefan, Iulian Gh

Abstract

SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2007

19. Direct measurement of the 18F(p,α)15O reaction for application to nova γ-ray emission

Author

de Séréville, Nicolas, Angulo Perez, Carmen, Leleux, Pierre, Coc, Alain, Kiener, Jürgen, Lefebvre, Anne, Tatischeff, Vincent, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Hammache, Fairouz, Achouri, Lynda, Orr, Nigel, Stefan, Iulian Gh, Casajeros, Enrique, Davinson, Thomas, Robertson, Douglas, Laird, Alison, Fox, Simon, Mumby-Croft, Paul, Vaughan, Kelly, de Séréville, Nicolas, Angulo Perez, Carmen, Leleux, Pierre, Coc, Alain, Kiener, Jürgen, Lefebvre, Anne, Tatischeff, Vincent, Descouvemont, Pierre, Figuera, Pierpaolo Paolo, Hammache, Fairouz, Achouri, Lynda, Orr, Nigel, Stefan, Iulian Gh, Casajeros, Enrique, Davinson, Thomas, Robertson, Douglas, Laird, Alison, Fox, Simon, Mumby-Croft, Paul, and Vaughan, Kelly

Abstract

The 18F nucleus is one of the radioactive isotopes produced during nova explosions. It is of particular interest since it is mainly responsible for the 511 keV gamma-ray emission of novae that could be detected with the INTEGRAL satellite or future gamma-ray telescopes. The amount of 18F synthesised still suffers from large uncertainties coming from missing nuclear information concerning the 18F destruction reaction 18F(p,α) 15O. In particular, the interference sign between three 3/2+ resonances in 19Ne, situated slightly above the proton threshold (8 keV and/or 38 keV) and at higher energy (665 keV), is unknown. The maximum effect of these interferences is lying in the energy range corresponding to the Gamow peak region and has a strong impact on the 18F(p, α)15O reaction rate. We report here on the direct measurement at low energy (down to 400 keV in the center-of-mass) of the 18F(p, α)15O total cross section that we performed at the Louvain-la-Neuve CRC-RIB facility with the high-intensity and -purity 18F radioactive beam (T 1/2 = 110 min). The total cross section for the different incident energies will be presented and compared to previous experimental data. Copyright owned by the author(s)., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2006

20. Spectroscopy of the proton drip-line nucleus 19Na by resonant elastic and inelastic scattering

Author

Achouri, N. L., Angulo Perez, Carmen, Angelique, J.-C., Berthoumieux, Eric, Casarejos, Enrique, Couder, Manoël, Davinson, Thomas, Descouvemont, Pierre, Ghag, G., Murphy, A. St J., Orr, Nigel, Ray, I., Stefan, Iulian Gh, Achouri, N. L., Angulo Perez, Carmen, Angelique, J.-C., Berthoumieux, Eric, Casarejos, Enrique, Couder, Manoël, Davinson, Thomas, Descouvemont, Pierre, Ghag, G., Murphy, A. St J., Orr, Nigel, Ray, I., and Stefan, Iulian Gh

Abstract

Low-lying states of 19Na were investigated using both elastic and inelastic scattering of a 18Ne beam on a (CH2) n target. The experimental method is briefly described. Preliminary results are presented., info:eu-repo/semantics/published

Published
2006

22. Low-energy states in 11N and the two-proton emission of 12O

Author

Angulo Perez, Carmen, Casarejos, Enrique, Demaret, Paul Marcel, Gaelens, Michel, Leleux, Pol, Loiselet, Marc, Ninane, A., Ryckeweart, G., Vanderbist, Francis, Aliotta, M., Davinson, Thomas, Liu, Zhenan, Murphy, A. St J., Roberts, I. A., Woods, Philippe J., Schweitzer, Jeffrey S., Barker, Frederick C., Descouvemont, Pierre, Angulo Perez, Carmen, Casarejos, Enrique, Demaret, Paul Marcel, Gaelens, Michel, Leleux, Pol, Loiselet, Marc, Ninane, A., Ryckeweart, G., Vanderbist, Francis, Aliotta, M., Davinson, Thomas, Liu, Zhenan, Murphy, A. St J., Roberts, I. A., Woods, Philippe J., Schweitzer, Jeffrey S., Barker, Frederick C., and Descouvemont, Pierre

Abstract

info:eu-repo/semantics/published

Published
2006

23. Low-lying states in the unbound 11N nucleus

Author

Casarejos, Enrique, Angulo Perez, Carmen, Woods, Philippe J., Barker, Frederick C., Descouvemont, Pierre, Aliotta, M., Davinson, Thomas, Gaelens, Michel, Leleux, Pol, Liu, Zhenan, Loiselet, Marc, Murphy, A. St J., Ninane, A., Roberts, I. A., Ryckeweart, G., Schweitzer, Jeffrey S., Vanderbist, Francis, Casarejos, Enrique, Angulo Perez, Carmen, Woods, Philippe J., Barker, Frederick C., Descouvemont, Pierre, Aliotta, M., Davinson, Thomas, Gaelens, Michel, Leleux, Pol, Liu, Zhenan, Loiselet, Marc, Murphy, A. St J., Ninane, A., Roberts, I. A., Ryckeweart, G., Schweitzer, Jeffrey S., and Vanderbist, Francis

Abstract

info:eu-repo/semantics/published

Published
2006

24. A first experimental approach to the 15O + a elastic scattering

Author

Vanderbist, Francis, Leleux, Pol, Angulo Perez, Carmen, Casarejos, Enrique, Couder, Manoël, Loiselet, Marc, Ryckeweart, G., Descouvemont, Pierre, Aliotta, M., Davinson, Thomas, Liu, Zhenan, Woods, Philippe J., Vanderbist, Francis, Leleux, Pol, Angulo Perez, Carmen, Casarejos, Enrique, Couder, Manoël, Loiselet, Marc, Ryckeweart, G., Descouvemont, Pierre, Aliotta, M., Davinson, Thomas, Liu, Zhenan, and Woods, Philippe J.

Abstract

info:eu-repo/semantics/published

Published
2006

25. Low-lying states in the unbound 11N nucleus

Author

Casarejos, Enrique, Angulo Perez, Carmen, Woods, Philippe J., Barker, Frederick C., Descouvemont, Pierre, Aliotta, M., Davinson, Thomas, Gaelens, Michel, Leleux, Pol, Liu, Zhenan, Loiselet, Marc, Murphy, A. St J., Ninane, A., Roberts, I. A., Ryckeweart, G., Schweitzer, Jeffrey S., Vanderbist, Francis, Casarejos, Enrique, Angulo Perez, Carmen, Woods, Philippe J., Barker, Frederick C., Descouvemont, Pierre, Aliotta, M., Davinson, Thomas, Gaelens, Michel, Leleux, Pol, Liu, Zhenan, Loiselet, Marc, Murphy, A. St J., Ninane, A., Roberts, I. A., Ryckeweart, G., Schweitzer, Jeffrey S., and Vanderbist, Francis

Abstract

info:eu-repo/semantics/published

Published
2006

26. Low-energy states in 11N and the two-proton emission of 12O

Author

Angulo Perez, Carmen, Casarejos, Enrique, Demaret, Paul Marcel, Gaelens, Michel, Leleux, Pol, Loiselet, Marc, Ninane, A., Ryckeweart, G., Vanderbist, Francis, Aliotta, M., Davinson, Thomas, Liu, Zhenan, Murphy, A. St J., Roberts, I. A., Woods, Philippe J., Schweitzer, Jeffrey S., Barker, Frederick C., Descouvemont, Pierre, Angulo Perez, Carmen, Casarejos, Enrique, Demaret, Paul Marcel, Gaelens, Michel, Leleux, Pol, Loiselet, Marc, Ninane, A., Ryckeweart, G., Vanderbist, Francis, Aliotta, M., Davinson, Thomas, Liu, Zhenan, Murphy, A. St J., Roberts, I. A., Woods, Philippe J., Schweitzer, Jeffrey S., Barker, Frederick C., and Descouvemont, Pierre

Abstract

info:eu-repo/semantics/published

Published
2006

28. A first experimental approach to the 15O + a elastic scattering

Author

Vanderbist, Francis, Leleux, Pol, Angulo Perez, Carmen, Casarejos, Enrique, Couder, Manoël, Loiselet, Marc, Ryckeweart, G., Descouvemont, Pierre, Aliotta, M., Davinson, Thomas, Liu, Zhenan, Woods, Philippe J., Vanderbist, Francis, Leleux, Pol, Angulo Perez, Carmen, Casarejos, Enrique, Couder, Manoël, Loiselet, Marc, Ryckeweart, G., Descouvemont, Pierre, Aliotta, M., Davinson, Thomas, Liu, Zhenan, and Woods, Philippe J.

Abstract

info:eu-repo/semantics/published

Published
2006

29. Spectroscopy of the proton drip-line nucleus 19Na by resonant elastic and inelastic scattering

Author

Achouri, N. L., Angulo Perez, Carmen, Angelique, J.-C., Berthoumieux, Eric, Casarejos, Enrique, Couder, Manoël, Davinson, Thomas, Descouvemont, Pierre, Ghag, G., Murphy, A. St J., Orr, Nigel, Ray, I., Stefan, Iulian Gh, Achouri, N. L., Angulo Perez, Carmen, Angelique, J.-C., Berthoumieux, Eric, Casarejos, Enrique, Couder, Manoël, Davinson, Thomas, Descouvemont, Pierre, Ghag, G., Murphy, A. St J., Orr, Nigel, Ray, I., and Stefan, Iulian Gh

Abstract

Low-lying states of 19Na were investigated using both elastic and inelastic scattering of a 18Ne beam on a (CH2) n target. The experimental method is briefly described. Preliminary results are presented., info:eu-repo/semantics/published

Published
2006

30. Correlation studies of the H5 spectrum

Author

Golovkov, M.S., Grigorenko, Leonid, Fomichev, Andrey, Krupko, S.A., Oganessian, Yu.Ts., Rodin, AM, Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Ter-Akopian, Gurgen, Wolski, Roman, Itkis, Mikhail, Denikin, A. S., Bogatchev, A.A., Kondratiev, N.A., Kozulin, E.M., Korsheninnikov, A.A., Nikolskii, Yu, Roussel-Chomaz, Patricia, Mittig, Wolfgang, Palit, Rudrajyoti, Bouchat, Virginie, Kinnard, V., Materna, Thomas, Hanappe, Francis, Dorvaux, O., Stuttge, Louise, Angulo Perez, Carmen, Lapoux, Valerie, Raabe, Riccardo, Nalpas, L., Yukhimchuk, Arkadiy, Perevozchikov, V.V., Vinogradov, Yu, Grishechkin, S.K., Zlatoustovskiy, S.V., Golovkov, M.S., Grigorenko, Leonid, Fomichev, Andrey, Krupko, S.A., Oganessian, Yu.Ts., Rodin, AM, Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Ter-Akopian, Gurgen, Wolski, Roman, Itkis, Mikhail, Denikin, A. S., Bogatchev, A.A., Kondratiev, N.A., Kozulin, E.M., Korsheninnikov, A.A., Nikolskii, Yu, Roussel-Chomaz, Patricia, Mittig, Wolfgang, Palit, Rudrajyoti, Bouchat, Virginie, Kinnard, V., Materna, Thomas, Hanappe, Francis, Dorvaux, O., Stuttge, Louise, Angulo Perez, Carmen, Lapoux, Valerie, Raabe, Riccardo, Nalpas, L., Yukhimchuk, Arkadiy, Perevozchikov, V.V., Vinogradov, Yu, Grishechkin, S.K., and Zlatoustovskiy, S.V.

Abstract

The nuclear system H5 was studied using the H3(t,p)H5 transfer reaction at a laboratory energy of 57.7 MeV and small center of mass angles. The energy and angular correlations among the H5 decay fragments were obtained by complete kinematical reconstruction. A broad structure in the H5 missing mass spectrum above 2.5 MeV with a typical width of several MeV was identified as a mixture of 3/2+ and 5/2+ states. Analysis of interference patterns observed in the measured angular correlations disclosed the 1/2+ ground state of H5 concealed in the smooth missing mass spectrum. The deduced values for the resonance energy and width are Eg.s. 1.8 MeV and Γg.s. 1.3 MeV. The estimated cross sections for population of the ground state and the doublet of excited states at θc.m.=5°-10° are 150±50 μb/sr and 4.6±2 mb/sr, respectively. © 2005 The American Physical Society., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2005

31. Recent result of the 14N(p,Y)15O mesasurement at LUNA

Author

Costantini, H., Angulo Perez, Carmen, Bemmerer, D., Bonetti, R., Broggini, C., Confortola, F., Corvisiero, P., Cruz, J., Descouvemont, Pierre, Formicola, A., Costantini, H., Angulo Perez, Carmen, Bemmerer, D., Bonetti, R., Broggini, C., Confortola, F., Corvisiero, P., Cruz, J., Descouvemont, Pierre, and Formicola, A.

Abstract

The 14N(p, γ)15O reaction has been investigated by LUNA at the National Laboratory of Gran Sasso (LNGS) using two different techniques. The first study has been performed using a solid target and detecting the γ-rays coming from the single transitions with a HPGe detector in very close geometry to the target. In a second phase a windowless gas target sorrounded by a nearly 4π BGO summing crystal has been used and the total S-factor has been measured down to Eb = 80 keV. © 2005 Elsevier B.V. All rights reserved., info:eu-repo/semantics/published, Nuclei in the Cosmos VIII. Proceedings, 8th International Symposium on Nuclei in the Cosmos, Vancouver, Canada, 19-23 July 2004, edited by L. Buchmann, M. Comyn and J. Thomson

Published
2005

32. Big Bang nucleosynthesis, microwave anisotropy, and the light element abundances

Author

Coc, Alain, Angulo Perez, Carmen, Vangioni-Flam, Elisabeth, Descouvemont, Pierre, Adahchour, Abderrahim, Coc, Alain, Angulo Perez, Carmen, Vangioni-Flam, Elisabeth, Descouvemont, Pierre, and Adahchour, Abderrahim

Abstract

From the observations of the anisotropies of the Cosmic Microwave Background (CMB) radiation, the WMAP satellite has provided a determination of the baryonic density of the Universe, with an unprecedented precision: 4%. This imposes a careful reanalysis of the standard Big-Bang Nucleosynthesis (SBBN) calculations. In a recent paper, we used the R-matrix theory to fit S-factor data on nuclear reactions involved in Big Bang nucleosynthesis. We derived the reaction rates with associated uncertainties, which were evaluated on statistical grounds (available at http://pntpm3.ulb.ac.be/bigbang). Combining these BBN results with the Ωbh2 value from WMAP, we deduced the light element (4He, D, 3He and 7Li) primordial abundances and compare them with spectroscopic observations. There is a very good agreement with deuterium observed in cosmological clouds, which strengthens the confidence on the estimated baryonic density of the Universe. However, there is a discrepancy between the deduced 7Li abundance and the one observed in halo stars of our Galaxy, supposed, until now, to represent the primordial abundance of this isotope. The origin of this discrepancy, observational, nuclear or more fundamental remains to be clarified. The possible role of the up to now neglected 7Be(d,p)2α and 7Be(d,α)5Li reactions is considered and we present here a dedicated experiment performed at Louvain-la-Neuve to measure these cross sections. © 2005 Elsevier B.V. All rights reserved., info:eu-repo/semantics/published, Proceedings of the 22nd International Nuclear Physics Conference (Part 2), edited by B. Jonson, M. Meister, G. Nyman and M. Zhukov

Published
2005

33. New insights into the resonance states of 5H and 5He

Author

Ter-Akopian, Gurgen, Fomichev, Andrey, Golovkov, M.S., Grigorenko, Leonid, Krupko, S.A., Oganessian, Yu.Ts., Rodin, AM, Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Wolski, Roman, Korsheninnikov, A.A., Nikolskii, Yu, Roussel-Chomaz, Patricia, Mittig, Wolfgang, Palit, Rudrajyoti, Bouchat, Virginie, Kinnard, V., Materna, Thomas, Hanappe, Francis, Dorvaux, O., Stuttge, Louise, Angulo Perez, Carmen, Lapoux, Valerie, Raabe, Riccardo, Nalpas, L., Yukhimchuk, Arkadiy, Perevozchikov, V.V., Vinogradov, Yu, Grishechkin, S.K., Zlatoustovskiy, S.V., Ter-Akopian, Gurgen, Fomichev, Andrey, Golovkov, M.S., Grigorenko, Leonid, Krupko, S.A., Oganessian, Yu.Ts., Rodin, AM, Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Wolski, Roman, Korsheninnikov, A.A., Nikolskii, Yu, Roussel-Chomaz, Patricia, Mittig, Wolfgang, Palit, Rudrajyoti, Bouchat, Virginie, Kinnard, V., Materna, Thomas, Hanappe, Francis, Dorvaux, O., Stuttge, Louise, Angulo Perez, Carmen, Lapoux, Valerie, Raabe, Riccardo, Nalpas, L., Yukhimchuk, Arkadiy, Perevozchikov, V.V., Vinogradov, Yu, Grishechkin, S.K., and Zlatoustovskiy, S.V.

Abstract

The 5H system was produced in the 3H(t, p) 5H reaction studied at small CM angles with a 58MeV tritium ion beam. High statistics data were used to reconstruct the energy and angular correlations between the 5H decay fragments. A broad structure in the 5H missing-mass spectrum showing up above 2.5MeV was identified as a mixture of the 3/2+ and 5/2+ states. The data also present an evidence that the 1/2+ ground state of 5H is located at about 2MeV. Then, the 5H and 5He systems were explored by means of transfer reactions occurring in the interactions of 132MeV 6He beam nuclei with deuterium. In the 2H( 6He, 3H) reaction a T = 3/2 isobaric analog state of 5H in 5He was observed at an excitation energy of 22.0±0.3MeV with a width of 2.5±0.3MeV. © Società Italiana di Fisica / Springer-Verlag 2005., SCOPUS: cp.j, info:eu-repo/semantics/published

Published
2005

34. Big Bang reaction rates within the R-matrix model

Author

Descouvemont, Pierre, Adahchour, Abderrahim, Angulo Perez, Carmen, Coc, Alain, Vangioni-Flam, Elisabeth, Descouvemont, Pierre, Adahchour, Abderrahim, Angulo Perez, Carmen, Coc, Alain, and Vangioni-Flam, Elisabeth

Abstract

We use the R-matrix theory to fit S-factor data on nuclear reactions involved in Big Bang nucleosynthesis. We derive the reaction rates with associated uncertainties, which are evaluated on statistical grounds. We provide S factors and reaction rates in tabular and graphical formats (available at http://pntpm3.ulb.ac.be/bigbang). © 2005 Elsevier B.V. All rights reserved., info:eu-repo/semantics/published, Nuclei in the Cosmos VIII. Proceedings, 8th International Symposium on Nuclei in the Cosmos, Vancouver, Canada, 19-23 July 2004, edited by L. Buchmann, M. Comyn and J. Thomson

Published
2005

35. S-factor of 14N(p,Y)15O at astrophysical energies

Author

Imbriana, G., Costantini, H., Formicola, A., Vomiero, A., Angulo Perez, Carmen, Bemmerer, D., Bonetti, R., Broggini, C., Confortola, F., Corvisiero, P., Cruz, J., Descouvemont, Pierre, Fulop, Zsolt, Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, Gy, Jesus, A. P., Junker, Matthias, Klug, J. N., Lemut, A., Menegazzo, R., Prati, R., Roca, V., Rolfs, Claus, Romano, M., lvarez, C., Schümann, F., Schürmann, D., Somorjai, Endre, Straniero, O., Strieder, Frank, Terrasi, F., Trauvetter, H. P., Imbriana, G., Costantini, H., Formicola, A., Vomiero, A., Angulo Perez, Carmen, Bemmerer, D., Bonetti, R., Broggini, C., Confortola, F., Corvisiero, P., Cruz, J., Descouvemont, Pierre, Fulop, Zsolt, Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, Gy, Jesus, A. P., Junker, Matthias, Klug, J. N., Lemut, A., Menegazzo, R., Prati, R., Roca, V., Rolfs, Claus, Romano, M., lvarez, C., Schümann, F., Schürmann, D., Somorjai, Endre, Straniero, O., Strieder, Frank, Terrasi, F., and Trauvetter, H. P.

Abstract

info:eu-repo/semantics/published

Published
2005

36. S-factor of 14N(p,Y)15O at astrophysical energies

Author

Imbriana, G., Costantini, H., Formicola, A., Vomiero, A., Angulo Perez, Carmen, Bemmerer, D., Bonetti, R., Broggini, C., Confortola, F., Corvisiero, P., Cruz, J., Descouvemont, Pierre, Fulop, Zsolt, Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, Gy, Jesus, A. P., Junker, Matthias, Klug, J. N., Lemut, A., Menegazzo, R., Prati, R., Roca, V., Rolfs, Claus, Romano, M., lvarez, C., Schümann, F., Schürmann, D., Somorjai, Endre, Straniero, O., Strieder, Frank, Terrasi, F., Trauvetter, H. P., Imbriana, G., Costantini, H., Formicola, A., Vomiero, A., Angulo Perez, Carmen, Bemmerer, D., Bonetti, R., Broggini, C., Confortola, F., Corvisiero, P., Cruz, J., Descouvemont, Pierre, Fulop, Zsolt, Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, Gy, Jesus, A. P., Junker, Matthias, Klug, J. N., Lemut, A., Menegazzo, R., Prati, R., Roca, V., Rolfs, Claus, Romano, M., lvarez, C., Schümann, F., Schürmann, D., Somorjai, Endre, Straniero, O., Strieder, Frank, Terrasi, F., and Trauvetter, H. P.

Abstract

info:eu-repo/semantics/published

Published
2005

37. Big Bang reaction rates within the R-matrix model

Author

Descouvemont, Pierre, Adahchour, Abderrahim, Angulo Perez, Carmen, Coc, Alain, Vangioni-Flam, Elisabeth, Descouvemont, Pierre, Adahchour, Abderrahim, Angulo Perez, Carmen, Coc, Alain, and Vangioni-Flam, Elisabeth

Abstract

We use the R-matrix theory to fit S-factor data on nuclear reactions involved in Big Bang nucleosynthesis. We derive the reaction rates with associated uncertainties, which are evaluated on statistical grounds. We provide S factors and reaction rates in tabular and graphical formats (available at http://pntpm3.ulb.ac.be/bigbang). © 2005 Elsevier B.V. All rights reserved., info:eu-repo/semantics/published, Nuclei in the Cosmos VIII. Proceedings, 8th International Symposium on Nuclei in the Cosmos, Vancouver, Canada, 19-23 July 2004, edited by L. Buchmann, M. Comyn and J. Thomson

Published
2005

38. New insights into the resonance states of 5H and 5He

Author

Ter-Akopian, Gurgen, Fomichev, Andrey, Golovkov, M.S., Grigorenko, Leonid, Krupko, S.A., Oganessian, Yu.Ts., Rodin, AM, Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Wolski, Roman, Korsheninnikov, A.A., Nikolskii, Yu, Roussel-Chomaz, Patricia, Mittig, Wolfgang, Palit, Rudrajyoti, Bouchat, Virginie, Kinnard, V., Materna, Thomas, Hanappe, Francis, Dorvaux, O., Stuttge, Louise, Angulo Perez, Carmen, Lapoux, Valerie, Raabe, Riccardo, Nalpas, L., Yukhimchuk, Arkadiy, Perevozchikov, V.V., Vinogradov, Yu, Grishechkin, S.K., Zlatoustovskiy, S.V., Ter-Akopian, Gurgen, Fomichev, Andrey, Golovkov, M.S., Grigorenko, Leonid, Krupko, S.A., Oganessian, Yu.Ts., Rodin, AM, Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Wolski, Roman, Korsheninnikov, A.A., Nikolskii, Yu, Roussel-Chomaz, Patricia, Mittig, Wolfgang, Palit, Rudrajyoti, Bouchat, Virginie, Kinnard, V., Materna, Thomas, Hanappe, Francis, Dorvaux, O., Stuttge, Louise, Angulo Perez, Carmen, Lapoux, Valerie, Raabe, Riccardo, Nalpas, L., Yukhimchuk, Arkadiy, Perevozchikov, V.V., Vinogradov, Yu, Grishechkin, S.K., and Zlatoustovskiy, S.V.

Abstract

The 5H system was produced in the 3H(t, p) 5H reaction studied at small CM angles with a 58MeV tritium ion beam. High statistics data were used to reconstruct the energy and angular correlations between the 5H decay fragments. A broad structure in the 5H missing-mass spectrum showing up above 2.5MeV was identified as a mixture of the 3/2+ and 5/2+ states. The data also present an evidence that the 1/2+ ground state of 5H is located at about 2MeV. Then, the 5H and 5He systems were explored by means of transfer reactions occurring in the interactions of 132MeV 6He beam nuclei with deuterium. In the 2H( 6He, 3H) reaction a T = 3/2 isobaric analog state of 5H in 5He was observed at an excitation energy of 22.0±0.3MeV with a width of 2.5±0.3MeV. © Società Italiana di Fisica / Springer-Verlag 2005., SCOPUS: cp.j, info:eu-repo/semantics/published

Published
2005

39. Updated Big Bang nucleosynthesis compared with Wilkinson microwave anisotropy probe observations and the abundance of light elements

Author

Coc, Alain, Vangioni-Flam, Elisabeth, Descouvemont, Pierre, Adahchour, Abderrahim, Angulo Perez, Carmen, Coc, Alain, Vangioni-Flam, Elisabeth, Descouvemont, Pierre, Adahchour, Abderrahim, and Angulo Perez, Carmen

Abstract

We improve standard big bang nucleosynthesis (SBBN) calculations by taking into account new nuclear physics analyses (the 2003 work of Descouvemont and coworkers). Using a Monte Carlo technique, we calculate the abundances of light nuclei (D, 3He, 4He, and 7Li) versus the baryon-to-photon ratio. The results concerning Ωbh 2are compared with relevant astrophysical and cosmological observations: the abundance determinations in primitive media and the results from cosmic microwave background (CMB) experiments, especially the Wilkinson Microwave Anisotropy Probe (WMAP) mission. Consistency between WMAP, SBBN results, and D/H data strengthens the deduced baryon density and has interesting consequences on cosmic chemical evolution. A significant discrepancy between the calculated 7Li abundance deduced from WMAP and the Spite plateau is clearly revealed. To explain this discrepancy, three possibilities are invoked: systematic uncertainties on the Li abundance, surface alteration of Li in the course of stellar evolution, or poor knowledge of the reaction rates related to 7Be destruction. In particular, the possible role of the up to now neglected 7Be(d, p)2 α and 7Be(d, α)5Li reactions is considered. Another way to reconcile these results coming from different horizons consists of invoking new, speculative primordial physics that could modify the nucleosynthesis emerging from the big bang and perhaps the CMB physics itself. The impressive advances in CMB observations provide a strong motivation for more efforts in experimental nuclear physics and high-quality spectroscopy to keep SBBN in pace., info:eu-repo/semantics/published

Published
2004

40. Astrophysical S-factor of 14N(p,)15O

Author

Formicola, A., Imbriana, G., Costantini, H., Angulo Perez, Carmen, Bemmerer, D., Bonetti, R., Broggini, C., Corvisiero, P., Cruz, J., Descouvemont, Pierre, Fulop, Zsolt, Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, Gy, Jesus, A. P., Junker, Matthias, Lemut, A., Menegazzo, R., Prati, P., Roca, V., Rolfs, Claus, Romano, M., Alvarez, C., Schumann, F., Somorjai, Endre, Straniero, O., Strieder, Frank, Terrasi, F., Trautvetter, H. P., Vomiero, A., Zavatarelli, Sandra, Formicola, A., Imbriana, G., Costantini, H., Angulo Perez, Carmen, Bemmerer, D., Bonetti, R., Broggini, C., Corvisiero, P., Cruz, J., Descouvemont, Pierre, Fulop, Zsolt, Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, Gy, Jesus, A. P., Junker, Matthias, Lemut, A., Menegazzo, R., Prati, P., Roca, V., Rolfs, Claus, Romano, M., Alvarez, C., Schumann, F., Somorjai, Endre, Straniero, O., Strieder, Frank, Terrasi, F., Trautvetter, H. P., Vomiero, A., and Zavatarelli, Sandra

Abstract

We report on a new measurement of the 14N(p,γ) 15O capture cross section at Ep=140 to 400 keV using the 400 kV LUNA accelerator facility at the Laboratori Nazionali del Gran Sasso (LNGS). The uncertainties have been reduced with respect to previous measurements and their analysis. We have analyzed the data using the R-matrix method and we find that the ground state transition accounts for about 15% of the total S-factor. The main contribution to the S-factor is given by the transition to the 6.79 MeV state. We find a total S(0)=1.7±0.2 keVb, in agreement with recent extrapolations. The result has important consequences for the solar neutrino spectrum as well as for the age of globular clusters. © 2004 Elsevier B.V. All rights reserved., info:eu-repo/semantics/published

Published
2004

41. Updated Big-Bang Nucleosynthesis compared to WMAP results

Author

Coc, Alain, Vangioni-Flam, Elisabeth, Descouvemont, Pierre, Adahchour, Abderrahim, Angulo Perez, Carmen, Coc, Alain, Vangioni-Flam, Elisabeth, Descouvemont, Pierre, Adahchour, Abderrahim, and Angulo Perez, Carmen

Abstract

From the observations of the anisotropies of the Cosmic Microwave Background (CMB) radiation, the WMAP satellite has provided a determination of the baryonic density of the Universe, Ωbh2, with an unprecedented precision. This imposes a careful reanalysis of the standard Big-Bang Nucleosynthesis (SBBN) calculations. We have updated our previous calculations using thermonuclear reaction rates provided by a new analysis of experimental nuclear data constrained by R-matrix theory. Combining these BBN results with the Ωbh2 value from WMAP, we deduce the light element (4He, D, 3He and 7Li) primordial abundances and compare them with spectroscopic observations. There is a very good agreement with deuterium observed in cosmological clouds, which strengthens the confidence on the estimated baryonic density of the Universe. However, there is an important discrepancy between the deduced 7Li abundance and the one observed in halo stars of our Galaxy, supposed, until now, to represent the primordial abundance of this isotope. The origin of this discrepancy, observational, nuclear or more fundamental remains to be clarified. The possible role of the up to now neglected 7Be(d,p)2α and 7Be(d,α)5Li reactions is considered., SCOPUS: cp.p, info:eu-repo/semantics/published

Published
2004

42. Observation of excited states in5H

Author

Golovkov, M.S., Grigorenko, Leonid, Fomichev, Andrey, Krupko, S.A., Oganessian, Yu.Ts., Rodin, AM, Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Ter-Akopian, Gurgen, Wolski, Roman, Itkis, Mikhail, Bogatchev, A.A., Kondratiev, N.A., Kozulin, E.M., Korsheninnikov, A.A., Nikolskii, Yu, Roussel-Chomaz, Patricia, Mittig, Wolfgang, Palit, Rudrajyoti, Bouchat, Virginie, Kinnard, V., Materna, Thomas, Hanappe, Francis, Dorvaux, O., Stuttge, Louise, Angulo Perez, Carmen, Lapoux, Valerie, Raabe, Riccardo, Nalpas, L., Yukhimchuk, Arkadiy, Perevozchikov, V.V., Vinogradov, Yu, Grishechkin, S.K., Zlatoustovskiy, S.V., Golovkov, M.S., Grigorenko, Leonid, Fomichev, Andrey, Krupko, S.A., Oganessian, Yu.Ts., Rodin, AM, Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Ter-Akopian, Gurgen, Wolski, Roman, Itkis, Mikhail, Bogatchev, A.A., Kondratiev, N.A., Kozulin, E.M., Korsheninnikov, A.A., Nikolskii, Yu, Roussel-Chomaz, Patricia, Mittig, Wolfgang, Palit, Rudrajyoti, Bouchat, Virginie, Kinnard, V., Materna, Thomas, Hanappe, Francis, Dorvaux, O., Stuttge, Louise, Angulo Perez, Carmen, Lapoux, Valerie, Raabe, Riccardo, Nalpas, L., Yukhimchuk, Arkadiy, Perevozchikov, V.V., Vinogradov, Yu, Grishechkin, S.K., and Zlatoustovskiy, S.V.

Abstract

The excited states in the 5H system, which was produced in the 3H(t, p)5H reaction with a 58 MeV tritium beam at c.m. angles were investigated. The reconstruction of the energy and angular correlations between the 5H decay fragments was performed by using high statistics data. It was observed that a broad structure in the 5H missing mass spectrum above 2.5 MeV was identified as a mixture of the 3/2+ and 5/2+ states. The results show that the 3/2+ and 5/2+ states are either almost degenerate or the reaction mechanism causes a very specific interference of these states., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2004

43. Compilation and R-matrix analysis of Big Bang nuclear reaction rates

Author

Descouvemont, Pierre, Adahchour, Abderrahim, Angulo Perez, Carmen, Coc, Alain, Vangioni-Flam, Elisabeth, Descouvemont, Pierre, Adahchour, Abderrahim, Angulo Perez, Carmen, Coc, Alain, and Vangioni-Flam, Elisabeth

Abstract

We use the R-matrix theory to fit low-energy data on nuclear reactions involved in Big Bang nucleosynthesis. Special attention is paid to the rate uncertainties which are evaluated on statistical grounds. We provide S factors and reaction rates in tabular and graphical formats. © 2004 Elsevier Inc. All rights reserved., info:eu-repo/semantics/published

Published
2004

44. Compilation and R-matrix analysis of Big Bang nuclear reaction rates

Author

Descouvemont, Pierre, Adahchour, Abderrahim, Angulo Perez, Carmen, Coc, Alain, Vangioni-Flam, Elisabeth, Descouvemont, Pierre, Adahchour, Abderrahim, Angulo Perez, Carmen, Coc, Alain, and Vangioni-Flam, Elisabeth

Abstract

We use the R-matrix theory to fit low-energy data on nuclear reactions involved in Big Bang nucleosynthesis. Special attention is paid to the rate uncertainties which are evaluated on statistical grounds. We provide S factors and reaction rates in tabular and graphical formats. © 2004 Elsevier Inc. All rights reserved., info:eu-repo/semantics/published

Published
2004

45. Observation of excited states in5H

Author

Golovkov, M.S., Grigorenko, Leonid, Fomichev, Andrey, Krupko, S.A., Oganessian, Yu.Ts., Rodin, AM, Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Ter-Akopian, Gurgen, Wolski, Roman, Itkis, Mikhail, Bogatchev, A.A., Kondratiev, N.A., Kozulin, E.M., Korsheninnikov, A.A., Nikolskii, Yu, Roussel-Chomaz, Patricia, Mittig, Wolfgang, Palit, Rudrajyoti, Bouchat, Virginie, Kinnard, V., Materna, Thomas, Hanappe, Francis, Dorvaux, O., Stuttge, Louise, Angulo Perez, Carmen, Lapoux, Valerie, Raabe, Riccardo, Nalpas, L., Yukhimchuk, Arkadiy, Perevozchikov, V.V., Vinogradov, Yu, Grishechkin, S.K., Zlatoustovskiy, S.V., Golovkov, M.S., Grigorenko, Leonid, Fomichev, Andrey, Krupko, S.A., Oganessian, Yu.Ts., Rodin, AM, Sidorchuk, S.I., Slepnev, R.S., Stepantsov, S.V., Ter-Akopian, Gurgen, Wolski, Roman, Itkis, Mikhail, Bogatchev, A.A., Kondratiev, N.A., Kozulin, E.M., Korsheninnikov, A.A., Nikolskii, Yu, Roussel-Chomaz, Patricia, Mittig, Wolfgang, Palit, Rudrajyoti, Bouchat, Virginie, Kinnard, V., Materna, Thomas, Hanappe, Francis, Dorvaux, O., Stuttge, Louise, Angulo Perez, Carmen, Lapoux, Valerie, Raabe, Riccardo, Nalpas, L., Yukhimchuk, Arkadiy, Perevozchikov, V.V., Vinogradov, Yu, Grishechkin, S.K., and Zlatoustovskiy, S.V.

Abstract

The excited states in the 5H system, which was produced in the 3H(t, p)5H reaction with a 58 MeV tritium beam at c.m. angles were investigated. The reconstruction of the energy and angular correlations between the 5H decay fragments was performed by using high statistics data. It was observed that a broad structure in the 5H missing mass spectrum above 2.5 MeV was identified as a mixture of the 3/2+ and 5/2+ states. The results show that the 3/2+ and 5/2+ states are either almost degenerate or the reaction mechanism causes a very specific interference of these states., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2004

46. Experimental determination of the 7Be + p scattering lengths

Author

Angulo Perez, Carmen, Azzouz, Malika, Descouvemont, Pierre, Tabacaru, Gabriel, Baye, Daniel Jean, Cogneau, Michel, Couder, Manoël, Davinson, Thomas, Di Pietro, Alessia, Figuera, Pierpaolo Paolo, Gaelens, Michel, Leleux, Pol, Loiselet, Marc, Ninane, A., de Oliveira Santos, François, Pizzone, Rosario Gianluca, Ryckewaert, Guido, de Séréville, Nicolas, Vanderbist, Francis, Angulo Perez, Carmen, Azzouz, Malika, Descouvemont, Pierre, Tabacaru, Gabriel, Baye, Daniel Jean, Cogneau, Michel, Couder, Manoël, Davinson, Thomas, Di Pietro, Alessia, Figuera, Pierpaolo Paolo, Gaelens, Michel, Leleux, Pol, Loiselet, Marc, Ninane, A., de Oliveira Santos, François, Pizzone, Rosario Gianluca, Ryckewaert, Guido, de Séréville, Nicolas, and Vanderbist, Francis

Abstract

The 7Be + p elastic cross section has been measured at the Centre de Recherches du Cyclotron RIB facility at Louvain-la-Neuve in the c.m. energy region from 0.3 to 0.75 MeV by bombarding a proton-rich target with a radioactive 7Be beam. The recoil protons have been detected in the angular range θc.m. = 120.2°-131.1° and θc.m. = 156.6°-170.2° using the LEDA system. From a R-matrix analysis of the cross section data, we obtain the energy and the width of the 1+ resonance (Ex = 0.77 MeV). The ℓ = 0 scattering lengths a01 = 25±9 fm (channel spin I = 1) and a02 =-7 ± 3 fm (channel spin I = 2) have been deduced. They are compared to values expected from charge-symmetry properties. Implications on the low energy S-factor of the 7Be(p,γ)8B reaction are discussed. © 2003 Elsevier Science B.V. All rights reserved., SCOPUS: re.j, info:eu-repo/semantics/published

Published
2003

47. Spectroscopy of the proton drip line nucleus 19Na by 1H(18Ne,p)18Ne elastic scattering

Author

Angulo Perez, Carmen, Tabacaru, Gabriel, Couder, Manoël, Gaelens, Michel, Leleux, Pol, Ninane, A., Vanderbist, Francis, Davinson, Thomas, Woods, Philippe J., Schweitzer, Jeffrey S., Achouri, N. L., Angélique, Jean Claude, Berthoumieux, Eric, de Oliveira Santos, François, Himpe, P., Descouvemont, Pierre, Angulo Perez, Carmen, Tabacaru, Gabriel, Couder, Manoël, Gaelens, Michel, Leleux, Pol, Ninane, A., Vanderbist, Francis, Davinson, Thomas, Woods, Philippe J., Schweitzer, Jeffrey S., Achouri, N. L., Angélique, Jean Claude, Berthoumieux, Eric, de Oliveira Santos, François, Himpe, P., and Descouvemont, Pierre

Abstract

We have studied the resonant elastic scattering reaction 18Ne+p in reverse kinematics, by using the intense (4 × 106 pps) 18Ne radioactive beam at the Centre de Recherches du Cyclotron RIB facility at Louvain-la-Neuve. The recoil protons were detected at 20 different angles in the LEDA segmented silicon detector. The resulting elastic scattering cross sections have been analysed using the R-matrix method. We have observed for the first time the second excited state (Jπ = 1/2+, ℓ = 0) of the proton-rich nucleus 19Na at the center-of-mass energy Ec.m. = 1.066 ± 0.003 MeV with a proton width Γp = 101 ± 3 keV. The Coulomb shift between the 1/2+ mirror levels in 19O and 19Na is 0.73 MeV, among the largest values currently observed in light exotic nuclei., info:eu-repo/semantics/published, Nuclear physics in astrophysics. Proceeding, XVIIth International Nuclear Physics Divisional Conference of the European Physical Society, Debrecen (Houngary), 30 September - 4 October 2002

Published
2003

48. Identification of a new low-lying state in the proton drip line nucleus 19Na

Author

Angulo Perez, Carmen, Tabacaru, Gabriel, Couder, Manoël, Gaelens, Michel, Leleux, Pol, Ninane, A., Vanderbist, Francis, Davinson, Thomas, Woods, Philippe J., Schweitzer, Jeffrey S., Achouri, N. L., Angélique, Jean Claude, Berthoumieux, Eric, de Oliveira Santos, François, Himpe, P., Descouvemont, Pierre, Angulo Perez, Carmen, Tabacaru, Gabriel, Couder, Manoël, Gaelens, Michel, Leleux, Pol, Ninane, A., Vanderbist, Francis, Davinson, Thomas, Woods, Philippe J., Schweitzer, Jeffrey S., Achouri, N. L., Angélique, Jean Claude, Berthoumieux, Eric, de Oliveira Santos, François, Himpe, P., and Descouvemont, Pierre

Abstract

The second excited state (Jπ = 1/2,+, l = 0) of the proton-rich nucleus 19Na has been observed for the first time using the elastic scattering reaction 1H(18Ne, 1H) 18Ne. An intense (4 × 106 pps) 18Ne radioactive beam was produced at the CRC-RIB facility at Louvain-la-Neuve to bombard a polyethylene target. The recoil protons were detected at 20 different angles in the LEDA segmented silicon detector. The resulting elastic scattering cross sections have been analyzed using a global R-matrix. fit. We find that the second excited state in 19Na lies at the center-of-mass energy Ec.m. = 1.066±0.003 MeV with respect to the 18Ne+p threshold, and has a proton width Γp = 101±3 keV. The Coulomb shift between the 1/2+ mirror levels in 19O and 19Na is 0.73 MeV, among the largest values currently observed in light exotic nuclei., info:eu-repo/semantics/published

Published
2003

49. 2n-transfer contribution in the 4He(6He,6He)4He cross section at Ec.m.=11.6 MeV

Author

Raabe, Riccardo, Andreyev, Andrei, Huyse, Mark, Piechaczek, Andreas, Van Duppen, Piet, Weissman, Leo, Wöhr, Andreas, Angulo Perez, Carmen, Cherubini, Silvio, Musumerre, A., Baye, Daniel Jean, Descouvemont, Pierre, Davinson, Thomas, Di Pietro, Alessia, Laird, Alison, Ostrowski, Adam, Shotter, Alan C., Galanina, L. I., Zelenskaya, N. S., Raabe, Riccardo, Andreyev, Andrei, Huyse, Mark, Piechaczek, Andreas, Van Duppen, Piet, Weissman, Leo, Wöhr, Andreas, Angulo Perez, Carmen, Cherubini, Silvio, Musumerre, A., Baye, Daniel Jean, Descouvemont, Pierre, Davinson, Thomas, Di Pietro, Alessia, Laird, Alison, Ostrowski, Adam, Shotter, Alan C., Galanina, L. I., and Zelenskaya, N. S.

Abstract

info:eu-repo/semantics/published

Published
2003

50. 2n-transfer contribution in the 4He(6He,6He)4He cross section at Ec.m.=11.6 MeV

Author

Raabe, Riccardo, Andreyev, Andrei, Huyse, Mark, Piechaczek, Andreas, Van Duppen, Piet, Weissman, Leo, Wöhr, Andreas, Angulo Perez, Carmen, Cherubini, Silvio, Musumerre, A., Baye, Daniel Jean, Descouvemont, Pierre, Davinson, Thomas, Di Pietro, Alessia, Laird, Alison, Ostrowski, Adam, Shotter, Alan C., Galanina, L. I., Zelenskaya, N. S., Raabe, Riccardo, Andreyev, Andrei, Huyse, Mark, Piechaczek, Andreas, Van Duppen, Piet, Weissman, Leo, Wöhr, Andreas, Angulo Perez, Carmen, Cherubini, Silvio, Musumerre, A., Baye, Daniel Jean, Descouvemont, Pierre, Davinson, Thomas, Di Pietro, Alessia, Laird, Alison, Ostrowski, Adam, Shotter, Alan C., Galanina, L. I., and Zelenskaya, N. S.

Abstract

info:eu-repo/semantics/published

Published
2003

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