Filters
Results 1 - 10 of 35
Results 1 - 10 of 35.
Search took: 0.026 seconds
Sort by: date | relevance |
Sereville, N. de
Paris-7 Univ. Denis Diderot, 75 (France)2003
Paris-7 Univ. Denis Diderot, 75 (France)2003
AbstractAbstract
[en] The gamma emission from novae at/or below 511 keV is due to the annihilation of the positrons produced in the beta + decay of F18. The interpretation of this emission through observations made by the Integral satellite for instance, requires a good knowledge of F18 nucleosynthesis. The reaction rate of the F18(p,α)O15 is the least known because of 2 resonances corresponding to the levels 6.419 and 6.449 MeV of Ne19 whose proton widths are completely unknown. We have determined these proton widths via the study of one-nucleon transfer reaction D(F18,pα)N15 populating equivalent levels in F19. We have used a 14 MeV F18 radioactive beam on a CD2 target for inverse kinematics studies and the multi-track silicon detector LEDA. A DWBA (Distorted Wave Bound Approximation) has enabled us to determine the proton width of both resonances and has showed that they have an impact in the calculation of the reaction rate. A thorough study of the remaining uncertainties of the reaction rate has been undertaken, particularly for those concerning interferences between these resonances and a higher resonance of Ne19. The reaction rate that we have obtained is very similar to the previous rate used but now it rests on a more solid basis
Original Title
Etude de la reaction 18F(p,α)15O par reaction de transfert pour application a l'emission γ des Novae
Primary Subject
Source
Dec 2003; 194 p; 125 refs.; These physique nucleaire
Record Type
Report
Literature Type
Thesis/Dissertation
Report Number
Country of publication
APPROXIMATIONS, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, BINARY STARS, BORN APPROXIMATION, CALCULATION METHODS, DIMENSIONLESS NUMBERS, DIRECT REACTIONS, ERUPTIVE VARIABLE STARS, EVEN-ODD NUCLEI, FLUORINE ISOTOPES, HOURS LIVING RADIOISOTOPES, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, KINETICS, LIGHT NUCLEI, MATRICES, NANOSECONDS LIVING RADIOISOTOPES, NEON ISOTOPES, NUCLEAR REACTIONS, NUCLEI, ODD-ODD NUCLEI, RADIOISOTOPES, REACTION KINETICS, SECONDS LIVING RADIOISOTOPES, SPECTROSCOPY, STARS, SYNTHESIS, TARGETS, TRANSFER REACTIONS, VARIABLE STARS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
No abstract available
Primary Subject
Source
(c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
ALKALINE EARTH ISOTOPES, BARYONS, CARBON ISOTOPES, CHARGED PARTICLES, ELECTROMAGNETIC RADIATION, ELEMENTARY PARTICLES, ELEMENTS, EVEN-EVEN NUCLEI, FERMIONS, HADRONS, IONIZING RADIATIONS, ISOTOPES, LIGHT NUCLEI, MAGNESIUM ISOTOPES, METALS, NUCLEI, NUCLEONS, OXYGEN ISOTOPES, RADIATIONS, STABLE ISOTOPES, TRANSITION ELEMENTS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
Sereville, N. de; Coc, A.; Angulo, C.
Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, Paris-11 Univ., 91 - Orsay (France)2002
Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, Paris-11 Univ., 91 - Orsay (France)2002
AbstractAbstract
[en] The 18F(p,α)15O reaction was recognized as one of the most important for gamma ray astronomy in novae as it governs the early 511 keV emission. However, its rate remains largely uncertain at nova temperatures. A direct measurement of the cross section over the full range of nova energies is impossible because of its vanishing value at low energy and of the short 18F lifetime. Therefore, in order to better constrain this reaction rate, we have performed an indirect experiment taking advantage of the availability of a high purity and intense radioactive 18F beam at the Louvain La Neuve RIB facility.We present here the first results of the data analysis and discuss the consequences. (authors)
Primary Subject
Source
2002; 5 p; Classical Novae Explosions; Sitges (Spain); 20-24 May 2002; HEP-NUCL-EX--0206014; Available from internet at http://documentation.in2p3.fr/publiin2p3/data/PubliDocument33881.pdf; arXiv: nucl-ex/0206014; 12 refs., 3 figs.
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
ASTRONOMY, BARYON REACTIONS, BEAMS, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, BINARY STARS, CHARGED-PARTICLE REACTIONS, ELECTROMAGNETIC RADIATION, ERUPTIVE VARIABLE STARS, FLUORINE ISOTOPES, HADRON REACTIONS, HOURS LIVING RADIOISOTOPES, INTERACTIONS, ION BEAMS, IONIZING RADIATIONS, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, LIGHT NUCLEI, NANOSECONDS LIVING RADIOISOTOPES, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, ODD-ODD NUCLEI, PARTICLE INTERACTIONS, RADIATIONS, RADIOISOTOPES, STARS, TARGETS, VARIABLE STARS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
Kiener, J.; Gros, M.; Tatischeff, V.; Attie, D.; Bailly, I.; Bauchet, A.; Chapuis, C.; Cordier, B.; Deloncle, I.; Porquet, M.G.; Schanne, S.; Sereville, N. de; Tauzin, G., E-mail: kiener@csnsm.in2p3.fr
arXiv e-print [ PDF ]2004
arXiv e-print [ PDF ]2004
AbstractAbstract
[en] Gamma-ray angular distributions for the resonances at Ep=550 and 1747 keV of the radiative capture reaction 13C(p,γ)14N have been measured, using intense proton beams on isotopically pure 13C targets. Experimental gamma-ray spectra were obtained with three HP-Germanium detectors at four angles for Ep=550 keV and six angles for Ep=1747 keV in the range of 0-90 deg. with respect to the proton beam. From the data, relative intensities for the strongest transitions were extracted with an accuracy of typically 5%, making these resonances new useful gamma-ray standards for efficiency calibration in the energy range from Eγ=1.6-9 MeV. Gamma-ray branching ratios were obtained for several levels of 14N and are compared with literature values
Primary Subject
Source
S0168900203028730; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: Mexico
Record Type
Journal Article
Journal
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002; ; CODEN NIMAER; v. 519(3); p. 623-635
Country of publication
CARBON ISOTOPES, DISTRIBUTION, ELECTROMAGNETIC RADIATION, ENERGY RANGE, EVALUATION, EVEN-ODD NUCLEI, GE SEMICONDUCTOR DETECTORS, INFORMATION, IONIZING RADIATIONS, ISOTOPES, LIGHT NUCLEI, MEASURING INSTRUMENTS, NITROGEN ISOTOPES, NUCLEI, ODD-ODD NUCLEI, RADIATION DETECTORS, RADIATIONS, SEMICONDUCTOR DETECTORS, STABLE ISOTOPES
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
Sereville, N. de; Coc, A.; Angulo, C.
CSNSM, CNRS/IN2P3/UPS, Bat. 104, 91405 Orsay Campus (France)2003
CSNSM, CNRS/IN2P3/UPS, Bat. 104, 91405 Orsay Campus (France)2003
AbstractAbstract
[en] The 18F(p, α)15O reaction is recognized as one of the most important reaction for nova gamma-ray astronomy as it governs the early ≤ 511 keV emission. However, its rate remains largely uncertain at nova temperatures due to unknown low-energy resonance strengths. In order to better constrain this reaction rate, we have studied the one-nucleon transfer reaction, D(18F,pα)15N, at the CRC-RIB facility at Louvain La Neuve. (authors)
Primary Subject
Source
2003; 4 p; 7. International Symposium on Nuclei in the Cosmos; Fuji-Yoshida (Japan); 8-12 Jul 2002; NUCL-EX--0209017; Available from internet at http://documentation.in2p3.fr/publiin2p3/data/PubliDocument35138.pdf. Document also available from Service de Documentation, Institut de Physique Nucleaire de Lyon, Universite Claude Bernard, Lyon I, 43 bd du 11 Novembre 1918, F - 69622 Villeurbanne Cedex (FR); 10 refs., 2 figs.
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
ASTRONOMY, BARYON REACTIONS, BINARY STARS, CHARGED-PARTICLE REACTIONS, CROSS SECTIONS, DIFFERENTIAL CROSS SECTIONS, DIRECT REACTIONS, DISTRIBUTION, ELECTROMAGNETIC RADIATION, ERUPTIVE VARIABLE STARS, FUNCTIONS, HADRON REACTIONS, HYDROGEN ISOTOPES, IONIZING RADIATIONS, ISOTOPES, KINETICS, LIGHT NUCLEI, MOMENTUM TRANSFER, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, ODD-ODD NUCLEI, RADIATIONS, STABLE ISOTOPES, STARS, TARGETS, VARIABLE STARS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
AbstractAbstract
[en] 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 deg. - 131.1 deg. and θc.m. = 156.6 deg. - 170.2 deg. using the LEDA system. From a R-matrix analysis of the cross section data, we extract the energy and the width of the 1+ resonance. The scattering lengths α01 = 25 ± 9 fm (channel spin I = 1) and α02 = -7 ± 3 fm (channel spin I = 2) are deduced. Implications on the low energy S-factor of the 7Be(p, γ)8B reaction are discussed
Primary Subject
Source
S0375947403009369; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: Croatia
Record Type
Journal Article
Journal
Country of publication
ACCELERATORS, ALKALINE EARTH ISOTOPES, ALPHA DECAY RADIOISOTOPES, ANGULAR MOMENTUM, BERYLLIUM ISOTOPES, CYCLIC ACCELERATORS, CYCLOTRONS, EVEN-EVEN NUCLEI, HEAVY ION ACCELERATORS, HEAVY ION REACTIONS, ISOCHRONOUS CYCLOTRONS, ISOTOPES, LIGHT NUCLEI, MATRICES, NUCLEAR REACTIONS, NUCLEI, PARTICLE PROPERTIES, RADIOISOTOPES, SCATTERING
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] The 18F(p,α)15O reaction is recognized as one of the most important reaction for nova gamma-ray astronomy as it governs the early 511 keV emission. However, its rate remains largely uncertain at nova temperatures due to unknown low-energy resonance strengths. We report here on our lastest results concerning the study of the D(18F,pα)15N reaction, as well as on the determination of the 18F(p,α)15O reaction rate using the R-matrix theory. Remaining uncertainties are discussed
Primary Subject
Source
8. international symposium on nuclei in the cosmos; Vancouver, BC (Canada); 19-23 Jul 2004; S0375-9474(05)00829-8; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Literature Type
Conference
Journal
Country of publication
ASTRONOMY, BARYON REACTIONS, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, CHARGED PARTICLES, CHARGED-PARTICLE REACTIONS, ELECTROMAGNETIC RADIATION, EMISSION, ENERGY RANGE, EVEN-ODD NUCLEI, FLUORINE ISOTOPES, HADRON REACTIONS, HOURS LIVING RADIOISOTOPES, IONIZING RADIATIONS, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, KINETICS, LIGHT NUCLEI, MATRICES, MINUTES LIVING RADIOISOTOPES, NANOSECONDS LIVING RADIOISOTOPES, NITROGEN ISOTOPES, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, ODD-EVEN NUCLEI, ODD-ODD NUCLEI, OXYGEN ISOTOPES, RADIATIONS, RADIOISOTOPES, REACTION KINETICS, STABLE ISOTOPES, TARGETS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
Angulo, C.; Azzouz, M.; Descouvemont, P.; Tabacaru, G.; Baye, D.; Cogneau, M.; Couder, M.; Davinson, T.; Di Pietro, A.; Figuera, P.; Gaelens, M.; Leleux, P.; Loiselet, M.; Ninane, A.; Oliveira Santos, F. de; Pizzone, R.G.; Ryckewaert, G.; Sereville, N. de; Vanderbist, F., E-mail: angulo@cyc.ucl.ac.be2003
AbstractAbstract
[en] 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 deg. -131.1 deg. and θc.m.=156.6 deg. -170.2 deg. 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
Primary Subject
Source
S0375947402015841; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Sereville, N. de; Coc, A.; Angulo, C.; Assuncao, M.; Beaumel, D.; Bouzid, B.; Cherubini, S.; Couder, M.; Demaret, P.; Oliveira Santos, F. de; Figuera, P.; Fortier, S.; Gaelens, M.; Hammache, F.; Kiener, J.; Labar, D.; Lefebvre, A.; Leleux, P.; Loiselet, M.; Ninane, A.; Quichaoui, S.; Ryckewaert, G.; Smirnova, N.; Tatischeff, V.; Thibaud, J.-P.2003
AbstractAbstract
[en] The 18F(p,α)15O reaction is recognized as one of the most important reaction for nova gamma-ray astronomy as it governs the early ≤ 511 keV emission. However, its rate remains largely uncertain at nova temperatures due to unknown low-energy resonance strengths. In order to better constrain this reaction rate, we have studied the one-nucleon transfer reaction, D(18F,pα)15N, at the CRC-RIB facility at Louvain La Neuve
Primary Subject
Source
S0375947403007255; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: Hungary
Record Type
Journal Article
Journal
Country of publication
ASTRONOMY, BARYON REACTIONS, BINARY STARS, CHARGED-PARTICLE REACTIONS, DECAY, DIRECT REACTIONS, ERUPTIVE VARIABLE STARS, FOUR-NUCLEON TRANSFER REACTIONS, HADRON REACTIONS, KINETICS, MULTI-NUCLEON TRANSFER REACTIONS, NUCLEAR DECAY, NUCLEAR REACTIONS, NUCLEON REACTIONS, REACTION KINETICS, STARS, TARGETS, TRANSFER REACTIONS, VARIABLE STARS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] γ-ray production cross sections have been measured for γ-ray lines copiously emitted in the 3He bombardment of 16O nuclei: the 937-, 1042-, and 1081-keV lines of 18F and the 1887-keV line of 18Ne. Four Ge detectors with BGO shielding for Compton suppression were used to measure the angular distributions of the γ rays. The excitation functions have been obtained for 3He bombarding energies from 3.7 to 36 MeV. Total cross sections are tabulated for calculations relevant to γ-ray astronomy. The importance of these lines as diagnosis for the presence and properties of accelerated 3He in solar flares is discussed in light of the measured cross sections
Primary Subject
Secondary Subject
Source
(c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, CHARGED-PARTICLE REACTIONS, CROSS SECTIONS, DIFFERENTIAL CROSS SECTIONS, DISTRIBUTION, ELECTROMAGNETIC RADIATION, EMISSION, ENERGY RANGE, EVEN-EVEN NUCLEI, FLUORINE ISOTOPES, FUNCTIONS, HOURS LIVING RADIOISOTOPES, IONIZING RADIATIONS, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, LIGHT NUCLEI, MEASURING INSTRUMENTS, NANOSECONDS LIVING RADIOISOTOPES, NEON ISOTOPES, NUCLEAR REACTIONS, NUCLEI, ODD-ODD NUCLEI, RADIATION DETECTORS, RADIATIONS, RADIOISOTOPES, SECONDS LIVING RADIOISOTOPES, SEMICONDUCTOR DETECTORS, SOLAR ACTIVITY, SPECTRA, STELLAR ACTIVITY, STELLAR FLARES, TARGETS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
1 | 2 | 3 | Next |