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235 results on '"Pizzone, R.G."'

101. From Nuclei to Stars with a Trojan Horse

Author

Tumino, A., primary, Spitaleri, C., additional, La Cognata, M., additional, Sergi, M.L., additional, Cherubini, S., additional, Gulino, M., additional, Lamia, L., additional, Pizzone, R.G., additional, Puglia, S.M.R., additional, Rapisarda, G.G., additional, Romano, S., additional, and Spartá, R., additional

Published
2014
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103. Bare astrophysical S(E)-factor for the ^6Li(d, alpha )^4He and ^7Li(p, alpha)^4He reactions at astrophysical energies

Author

Pizzone, R.G., Spitaleri, C., Lattuada, M., Musumarra, A., Pellegriti, M.G., Romano, S., Tumino, A., Cherubini, S., Figuera, P., Miljanić, Đuro, Rolfs, C., Typel, S., Wolter, H.H., Castellani, V., Degl?Innocenti, S., and Imperio, A.

Subjects
Trojan Horse Method, nuclear cross section
Abstract

The Trojan Horse Method has been applied to study the ^7Li(p, alpha)^4He and ^6Li(d, alpha)^4He reactions through the ^7Li(d, alpha, alpha)n and ^6Li(^6Li, alpha, alpha)^4He three body processes, respectively. The electron screening potential deduced from these experiments is much larger than the adiabatic approximation prediction for both cases ; the systematic discrepancy between data and theoretical predictions is thus confirmed. Astrophysical implications of these measurements are also discussed.

Published
2003

104. The ^7Li(P, alpha)^4He fusion reaction studied via the Trojan Horse Method and its astrophysical implications

Author

Pizzone, R.G., Spitaleri, C., Lattuada, M., Musumarra, A., Pellegriti, M.G., Rolfs, C., Miljanić, Đuro, Di Pietro, A., Figuera, P., Romano, S., Tudisco, S., Tumino, A., Typel, S., Wolter, H.H., Castellani, V., Degl'Innocenti, S., and Imperio, A.

Subjects
Trojan horse method, fusion reactions
Abstract

The ^7Li(p, alpha)4He bare nucleus S(E)-factor, S, (E) plays a key role in the lithium problem. The presence of the Coulomb barrier and elec- tron screening effect makes this measurement at astrophysical energies very hard to perform. Thus experimental S(E)-factors are usually corrected for the electron screening enhancement factor and then extrapolated to nearly zero energies. The Trojan Horse Method [l] can be applied to ex- tract the energy dependence of &, (E), at very low energies without any extrapolation, by mea- suring the cross section of a suitable three body process. We have applied the THM to study the 7Li(p, o)4He reaction through the 7Li(d, o:cy)n three body process and the value deduced from this experiment, using the DWBA approach, is $(0)x55 f 3 keV.b [2], slightly different from the value reported in the NACRE compilation. It is also possible to measure the electron screening potential U, which in this case is 330f40 eV. The FRANEC code was then used to calculate the sur- face lithium abundance during the Sun lifetime ; the two calculations, with rates derived from [2] and from NACRE, are shown in fig. 1.

Published
2003

105. Experimental determination of the $^{7}$Be + p scattering lengths

Author

Angulo, C., Azzouz, M., Descouvement, P., Tabacaru, G., Baye, D., Cogneau, M., Couder, M., Davinson, T., Di Pietro, A., Figuera, P., Gaelens, M., Leleux, P., Loiselet, M., Ninane, A., de Oliveira Santos, Francois, Pizzone, R.G., Ryckewaert, G., Séréville, N. De, Vanderbist, F., 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), Centre de Sciences Nucléaires et de Sciences de la Matière (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), 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), and 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)

Subjects
R-matrix analysis, Scattering lengths, Radioactive beam, 25.60.Bx, 25.70.Ef, 26.65.+t, 27.20.+n, Elastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
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.

Published
2003
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106. The elastic scattering $^{7}$Be+p at low energies: implications on the $^{7}$Be(p,$\gamma)^{8}$Be S-factor

Author

Angulo, C., Descouvemont, P., Cogneau, M., Couder, M., Gaelens, M., Leleux, P., Loiselet, M., Ryckewaert, G., Tabacaru, G., Vanderbist, F., Davinson, T., Azzouz, M., Baye, D., Di Pietro, A., Figuera, P., Pizzone, R.G., de Oliveira Santos, Francois, Sereville De, N., 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), Lion, Michel, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2002

109. ^10Be and molecular states

Author

Miljanić, Đuro, Soić, Neven, Blagus, Saša, Cherubini, S., Costanzo, Lattuada, M., Milin, Matko, Mussumara, A., Pizzone, R.G., Rendić, Dubravko, Romano, S., Spitaleri, C., Tumino, A., and Zadro, Mile

Subjects
nuclear reactions ^7Li +^7Li, E = 8 and 30 MeV, ^9Be +^7Li, E = 52 MeV, ^10Be levels deduced, a +^6He and a +^6He* decays
Abstract

The ^10Be excitation energy spectra have been obtained from the inclusive and coincident measurements of the reactions: ^7Li+^7Li at E_0 = 8 and 30 MeV and ^9Be+^7Li at E_0 = 52 MeV. Contributions of the ^10Be states below 12 MeV in excitation have been observed. Decays of the states at 9.6, 10.2 and 11.8 into a+^6He and, for the first time, into a+6He* have been found. The results are discussed in addition to the other experimental data and recent theoretical predictions. Proposals for future measurements to search for exotic structures in carbon nuclei are also made.

Published
2002

111. The alpha-^12C radiative capture process and the Trojan Horse Method

Author

Pellegriti, M.G., Aliotta, M., Figuera, P., Lattuada, M., Miljanić, Đuro, Musumarra, A., Pizzone, R.G., Rolfs, C., Romano, S., Spitaleri, C., Tudisco, S., Tumino, A., Typel, S., and Wolter, H.H.

Subjects
nuclear reactions, Trojan Horse Method, astrophysical factors
Abstract

In order to deduce information on the alpha-^12C radiative capture process, the Trojan Horse Method (THM) has been proposed as an indirect method to study the alpha-^12C elastic scattering at low energies. Thus a ^6Li(^12C,^12Calpha)d experiment was performed at 15 and 18 MeV beam energies and the comparison between data and a Montecarlo simulation is discussed.

Published
2001

112. Improved information on the ^2H(^6Li, )^4He reaction extracted via the 'Trojan horse' method

Author

Musumarra, A., Pizzone, R.G., Blagus, Saša, Bogovac, Mladen, Figuera, P., Lattuada, M., Milin, Matko, Miljanić, Đuro, Pellegriti, M.G., Rendić, Dubravko, Rolfs, C., Soić, Neven, Spitaleri, C., Typel, S., Wolter, H.H., and Zadro, Mile

Subjects
Trojan horse method, nuclear reactions
Abstract

We have studied the ^2H(^6Li, )^4He two-body reaction by applying the "Trojan horse" method (THM) to the ^6Li(^6Li, )^4He three-body reaction. The astrophysical S(E) factor has been extracted in the energy range between 10-800 keV for the two cases of target and projectile quasifree break-up. We found good agreement between the two data sets leading an improved determination of the S(E) with S(0) = 16.9ą0.5 MeV b. Furthermore, the electron screening potential energy Ue = 320ą50 eV has been extracted in a model-independent way by comparing direct and THM data. This value is significantly higher than the value predicted by current theoretical models.

Published
2001

113. Trojan horse method applied to ^2H(^6Li, alpha)^4He at astrophysical energies

Author

Spitaleri, C., Typel, S., Pizzone, R.G., Aliotta, M., Blagus, Saša, Bogavac, Mladen, Cherubini, S., Figuera, P., Lattuada, M., Milin, Matko, Miljanić, Đuro, Musumarra, A., Pellegriti, M.G., Rendić, Dubravko, Rolfs, C., Romano, S., Soić, Neven, Tumino, A., Wolter, H.H., and Zadro, Mile

Subjects
nuclear reactions, Trojan horse method, astrophysical factors
Abstract

The ^6Li(^6Li, alpha alpha)^4He three-body reaction has been studied in a kinematically complete experiment at E_^6Li=6 MeV, from which indirect information on the ^2H(^6Li, alpha)^4He two-body reaction at 13 E_cm = 750~keV has been extracted by applying the Trojan Horse method. The method used a recent improved formulation. The derived astrophysical S(E)-factor for the two-body process is compared with that obtained from direct experiments.

Published
2001

114. The bare astrophysical S(E) factor of the ^7Li(p,alpha)alpha reaction

Author

Lattuada, M., Pizzone, R.G., Typel, S., Figuera, P., Miljanić, Đuro, Musumarra, A., Pellegriti, M.G., Rolfs, C., Spitaleri, C., and Wolter H.H.

Subjects
nuclear reactions, nucleosynthesis, abundances
Abstract

The astrophysically important 7Li(p,alpha)alpha reaction has been studied via the Trojan horse method in the energy range E = 10400 keV. A new theoretical description, based on the distorted-wave Born approximation approach, allows one to extract information on the bare astrophysical S-factor, S_b(E), with S_b(0) = 55 ą 3 keV barns. The results are compared with direct experimental data leading to a model-independent value of the electron screening potential energy, U_e = 330 ą 40 eV, much higher than the adiabatic limit U_ad = 175 eV.

Published
2001

115. The alpha-^12C scattering studied via the Trojan-Horse method

Author

Spitaleri, C., Aliotta, M., Figuera, P., Lattuada, M., Pizzone, R.G., Romano, S., Tumino, A., Rolfs, C., Gialanella, L., Streider, F., Cherubini, S., Musumarra, A., Miljanić, Đuro, Typel, S., and Wolter, H.

Subjects
Nuclear Experiment, Trojan-Horse method, virtual alpha-^12C scattering, ^12C(alpha, gamma)^16C, astrophysical energies
Abstract

The ^6Li(^12C,alpha ^12C)^2H reaction was studied in a kinematically complete experiment at an incident energy of 18 MeV. Coincidence spectra show the contribution from the quasi-free alpha-^12C scattering. The cross-section of the virtual alpha-^12C elastic scattering is extracted from the three-body reaction cross-section at low deuteron momenta and compared with the behaviour of the free scattering cross-section. The excitation function of the three-body reaction is calculated in PWBA and compared with the experimental data.

Published
2000

116. Indirect measurement of the 6Li(d, alpha)4He astrophysical factor

Author

Musumarra, A., Aliotta, M., Blagus, Saša, Bogovac, Mladen, Cherubini, S., Figuera, P., Lattuada, M., Milin, Matko, Miljanić, Đuro, Pellegriti, M.G., Pizzone, R.G., Rendić, Dubravko, Soić, Neven, Spitaleri, C., Tumino, A., Typel, S., Wolter, H.H., and Zadro, Mile

Subjects
xx
Abstract

xx

Published
2000

117. Study of the ^7Li(p,alpha)^4He reaction at astrophysical energies through the Trojan Horse method

Author

Pellegriti, M.G., Aliotta, M., Cherubini, S., Lattuada, M., Miljanić, Đuro, Pizzone, R.G., Romano, S., Soić, Neven, Spitaleri, C., Zadro, Mile, Zappala, R.A., and Messina, Antonio

Subjects
Trojan Horse method, astrophysical energies, nuclear reactions
Abstract

The Trojan Horse Method has been applied to obtain information about ^7Li(p,alpha)^4He reaction at astrophysical energies. The ^7Li(p,alpha)^4He reaction has been used and the two body reaction cross section for the ^7Li(p,alpha)^4He has been extracted together with its astropysical factor S(E).

Published
2000

118. Experimental study of the ^6Li(d, alpha)^4He reaction and its astrophysical implications via the Trojan Horse Method

Author

Pizzone, R.G., Aliotta, M., Blagus, S., Cherubini, S., Figuera, P., Lattuada, M., Milin, Matko, Miljanić, Đuro, Pellegriti, M.G., Rendić, Dubravko, Romano, S., Soić, Neven, Spitaleri, C., Zadro, Mile, Zappala, R.A., and Messina, Antonio

Subjects
Astrophysics::Earth and Planetary Astrophysics, xx
Abstract

The 6Li(d, alpha)4He reaction, whose astrophysical importance is connected to the primordial nucleosynthesis in the framework of the Inhomogeneous Big Bang, has been studied by using the Trojan Horse Method (THM). We derive and discuss the cross section and the astrophysical S(E)-factor for E_cm=0.025-0.7 MeV. Results are compared with data from a direct measurement.

Published
2000

120. Study of the ^6Li(d, alpha)^4He process at astrophysical energy by means of the quasi-free mechanism

Author

Aliotta, M., Blagus, Saša, Bogovac, Mladen, Cherubini, S., Figuera, P., Lattuada, M., Milin, Matko, Miljanić, Đuro, Pizzone, R.G., Rendić, Dubravko, Soić, Neven, Spitaleri, C., Zadro, Mile, Zappala, R.A., Prantzos, Nikos, and Harissopulos, Sotiris

Subjects
xx
Abstract

The Trojan-Horse Method (THM) has been applied to the ^6Li(^6Li, alphaalpha)^4He reaction in order to derive information on the ^6Li(d, alpha)^4He.

Published
1998

123. Erratum to “Low-energy d+d fusion reactions via the Trojan Horse Method” [Phys. Lett. B 700 (2) (2011) 111]

Author

Tumino, A., primary, Spitaleri, C., additional, Mukhamedzhanov, A.M., additional, Typel, S., additional, Aliotta, M., additional, Burjan, V., additional, del Santo, M. Gimenez, additional, Kiss, G.G., additional, Kroha, V., additional, Hons, Z., additional, La Cognata, M., additional, Lamia, L., additional, Mrazek, J., additional, Pizzone, R.G., additional, Piskor, S., additional, Rapisarda, G.G., additional, Romano, S., additional, Sergi, M.L., additional, and Spartà, R., additional

Published
2011
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124. Low-energy d+d fusion reactions via the Trojan Horse Method

Author

Tumino, A., primary, Spitaleri, C., additional, Mukhamedzhanov, A.M., additional, Typel, S., additional, Aliotta, M., additional, Burjan, V., additional, del Santo, M. Gimenez, additional, Kiss, G.G., additional, Kroha, V., additional, Hons, Z., additional, La Cognata, M., additional, Lamia, L., additional, Mrazek, J., additional, Pizzone, R.G., additional, Piskor, S., additional, Rapisarda, G.G., additional, Romano, S., additional, Sergi, M.L., additional, and Spartà, R., additional

Published
2011
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125. Spectator invariance test in the study of the Trojan Horse Method6,7Li fusion reactions via the Trojan Horse Method

Author

Pizzone, R.G., primary, Lamia, L., additional, Bertulani, C., additional, Mukhamedzhanov, A., additional, Spitaleri, C., additional, Blokhintsev, L., additional, Burjan, V., additional, Cherubini, S., additional, Hons, Z., additional, Kiss, G.G., additional, Kroha, V., additional, La Cognata, M., additional, Li, C., additional, Mrazek, J., additional, Piskoř, S., additional, Puglia, S.M.R., additional, Rapisarda, G.G., additional, Romano, S., additional, Sergi, M.L., additional, and Tumino, A., additional

Published
2011
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126. Acta Physica Polonica B

Author

Cherubini, S., primary, Spitaleri, C., additional, Gulino, M., additional, [Cognata]La Cognata, M., additional, and Pizzone, R.G., additional

Published
2011
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127. Indirect study of 11B(p,)8Be and 10B(p,α)7Be reactions at astrophysical energies by means of the Trojan Horse Method: recent results

Author

Lamia, L., primary, Puglia, S.M.R., additional, Spitaleri, C., additional, Romano, S., additional, Del Santo, M. Gimenez, additional, Carlin, N., additional, Munhoz, M. Gameiro, additional, Cherubini, S., additional, Kiss, G.G., additional, Kroha, V., additional, Kubono, S., additional, La Cognata, M., additional, Li, Cheng-Bo, additional, Pizzone, R.G., additional, Wen, Qun-Gang, additional, Sergi, M.L., additional, Szanto de Toledo, A., additional, Wakabayashi, Y., additional, Yamaguchi, H., additional, and Zhou, Shu-Hua, additional

Published
2010
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128. The 65 keV resonance in the 17O(p,α)14N thermonuclear reaction

Author

Sergi, M.L., primary, Spitaleri, C., additional, Coc, A., additional, Mukhamedzhanov, A., additional, Burjan, S.V., additional, Gulino, M., additional, Hammache, F., additional, Hons, Z., additional, Irgaziev, B., additional, Kiss, G.G., additional, Kroha, V., additional, La Cognata, M., additional, Lamia, L., additional, Pizzone, R.G., additional, de Séréville, N., additional, and Somorjai, E., additional

Published
2010
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129. On the magnitude of the 8Li + 4He → 11B + n reaction cross section at the Big-Bang temperature

Author

La Cognata, M., primary, Del Zoppo, A., additional, Figuera, P., additional, Musumarra, A., additional, Alba, R., additional, Cherubini, S., additional, Colonna, N., additional, Cosentino, L., additional, Crucillà, V., additional, Di Pietro, A., additional, Gulino, M., additional, Lamia, L., additional, Pellegriti, M.G., additional, Pizzone, R.G., additional, Puglia, S.M.R., additional, Rapisarda, G.G., additional, Rolfs, C., additional, Romano, S., additional, Sergi, M.L., additional, Spitaleri, C., additional, Tudisco, S., additional, and Tumino, A., additional

Published
2008
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130. Boron depletion: indirect measurement of the 10B(p,α)7Be S(E)-factor

Author

Lamia, L., primary, Romano, S., additional, Carlin, N., additional, Cherubini, S., additional, Crucillà, V., additional, De Moura, M.M., additional, Del Santo, M.G., additional, Munhoz, M.G., additional, Gulino, M., additional, Liguori Neto, R., additional, La Cognata, M., additional, Mudò, F., additional, Pizzone, R.G., additional, Puglia, S.M.R., additional, Sergi, M.L., additional, Souza, F.A., additional, Spitaleri, C., additional, Suaide, A.A.P., additional, Szanto, E., additional, Szanto de Toledo, A., additional, Tudisco, S., additional, and Tumino, A., additional

Published
2007
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132. Study of the 3He(d, p)4He reaction through the Trojan Horse Method

Author

La Cognata, M., primary, Musumarra, A., additional, Spitaleri, C., additional, Tumino, A., additional, Bonomo, C., additional, Cherubini, S., additional, Figuera, P., additional, Lamia, L., additional, Pellegriti, M.G., additional, Rinollo, A., additional, Pizzone, R.G., additional, Rolfs, C., additional, Romano, S., additional, Schürmann, D., additional, Strieder, F., additional, Tudisco, S., additional, and Typel, S., additional

Published
2005
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136. Bare astrophysical S(E)-factor for the 6Li(d, α)4He and 7Li(p, α)4He reactions at astrophysical energies

Author

Pizzone, R.G., primary, Spitaleri, C., additional, Lattuada, M., additional, Musumarra, A., additional, Pellegriti, M.G., additional, Romano, S., additional, Tumino, A., additional, Cherubini, S., additional, Figuera, P., additional, Miljanić, D., additional, Rolfs, C., additional, Typel, S., additional, Wolter, H.H., additional, Castellani, V., additional, Degl'Innocenti, S., additional, and Imperio, A., additional

Published
2003
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137. Indirect study of the 6Li(p, α)3He reaction at astrophysical energies

Author

Tumino, A., primary, Spitaleri, C., additional, Cherubini, S., additional, Di Pietro, A., additional, Figuera, P., additional, Gulino, M., additional, Lattuada, M., additional, Musumarra, A., additional, Pellegriti, M.G., additional, Pizzone, R.G., additional, Romano, S., additional, Rolfs, C., additional, Tudisco, S., additional, and Typel, S., additional

Published
2003
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138. The Trojan Horse Method in nuclear astrophysics

Author

Spitaleri, C., primary, Cherubini, S., additional, Del Zoppo, A., additional, Di Pietrob, A., additional, Figuerab, P., additional, Gulino, M., additional, Lattuadab, M., additional, Miljanić, Dstroke;., additional, Musumarra, A., additional, Pellegriti, M.G., additional, Pizzone, R.G., additional, Rolfs, C., additional, Romano, S., additional, Tudisco, S., additional, and Tumino, A., additional

Published
2003
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139. The elastic scattering 7Be + p at low energies: implications on the 7Be(p, γ)8Be S-factor

Author

Angulo, C., primary, Descouvemont, P., additional, Cogneau, M., additional, Couder, M., additional, Gaelens, M., additional, Leleux, P., additional, Loiselet, M., additional, Ryckewaert, G., additional, Tabacaru, G., additional, Vanderbist, F., additional, Davinson, T., additional, Azzouz, M., additional, Baye, D., additional, Di Pietro, A., additional, Figuera, P., additional, Pizzone, R.G., additional, de Oliveira Santos, F., additional, and de Séréville, N., additional

Published
2003
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140. The 7Li(p, α)4He fusion reaction studied via the trojan horse method and its astrophysical implications

Author

Pizzone, R.G., primary, Spitaleri, C., additional, Lattuada, M., additional, Musumarra, A., additional, Pellegriti, M.G., additional, Rolfs, C., additional, Miljanić, D., additional, Di Pietro, A., additional, Figuera, P., additional, Romano, S., additional, Tudisco, S., additional, Tumino, A., additional, Typel, S., additional, Wolter, H.H., additional, Castellani, V., additional, Degl'Innocenti, S., additional, and Imperio, A., additional

Published
2003
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141. Experimental determination of the Be+p scattering lengths

Author

Angulo, C., primary, Azzouz, M., additional, Descouvemont, P., additional, Tabacaru, G., additional, Baye, D., additional, Cogneau, M., additional, Couder, M., additional, Davinson, T., additional, Di Pietro, A., additional, Figuera, P., additional, Gaelens, M., additional, Leleux, P., additional, Loiselet, M., additional, Ninane, A., additional, de Oliveira Santos, F., additional, Pizzone, R.G., additional, Ryckewaert, G., additional, de Séréville, N., additional, and Vanderbist, F., additional

Published
2003
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142. The α-

Author

Spitaleri, C., primary, Aliotta, M., additional, Figuera, P., additional, Lattuada, M., additional, Pizzone, R.G., additional, Romano, S., additional, Tumino, A., additional, Rolfs, C., additional, Gialanella, L., additional, Strieder, F., additional, Cherubini, S., additional, Musumarra, A., additional, Miljanic, Đ., additional, Typel, S., additional, and Wolter, H.H., additional

Published
2000
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143. The α-12C scattering studied via the Trojan-Horse method.

Author

Spitaleri, C., Aliotta, M., Figuera, P., Lattuada, M., Pizzone, R.G., Romano, S., Tumino, A., Rolfs, C., Gialanella, L., Strieder, F., Cherubini, S., Musumarra, A., Miljanic, Đ., Typel, S., and Wolter, H.H.

Abstract

The Trojan-horse method has been suggested as a means to study a two-body reaction at astrophysical energies via a three-body breakup reaction. In order to test this method the 6Li(12C,α12C)2H reaction was studied in a kinematically complete experiment at an incident energy of 18 MeV. Coincidence spectra show the presence of the quasi-free α-12C scattering process. The excitation function of the three-body reaction is calculated in the plane wave impulse approximation assuming quasi-free scattering and is compared with the experimental data. Also, the excitation function of the virtual α-12C elastic scattering is extracted from the three-body reaction cross section at low deuteron momenta and compared with the behaviour of the free scattering cross section. [ABSTRACT FROM AUTHOR]

Published
2000
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145. Improved information on electron screening in 7Li (p,α)α using the Trojan-horse method.

Author

Aliotta, M., Spitaleri, C., Lattuada, M., Musumarra, A., Pizzone, R.G., Tumino, A., Rolfs, C., and Strieder, F.

Abstract

The available astrophysical S( E) factor data for the reaction 7Li ( p,α)α at 10 < E < 1000keV exhibit an exponential increase at low energies due to the effects of electron screening. A parametrisation of the data using a non-resonant, direct process and two subthreshold resonances reproduces the data at energies E≥ 100keV, while at lower energies this calculated Sb( E) factor curve for bare nuclides drops below the data, which in turn represent the case of electron-shielded nuclides, i.e. the electron-shielded Ss( E) factor. The comparison between Sb( E) and Ss( E) leads to an electron-screening potential energy Ue = 350eV, which is much higher than the adiabatic limit of 175eV and not understood at present. The deduced value of Sb(0) is considerably smaller than the previously adopted value of 59keV b, significantly increasing the calculated abundance of 7Li in big-bang nucleosynthesis. The Trojan-horse method was applied to the reaction 7Li ( p,α)α to determine the energy dependence of the Sb( E) factor for 10 < E < 370keV, free from the effects of the Coulomb barrier and electron screening. The THM results are close to the calculated Sb( E) curve and suggest that the THM may become a powerful way to obtain improved information on low-energy cross-sections and associated electron-screening effects in a model-independent way. [ABSTRACT FROM AUTHOR]

Published
2000
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147. On the magnitude of the 8Li + 4He →11B + n reaction cross section at the Big-Bang temperature

Author

La Cognata, M., Del Zoppo, A., Figuera, P., Musumarra, A., Alba, R., Cherubini, S., Colonna, N., Cosentino, L., Crucillà, V., Di Pietro, A., Gulino, M., Lamia, L., Pellegriti, M.G., Pizzone, R.G., Puglia, S.M.R., Rapisarda, G.G., Rolfs, C., Romano, S., Sergi, M.L., and Spitaleri, C.

Subjects
*PARTICLES (Nuclear physics), *COSMOCHEMISTRY, *ASTROPHYSICS, *NUCLEAR physics
Abstract

Abstract: The 8Li + 4He →11B + n reaction at is a process of relevant astrophysical interest for which a remarkable experimental discrepancy between inclusive and exclusive cross-section measurements exists. In this Letter, a new inclusive neutron measurement at is given. The radioactive 8Li beam was delivered by the EXCYT facility. The cross section was determined by a low-background measurement of the time correlation between the 8Li projectile arrival to the target and the following neutron capture in a threshold-less 4π thermalization counter. This new data strengthens the reliability of the previous inclusive reaction cross-section data and altogether are consistent with a significant population of 11B levels at high excitation energy. [Copyright &y& Elsevier]

Published
2008
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148. Study of the 3 He(d, p)4 He reaction through the Trojan Horse Method

Author

La Cognata, M., Musumarra, A., Spitaleri, C., Tumino, A., Bonomo, C., Cherubini, S., Figuera, P., Lamia, L., Pellegriti, M.G., Rinollo, A., Pizzone, R.G., Rolfs, C., Romano, S., Schürmann, D., Strieder, F., Tudisco, S., and Typel, S.

Subjects
*NUCLEAR reactions, *SCATTERING (Physics), *APPROXIMATION theory, *NUCLEAR physics
Abstract

The astrophysically relevant 3 He(d, p)4 He reaction was indirectly studied by means of the Trojan Horse Method applied to the 6 Li(3 He, pα)4 He three body process performed at 5 and 6 MeV. The bare astrophysical S(E)-factor extracted in Modified Plane Wave Born Approximation was compared with the free behaviour and an independent estimate of the screening potential was obtained, confirming the discrepancy with the adiabatic limit. [Copyright &y& Elsevier]

Published
2005
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150. The Trojan-Horse Method applied to the 6Li(p,α)3He reaction down to astrophysical energies

Author

Tumino, A., Spitaleri, C., Pappalardo, L., Cherubini, S., Del Zoppo, A., La Cognata, M., Musumarra, A., Pellegriti, M.G., Pizzone, R.G., Rinollo, A., Romano, S., and Typel, S.

Subjects
*NUCLEAR reactions, *NUCLEAR energy, *ASTROPHYSICS, *NUCLEAR physics
Abstract

The Trojan-Horse Method has been applied to the three-body d(6Li,α3He)n break-up reaction in order to extract the bare nucleus S(E) factor for the 6Li(p,α)3He down to astrophysical energies. [Copyright &y& Elsevier]

Published
2004
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