25 results on '"IMBRIANI, GIANLUCA"'
Number of results to display per page
Search Results
2. New measurement of 7Be half-life in different metallic environments
- Author
-
Lucio Gialanella, F. Raiola, Gianluca Imbriani, Filippo Terrasi, Frank Strieder, B. Limata, Zs. Fülöp, Detlef Rogalla, E. Somorjai, Mario R. Romano, Antonio Esposito, Antonio D'Onofrio, Vincenzo Roca, D. Schürmann, N. De Cesare, C. Rolfs, Gy. Gyürky, B. N., Limata, Z., Fulop, D., Shuerman, N., De Cesare, D'Onofrio, A. n. t., A., Esposito, L., Gialanella, G., Gyurky, Imbriani, Gianluca, F., Raiola, Roca, Vincenzo, D., Rogalla, C., Rolf, M., Romano, M., Somorjai, F., Strider, F., Terrasi, Limatala, Bn, Fulop, Z, Schurmann, D, De Cesare, N, D'Onofrio, Antonio, Esposito, A, Gialanella, Lucio, Gyurky, G, Imbriani, G, Raiola, F, Roca, V, Rogalla, D, Rolfs, C, Romano, M, Somorjai, E, Strieder, F, and Terrasi, Filippo
- Subjects
Physics ,Nuclear and High Energy Physics ,Electron density ,Zirconium ,Ion beam ,Electron capture ,Gamma ray ,Tantalum ,chemistry.chemical_element ,Electron ,Tungsten ,Nuclear physics ,Radioactivity ,chemistry ,half life ,Atomic physics - Abstract
(7)Be decays via electron capture and therefore its half-life is expected to depend on the electron density at the nucleus. We measured the (7)Be half-life in palladium, tungsten, zirconium and tantalum metals, in order to investigate the influence of the quasi-free electrons in metals on the probability of electron capture. The (7)Be samples were obtained implanting a 4.85 MeV pure radioactive (7)Be ion beam. The (7)Be half-life was determined measuring the 478 keV gamma decay following the electron capture by means of HPGe detectors. In order to reduce systematic errors, we planned to perform independent measurements in three different laboratories: Naples (Italy), Bochum (Germany) and Debrecen (Hungary). On the basis of the first results, we do not find a (7)Be half-life change within the experimental errors of 0.4%. RI Fulop, Zsolt/B-2262-2008
- Published
- 2006
- Full Text
- View/download PDF
3. Enhanced d(d,p)t fusion reaction in metals
- Author
-
Hans Werner Becker, H. Luis, Carlo Broggini, F. Raiola, M. Junker, Antonio D'Onofrio, Mario R. Romano, Gianluca Imbriani, Marialuisa Aliotta, B. Limata, Filippo Terrasi, João Cruz, S. Zeng, Lucio Gialanella, Vincenzo Roca, M. Fonseca, Frank Strieder, Zs. Fülöp, J.P. Ribeiro, A. P. Jesus, C. Rolfs, Gy. Gyürky, B. Burchard, A. Di Leva, E. Somorjai, F., Raiola, B., Burchard, Fülöp, Z. s., Gyürky, G. y., S., Zeng, J., Cruz, DI LEVA, Antonino, Limata, BENEDICTA NORMANNA, M., Fonseca, H., Lui, M., Aliotta, H. W., Becker, C., Broggini, A., D'Onofrio, L., Gialanella, Imbriani, Gianluca, A. P., Jesu, M., Junker, J. P., Ribeiro, Roca, Vincenzo, C., Rolf, Romano, Mario, E., Somorjai, F., Strieder, F., Terrasi, Raiola, F, Burchard, B, Fulop, Z, Gyurky, Gy, Zeng, S, Cruz, J, Di Leva, A, Limata, B, Fonseca, M, Luis, H, Aliotta, M, Becker, Hw, Broggini, C, D'Onofrio, Antonio, Gialanella, Lucio, Imbriani, G, Jesus, Ap, Junker, M, Ribeiro, Jp, Roca, V, Rolfs, C, Romano, M, Somorjai, E, Strieder, F, and Terrasi, Filippo
- Subjects
Lanthanide ,Physics ,electron screening ,Nuclear and High Energy Physics ,Hydrogen ,Screening effect ,Analytical chemistry ,chemistry.chemical_element ,Metal ,symbols.namesake ,Deuterium ,chemistry ,visual_art ,visual_art.visual_art_medium ,symbols ,Debye temperature ,Atomic physics ,Solubility ,Valence electron ,deuterated metal ,Debye model - Abstract
The electron screening in the d(d,p)t reaction has been studied for the deuterated metal Pt at a target temperature T = 20 degrees C to 340 degrees C, and for Co at T = 20 degrees C and 200 degrees C. The enhanced electron screening decreases with increasing temperature, where the data agree with the plasma model of Debye applied to the quasi-free metallic electrons. The data represent the first observation of a temperature dependence of a nuclear cross-section. We also measured the screening effect for the deuterated metal Ti (an element of group 4 of the periodic table) at T = -10 degrees C to 200 degrees C: above 50 degrees C the hydrogen solubility dropped to values far below unity and a large screening effect became observable. Similarly, all metals of groups 3 and 4 and the lanthanides showed a solubility of a few percent at T = 200 degrees C (compared to T = 20 degrees C) and a large screening became also observable. Within the Debye model the deduced number of valence electrons per metallic atom agrees with the corresponding number from the Hall coefficient, for all metals investigated. RI Fulop, Zsolt/B-2262-2008; Aliotta, Marialuisa /H-2567-2012
- Published
- 2006
- Full Text
- View/download PDF
4. Electron screening in d(d, p)t for deuterated metals: temperature effects
- Author
-
F Raiola, the LUNA Collaboration, B Burchard, Z Fülöp, G Gyürky, S Zeng, J Cruz, A Di Leva, B Limata, M Fonseca, H Luis, M Aliotta, H W Becker, C Broggini, A DÒnofrio, L Gialanella, G Imbriani, A P Jesus, M Junker, J P Ribeiro, V Roca, C Rolfs, M Romano, E Somorjai, F Strieder, F Terrasi, F., Raiola, the LUNA, Collaboration, B., Burchard, Z., Fülöp, G., Gyürky, S., Zeng, J., Cruz, DI LEVA, Antonino, Limata, BENEDICTA NORMANNA, M., Fonseca, H., Lui, M., Aliotta, H. W., Becker, C., Broggini, A., Dònofrio, L., Gialanella, Imbriani, Gianluca, A. P., Jesu, M., Junker, J. P., Ribeiro, Roca, Vincenzo, C., Rolf, Romano, Mario, E., Somorjai, F., Strieder, and F., Terrasi
- Subjects
Physics ,Nuclear and High Energy Physics ,Hydrogen ,Screening effect ,Analytical chemistry ,chemistry.chemical_element ,Metal ,symbols.namesake ,Deuterium ,chemistry ,visual_art ,Atom ,visual_art.visual_art_medium ,symbols ,Solubility ,Atomic physics ,Valence electron ,Debye model - Abstract
The electron screening in the d(d, p)t reaction has been studied for the deuterated metal Pt at a sample temperature T = 20 ◦C–340 ◦C and for Co at T = 20 ◦C and 200 ◦C. The enhanced electron screening decreases with increasing temperature, where the data agree with the plasma model of Debye applied to the quasi-free metallic electrons. The data represent the first observation of a temperature dependence of a nuclear cross section. We also measured the screening effect for the deuterated metal Ti (an element of group 4 of the periodic table) at T = −10 ◦C–200 ◦C: above 50 ◦C, the hydrogen solubility dropped to values far below 1 and a large screening effect became observable. Similarly, all metals of groups 3 and 4 and the lanthanides showed a solubility of a few per cent at T=200 ◦C (compared to T=20 ◦C) and a large screening also became observable. Within the Debye model, the deduced number of valence electrons per metallic atom agrees with the corresponding number from the Hall coefficient, for all metals investigated. (Some figures in this article are in colour only in the
- Published
- 2005
- Full Text
- View/download PDF
5. Recoil separator ERNA: acceptances in angle and energy
- Author
-
Gianluca Imbriani, A. Ordine, H. P. Trautvetter, Marialuisa Aliotta, Filippo Terrasi, Lucio Gialanella, Frank Strieder, N. DeCesare, J. Kluge, Detlef Rogalla, H. Röcken, D. Schürmann, Mario R. Romano, Carmine Lubritto, A. DiLeva, Vincenzo Roca, Antonio D'Onofrio, C. Rolfs, F. Schümann, D., Rogalla, D., Schürmann, F., Strieder, M., Aliotta, N., Decesare, DI LEVA, Antonino, C., Lubritto, A., D’Onofrio, L., Gialanella, Imbriani, Gianluca, J., Kluge, A., Ordine, Roca, Vincenzo, H., Röcken, C., Rolf, Romano, Mario, F., Schümann, F., Terrasi, H. P., Trautvetter, Rogalla, D, Schurmann, D, Strieder, F, Aliotta, M, Di Leva, A, Lubritto, Carmine, De Cesare, N, D'Onofrio, Antonio, Gialanella, Lucio, Imbriani, G, Klug, J, Ordine, A, Roca, V, Rocken, H, Rolfs, C, Romano, M, Schumann, F, Terrasi, Filippo, and Trauttvetter, H. P.
- Subjects
Physics ,Nuclear and High Energy Physics ,Range (particle radiation) ,Electromagnetic radiation ,Recoil separator ,Nuclear physics ,Cross section (physics) ,Nuclear Astrophysics ,Atomic physics ,Experimental nuclear physic ,Nuclear Experiment ,Dynamitron ,Instrumentation ,Energy (signal processing) ,Beam (structure) ,Oxygen-16 - Abstract
For improved cross-section measurements of the reaction 12C(α,γ)16O in inverted kinematics, a recoil separator ERNA is developed at the 4MV Dynamitron tandem accelerator in Bochum to detect directly the 16O recoils with high efficiency. Due to the emission of the capture γ-rays, the kinematically forward directed 16O recoils are described by an angle and energy spread. Thus, the acceptances in angle and energy of ERNA must cover these spreads in order to extract reliable cross-section values. We report on such acceptance measurements over the energy range Ecm=0.7-5.0 MeV, using an 16O pilot beam. © 2003 Elsevier B.V. All rights reserved.
- Published
- 2003
- Full Text
- View/download PDF
6. Charge state studies of low energy heavy ions passing through hydrogen and helium gas
- Author
-
John D'Auria, Mario R. Romano, Gianluca Imbriani, L. Buchmann, A Olin, J. Rogers, W. Liu, A. Chen, D. A. Hutcheon, D. Hunter, Uwe Greife, Antonio D'Onofrio, Filippo Terrasi, S. Engel, Detlef Rogalla, Lucio Gialanella, D Ottewell, Ahmed Hussein, G. Roy, Liu, W, Imbriani, G, Buchmann, L, Chen, Aa, D'Auria, Jm, D'Onofrio, Antonio, Engel, S, Gialanella, Lucio, Greife, U, Hunter, D, Hussein, A, Hutcheon, Da, Olin, A, Ottewell, D, Rogalla, D, Rogers, J, Romano, M, Roy, G, Terrasi, Filippo, Liu, W., Imbriani, Gianluca, Buchmann, L., Chen, A. A., D'Auria, J. M., D'Onofrio, A., Engel, S., Gialanella, L., Greife, U., Hunter, D., Hussein, A., Hutcheon, D. A., Olin, A., Ottewell, D., Rogalla, D., Rogers, J., Romano, Mario, Roy, G., and Terrasi, F.
- Subjects
Physics ,Nuclear and High Energy Physics ,Hydrogen ,Helium gas ,chemistry.chemical_element ,Charge (physics) ,State (functional analysis) ,Experimental Nuclear Physics ,Ion ,Low energy ,chemistry ,Charge state distribution ,Atomic physics ,Nuclear Experiment ,State distribution ,Instrumentation ,Beam energy - Abstract
Studies of the charge state distribution of low energy (< 1.5 MeV/u), low Z (< 13) heavy ions passing through hydrogen and helium gas of varying target pressure have been performed using separate windowless gas target systems at TRIUMF and the University of Naples. Semi-empirical relationships have been deduced to estimate the equilibrium charge state distributions as a function of beam energy. From these distributions, cross-sections for the relevant charge changing reactions have been deduced. (C) 2002 Elsevier Science B.V. All rights reserved.
- Published
- 2003
- Full Text
- View/download PDF
7. Absolute cross section of 7Be(p,γ)8B
- Author
-
Uwe Greife, Zs. Fülöp, F. Schümann, L. Campajola, Antonio D'Onofrio, Gianluca Imbriani, C. Rolfs, Lucio Gialanella, Vincenzo Roca, P. Corvisiero, Paolo Prati, Frank Strieder, Sandra Zavatarelli, G. Gervino, Oscar Straniero, H. Costantini, A. Ordine, Filippo Terrasi, A. Formicola, E. Somorjai, Carlo Broggini, C. Gustavino, P. G. Prada Moroni, A. Guglielmetti, R. Bonetti, Gy. Gyürky, H. P. Trautvetter, M. Junker, Mario R. Romano, Detlef Rogalla, F., Strieder, L., Gialanella, G., Gyürky, F., Schümann, R., Bonetti, C., Broggini, L., Campajola, P., Corvisiero, H., Costantini, A., D'Onofrio, A., Formicola, Z., Fülöp, G., Gervino, U., Greife, A., Guglielmetti, C., Gustavino, Imbriani, Gianluca, M., Junker, P. G. P., Moroni, A., Ordine, P., Prati, Roca, Vincenzo, D., Rogalla, C., Rolf, Romano, Mario, E., Somorjai, O., Straniero, F., Terrasi, H. P., Trautvetter, and S., Zavatarelli
- Subjects
Experimental Nuclear Physic ,Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Cross section (physics) ,Radiative capture ,Zero-point energy ,Nuclide ,Atomic physics ,Experimental Nuclear Astrophysic ,Solar neutrino ,Stellar hydrogen burning - Abstract
The absolute cross section σ ( E ) for the radiative capture reaction 7 Be(p, γ ) 8 B at the center-of-mass energies E =0.32 to 2.61 MeV has been measured using a 7 Be target deposited on a Cu backing and observing the β -delayed α -particles from 8 B. The backing causes a loss of less than 1% of the 8 B residual nuclides. The resulting astrophysical S ( E ) factor at zero energy, S (0)=18.4±1.6 eV b, is consistent only with a restricted data set from previous work.
- Published
- 2001
- Full Text
- View/download PDF
8. Change of the 7Be electron capture half-life in metallic environments
- Author
-
Detlef Rogalla, Vincenzo Roca, A. P. Jesus, E. Somorjai, Antonio D'Onofrio, S. Yan, C. Rolfs, Zsolt Fülöp, D. Schürmann, Hans Werner Becker, N. De Cesare, Frank Strieder, Lucio Gialanella, Mario R. Romano, B. Limata, Gyuri Gyürky, F. Raiola, Gianluca Imbriani, Marialuisa Aliotta, Filippo Terrasi, João Cruz, J.P. Ribeiro, B. Wang, Wang, B., Yan, S., Limata, B., Raiola, F., Aliotta, M., Becker, H. W., Cruz, J., de Cesare, N., D'Onofrio, A., Fülöp, Z., Gialanella, L., Gyürky, G., Imbriani, Gianluca, Jesus, A., Ribeiro, J. P., Roca, Vincenzo, Rogalla, D., Rolfs, C., Romano, Mario, Schürmann, D., Somorjai, E., Strieder, F., and Terrasi, F.
- Subjects
Free electron model ,Physics ,Nuclear and High Energy Physics ,Condensed matter physics ,Electron capture ,Hadron ,Insulator (electricity) ,Plasma ,Electron ,half-life 7Be ,symbols.namesake ,symbols ,Nuclear fusion ,Atomic physics ,Debye - Abstract
For the electron capture of Be-7 in the metallic environments Pd and In the Be-7 half-life was observed to increase by 0.9 +/- 0.2 and 0.7 +/- 0.2%, respectively, while in the insulator Li2O it was unchanged within experimental error (all samples cooled to T = 12K). The observations are consistent with the predictions of the Debye plasma model applied to the quasi-free electrons in the metals.
- Published
- 2006
- Full Text
- View/download PDF
9. A windowless hydrogen gas target for the measurement of 7Be(p,g)8B with the recoil separator ERNA
- Author
-
Gianluca Imbriani, Antonio D'Onofrio, D. Schürmann, M. Romoli, N. De Cesare, A. Di Leva, Lucio Gialanella, Filippo Terrasi, M. De Cesare, Mario R. Romano, D., Schuermann, DI LEVA, Antonino, L., Gialanella, M., De Cesare, N., De Cesare, Imbriani, Gianluca, A., D'Onofrio, Romano, Mario, M., Romoli, and F., Terrasi
- Subjects
Physics ,Nuclear and High Energy Physics ,Hydrogen ,Physics::Instrumentation and Detectors ,Hadron ,windowless gas target ,chemistry.chemical_element ,Recoil separator ,Characterization (materials science) ,Nuclear physics ,Cross section (physics) ,chemistry ,Experimental Nuclear Astrophysics ,Nuclear fusion ,Atomic physics ,Nuclear Experiment - Abstract
A new measurement of the cross section of 7Be(p, $ \gamma$ )8B will be done in inverted kinematics with the recoil separator ERNA at the CIRCE laboratory in Caserta, Italy. The 8B recoils will be produced in a windowless hydrogen gas target. We report here on the construction and characterization of the gas cell. In detail we describe measurements for target density, the profile determination via the 7Li(p, p’)7Li* reaction as well as the role and performance of a gaseous post-stripper.
- Published
- 2013
10. The25Mg(p, γ)26Al reaction at low astrophysical energies
- Author
-
A. Best, M. Junker, Antonio Caciolli, E. Somorjai, C. Rolfs, A. Lemut, Z. Elekes, P. Corvisiero, C. Gustavino, Oscar Straniero, Frank Strieder, Gianluca Imbriani, Michele Marta, Filippo Terrasi, A. Formicola, C. Rossi Alvarez, Daniel Bemmerer, H. P. Trautvetter, Vincenzo Roca, A. DiLeva, Paolo Prati, Zsolt Fülöp, B. Limata, Roberto Menegazzo, Gyuri Gyürky, G. Gervino, A. Guglielmetti, H. Costantini, Carlo Broggini, C. Mazzocchi, F., Strieder, Limata, BENEDICTA NORMANNA, A., Formicola, Imbriani, Gianluca, M., Junker, D., Bemmerer, Best, Andrea, C., Broggini, A., Caciolli, P., Corvisiero, H., Costantini, DI LEVA, Antonino, Z., Eleke, Fülöp, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, Gyürky, G. y., A., Lemut, M., Marta, C., Mazzocchi, R., Menegazzo, P., Prati, Roca, Vincenzo, C., Rolf, C., Rossi Alvarez, E., Somorjai, O., Straniero, F., Terrasi, and H. P., Trautvetter
- Subjects
Physics ,Nuclear and High Energy Physics ,Nuclear astrophysic ,Physics::Instrumentation and Detectors ,Astrophysics::High Energy Astrophysical Phenomena ,Resolution (electron density) ,Resonance ,Mg-Al cycle ,Nuclear astrophysics ,Proton-capture reaction ,Reaction rate ,Resonance strength ,Crystal ,Nuclear physics ,Underground laboratory ,High Energy Physics::Experiment ,Atomic physics ,Hpge detector ,Nuclear Experiment - Abstract
In the present work we report on a new measurement of resonance strengths in the reaction 25Mg(p,gamma)26Al at E_cm= 92 and 189 keV. This study was performed at the LUNA facility in the Gran Sasso underground laboratory using a 4pi BGO summing crystal. For the first time the 92 keV resonance was directly observed and a resonance strength omega-gamma=(2.9+/-0.6)x10E-10 eV was determined. Additionally, the gamma-ray branchings and strength of the 189 keV resonance were studied with a high resolution HPGe detector yielding an omega-gamma value in agreement with the BGO measurement, but 20% larger compared to previous works.
- Published
- 2012
11. Elastic scattering of protons from 15N
- Author
-
Ethan Uberseder, P. J. LeBlanc, Michael Wiescher, S. O'Brien, S. Falahat, Richard deBoer, G. Imbriani, Joachim Görres, R., Deboer, P., Leblanc, S., Falahat, Imbriani, Gianluca, J., Görre, S., O’Brien, E., Uberseder, and M., Wiescher
- Subjects
Elastic scattering ,Physics ,Nuclear and High Energy Physics ,Proton ,Order (ring theory) ,Nuclear reaction ,CNO cycle ,Excited state ,Yield ratio ,Atomic physics ,Experimental nuclear physic ,Energy (signal processing) ,Excitation ,Spin-½ - Abstract
Background: Resonances observed through elastic scattering of protons on ${}^{15}$N can provide information about the partial widths, spin parities, and energies of excited states in ${}^{16}$O near the proton separation energy. This is the same energy region important for the nuclear astrophysics reactions ${}^{15}$N${(p,\ensuremath{\gamma})}^{16}$O and ${}^{15}$N${(p,\ensuremath{\alpha})}^{12}$C. While previous measurements have been made, they are limited in scope, especially in their angular coverage. Purpose: Obtain additional ${}^{15}$N${(p,p)}^{15}$N reaction data which can be used in a global multiple-channel $R$-matrix analysis of the ${}^{16}$O compound nucleus in order to better constrain the level parameters of states which contribute to the reaction ${}^{15}$N${(p,\ensuremath{\gamma})}^{16}$O. Methods: Measure the excitation functions of ${}^{15}$N${(p,p)}^{15}$N over an energy range from ${E}_{p}$ $=$ 0.6 to 1.8 MeV at laboratory angles of 90${}^{\ensuremath{\circ}}$, 105${}^{\ensuremath{\circ}}$, 135${}^{\ensuremath{\circ}}$, 150${}^{\ensuremath{\circ}}$, and 165${}^{\ensuremath{\circ}}$. The reaction ${}^{15}$N${(p,{\ensuremath{\alpha}}_{0})}^{12}$C was measured concurrently. Results: Ratios of the excitation functions were extracted from the yield data. Resonances were identified in the yield ratio data which correspond to previously reported levels in ${}^{16}$O. An $R$-matrix analysis, which fits the present data as well as previous measurements from the literature simultaneously, finds reasonable agreement between the current measurements and those in the literature. Conclusions: The additional data from this measurement will be combined with previous literature data in a comprehensive $R$-matrix analysis of reactions which populate ${}^{16}$O over a similar energy region.
- Published
- 2012
12. Recoil separator ERNA: improved measurements of the astrophysical key reaction 12C(α,γ)16O
- Author
-
Gianluca Imbriani, H. P. Trautvetter, L. Campajola, Lucio Gialanella, Vincenzo Roca, C. Rolfs, Frank Strieder, Uwe Greife, Mario R. Romano, Detlef Rogalla, Marialuisa Aliotta, Filippo Terrasi, A. Ordine, S. Theis, C. A. Barnes, Antonio D'Onofrio, F. Schümann, Carlo Sabbarese, D. Schürmann, D., Rogalla, M., Aliotta, C. A., Barne, L., Campajola, A., D'Onofrio, L., Gialanella, U., Greife, Imbriani, Gianluca, A., Ordine, Roca, Vincenzo, C., Rolf, Romano, Mario, C., Sabbarese, D., Schürmann, F., Schümann, F., Strieder, S., Thei, F., Terrasi, and H. P., Trautvetter
- Subjects
Experimental Nuclear Physic ,Physics ,Nuclear physics ,Nuclear and High Energy Physics ,Range (particle radiation) ,Nuclear Astrophysics ,Nuclear astrophysics ,Atomic physics ,Tandem accelerator ,Nuclear Experiment ,Dynamitron ,Recoil separator - Abstract
The recoil separator ERNA (European Recoil Separator for Nuclear Astrophysics) for improved measurements of the astrophysical key reaction C-12(alpha, gamma)O-16 is being developed at the 4 MV Dynamitron tandem accelerator in Bochum to detect directly the O-16 recoils. The total detection efficiency of about 50 % allows direct measurements in a much wider energy range than previously accessible. In addition this technique allows improved measurements not hampered by cosmic background problems when compared to gamma -ray detection.
- Published
- 2001
- Full Text
- View/download PDF
13. Absolute cross section of p(7Be,γ)8B using a novel approach
- Author
-
C. Rolfs, A. Ordine, Gianluca Imbriani, Gyuri Gyürky, Filippo Terrasi, Antonio D'Onofrio, Mario R. Romano, E. Somorjai, Lucio Gialanella, Carlo Sabbarese, H. P. Trautvetter, L. Campajola, Detlef Rogalla, Uwe Greife, Vincenzo Roca, Frank Strieder, G. Oliviero, L., Gialanella, F., Strieder, L., Campajola, A., D'Onofrio, U., Greife, G., Gyurky, Imbriani, Gianluca, G., Oliviero, A., Ordine, Roca, Vincenzo, C., Rolf, Romano, Mario, D., Rogalla, C., Sabbarese, E., Somorjai, F., Terrasi, H. P., Trautvetter, Gialanella, L., Strieder, F., Campajola, L., D'Onofrio, A., Greife, U., Gyurky, G., Imbriani, G., Oliviero, G., Ordine, A., Roca, V., Rolfs, C., Romano, M., Rogalla, D., Sabbarese, C., Somorjai, E., Terrasi, F., and Trautvetter, H. P.
- Subjects
Physics ,Elastic scattering ,Nuclear and High Energy Physics ,Ion beam ,Experimental Nuclear physic ,Solar neutrinos ,Nuclear physics ,Momentum ,symbols.namesake ,Cross section (physics) ,Yield (chemistry) ,symbols ,Nuclear fusion ,Nuclear Astrphysic ,Rutherford scattering ,Nuclide ,Atomic physics - Abstract
The absolute cross section sigma(E) of the radiative capture reaction p(Be-7,gamma)B-8 at the center-of mass energy E = 992 keV has been measured using a radioactive 7Be ion beam and a windowless gas target system filled with H-2 gas. The B-8 residual nuclides were detected with a recoil separator consisting of momentum and velocity filters and a BE E detector telescope. The B-8 yield was observed concurrently with the Be-7+p elastic scattering yield, relating sigma(E) to the Rutherford scattering cross section. The resulting value, sigma(E) = 0.41+/-0.11 mu b, leads to an S(E) factor at zero energy of S(0) = 16+/-4 eV b, in fair agreement with recommended values.
- Published
- 2000
- Full Text
- View/download PDF
14. CNO hydrogen burning studied deep underground
- Author
-
C. Rolfs, Daniel Bemmerer, Gy. Gyürky, Carlo Broggini, C. Rossi Alvarez, R. Menegazzo, R. Bonetti, F. Schümann, H. P. Trautvetter, G. Gervino, B. Limata, Gianluca Imbriani, Oscar Straniero, Frank Strieder, Filippo Terrasi, João Cruz, A. P. Jesus, F. Confortola, M. Junker, A. Guglielmetti, Mario R. Romano, A. Formicola, Zs. Fülöp, A. Lemut, H. Costantini, Detlef Rogalla, C. Gustavino, Vincenzo Roca, Paolo Prati, E. Somorjai, P. Corvisiero, Bemmerer, D., Confortola, F., Lemut, A., Bonetti, R., Broggini, C., Corvisiero, P., Costantini, H., Cruz, J., Formicola, A., Fulop, Z. s., Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, G. y., Imbriani, Gianluca, Jesus, A. P., Junker, M., Limata, B., Menegazzo, R., Prati, P., Roca, Vincenzo, Rogalla, D., Rolfs, C., Romano, Mario, Rossi Alvarez, C., Schuemann, F., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., Trautvetter, H. P., D., Bemmerer, A., Lemut, R., Bonetti, C., Broggini, P., Corvisiero, H., Costantini, J., Cruz, A., Formicola, Z., Fulop, G., Gervino, A., Guglielmetti, C., Gustavino, G., Gyurky, G., Imbriani, A. P., Jesu, M., Junker, B., Limata, R., Menegazzo, P., Prati, V., Roca, D., Rogalla, C., Rolf, M., Romano, C., ROSSI ALVAREZ, F., Schu, Mann, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, and H. P., Trautvetter
- Subjects
Physics ,Nuclear and High Energy Physics ,CNO cycle ,Hydrogen ,and linear accelerators - X- and γ-ray spectroscopy ,collective ,Extrapolation ,chemistry.chemical_element ,Alpha particle ,Radiative capture - Hydrostatic stellar nucleosynthesis - Electrostatic ,Nuclear physics ,chemistry ,Excited state ,Nuclear astrophysics ,Nuclear fusion ,Atomic physics ,Ground state - Abstract
In stars, four hydrogen nuclei are converted into a helium nucleus in two competing nuclear fusion processes, namely the proton-proton chain (p-p chain) and the carbon-nitrogen-oxygen (CNO) cycle. For temperatures above 20 million kelvin, the CNO cycle dominates energy production, and its rate is determined by the slowest process, the 14N(p,γ)15O radiative capture reaction. This reaction proceeds through direct and resonant capture into the ground state and several excited states in 15O. High energy data for capture into each of these states can be extrapolated to stellar energies using an R-matrix fit. The results from several recent extrapolation studies are discussed. A new experiment at the LUNA (Laboratory for Underground Nuclear Astrophysics) 400kV accelerator in Italy's Gran Sasso laboratory measures the total cross section of the 14N(p,γ)15O reaction with a windowless gas target and a 4π BGO summing detector, down to center of mass energies as low as 70keV. After reviewing the characteristics of the LUNA facility, the main features of this experiment are discussed, as well as astrophysical scenarios where cross section data in the energy range covered have a direct impact, without any extrapolation.
- Published
- 2006
15. Electron Screening: A Review
- Author
-
Antonio D'Onofrio, K. U. Kettner, E. Somorijai, L. Gang, Gianluca Imbriani, H. Luis, Marialuisa Aliotta, Filippo Terrasi, B. Burchard, João Cruz, S. Zeng, Vincenzo Roca, C. Rolfs, Carlo Broggini, F. Raiola, L. Gialanella, B. Limata, Gyuri Gyürky, Hans Werner Becker, A. Di Leva, M. Junker, Mario R. Romano, J.P. Ribeiro, A. P. Jesus, D. Schürmann, Frank Strieder, Zsolt Fülöp, M. Fonseca, F., Raiola, J., Cruz, G., Gyürky, Z., Fülöp, S., Zeng, M., Aliotta, H. W., Becker, B., Burchard, C., Broggini, DI LEVA, Antonino, A., D'Onofrio, M., Fonseca, L., Gang, L., Gialanella, Imbriani, Gianluca, A. P., Jesu, M., Junker, K. U., Kettner, B., Limata, H., Lui, J. P., Ribeiro, Roca, Vincenzo, C., Rolf, M., Romano, D., Schürmann, E., Somorijai, F., Strieder, and F., Terrasi
- Subjects
symbols.namesake ,Screening effect ,Chemistry ,Atom ,symbols ,Electron ,Plasma ,Atomic physics ,Valence electron ,Debye length ,Debye model ,Debye - Abstract
Understanding the electron screening effect in the laboratory is critical for a correct interpretation of low‐energy nuclear reactions in stars. Extensive studies of the electron screening effect in deuterated metals (54 metals) and other environments have been carried out in Bochum in the last 4 years. Experimental results of anomalous enhancements have been interpreted in terms of the Debye plasma model applied to quasi‐free metallic electrons. For the d(d,p)t reaction in metallic environments, the variation of hydrogen solubility in the samples as a function of temperature has also been measured, showing an anti‐correlation with screening enhancement as expected. Within this model, the deduced number of valence electrons per metallic atom also agrees with the corresponding number from the Hall coefficient. Recently, the expected temperature dependence of the screening potential has been verified together with the expected Zt scaling (with the metallic host) of the Debye radius. Preliminary results on the 7Li(p,α) and 6Li(p,α) reactions in Li2WO4 insulator, Li metal and PdLi alloys confirm the expected behaviour of the screening effect and further supports the applicability of the Debye model. Indeed, the proposed model also accounts for the high screening potential (Ue = 900±50 eV) observed in previous studies of the reactions 9Be(p,α) and 9Be(p,d), which was not understood at the time. A review of all these results will be presented.
- Published
- 2006
- Full Text
- View/download PDF
16. First measurement of the 14N(p,gamma)15O cross section down to 70 keV
- Author
-
Carlo Broggini, Gianluca Imbriani, R. Bonetti, C. Rossi Alvarez, F. Confortola, Oscar Straniero, A. Guglielmetti, Filippo Terrasi, Daniel Bemmerer, Vincenzo Roca, João Cruz, B. Limata, Frank Strieder, Paolo Prati, G. Gervino, H. Costantini, P. Corvisiero, A. Formicola, A. P. Jesus, Zs. Fülöp, E. Somorjai, Gy. Gyürky, C. Rolfs, Detlef Rogalla, F. Schümann, C. Gustavino, Roberto Menegazzo, H. P. Trautvetter, M. Junker, Mario R. Romano, A. Lemut, A., Lemut, D., Bemmerer, F., Confortola, R., Bonetti, C., Broggini, Corvisiero, _. P., H., Costantini, J., Cruz, A., Formicola, Fulop, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, Gyurky, G. y., Imbriani, Gianluca, A. P., Jesu, M., Junker, B., Limata, R., Menegazzo, P., Prati, Roca, Vincenzo, D., Rogalla, C., Rolf, Romano, Mario, C., Rossi Alvarez, F., Shumann, E., Somorjai, O., Straniero, F., Strieder, and F., Terrasi
- Subjects
Nuclear and High Energy Physics ,CNO cycle ,Explosive material ,Hydrogen ,Cross section measurement ,14N(p, γ)15O ,AGB stars ,Hydrogen shell burning ,Radiative capture ,Underground nuclear astrophysics ,Thermonuclear reaction ,chemistry.chemical_element ,FOS: Physical sciences ,Astrophysics ,Resonance (particle physics) ,γ)15O ,Nuclear physics ,Cross section (physics) ,14N(p ,Nuclear Experiment (nucl-ex) ,Nuclear Experiment ,Physics ,Detector ,Astrophysics (astro-ph) ,Stars ,chemistry ,Atomic physics - Abstract
In stars with temperatures above 20 × 10 6 K , hydrogen burning is dominated by the CNO cycle. Its rate is determined by the slowest process, the 14N(p, γ)15O reaction. Deep underground in Italy's Gran Sasso laboratory, at the LUNA 400 kV accelerator, the cross section of this reaction has been measured at energies much lower than ever achieved before. Using a windowless gas target and a 4π BGO summing detector, direct cross section data has been obtained down to 70 keV, reaching a value of 0.24 picobarn. The Gamow peak has been covered by experimental data for several scenarios of stable and explosive hydrogen burning. In addition, the strength of the 259 keV resonance has been remeasured. The thermonuclear reaction rate has been calculated for temperatures 90 – 300 × 10 6 K , for the first time with negligible impact from extrapolations.
- Published
- 2006
- Full Text
- View/download PDF
17. Decay of 7Be in metallic environment
- Author
-
Lucio Gialanella, Gianluca Imbriani, Frank Strieder, Zs. Fülöp, Mario R. Romano, C. Rolfs, D. Schürmann, Gy. Gyürky, Filippo Terrasi, B. Limata, Antonio D'Onofrio, F. Raiola, E. Somorjai, Detlef Rogalla, N. De Cesare, Vincenzo Roca, Fülöp, Z. s., Gyürky, G. y., E., Somorjai, D., Schürmann, F., Raiola, F., Strieder, C., Rolf, B. N., Limata, L., Gialanella, Imbriani, Gianluca, Roca, Vincenzo, Romano, Mario, N., De Cesare, A., D'Onofrio, D., Rogalla, and F., Terrasi
- Subjects
Systematic error ,Metal ,Physics ,Nuclear and High Energy Physics ,Electron capture ,visual_art ,visual_art.visual_art_medium ,Half-life ,Electron configuration ,Atomic physics ,Experimental Nuclear Physics - Abstract
The electron capture half life of 7 Be implanted into different metals has been measured with high precision in order to search for a possible dependence of the decay rate on the electron configuration around the 7 Be atoms. In order to reduce systematic errors, the half life in different metals is measured by three laboratories simultaneously using different experimental setups. The measurements and data analysis are in progress, preliminary results are presented.
- Published
- 2005
18. The LUNA II accelerator
- Author
-
C. Gustavino, Gianluca Imbriani, D. Schürmann, A. Formicola, R. Bonetti, G. Gervino, C. Casella, H. Costantini, Sandra Zavatarelli, Vincenzo Roca, Paolo Prati, Filippo Terrasi, F. Strieder, C. Rolfs, P. Corvisiero, Carlo Broggini, Daniel Bemmerer, H. P. Trautvetter, M. Junker, Mario R. Romano, A. Lemut, A., Formicola, Imbriani, Gianluca, M., Junker, D., Bemmerer, R., Bonetti, C., Broggini, C., Casella, P., Corvisiero, H., Costantini, G., Gervino, C., Gustavino, A., Lemut, P., Prati, Roca, Vincenzo, C., Rolf, Romano, Mario, D., Schürmann, F., Strieder, F., Terrasi, H. P., Trautvetter, and S., Zavatarelli
- Subjects
Nuclear reaction ,Physics ,Nuclear and High Energy Physics ,Proton ,Carbon-12 ,Resonance ,Isotopes of sodium ,Nuclear physics ,Nuclear astrophysics ,Nuclear Reactions ,Atomic physics ,Experimental nuclear physic ,Experimental Nuclear Astrophysic ,Instrumentation ,Isotopes of magnesium ,Beam (structure) - Abstract
A second high current accelerator of 400 kV has been installed at the underground laboratory of Gran Sasso, called LUNA II. We describe this new facility as well as measurements of the proton beam characteristics: absolute energy, energy spread, and long-term energy stability. The absolute energy was determined to a precision of +/-300 eV at E-p = 130-400 keV using the energy of the capture gamma-ray transition of C-12(p,gamma)N-13 as well as resonance energies at E-p = 309-389 keV of Na-23(p, gamma)Mg-24, Mg-26(p, gamma)Al-27, and Mg-25(p, gamma)Al-26. The resonance studies led to a proton energy spread of better than 100 eV and a long-term energy stability of 5 eV per hour.
- Published
- 2003
19. WEAR MEASUREMENTS BY MEANS OF RADIOACTIVE ION IMPLANTATION
- Author
-
A. Stephan, Hans Werner Becker, D. Daliento, Vincenzo Roca, Gyuri Gyürky, Detlef Rogalla, Gianluca Imbriani, Lucio Gialanella, Zsolt Fülöp, N. Sanseverino, F. Strieder, Antonio D'Onofrio, Filippo Terrasi, Mario R. Romano, Michele Russo, N. De Cesare, E. Somorjai, Daliento, Santolo, Sanseverino, Annunziata, L., Gialanella, Imbriani, Gianluca, Roca, Vincenzo, M., Romano, N., Decesare, A. D., Onofrio, F., Terrasi, H. W., Becker, D., Rogalla, A., Stephan, F., Strieder, Z., Fulop, G., Gyurky, E., Somorjai, Russo, Michele, Gialanella, L., Imbriani, G., Roca, V., Romano, M., De Cesare, N., D'Onofrio, A., Terrasi, F., Becker, H. W., Rogalla, D., Stephan, A., Strieder, F., Fulop, Z., Gyurky, G., Somorjai, E., Russo, M., Daliento, D., Sanseverino, N., N., DE CESARE, A., Donofrio, D., Daiento, and A., Sanseverino
- Subjects
Materials science ,Ion beam ,business.industry ,chemistry.chemical_element ,Focused ion beam ,Ion ,Physics and Astronomy (all) ,Ion implantation ,Ion beam deposition ,chemistry ,Sputtering ,Radiation damage ,Optoelectronics ,Atomic physics ,Beryllium ,business - Abstract
Radioactive ion implantation allows non‐contacting, online wear measurements with sub micrometric sensitivity to be performed, by monitoring the removed and/or residual activity on parts subject to wear. Comparative studies of different materials, including those who exhibit a low resistance to radiation damage, can be easily performed by means of this technique. A project has started at the TTT3 tandem of the University “Federico II” in Naples, Italy, in order to exploit such technique using a 7Be ion beam, that was developed to study the astrophysical important reaction 7Be(p,γ)8B. The 7Be ion beam is produced using a ion sputter source and accelerated to an energy up to 8.0 MeV. A novel setup allows control of the implanted ion depth distribution, and is a crucial point for the application of this technique. The 7Be ion beam production and implantation procedures are discussed. Finally, the results of some test measurements are presented.
- Published
- 2002
20. Stopping power of low-energy deuterons in He-3 gas
- Author
-
Vincenzo Roca, M. Junker, Paolo Prati, Mario R. Romano, Gianluca Imbriani, Detlef Rogalla, Antonio D'Onofrio, H. Costantini, R.W. Kavanagh, C. Gustavino, A. Ordine, Gyuri Gyürky, Zsolt Fülöp, E. Somorjai, R. Bonetti, G. Gervino, Oscar Straniero, P. Corvisiero, Marialuisa Aliotta, A. Formicola, Filippo Terrasi, L. Campajola, A. Guglielmetti, H. P. Trautvetter, Frank Strieder, Lucio Gialanella, Carlo Broggini, F. Raiola, C. Rolfs, Sandra Zavatarelli, F. Schümann, P. G. Prada Moroni, Raiola, F, Gyurky, G, Aliotta, M, Formicola, A, Bonetti, R, Broggini, C, Campajola, L, Corvisiero, P, Costantini, H, D'Onofrio, A, Fulop, Z, Gervino, G, Gialanella, L, Guglielmetti, A, Gustavino, C, Imbriani, Gianluca, Junker, M, Kavanagh, Rw, Moroni, Pgp, Ordine, A, Prati, P, Roca, Vincenzo, Rogalla, D, Rolfs, C, Romano, Mario, Schumann, F, Somorjai, E, Straniero, O, Strieder, F., Terrasi, F, Trautvetter, Hp, and Zavatarelli, S.
- Subjects
Physics ,Experimental Nuclear Physic ,Nuclear and High Energy Physics ,Hadron ,chemistry.chemical_element ,Energy loss and stopping power ,DISSOCIATION ,HYDROGEN ,Charged particle ,Ion ,H2+ IONS ,Nuclear physics ,chemistry ,Deuterium ,Helium-3 ,VELOCITY PROPORTIONALITY ,Nuclear fusion ,Atomic physics ,HELIUM ,Isotopes of helium ,Helium - Abstract
The stopping power of atomic and molecular deuterons in 3 He gas was measured over the range Ed = 10 to 100 keV using the 3 He pressure dependence of the 3 He(d,p) 4 He reactionyield. At en ergies above 30 keV, the observed stopping power values are in good agreement with a standard compilation. However, near 18 keV the experimental values drop by a factor 50 below the extrapolated values of the compilation. In a simple model, the behavior is due to the minimum 1s → 2s electronexcitationof the He target atoms (= 19.8 eV, corresponding to Ed = 18.2 keV), i.e. it is a quantum effect, by which the atoms become nearly transparent for the ions.
- Published
- 2001
21. Electron screening effect in the reactions 3He(d,p)4He and d(3He,p)4He
- Author
-
R. Bonetti, Lucio Gialanella, C. Rolfs, Vincenzo Roca, Paolo Prati, M. Junker, Zs. Fülöp, A. Formicola, Mario R. Romano, A. Ordine, Gy. Gyürky, Gianluca Imbriani, Sandra Zavatarelli, H. P. Trautvetter, H. Costantini, P. Corvisiero, G. Gervino, Oscar Straniero, C. Gustavino, Marialuisa Aliotta, P.G. Moroni, Filippo Terrasi, A. Guglielmetti, E. Somorjai, Detlef Rogalla, Antonio D'Onofrio, Frank Strieder, L. Campajola, F. Schümann, Carlo Broggini, F. Raiola, M., Aliotta, F., Raiola, G., Gyurky, A., Formicola, R., Bonetti, C., Broggini, L., Campajola, P., Corvisiero, H., Costantini, A., D'Onofrio, Z., Fulop, G., Gervino, L., Gialanella, A., Guglielmetti, C., Gustavino, Imbriani, Gianluca, M., Junker, R. W., Kavanagh, P. G., Moroni, A., Ordine, P., Prati, Roca, Vincenzo, D., Rogalla, C., Rolf, Romano, Mario, F., Schumann, E., Somorijai, O., Straniero, F., Strieder, F., Terrasi, H. P. TRAUTVETTER AND S. Z. A. V. A. T. A. R. E. L. L., I., G., Gyürky, Z., Fülöp, F., Schümann, E., Somorjai, H. P., Trautvetter, and S., Zavatarelli
- Subjects
Experimental Nuclear Physic ,Physics ,Nuclear physics ,Nuclear and High Energy Physics ,Electron screening ,Screening effect ,Nuclear Reactions ,Nuclear astrophysics ,Electron ,Atomic physics ,Potential energy ,Dissociation (chemistry) - Abstract
The cross section of the reactions 3He(d, p) 4 He and d(3He, p)4He has been measured at the center-of-mass energies E=5 to 60 keV and 10 to 40 keV, respectively. The experiments were performed to determine the magnitude of the electron screening effect leading to the respective electron-screening potential energy U e =219±7 and 109±9 eV, which are both significantly higher than the respective values from atomic physics models, U e =120 and 65 eV.
- Published
- 2001
22. The D(He-3, p)He-4 fusion reaction: electron screening effect and astrophysical S(E) factor at low energies
- Author
-
C. Rolfs, R. Bonetti, F. Strieder, Antonio D'Onofrio, P. G. Prada Moroni, Gianluca Imbriani, F. Schümann, Sandra Zavatarelli, A. Ordine, H. Costantini, M. Junker, G. Gervino, Filippo Terrasi, Mario R. Romano, Detlef Rogalla, H. P. Trautvetter, L. Campajola, Vincenzo Roca, C. Gustavino, Paolo Prati, P. Corvisiero, A. Formicola, Lucio Gialanella, Carlo Broggini, A. Guglielmetti, S., Zavatarelli, P., Corvisiero, H., Costantini, P. G., Prada Moroni, P., Prati, R., Bonetti, A., Guglielmetti, C., Broggini, L., Campajola, A., Formicola, L., Gialanella, Imbriani, Gianluca, A., Ordine, Roca, Vincenzo, Romano, Mario, A., D'Onofrio, F., Terrasi, G., Gervino, C., Gustavino, M., Junker, D., Rogalla, C., Rolf, F., Schumann, F., Strieder, and H. P., Trautvetter
- Subjects
Nuclear physics ,Physics ,Experimental Nuclear Physic ,Nuclear and High Energy Physics ,Screening effect ,Nuclear Astrophysics ,Nuclear fusion ,Electron ,Atomic physics ,E factor ,Nuclear Astrophysic ,underground laboratory - Abstract
The D(He-3,p)He-4 cross section has been measured at E = 4.2 to 13.8 keV using the LUNA accelerator facility installed in the Gran Sasso National Laboratory (LNGS). The experimental setup and the interpretation of results in terms of electron screening potential are described. In the same experiment an estimate of the observed stopping power of the He-3 ions in D-2 target has been obtained and it turned out to be in good agreement with the standard compilation.
- Published
- 2001
23. Stopping power, electron screening and the astrophysical S(E) factor of d(He-3,p)He-4
- Author
-
L. Gialanella, Carlo Broggini, C. Gustavino, Gianluca Imbriani, Vincenzo Roca, Uwe Greife, A. Guglielmetti, Paolo Prati, A. Formicola, A. Fubini, F. Schumann, C. Rolfs, Detlef Rogalla, P. G. Prada Moroni, G. Gervino, A. Ordine, Oscar Straniero, Filippo Terrasi, Antonio D'Onofrio, Sandra Zavatarelli, Frank Strieder, L. Campajola, R. Bonetti, H. Costantini, P. Corvisiero, M. Junker, Mario R. Romano, H. P. Trautvetter, Costantini, H, Formicola, A, Junker, M, Bonetti, R, Broggini, C, Campajola, L, Corvisiero, P, D'Onofrio, Antonio, Fubini, A, Gervino, G, Gialanella, Lucio, Greife, U, Guglielmetti, A, Gustavino, C, Imbriani, G, Ordine, A, Moroni, Pgp, Prati, P, Roca, V, Rogalla, D, Rolfs, C, Romano, M, Schumann, F, Straniero, O, Strieder, F, Terrasi, Filippo, Trautvetter, Hp, Zavatarelli, S., H., Costantini, A., Formicola, M., Junker, R., Bonetti, C., Broggini, L., Campajola, P., Corvisiero, A., D'Onofrio, A., Fubini, G., Gervino, L., Gialanella, U., Greife, A., Guglielmetti, C., Gustavino, Imbriani, Gianluca, A., Ordine, P. G., Prada Moroni, P., Prati, Roca, Vincenzo, D., Rogalla, C., Rolf, Romano, Mario, F., Schümann, O., Straniero, F., Strieder, F., Terrasi, H. P., Trautvetter, and S., Zavatarelli
- Subjects
Physics ,electron screening ,Nuclear and High Energy Physics ,Screening effect ,Experimental Nuclear physic ,Electron ,E factor ,Potential energy ,Ion ,Nuclear physics ,Cross section (physics) ,stopping power ,Nuclear Astrophysics ,Stopping power (particle radiation) ,Atomic physics ,Data reduction - Abstract
The d( 3 He,p) 4 He cross section has been measured at E =4.2 to 13.8 keV using the LUNA underground accelerator facility. The experiment was performed to determine the magnitude of the atomic screening effect and to establish values for the energy loss used in data reduction. The observed stopping power of the 3 He ions in the D 2 target is in good agreement with the standard compilation. Using these stopping power values the data lead to an electron-screening potential energy U e = 132±9 eV, which is significantly higher than the estimated value of 65 eV from an atomic-physics model.
- Published
- 2000
24. Energy loss of deuterons in He-3 gas: a threshold effect
- Author
-
A. Guglielmetti, F. Schümann, Detlef Rogalla, Vincenzo Roca, Gianluca Imbriani, Paolo Prati, Oscar Straniero, C. Rolfs, Marialuisa Aliotta, Filippo Terrasi, Lucio Gialanella, Sandra Zavatarelli, P. Corvisiero, Gyuri Gyürky, L. Campajola, E. Somorjai, H. Costantini, Antonio D'Onofrio, A. Formicola, R. Bonetti, C. Gustavino, Carlo Broggini, F. Raiola, Frank Strieder, G. Gervino, M. Junker, Mario R. Romano, H. P. Trautvetter, A. Ordine, Zsolt Fülöp, Formicola, A., Aliotta, M., Gyürky, G., Raiola, F., Bonetti, R., Broggini, C., Campajola, L., Corvisiero, P., Costantini, H., D'Onofrio, A., Fülöp, Z., Gervino, G., Gialanella, L., Guglielmetti, A., Gustavino, C., Imbriani, Gianluca, Junker, M., Ordine, A., Prati, P., Roca, Vincenzo, Rogalla, D., Rolfs, C., Romano, Mario, Schümann, F., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., Trautvetter, H. P., Zavatarelli, S., A., Formicola, M., Aliotta, G., Gyurky, F., Raiola, R., Bonetti, C., Broggini, L., Campajola, P., Corvisiero, H., Costantini, A., D'Onofrio, Z., Fulop, G., Gervino, L., Gialanella, A., Guglielmetti, C., Gustavino, M., Junker, A., Ordine, P., Prati, D., Rogalla, C., Rolf, F., Schuemann, E., Somorjai, O., Straniero, F., Strieder, F., Terrasi, H. P., Trautvetter, and AND S., Zavatarelli
- Subjects
Physics ,NUCLEAR ASTROPHYSICS ,Experimental Nuclear Physic ,Nuclear and High Energy Physics ,Drop (liquid) ,Experimental nuclear astrophysics ,chemistry.chemical_element ,Energy loss and stopping power ,CROSS-SECTION ,Quantum Hall effect ,chemistry ,Deuterium ,Electron excitation ,Helium-3 ,Nuclear fusion ,Atomic physics ,Isotopes of helium ,Helium - Abstract
The energy loss of deuterons in 3He gas was measured at E d = 15 to 100 keV using the 3He pressure dependence of the 3He(d,p)4He cross-section at a given incident energy. At the highest energies, the observed energy loss is in good agreement with a standard compilation. However, with decreasing energy the experimental values drop steadily below the theoretical values and near E d = 18 keV they drop sharply (within 1 keV) reaching the domain of nuclear stopping power. This threshold behavior is due to the minimum 1s → 2s electron excitation of the He target atoms, i.e. it is a quantum effect. Some consequences are discussed.
- Published
- 2000
25. Recoil separator ERNA: Ion Beam purification'
- Author
-
C. Rolfs, H. P. Trautvetter, A. Ordine, Gianluca Imbriani, Mario R. Romano, Uwe Greife, L. Campajola, S. Theis, Frank Strieder, Vincenzo Roca, Detlef Rogalla, F. Schümann, Carlo Sabbarese, Filippo Terrasi, Antonio D'Onofrio, L. Gialanella, D., Rogalla, S., Thei, L., Campajola, A., D'Onofrio, L., Gialanella, U., Greife, Imbriani, Gianluca, A., Ordine, Roca, Vincenzo, C., Rolf, Romano, Mario, C., Sabbarese, F., Schumann, F., Strieder, F., Terrasi, H. P., Trautvetter, F., Schümann, Rogalla, D, Theis, S, Campajola, L, D'Onofrio, Antonio, Gialanella, Lucio, Greife, U, Imbriani, G, Ordine, A, Roca, V, Rolfs, C, Romano, M, Sabbarese, Carlo, Schumann, F, Strieder, F, Terrasi, Filippo, and Trautvetter, Hp
- Subjects
Nuclear reaction ,Physics ,Nuclear and High Energy Physics ,Ion beam ,Particle detector ,Semiconductor detector ,Momentum ,Nuclear physics ,Nuclear Astrophysics ,Measuring instrument ,Nuclear astrophysics ,Physics::Accelerator Physics ,Atomic physics ,Experimental nuclear physic ,Instrumentation ,Beam (structure) - Abstract
For improved measurements of the key astrophysical reaction View the MathML source in inverse kinematics, a recoil separator ERNA is developed to detect directly the View the MathML source recoils with nearly 100% efficiency. Since the View the MathML source projectiles and the View the MathML source recoils have essentially the same momentum and since the View the MathML source ion beam emerging from an accelerator usually passes through a momentum filter, a sufficient absence of an View the MathML source beam contaminant in the View the MathML source ion beam is of utmost importance for ERNA. In the present work, a Wien filter together with a ΔE−E telescope are used to investigate the beam contaminants accompanying a momentum-filtered View the MathML source ion beam and to measure the level of ion beam purification achievable with the Wien filter.
- Published
- 1999
Catalog
Books, media, physical & digital resources
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.