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1.
F. Schümann S. Zavatarelli L. Gialanella U. Greife M. Junker D. Rogalla C. Rolfs F. Strieder H.P. Trautvetter 《The European Physical Journal A - Hadrons and Nuclei》1998,2(4):337-342
Abstact: The elastic scattering cross sections, σ (E,θ), for the systems He+Ta and He+W have been measured at θlab=165° and E
lab=76.1 keV to 3.988 MeV using targets with a thickness of a few atomic layers. The results are smaller than the results given
by the Rutherford scattering law, σR(E,θ), due to the effects of electron screening and can be described by σ(E,θ)/σR(E,θ)=(1+Ue/E)−1, where U
e is an atomic screening potential energy. The deduced average value, U
e=28 ± 3 keV, is consistent with the Moliére- and Lenz-Jensen-models as well as electron binding energies.
Received: 25 May 1998 相似文献
2.
C. Angulo W. H. Schulte D. Zahnow G. Raimann C. Rolfs 《Zeitschrift für Physik A Hadrons and Nuclei》1993,345(3):333-334
The absolute cross section of the fusion reaction
10B(p, 1)7
has been measured at the c.m. energy range E=48 to 159 keV via the 429 keV secondary -ray transition. The studies involved high proton currents and thick solid
10Btargets. The resulting cross sections have the same energy dependence as those of the
10B(p,0)7Bereaction but they are lower by a factor 600.Supported in part by the Deutsche Forschungsgemeinschaft (Ro429/18-2 and Ro429/21-3), the Landesamt Nordrhein Westfalen (IVA5-10600387), and the Comision Intel-ministerial de Ciencia y Technologia (AEN90-0932). 相似文献
3.
L. Buchmann H. W. Becker K. U. Kettner W. E. Kieser P. Schmalbrock C. Rolfs 《Zeitschrift für Physik A Hadrons and Nuclei》1980,296(3):273-280
The reaction26Mg(p, γ)27Al has been investigated atE p (lab)=80–355 keV. The existence of the resonances atE p =292 and 338 keV has been verified and new resonances were found atE p =227 and 275 keV. Information on branching and mixing ratios,ωγ values, total widths, andJ π assignments for the observed resonances is given. Upper limits on theωγ strengths for expected resonances in the energy range covered are presented. The astrophysical aspects of the data are discussed in the light of the26Mg(26Al) isotopic anomaly. 相似文献
4.
Gyürky Gy. Fülöp Zs. Somorjai E. Kiss G. Rolfs C. 《The European Physical Journal A - Hadrons and Nuclei》2004,20(2):355-358
The absolute strengths of the
keV resonance in the
reaction and of the
keV resonance in the
reaction have been measured to
meV and
meV, respectively, in good agreement with previous values. These resonances can be used to measure the absolute acceptance of the recoil separator ERNA to a precision of about 10%.Received: 12 December 2003, Revised: 10 February 2004, Published online: 3 August 2004PACS:
24.30.-v Resonance reactions - 25.40.Lw Radiative capture - 26.20. + f Hydrostatic stellar nucleosynthesis 相似文献
5.
We have studied theD(α, γ)6Li reaction at stellar energies within a potential model. Our calculation improves previous investigations as we explicitely take into account the internal quadrupole moment of the deuteron and ad-state component in the6Li ground state. We reproduce the experimental data for energiesE<3 MeV. We find, however, that our improvements represent only minor corrections. 相似文献
6.
D. Zahnow C. Rolfs S. Schmidt H. P. Trautvetter 《Zeitschrift für Physik A Hadrons and Nuclei》1997,359(2):211-218
Excitation functions and angular distributions of the 9Be(p, α)6Li and 9Be(p, d)8Be reactions have been measured over the energy range E p = 16 to 390 keV. The data are dominated by one broad resonance including interference effects with a direct process. The effects of electron screening have also been observed, which are however significantly larger than expected. The deduced reaction rates at T9 ≤ 1 are in excellent agreement with values given in a compilation. 相似文献
7.
F. Raiola B. Burchard Zs. Fülöp Gy. Gyürky S. Zeng J. Cruz A. Di Leva B. Limata M. Fonseca H. Luis M. Aliotta H. W. Becker C. Broggini A. D'Onofrio L. Gialanella G. Imbriani A. P. Jesus M. Junker J. P. Ribeiro V. Roca C. Rolfs M. Romano E. Somorjai F. Strieder F. Terrasi 《The European Physical Journal A - Hadrons and Nuclei》2006,27(1):79-82
8.
D. Schürmann A. Di Leva L. Gialanella D. Rogalla F. Strieder N. De Cesare A. D'Onofrio G. Imbriani R. Kunz C. Lubritto A. Ordine V. Roca C. Rolfs M. Romano F. Schümann F. Terrasi H. -P. Trautvetter 《The European Physical Journal A - Hadrons and Nuclei》2005,26(2):301-305
The total cross-section of 12C(α,γ)16O was measured for the first time by a direct and ungated detection of the 16O recoils. This measurement in inverse kinematics using the recoil mass separator ERNA in combination with a windowless He
gas target allowed to collect data with high precision in the energy range E = 1.9 to 4.9 MeV. The data represent new information for the determination of the astrophysical S(E) factor. 相似文献
9.
M. Hacke J. Meijer A. Stephan H. H. Bukow M. Höfert C. Rolfs 《Zeitschrift für Physik A Hadrons and Nuclei》1993,346(4):309-318
Mylar foils have been irradiated under typicalPIXE conditions using the Bochum nuclear microprobe. The induced radiation damage was investigated with theHEIS technique for studies of the chemical composition and theSTIM technique for studies of the extent of axial and lateral damage. The data show that the current density of the microbeam influences the extent of axial and lateral damage in the foils, while the fluence of the microbeam causes changes in chemical composition: more than one-half of the originalH andO abundances are lost, while theC abundance — after a 15% drop within the first few seconds — increases slowly with fluence. Furthermore, the thickness of the foil affects the final chemical composition of the sample only at large fluences. The results indicate that some caution is necessary in the interpretation of PIXE analyses of trace elements in biological or medical samples using nuclear microprobes. 相似文献
10.
H. W. Becker K. U. Kettner C. Rolfs H. P. Trautvetter 《Zeitschrift für Physik A Hadrons and Nuclei》1981,303(4):305-312
The reaction12C+12C has been studied in the energy range Ec.m.=2.8–6.3 MeV by charged-particle spectroscopy. Angular distributions of the proton and α-particle exit channels were obtained. The excitation functions do not reveal evidence for the phenomenon of absorption under the barrier. The data have been extrapolated to the energy region of astrophysical interest. The existence of reported and new intermediate resonance structures is discussed. 相似文献