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  • 1980-1984  (10)
  • 1975-1979  (3)
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Experimental Nuclear Astrophysics (1978)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 28 (1978), S. 115-159 
    Details
    ISSN: 0066-4243
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.ns.28.120178.000555
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  • 2
    Digitale Medien
    Digitale Medien
    Cultured cells of Arachis hypogaea susceptible to induction of stilbene synthase (resveratrol-forming) (1981)
    Springer
    Plant cell reports 1 (1981), S. 83-85 
    Details
    ISSN: 1432-203X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Callus cultures were established from cotyledons of Arachis hypogaea. The cultured cells were shown to produce stilbene synthase (resveratrol-forming) if the cells were irradiated with 254 nm UV light. The lag period after which the stilbene synthase activity appeared was similar for cultured cells and intact cotyledons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00269281
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  • 3
    Digitale Medien
    Digitale Medien
    The3He(α,γ)7Be reaction and the solar neutrino problem (1982)
    Springer
    The European physical journal 304 (1982), S. 307-332 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The capture reaction3He(α,γ)7Be has been investigated in the energy range ofE c.m. =107 to 1,266 keV. The4He or3He beams of up to 300 μA particle current were incident on3He or4He gas targets, respectively. The gas target systems were all of the windowless and recirculating type. Excitation functions have been obtained with the use of an extended-static gas target, while the measurements ofγ-ray angular distributions involved a quasi-point supersonic jet system. The determination of absolute cross sections has been carried out with both types of gas target systems. Theγ-ray yields in the3He(α,γ)7Be reaction were detected using 80 cm3 Ge(Li) detectors. The data lead to a zero-energy intercept of the astrophysicalS(E) factor ofS(0)=0.30±0.03 keV-b. This result reduces the calculated solar neutrino rate by a factor of 1.76.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01421513
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  • 4
    Digitale Medien
    Digitale Medien
    The15N(p,α 0)12C reaction at stellar energies (1982)
    Springer
    The European physical journal 305 (1982), S. 325-333 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The15N(ρ, α0)12C reaction has been investigated in the energy range ofE p (lab)=78-810keV. The measurement of the excitation functions and α-particle angular distributions involved solid targets as well as a quasi-point supersonic jet gas target. The determination of absolute cross sections has been carried out with the gas target. The observed energy dependence of the total cross sections can be described in terms of two-level Breit-Wigner shapes including the resonances atE p (J π)=335(1−) and 1,028(1−)keV. The data lead to a zero-energy intercept of the astrophysicalS(E) factor ofS(0)= 65±4MeV-b. The angular distributions are asymmetric around 90° and require an additional amplitude in the reaction mechanism, which interferes predominantly with the 335 keV resonance. The origin of this background amplitude is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01419081
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  • 5
    Digitale Medien
    Digitale Medien
    Resonance strengths of some light nuclei (1982)
    Springer
    The European physical journal 305 (1982), S. 319-323 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The strengths of theE c.m.=324 and 829 keV resonances in19F(ρ, αγ)16O have been determined relative to the Rutherford elastic scattering cross section. With these values as standards, the strengths of theE c.m.=259, {pp143} (also 1,106) and 1,259 keV resonances in14N(ρ, γ)15 O,18O(ρp, γy)19F and14N(α, γ)18F were measured, respectively. In addition, the cross section of the direct capture process in16O(ρ, γ)17F atE c.m.=853 keV has been obtained. All measurements were carried out by interchanging the role of projectiles and target nuclei, i.e.14N,16O,18O and19F ion beams of appropriate energies were guided into windowless gas target systems filled with hydrogen or helium gas. The results are compared with previous work.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01419080
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  • 6
    Digitale Medien
    Digitale Medien
    The12C+12C reaction at subcoulomb energies (II) (1981)
    Springer
    The European physical journal 303 (1981), S. 305-312 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01421528
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  • 7
    Digitale Medien
    Digitale Medien
    The4He(12C, γ)16O reaction at stellar energies (1982)
    Springer
    The European physical journal 308 (1982), S. 73-94 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The capture reaction4He(12C, γ)16O (E c.m.= 1.34–3.38 MeV) as well as the elastic scattering process4He(12C,12C)4He (E c.m.=1.44–3.38 MeV) have been investigated with the use of an intense12C beam and a windowless and4He recirculating gas target system. The measurements involved two large NaI(T1) crystals in close geometry to an extended gas target, whereby angle-integrated γ-ray yields were obtained. A large area plastic detector was used for the suppression of time-independent background. A search for cascade γ-ray transitions was carried out by coincidence techniques. The measurement of absolute cross sections is also reported. Theoretical fits of the excitation function for the groundstate γ-ray transition requireE1 as well asE2 capture amplitudes, which are of equal importance at stellar energies. This result increases significantly the stellar burning rate of4He(12C, γ)16O and leads to16O as the dominant product at the end of helium burning in massive stars. The observed capture yield to the 6.92 MeV state is dominated by the direct capture mechanism and plays a small role at stellar energies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415851
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  • 8
    Digitale Medien
    Digitale Medien
    Search for low-energy resonances in25Mg(p,γ)26Al (1979)
    Springer
    The European physical journal 293 (1979), S. 261-268 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The reaction25Mg(p,γ)26Al has been investigated atE p (lab)=80-350keV. The existence of the resonance atE p =317keV has been verified and new resonances have been found atE p =198, 255 and 304 keV. TheE p = 304keV resonance represents a new compound state in26A1. Information on branching ratios,Ωγ values, total widths andJ π assignments for the observed resonances as well as upper limits on themy strengths for the expected resonances atE p =97 and 134 keV are given. The astrophysical aspects of the data are discussed in the light of the renewed interest in the precise location of26A1 nucleosynthesis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01435595
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  • 9
    Digitale Medien
    Digitale Medien
    Stellar reaction rate of26Mg(p, γ)27Al (1980)
    Springer
    The European physical journal 296 (1980), S. 273-280 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415841
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  • 10
    Digitale Medien
    Digitale Medien
    Comparison of the fusion reactions12C+20Ne and16O+16O near the Coulomb barrier (1980)
    Springer
    The European physical journal 297 (1980), S. 161-183 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The partial cross sections of heavy residual nuclei produced in the heavy ion fusion of12C+20Ne have been measured atE c.m.=6–15 MeV viaγ-ray spectroscopy with a Ge(Li) detector. Windowless and recirculating gas target systems have been used. The dominant residual nuclei are24Mg,27Al,28Si,30Si,30P and31P, which arise from two- and three-body breakups in the exit channels. The observed excitation functions are smooth in their energy dependence and give no indications for the existence of pronounced resonance structures, in contrast to theoretical predictions. The Coulomb excitation of20Ne served as an intrinsic calibration standard in the determination of absolute partial and total fusion cross sections. The same experimental set-up was also used in the reaction studies of16O+16O atE c.m.=7–14 MeV, going through the same compound nucleus32S at similar excitation energies. The observed energy dependence in the excitation functions is in good agreement with previous work. The total fusion cross section agrees fairly well with two sets of values reported previously, but deviates significantly from other reported absolute cross section values. The relative evaporation distributions of the residual nuclei are similar for both heavy ion reactions. However, the ratio of their total fusion cross sections deviates from model predictions and suggests that compound nucleus formation does depend on the microscopic structure of the colliding nuclei in the entrance channel. From the observed energy dependence of the above ratio, particularly at subcoulomb energies, geometrical effects in the entrance channel (due to deformed and spherical nuclei) appear to be weak. The astrophysical aspects of the data in the context of late stellar nucleosynthesis are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01421473
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