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Digitale Medien

Electron screening in thed+3He fusion reaction (1994)

Prati, P. ; Arpesella, C. ; Bartolucci, F. ; [weitere]

Springer

The European physical journal 350 (1994), S. 171-176

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ISSN: 1434-601X

Schlagwort(e): 25.55.−e

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Cross section measurements of thed(3He,p)4He reaction have been extended to an energy as low asE cm =5.4 keV. The data have an improved accuracy compared with previous work and confirm the existence of electron screening. The combined analysis of the present and previous data leads to an electron screening potential ofU e =123 ± 9 eV. A similar analysis of previous data for3He(d, p)4He leads toU e =186 ± 9 eV. Both screening potentials differ due to the molecular and atomic aggregate state of the targets involved in these investigations and are significantly larger than expected from available atomic physics models, supporting the general trend in studies of electron screening.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01290685

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Digitale Medien

Low-energy cross sections for11B(p, 3α) (1987)

Becker, H. W. ; Rolfs, C. ; Trautvetter, H. P.

Springer

The European physical journal 327 (1987), S. 341-355

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ISSN: 1434-601X

Schlagwort(e): 25.85.−w ; 24.90.+d ; 95.30.−k

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The11B(p, 3α) reaction has been investigated in the energy range fromE c.m.=22 to 1100 keV with the use of either a proton beam and a11B solid target or with the use of a11B heavy ion beam incident on a hydrogen jet gas target. The reaction mechanisms have been studied via kinematically complete coincidence measurements showing that the reaction proceeds predominantly by a sequential decay via8Be. The measurement of absolute cross sections,α-angular distributions and excitation functions is reported. The astrophysicalS(E) factor has been described by means of an empirical fit to the data, leading to a zero-energy intercept ofS(0)=197±12 MeVb. Conclusions drawn on the use of this reaction as an advanced fuel in fusion reactors remain essentially unchanged by the present data.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01284459

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Absolute cross section of the3He(α,γ)7Be reaction (1988)

Hilgemeier, M. ; Becker, H. W. ; Rolfs, C. ; [weitere]

Springer

The European physical journal 329 (1988), S. 243-254

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ISSN: 1434-601X

Schlagwort(e): 25.55.-e ; 27.10 ; 27.20

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The absolute cross section σ(E) of the3He(α, γ)7Be reaction has been measured fromE c.m. =195 to 686 keV. The studies employed both a supersonic jet gas target and an extended gas target, and were carried out by the observation of the prompt capture γ-ray transitions as well as the7Be residual nuclei. The absolute cross sections deduced from the capture γ-rays are in good agreement with most previous work and remove a discrepancy with other earlier work. In comparison, the σ(E) values obtained from the7Be residual nuclei are systematically higher, suggesting a small production of additional7Be by contaminant reactions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01283781

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