New S-factor results from polarized proton capture measurements below 140 keV

Weller, H. R.
July 2000
AIP Conference Proceedings;2000, Vol. 529 Issue 1, p442
Academic Journal
The availability of intense polarized proton and deuteron beams from the new generation of polarized ion-sources, as well as significant improvements in target and detector technologies, has made it possible to make detailed studies of radiative-capture reactions below 80 keV. It will be shown that polarization data provide important information on the relative phases of interfering amplitudes. Knowledge of these phases along with low energy cross section data lead to much more reliable extrapolated values of the Astrophysical S-factors. Reactions which we have studied or are presently studying include: D(p,γ)[sup 3]He, p(d,γ)[sup 3]He, D(d,γ)[sup 4]He, T(p,γ)[sup 4]He, [sup 7]Li(p,γ)[sup 8]Be, [sup 9]Be(p,γ)[sup 10]B, [sup 11]B(p,γ)[sup 12]C, and [sup 14]N(p,γ)[sup 15]O. The extrapolated values of the S-factors which we obtain differ in all cases from previous values by factors which range from 35 down to a factor of 0.67. These S-factors will be presented along with a discussion of the underlying nuclear physics effects which are responsible for these changes. © 2000 American Institute of Physics.


Related Articles

  • Circular Polarization of Starlight. Eritsian, M.A. // Astrophysics;Jul-Sep2004, Vol. 47 Issue 3, p305 

    Of the 7500 stars cited in the Catalog of starlight polarization, those which satisfy the condition Pobs ≤ σρ% and AV ≥ 0m.5 are selected. It is presumed that the selected stars (n=216) have circularly polarized light.

  • Recent results from JLab on nucleon responses. de Jager, Kees // European Physical Journal A -- Hadrons & Nuclei;Feb2004 Supplement 1, Vol. 19, p267 

    Highlights of recent data from Jefferson Lab on the nucleon response to an electro-magnetic probe are presented. Recent technological advances in polarized beams and either polarized targets or nucleon recoil polarimeters have yielded a significant improvement on the precision of the data. An...

  • Electromagnetic form factors of the nucleon. de Jager, Kees // European Physical Journal A -- Hadrons & Nuclei;May2005 Supplement 2, Vol. 24, p17 

    The experimental and theoretical status of elastic electron scattering from the nucleon is reviewed. As a consequence of new experimental facilities and new theoretical insights, this subject is advancing with unprecedented precision.PACS:13.40.Gp Electromagnetic form factors - 29.27.Hj...

  • The transmission Compton polarimeter of the A4 experiment. Weinrich, Christoph // European Physical Journal A -- Hadrons & Nuclei;May2005 Supplement 2, Vol. 24, p129 

    A transmission Compton polarimeter as a simultaneous, relative monitor for the longitudinal polarisation of a stabilised, polarised electron beam (polarisation degree ~ 80 %) has been constructed in a new design. It is located in the vacuum between the target and the beam dump of the A4 parity...

  • Overview of laser systematics. Cates, Jr., Gordon D. // European Physical Journal A -- Hadrons & Nuclei;May2005 Supplement 2, Vol. 24, p109 

    This paper discusses systematic effects in parity experiments that originate from the laser and optics system that are used in a polarized electron source. Covered are both the sources of systematics, as well as strategies for their minimization.PACS:29.25.Bx Electron sources - 29.27.Hj...

  • The Gerasimov-Drell-Hearn sum rule at MAMI. Thomas, A. // European Physical Journal A -- Hadrons & Nuclei;May2006 Supplment, Vol. 28 Issue 1, p161 

    An extended experimental program to investigate the Gerasimov-Drell-Hearn (GDH) sum rule and related partial reaction cross sections on proton and neutron has been carried out by the GDH collaboration at the electron accelerators MAMI (Mainz) and ELSA (Bonn). The GDH sum rule connects the...

  • Structure functions at HERA. Saxon, D.H. // European Physical Journal A -- Hadrons & Nuclei;Mar2007, Vol. 31 Issue 4, p566 

    HERA provides the key facility for the measurement of proton structure functions. Formalism and methods are outlined for the measurement and interpretation of inclusive structure functions, including the use of polarised e ± beams. The measurement of charm, beauty and photon structure...

  • Dynamics of polarization buildup by spin filtering. Buttimore, N. H.; O'Brien, D. S. // European Physical Journal A -- Hadrons & Nuclei;Jan2008, Vol. 35 Issue 1, p47 

    There has been much recent research into polarizing an antiproton beam, instigated by the recent proposal from the PAX (Polarized Antiproton eXperiment) project at GSI Darmstadt. It plans to polarize an antiproton beam by repeated interaction with a polarized internal target in a storage ring....

  • Nucleon resonance decay by the K0Σchannel. Castelijns, R.; Anisovich, A. V.; Bacelar, J. C. S.; Bantes, B.; Bartholomy, O.; Bayadilov, D.; Beloglazov, Y. A.; Crede, V.; Dutz, H.; Ehmanns, A.; Elsner, D.; Essig, K.; Ewald, R.; Fabry, I.; Fornet-Ponse, K.; Fuchs, M.; Funke, C.; Gothe, R.; Gregor, R.; Gridnev, A. B. // European Physical Journal A -- Hadrons & Nuclei;Jan2008, Vol. 35 Issue 1, p39 

    Hyperon production off the proton in the K 0Σ+ channel has been studied at the tagged-photon beam facility at the ELSA electron accelerator in Bonn. This experiment was part of a series of neutral meson production experiments on various targets. For this purpose, the Crystal Barrel and TAPS...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics