TITLE

# First measurement of the hydrogen spin-exchange collision cross-section in the low temperature region

AUTHOR(S)
Baumgarten, C.; Braun, B.; Capiluppi, M.; Ciullo, G.; Dalpiaz, P. F.; Kolster, H.; Lenisa, P.; Marukyan, H.; Nass, A.; Reggiani, D.; Stancari, M.; Steffens, E.
PUB. DATE
December 2008
SOURCE
European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Dec2008, Vol. 48 Issue 3, p343
SOURCE TYPE
DOC. TYPE
Article
ABSTRACT
The spin-exchange collision cross-section for hydrogen atoms has been measured for the first time in the low temperature range 40â€“100 K by using the polarized hydrogen gas target of the HERMES experiment at DESY (Hamburg, Germany). The results agree with a previous measurement in the overlapping temperature region 80â€“100 K, while seem to hint an increasing behaviour with temperature in the region 50â€“80 K.
ACCESSION #
32960060

## Related Articles

• Study of X-ray Harmonics of the Polarized Inverse Compton Scattering Experiment at UCLA. Doyuran, A.; England, J.; Joshi, C.; Musumeci, P.; Rosenzweig, J.; Tochitsky, S.; Travish, G.; Williams, O. // AIP Conference Proceedings;2004, Vol. 737 Issue 1, p750

We propose an Inverse Compton Scattering (ICS) experiment, which will investigate nonlinear properties of the scattering utilizing the terawatt CO2 laser system with various polarizations in Neptune Laboratory at UCLA. When the normalized amplitude of the vector potential a0 is larger than unity...

• Parity Violation in ep scattering at JLab. Souder, P. A.; Smith, W. H.; Dasu, S. R. // AIP Conference Proceedings;2005, Vol. 792 Issue 1, p357

We review the program of parity violation in the scattering of polarized electrons at JLab. Results are presented from recent experiments measuring the weak form factors, which in turn measure the contribution of strange quarks to the elastic form factors. In addition, we discuss the physics of...

• Spin physics and more with HERMES. Seitz, B. // European Physical Journal A -- Hadrons & Nuclei;Jul2003, Vol. 17 Issue 3, p369

A review of recent results obtained by the HERMES experiment is given. Inclusive measurements on polarized and unpolarized targets provide precise information on the polarized structure functions g1d and g1p and the isoscalar unpolarized structure function ratio F2A/F2d. The geometrical...

• How well do we know the electromagnetic form factors of the proton? Arrington, J. // European Physical Journal A -- Hadrons & Nuclei;Jul2003, Vol. 17 Issue 3, p311

Recent measurements of recoil polarization in elastic scattering have been used to extract the ratio of the electric to the magnetic proton form factors. These results disagree with Rosenbluth extractions from cross-section measurements, indicating either an inconsistency between the two...

• Ab Initio Calculation of Effective Sherman Functions in MeV Mott Scattering. Aulenbacher, K.; Tioukine, V. // AIP Conference Proceedings;8/4/2009, Vol. 1149 Issue 1, p1155

A Mott polarimeter operating at energies from 1 to 3.5 MeV and at backward scattering angle of 164 degree has been installed at the MAMI accelerator. Its detection system is based on magnetic spectrometers allowing for efficient background suppression. The useful range of primary currents is...

• On extracting information about hadron-nuclear interaction from hadronic atom level shifts. Révai, J.; Shevchenko, N. V. // Few-Body Systems;Dec2008, Vol. 44 Issue 1-4, p225

It is argued that adjusting strong potentials directly to observed hadronic atom level shifts may lead to significantly different scattering lengths than those predicted by the Deser formula [1]. The idea is demonstrated on the case of the 1 s level shift of kaonic hydrogen.

• Experiments on Cross-Polarization Scattering in the Upper Hybrid Resonance Region. Gurchenko, A. D.; Gusakov, E. Z.; Larionov, M. M.; Novik, K. M.; Selenin, V. L.; Stepanov, A. Yu. // Plasma Physics Reports;Jun2005, Vol. 31 Issue 6, p476

In experiments on the FT-1 tokamak, the effect is observed of the cross-polarization scattering of microwave radiation by low-frequency plasma microturbulence in the upper hybrid resonance region. The radar diagnostics based on this effect was used to measure the frequencies and wavenumbers of...

• A new approach to parton-density evolution. Goshtasbpour, Mehrdad; Ratcliffe, Philip G. // AIP Conference Proceedings;2001, Vol. 570 Issue 1, p879

Polarized p-p collisions at RHIC with 50<âˆšs<500 GeV will provide us new information on the spin structure of the nucleon. Using the PHENIX detector, we plan to measure the double-longitudinal spin asymmetry (A[sub LL]) for the heavy-flavor production which is sensitive to the gluon...

• Resolved photon and multicomponent model for $\gamma^* p$ and $\gamma^* \gamma^*$ scattering at high energies. Pietrycki, T.; Szczurek, A. // European Physical Journal C -- Particles & Fields;Sep2005, Vol. 44 Issue 1, p103

We generalize our previous model for $\gamma^* p$ scattering to $\gamma \gamma$ scattering. In the latter case the number of components naturally grows. When using the model parameters from our previous $\gamma^* p$ analysis the model cross section for $\gamma \gamma$ scattering is larger than...

Share