A precision measurement of pp elastic scattering cross-sections at intermediate energies

Albers, D.; Bauer, F.; Bisplinghoff, J.; Bollmann, R.; Busch, M.; Daniel, R. R.; Diehl, Oliver; Dohrmann, F.; Ernst, J.; Gasthuber, Martin; Gebel, R.; Greiff, J.; Groß, A.; Groß-Hardt, R.; Heider, S.; Heine, Annkristin; Hinterberger, F.; Igelbrink, M.; Jeske, M.; Langkau, Rudolf; Lindlein, J.; Maier, R.; Maschuw, R.; Mosel, F.; Prasuhn, D.; Rohdjeß, H.; Rosendaal, D.; Rossen, P. von; Scheid, N.; Schirm, N.; Schulz-Rojahn, M.; Schwandt, F.; Schwarz, V.; Scobel, W.; Thomas, S. B.; Weise, E.; Wellinghausen, A.; Woller, K.; Ziegler, Robert

doi:10.1140/epja/i2004-10011-3

Cited by 53 publications

(10 citation statements)

References 61 publications

(68 reference statements)

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“…Reactions that produce lower energy particles, usually a deuteron or a proton, are removed with an absorbing medium between the target and the detector. A similar arrangement was achieved in a previous experiment [7] using the scintillators of the EDDA detector [4,5]. Long scintillators, called ''bars,'' ran parallel to the beam and were read out with photomultiplier tubes mounted on the downstream end.…”

Section: Methodsmentioning

confidence: 98%

“…The value is listed in Eq. (4). From this, it is possible to calculate the slip factor as Other parameters measured separately for cooled and uncooled beams are given in Table II.…”

Section: Accelerator Parametersmentioning

confidence: 99%

“…In addition, there must be methods to reduce and/ or correct systematic polarimeter errors under conditions where the beam-target geometry and instantaneous counting rate are changing. In a recent experiment using the scintillators of the EDDA detector [4,5] located at the cooler synchrotron (COSY) at the Forschungszentrum Jülich [6], a thick carbon target located at the edge of the circulating beam was used to demonstrate efficient operation, high spin sensitivity, and the ability to correct systematic errors at levels below 10 À5 in the polarization measurement [7]. By arranging for a continuous, slow extraction of the beam onto the carbon block, this arrangement provided a means of continuously monitoring the beam polarization during the time that the beam was captured in the storage ring.…”

Section: Introductionmentioning

confidence: 99%

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Synchrotron oscillation effects on an rf-solenoid spin resonance

Benati¹,

Chiladze²,

Dietrich³

et al. 2012

Phys. Rev. ST Accel. Beams

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New measurements are reported for the time dependence of the vertical polarization of a 0:97 GeV=c deuteron beam circulating in a storage ring and perturbed by an rf solenoid. The storage ring is the cooler synchrotron (COSY) located at the Forschungszentrum Jülich. The beam polarization was measured continuously using a 1.5 cm thick carbon target located at the edge of the circulating deuteron beam and the scintillators of the EDDA detector. An rf solenoid mounted on the ring was used to generate fields at and near the frequency of the 1 À G spin resonance. Measurements were made of the vertical beam polarization as a function of time with the operation of the rf solenoid in either fixed or continuously variable frequency mode. Using rf-solenoid strengths as large as 2:66 Â 10 À5 revolutions=turn, slow oscillations ($ 1 Hz) were observed in the vertical beam polarization. When the circulating beam was continuously electron cooled, these oscillations completely reversed the polarization and showed no sign of diminishing in amplitude. But for the uncooled beam, the oscillation amplitude was damped to nearly zero within a few seconds. A simple spin-tracking model without the details of the COSY ring lattice was successful in reproducing these oscillations and demonstrating the sensitivity of the damping to the magnitude of the synchrotron motion of the beam particles. The model demonstrates that the characteristic features of measurements made in the presence of large synchrotron oscillations are distinct from the features of such measurements when made off resonance. These data were collected in preparation for a study of the spin coherence time, a beam property that needs to become long to enable a search for an electric dipole moment using a storage ring.

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Section: Methodsmentioning

confidence: 98%

“…The value is listed in Eq. (4). From this, it is possible to calculate the slip factor as Other parameters measured separately for cooled and uncooled beams are given in Table II.…”

Section: Accelerator Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synchrotron oscillation effects on an rf-solenoid spin resonance

Benati¹,

Chiladze²,

Dietrich³

et al. 2012

Phys. Rev. ST Accel. Beams

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show abstract

“…[66] show that for low energy scattering, dσ N N /dΩ has no strong angular dependence. Therefore we simply use spins |M N N | 2 ≈ 64 |A N N | 2 m 4 N to infer |A N N | 2 as a function of the center-of-mass energy E 2 cm ≈ 4m 2 N + 2m N T lab .…”

Section: Global Fits Of Total Elastic Cross Sectionsmentioning

confidence: 86%

“…Many independent observables are available from the nucleon-nucleon elastic scattering data collected by the EDDA Experiment at the Cooler Synchrotron (COSY) in Jülich [66,67], experiments at the SATURNE II accelerator at Saclay, at the PSI, Ohio University, JINR, TSL in Uppsala, TUNL etc. (see e.g.…”

Section: Energy Loss Rate Using Phase Shifts Datamentioning

confidence: 99%

Supernovae and Weinberg’s Higgs portal dark radiation and dark matter

2017

J. High Energ. Phys.

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The observed burst duration and energies of the neutrinos from Supernova 1987A strongly limit the possibility of any weakly-interacting light particle species being produced in the proto-neutron star (PNS) core and leading to efficient energy loss. We reexamine this constraint on Weinberg's Higgs portal model, in which the dark radiation particles (the Goldstone bosons) and the dark matter candidate (a Majorana fermion) interact with Standard Model (SM) fields solely through the mixing of the SM Higgs boson and a light Higgs boson. In order for the Goldstone bosons to freely stream out of the PNS core region, the Higgs portal coupling has to be about a factor of 4-9 smaller than the current collider bound inferred from the SM Higgs invisible decay width. We find that in the energy loss rate calculations, results obtained by using the one-pion exchange (OPE) approximation and the SP07 global fits for the nucleon-nucleon total elastic cross section differ only by a factor 3. The SN 1987A constraints surpass those set by laboratory experiments or by the energy loss arguments in other astrophysical objects such as the gamma-ray bursts, even with other nuclear uncertainties taken into account. Furthermore, the SN 1987A constraints are comparable to bounds from the latest dark matter direct search for low-mass WIMPs ( 10 GeV.)

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Nuclear Data Sheets for A = 1

Singh

2005

Nuclear Data Sheets

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A precision measurement of pp elastic scattering cross-sections at intermediate energies

Cited by 53 publications

References 61 publications

Synchrotron oscillation effects on an rf-solenoid spin resonance

Synchrotron oscillation effects on an rf-solenoid spin resonance

Supernovae and Weinberg’s Higgs portal dark radiation and dark matter

Nuclear Data Sheets for A = 1

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