Measurements of cosmic-ray secondary nuclei at high energies with the first flight of the CREAM balloon-borne experiment

Abstract

We present new measurements of heavy cosmic-ray nuclei at high energies performed during the first flight of the balloon-borne cosmic-ray experiment CREAM (Cosmic-Ray Energetics And Mass). This instrument uses multiple charge detectors Preprint submitted to Elsevier 12 August 2008and a transition radiation detector to provide the first high accuracy measurements of the relative abundances of elements from boron to oxygen up to energies around 1 TeV/n. The data agree with previous measurements at lower energies and show a relatively steep decline (∼ E −0.6 to E −0.5 ) at high energies. They further show the source abundance of nitrogen relative to oxygen is ∼ 10% in the TeV/n region.

Cosmic ray anomalies from the MSSM?

“…Although there are many measurements of B/C spectra at various energies (see e.g., the list presented in [76]), we choose to fit only the data sets from the CREAM [77], HEAO-3 [78] and ATIC experiments [79]. These sets are the most recent, cover the largest range of energies and have the smallest quoted errors.…”

“…Also shown is the B/C spectrum for the benchmark model (red curve). Data shown are from the CREAM [77], HEAO-3 [78] and ATIC experiments [79]. Figure 6:p/p spectra for all 524 astrophysical models with no SUSY contributions (grey curves).…”

Pulsar interpretation of lepton spectra measured by AMS-02

“…SNRs for SNe type II. To ensure that the propagation parameters are correct, we need to compare the model prediction with the boron-to-carbon ratio [5,[64][65][66] and the proton flux [62]. As shown in Fig.…”

Constraining the Higgs portal with antiprotons

“…In the next four columns of the table we collect the values of halo height z t , slope of the diffusion coefficient δ, spectral index γ, and gradient of the convective velocity dv c /dz; these values are kept fixed, and define -for each propagation models -the corresponding properties of the diffusion-loss equation (3.1). The normalization of the diffusion coefficient D 0 , the low-energy parameter η and the Alfvén velocity v A are obtained via a χ 2 fit of the B/C data from the HEAO3 [41], CREAM [44], ATIC [45] and CRN [46] experiments; in addition, we show the corresponding minimum χ 2 B/C (divided by the number of degrees of freedom). Using the propagation models so defined, we compute the background contribution to thep/p flux, and we fit the solar modulation potential Φ against data from the BESS, CAPRICE and PAMELA experiments.…”

“…(3.1). The B/C data employed in our analysis come from the HEAO3 [41], ACE [42,43],CREAM [44] ATIC [45] and CRN [46] experiments. In table 1, we complete the definition of the five benchmark propagation models by minimizing the χ 2 against B/C data; in this way we obtain, as output of the fitting procedure, D 0 , η and the Alfvén velocity v A .…”