Mutually compensative pseudo solutions of primary energy spectra in the knee region

Ter–Antonyan, S.

doi:10.1016/j.astropartphys.2007.06.004

Cited by 8 publications

(12 citation statements)

References 10 publications

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“…2. Even though the iteration unfolding algorithms for primary energy spectra [11,23,24] lead to plausible solutions, the spectral errors of the solutions, as it is shown in [22], are undetermined due to unavoidable inter-compensating pseudo solutions F A (E)+ g A (E) satisfying the condition…”

Section: Inverse Problemmentioning

confidence: 99%

“…for overall uncertainty of response function ∆f (U) made of statistical errors and uncertainties of interaction model [22]. The unfolding of all-particle spectrum F (E) = A F A (E) from Eq.…”

Section: Inverse Problemmentioning

confidence: 99%

“…This approach, the so called parametrized regularization of the inverse problem, was implemented in [25] (U ≡ N e ) for AKENO [26] data, in [27] for MAKET-ANI data (U ≡ (N ch , θ)) and in [12] for GAMMA array data (U ≡ (N ch , N µ , cosθ, s)). The application of this regularization method for GAMMA array data (U ≡ (N ch , N µ , cosθ)) [28] and different primary spectral models are presented in Section IV.…”

Section: Inverse Problemmentioning

confidence: 99%

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Sharp knee phenomenon of primary cosmic ray energy spectrum

Ter–Antonyan¹

2014

Phys. Rev. D

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Primary energy spectral models are tested in the energy range of 1 − 200 PeV using standardized extensive air shower responses from BASJE-MAS, Tibet, GAMMA and KASCADE scintillation shower arrays. Results point towards the two-component origin of observed cosmic ray energy spectra in the knee region (GAPS spectral model) consisting of a pulsar component superimposed upon rigidity-dependent power law diffuse galactic flux. The two-component energy spectral model accounts for both the sharp knee shower spectral phenomenon and observed irregularity of allparticle energy spectrum in the region of 50 − 100 PeV. Alternatively, tested multi-population primary energy spectra predicted by non-linear diffusive shock acceleration (DSA) models describe observed shower spectra in the knee region provided that the cutoff magnetic rigidities of accelerating particles are 6±0.3 PV and 45±2 PV for the first two populations respectively. Both tested spectral models confirm the predominant H − He primary nuclei origin of observed shower spectral knee. The parameters of tested energy spectra are evaluated using solutions of inverse problem on the basis of the corresponding parameterizations of energy spectra for primary H, He, O-like and F elike nuclei, standardized shower size spectral responses in the 550 − 1085 g/cm 2 atmospheric slant depth range and near vertical muon truncated size spectra detected by the GAMMA array.

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Section: Inverse Problemmentioning

confidence: 99%

Section: Inverse Problemmentioning

confidence: 99%

Section: Inverse Problemmentioning

confidence: 99%

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Sharp knee phenomenon of primary cosmic ray energy spectrum

Ter–Antonyan¹

2014

Phys. Rev. D

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“…11) detected by the GAMMA facility using shower core selection criteria θ < 30 0 and r < 50m [8,9]. We did not consider the H, He and O pulsar components to avoid a large number of unknown parameters and corresponding mutually compensative pseudo solutions [34] for the Galactic components.…”

Section: Possible Origin Of Irregularitiesmentioning

confidence: 99%

An all-particle primary energy spectrum in the 3–200 PeV energy range

Garyaka

Мартиросов

Ter–Antonyan

et al. 2008

J. Phys. G: Nucl. Part. Phys.

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We present all-particle primary cosmic-ray energy spectrum in the 3 · 10 6 − 2 · 10 8 GeV energy range obtained by a multi-parametric event-by-event evaluation of the primary energy. The results are obtained on the basis of an expanded EAS data set detected at mountain level (700 g/cm 2 ) by the GAMMA experiment. The energy evaluation method has been developed using the EAS simulation with the SIBYLL interaction model taking into account the response of GAMMA detectors and reconstruction uncertainties of EAS parameters. Nearly unbiased (< 5%) energy estimations regardless of a primary nuclear mass with an accuracy of about 15−10% in the 3 · 10 6 − 2 · 10 8 GeV energy range respectively are attained.An irregularity ('bump') in the spectrum is observed at primary energies of ∼ 7.4 · 10 7 GeV. This bump exceeds a smooth power-law fit to the data by about 4 standard deviations. Not rejecting stochastic nature of the bump completely, we examined the systematic uncertainties of our methods and conclude that they cannot be responsible for the observed feature.

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“…This only shows the difficulty in estimating primary masses from air shower experiments that rests on comparisons of data to EAS simulations with the latter requires hadronic interaction models as input which are still uncertain to a large extent at present. Moreover, the uniqueness of solutions of primary energy spectra in the knee region from EAS data is also questioned [79] . It is expected that the mass composition scenario predicted by the present model will motivate newer experiments, exploiting both e/m and optical techniques, to establish unambiguous cosmic ray mass composition in the knee region and in particular to confirm the KASCADE-Grande results including the Fe-knee.…”

Section: Discussionmentioning

confidence: 99%

Progenitor model of cosmic ray knee

Bijay

Bhadra

2016

Res. Astron. Astrophys.

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Primary energy spectrum of cosmic rays exhibits a knee at about 3 PeV where a change in the spectral index occurs. Despite many efforts the origin of such a feature of the spectrum is not satisfactorily solved yet. Here it is proposed that the steepening of the spectrum beyond the knee may be a consequence of mass distribution of progenitor of cosmic ray source. The proposed speculative model can account all the major observed features about cosmic rays without invoking any fine tuning to match flux or spectra at any energy point. The prediction of the proposed model regarding primary composition scenario beyond the knee is quite different from most of the prevailing models of the knee and thereby can be discriminated from precise experimental measurement of the primary composition.

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Mutually compensative pseudo solutions of primary energy spectra in the knee region

Cited by 8 publications

References 10 publications

Sharp knee phenomenon of primary cosmic ray energy spectrum

Sharp knee phenomenon of primary cosmic ray energy spectrum

An all-particle primary energy spectrum in the 3–200 PeV energy range

Progenitor model of cosmic ray knee

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