Lee, C.
Astrophysics
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The cosmic ray proton plus helium energy spectrum measured by the ARGO-YBJ experiment in the energy range 3-300 TeV

The ARGO-YBJ collaboration Bartoli, B. ; Bernardini, P. ; Bi, X. J. ; et al.
Phys.Rev.D 91 (2015) 112017, 2015.
Inspire Record 1355361 DOI 10.17182/hepdata.73337

The ARGO-YBJ experiment is a full-coverage air shower detector located at the Yangbajing Cosmic Ray Observatory (Tibet, People's Republic of China, 4300 m a.s.l.). The high altitude, combined with the full-coverage technique, allows the detection of extensive air showers in a wide energy range and offer the possibility of measuring the cosmic ray proton plus helium spectrum down to the TeV region, where direct balloon/space-borne measurements are available. The detector has been in stable data taking in its full configuration from November 2007 to February 2013. In this paper the measurement of the cosmic ray proton plus helium energy spectrum is presented in the region 3-300 TeV by analyzing the full collected data sample. The resulting spectral index is $\gamma = -2.64 \pm 0.01$. These results demonstrate the possibility of performing an accurate measurement of the spectrum of light elements with a ground based air shower detector.

2 data tables
Table 1

Proton plus helium flux measured at $5.0 \times 10^4$ GeV.

Table 2

Light component energy spectrum measured by the ARGO-YBJ experiment by using the full 2008-2012 data sample in each energy bin.


Anti-proton helium-3 annihilation at 55-MeV/c

Bianconi, A. ; Bonomi, G. ; Bussa, M.P. ; et al.
Phys.Lett.B 492 (2000) 254-258, 2000.
Inspire Record 538722 DOI 10.17182/hepdata.27999

The p̄ 3 He annihilation cross section is measured for the first time in the momentum interval (50÷60) MeV/ c . About 9000 pictures collected by the Streamer Chamber Collaboration (PS179) at LEAR–CERN have been scanned. Six events are found, corresponding to σ ann =1850±700 mb. The result is compared to the set of measurements presently available in the region of low p̄ momentum.

1 data table
Table 1

The mean beam momentum at the center of the fiducial volume = 55 MeV.


A measurement of the Coulomb dissociation of B-8 at 254-MeV/nucleon and the B-8 solar neutrino flux.

Iwasa, N. ; Boue, F. ; Surowka, G. ; et al.
Phys.Rev.Lett. 83 (1999) 2910-2913, 1999.
Inspire Record 507363 DOI 10.17182/hepdata.50399

We have measured the Coulomb dissociation of 8B into 7Be and proton at 254 MeV/nucleon using a large-acceptance focusing spectrometer. The astrophysical S17 factor for the 7Be(p,gamma)8B reaction at E{c.m.} = 0.25-2.78 MeV is deduced yielding S17(0)=20.6 \pm 1.2 (exp.) \pm 1.0 (theo.) eV-b. This result agrees with the presently adopted zero-energy S17 factor obtained in direct-reaction measurements and with the results of other Coulomb-dissociation studies performed at 46.5 and 51.2 MeV/nucleon.

1 data table
Table 1

S17(0) = E * SIG * EXP(CONST(C=ZOMMERFELD PARAMETER)). CONST(C=ZOMMERFELD PARAMETER) = 31.29*Z1*Z2*SQRT(M/E), where Z1 and Z2 are the nuclear charges of the interacting particles, M is the reduced mass, E is the center-of-mass energy. P BE7 reaction is extrapolation to inverse kinematics.