Measurements of Proton-Proton and Proton-Iron Inelastic Cross Sections Using Charged Cosmic Ray Hadrons of Energy Greater Than 70c2v PDF Download
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Author: Gordon Dean DeMeester
Publisher:
ISBN:
Category :
Languages : en
Pages : 170
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Book Description
Author: Gordon Dean DeMeester
Publisher:
ISBN:
Category :
Languages : en
Pages : 170
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Book Description
Author: Gordon Dean DeMeester
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Category : Inelastic cross sections
Languages : en
Pages : 161
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Author: Steve R. Blattnig
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Category : Particles (Nuclear physics)
Languages : en
Pages : 88
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Author: James Russell MacFall
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Category : Cosmic rays
Languages : en
Pages : 562
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Author: Albert Laighton Osterheld
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Category :
Languages : en
Pages : 264
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Author: BILLY WEI-YU LOO
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Category :
Languages : en
Pages : 201
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Author:
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Category :
Languages : en
Pages : 4
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The production cross sections of 10Be and 26Al were measured by accelerator mass spectrometry using 89Y, 159Tb, and natCu targets bombarded by protons with energies Ep of 120 GeV and 392 MeV. The production cross sections obtained for 10Be and 26Al were compared with those previously reported using Ep = 50 MeV-24 GeV and various targets. It was found that the production cross sections of 10Be monotonically increased with increasing target mass number when the proton energy was greater than a few GeV. On the other hand, it was also found that the production cross sections of 10Be decreased as the target mass number increased from that of carbon to those near the mass numbers of nickel and zinc when the proton energy was below approximately 1 GeV. They also increased as the target mass number increased from near those of nickel and zinc to that of bismuth, in the same proton energy range. Similar results were observed in the production cross sections of 26Al, though the absolute values were quite different between 10Be and 26Al. As a result, the difference between these production cross sections may depend on the impact parameter (nuclear radius) and/or the target nucleus stiffness.
Author: David Gene Seely
Publisher:
ISBN:
Category :
Languages : en
Pages : 124
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Author:
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Category :
Languages : en
Pages : 16
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Cosmic rays penetrate the lunar surface and interact with the lunar rocks to produce both radionuclides and stable nuclides. Production depth profiles for long-lived radionuclides produce in lunar rocks are measured using Accelerator Mass Spectrometry (AMS). For a particular radionuclide these production depth profiles can be interpreted to give an estimate for the solar proton flux over a time period characterized by the half life of the radionuclide under study. This analysis is possible if and only if all the cross sections for the interactions of all cosmic ray particles with all elements found in lunar rocks are well known. In practice, the most important cross sections needed are the proton production cross sections, because 98% of solar cosmic rays and (approximately)87% of galactic cosmic rays are protons. The cross sections for the production of long-lived radionuclides were very difficult to measure before the development of AMS and only in recent years has significant progress been made in determining these essential cross sections. Oxygen and silicon are major constituents of lunar rocks. We have reported already 14C production cross sections from O and Si for proton energies 25-500 MeV, and O(p, x)1°Be from 58 160 MeV[6]. Here we present new measurements for the cross sections O(p, x)1°Be, O(p, x)7Be, Si(p, x)7Be, Si(p, x)26Al, and Si(p, x)22Na from (approximately)30 - 500 MeV.
Author:
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Category :
Languages : en
Pages : 62
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Measurements of the differential and double-differential Drell-Yan cross sections are presented using an integrated luminosity of 4.5(4.8) inverse femtobarns in the dimuon (dielectron) channel of proton-proton collision data recorded with the CMS detector at the LHC at sqrt{s} = 7 TeV. The measured inclusive cross section in the Z-peak region (60-120 GeV) is \sigma(\ell \ell) = 986.4 +/- 0.6 (stat.) +/- 5.9 (exp. syst.) +/- 21.7 (th. syst.) +/- 21.7 (lum.) pb for the combination of the dimuon and dielectron channels. Differential cross sections $d\sigma/dm$ for the dimuon, dielectron, and combined channels are measured in the mass range 15 to 1500 GeV and corrected to the full phase space. Results are also presented for the measurement of the double-differential cross section d2̂\sigma/dm d.
