Secondary nucleon flux and dose from the irradiation of a titanium slab shield by 660 MeV protons

1968 ◽  
Vol 24 (1) ◽  
pp. 81-82
Author(s):  
V. A. Kon'shin ◽  
E. S. Matusevich ◽  
V. I. Regushevskii
Keyword(s):  
Secondary Nucleon ◽  
Mev Protons ◽  
Nucleon Flux

Calculated specific yield functions for neutron monitors

1968 ◽  
Vol 46 (10) ◽  
pp. S1048-S1051 ◽  
Author(s):  
K. M. Wainio ◽  
T. H. Colvin ◽  
K. A. More ◽  
O. L. Tiffany
Keyword(s):  
Empirical Data ◽  
Cosmic Ray ◽  
Yield Function ◽  
Specific Yield ◽  
Neutron Monitors ◽  
The Monte Carlo Method ◽  
Yield Functions ◽  
Secondary Nucleon ◽  
Nucleon Flux ◽  
Calculated Flux

Results of calculations to determine specific yield functions for IGY neutron monitors are reported for vertically incident cosmic-ray protons in the range of 1 < Pc < 6 GV. The Monte Carlo method is used to calculate secondary nucleon-flux intensities at atmospheric depths of 312, 680, and 1 000 g/cm2. Experimental data on neutron monitor response are employed to relate the calculated flux data to count rates, and hence to specific yields, at the corresponding depths. Comparison with empirical data for the specific yield function at sea level shows fair agreement for rigidities less than 3 GV, but calculated yields are considerably smaller than the empirical data at higher rigidities. Various possible explanations for the discrepancy are discussed. At this time, the most probable cause appears to be the assumption that vertically incident cosmic rays produce most of the counts registered by neutron monitors.

scholarly journals Unusual enhancement of ~ 30 MeV proton flux in an ICME sheath region

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Mitsuo Oka ◽  
Takahiro Obara ◽  
Nariaki V. Nitta ◽  
Seiji Yashiro ◽  
Daikou Shiota ◽  
...  
Keyword(s):  
Shock Front ◽  
Energetic Particle ◽  
Leading Edge ◽  
Solar Energetic Particle ◽  
Interplanetary Shock ◽  
Proton Event ◽  
Sheath Region ◽  
Time Profiles ◽  
Energetic Particle Flux ◽  
Mev Protons

AbstractIn gradual Solar Energetic Particle (SEP) events, shock waves driven by coronal mass ejections (CMEs) play a major role in accelerating particles, and the energetic particle flux enhances substantially when the shock front passes by the observer. Such enhancements are historically referred to as Energetic Storm Particle (ESP) events, but it remains unclear why ESP time profiles vary significantly from event to event. In some cases, energetic protons are not even clearly associated with shocks. Here, we report an unusual, short-duration proton event detected on 5 June 2011 in the compressed sheath region bounded by an interplanetary shock and the leading edge of the interplanetary CME (or ICME) that was driving the shock. While < 10 MeV protons were detected already at the shock front, the higher-energy (> 30 MeV) protons were detected about four hours after the shock arrival, apparently correlated with a turbulent magnetic cavity embedded in the ICME sheath region.

SPALLATION YIELDS FROM HIGH ENERGY PROTON BOMBARDMENT OF HEAVY ELEMENTS

1957 ◽  
Vol 35 (1) ◽  
pp. 21-37 ◽  
Author(s):  
J. D. Jackson
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Heavy Elements ◽  
Collective Effects ◽  
Comparison With Experiment ◽  
Energy Proton ◽  
Stringent Test ◽  
Neutron Evaporation ◽  
Nuclear Processes ◽  
Mev Protons

The Monte Carlo calculations of McManus and Sharp (unpublished) for the prompt nuclear processes occurring upon bombardment of heavy elements by 400 Mev. protons are combined with a description of the subsequent neutron evaporation to determine spallation cross sections for comparison with experiment. The model employed is a schematic one which suppresses the detailed characteristics of individual nuclei, but gives the over-all behavior to be expected. Many-particle and collective effects such as alpha particle emission and fission are ignored. The computed cross sections are presented in a variety of different graphical forms which illustrate quantitatively the qualitative picture of high energy reactions first given by Serber (1947). The calculations are in general agreement with existing data when fission is not an important effect, but the agreement does not imply a very stringent test of the various features of the model.

scholarly journals Anomalous Beam Transport through Gabor (Plasma) Lens Prototype

2021 ◽  
Vol 11 (10) ◽  
pp. 4357
Author(s):  
Toby Nonnenmacher ◽  
Titus-Stefan Dascalu ◽  
Robert Bingham ◽  
Chung Lim Cheung ◽  
Hin-Tung Lau ◽  
...  
Keyword(s):  
Cost Effective ◽  
Stable Operation ◽  
High Electron ◽  
Beam Transport ◽  
Focusing Effect ◽  
Energy Proton ◽  
Diocotron Instability ◽  
Strong Focusing ◽  
Axis Rotation ◽  
Mev Protons

An electron plasma lens is a cost-effective, compact, strong-focusing element that can ensure efficient capture of low-energy proton and ion beams from laser-driven sources. A Gabor lens prototype was built for high electron density operation at Imperial College London. The parameters of the stable operation regime of the lens and its performance during a beam test with 1.4 MeV protons are reported here. Narrow pencil beams were imaged on a scintillator screen 67 cm downstream of the lens. The lens converted the pencil beams into rings that show position-dependent shape and intensity modulation that are dependent on the settings of the lens. Characterisation of the focusing effect suggests that the plasma column exhibited an off-axis rotation similar to the m=1 diocotron instability. The association of the instability with the cause of the rings was investigated using particle tracking simulations.

Positron emitter depth distribution in PMMA irradiated with 130 MeV protons measured using TOF-PET detectors.

2021 ◽  
pp. 1-1
Author(s):  
Mythra Varun Nemallapudi ◽  
Atiq Rahman ◽  
Augustine Ei-Fong Chen ◽  
Shih-Chang Lee ◽  
Chih-Hsun Lin ◽  
...  
Keyword(s):  
Depth Distribution ◽  
Positron Emitter ◽  
Pet Detectors ◽  
Mev Protons ◽  
Tof Pet

Mechanical Properties of Aluminium after Irradiation by 600 MeV Protons

1989 ◽  
pp. 555-560 ◽  
Author(s):  
F. Paschoud ◽  
R. Gotthardt ◽  
J.-L. Martin ◽  
D. Gavillet ◽  
W.V. Green ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mev Protons

scholarly journals Spallation Products from Cobalt and 240 Mev. Protons

1952 ◽  
Vol 74 (4) ◽  
pp. 1101-1103 ◽  
Author(s):  
Genevieve Wagner ◽  
Edwin O. Wiig
Keyword(s):  
Mev Protons

Experimental benchmarks on kinetic parameters in accelerator-driven system with 100 MeV protons at Kyoto University Critical Assembly

2017 ◽  
Vol 105 ◽  
pp. 346-354 ◽  
Author(s):  
Cheol Ho Pyeon ◽  
Masao Yamanaka ◽  
Tomohiro Endo ◽  
Willem Fredrik G. van Rooijen ◽  
Go Chiba
Keyword(s):  
Kinetic Parameters ◽  
Critical Assembly ◽  
Driven System ◽  
Accelerator Driven System ◽  
Mev Protons
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