Intranuclear Cascade and Fermi-Model Breakup Calculations on the Production of Li, Be, and B isotopes inC12by 156-MeV Protons

1965 ◽  
Vol 14 (12) ◽  
pp. 436-439 ◽  
Author(s):  
E. Gradsztajn ◽  
F. Yiou ◽  
R. Klapisch ◽  
R. Bernas
Keyword(s):  
Fermi Model ◽  
Intranuclear Cascade ◽  
Mev Protons

scholarly journals Yield of deep spallation products of medium to heavy mass targets bombarded with 480 MeV protons

1980 ◽  
Vol 58 (6) ◽  
pp. 891-899 ◽  
Author(s):  
H. Dautet ◽  
G. Bischoff ◽  
J. M. D'Auria ◽  
B. D. Pate
Keyword(s):  
Cross Sections ◽  
Gas Jet ◽  
Evaporation Model ◽  
Intranuclear Cascade ◽  
Medium Mass ◽  
Mev Protons

Absolute cross sections for short-lived alpha emitting, very neutron deficient nucleides resulting from the interaction of 480 MeV protons with several medium mass targets (Ho, Tm, Re, Ta, Au) have been measured at the TRIUMF facility (Vancouver, Canada). Activities were transported using a gas jet system and relative transport efficiencies for products of various Z were measured. Calculations for the production of such deep spallation products were performed using the empirical Silberberg–Tsao method and the more fundamental, intranuclear cascade – evaporation model, and compared against the observed values.

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
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