scholarly journals Angular asymmetry of the nuclear interaction probability of high energy particles in short bent crystals

2020 ◽  
Vol 80 (1) ◽  
Author(s):  
W. Scandale ◽  
F. Cerutti ◽  
L. S. Esposito ◽  
M. Garattini ◽  
S. Gilardoni ◽  
...  
Keyword(s):  
Silicon Crystal ◽  
Nuclear Interaction ◽  
High Energy ◽  
Planar Channeling ◽  
The North ◽  
Volume Reflection ◽  
Bent Crystals ◽  
First Time ◽  
High Energy Particles ◽  
Hadron Beam

AbstractThe rate of inelastic nuclear interactions in a short bent silicon crystal was precisely measured for the first time using a 180 GeV/c positive hadron beam produced in the North Experimental Area of the CERN SPS. An angular asymmetry dependence on the crystal orientation in the vicinity of the planar channeling minimum has been observed. For the inspected crystal, this probability is about $$\sim 20\%$$∼20% larger than in the amorphous case because of the atomic density increase along the particle trajectories in the angular range of volume reflection, whose dimension is determined by the crystal bending angle. Instead, for the opposite angular orientation with respect to the planar channeling, there is a smaller probability excess of $$\sim 4\%$$∼4%.

scholarly journals Observation of channeling and volume reflection in bent crystals for high-energy negative particles

2009 ◽  
Vol 681 (3) ◽  
pp. 233-236 ◽  
Author(s):  
W. Scandale ◽  
A. Vomiero ◽  
E. Bagli ◽  
S. Baricordi ◽  
P. Dalpiaz ◽  
...  
Keyword(s):  
High Energy ◽  
Volume Reflection ◽  
Bent Crystals

Event deposits in the Eastern Thermaikos Gulf and Kassandra Peninsula (Northern Greece): evidence of the 479 BC "Herodotus tsunami"

2019 ◽  
Vol 62 (2) ◽  
pp. 101-125
Author(s):  
Margret Mathes-Schmidt ◽  
Ioannis Papanikolaou ◽  
Klaus Reicherter ◽  
Aggelos Pallikarakis
Keyword(s):  
High Energy ◽  
Time Span ◽  
The South ◽  
Northern Greece ◽  
Reservoir Effect ◽  
Tsunami Waves ◽  
Vast Amount ◽  
The North ◽  
First Time ◽  
Bivalve Shells

Event deposits of high-energy waves in the Eastern Thermaikos Gulf and Kassandra Peninsula (Northern Greece) are investigated, and evidence for the 479 BC "Herodotus tsunami" is described for the first time. One of the first historical descriptions of tsunami waves and its effects on Persian troops near Potidaea in 479 BC was made by Herodotus. Sedimentary traces of tsunamis were investigated in cores from different areas from Angelochori in the north to the ruins of ancient Mende in the south (Kassandra peninsula). Evidence for one, locally two high-energy events, on the coasts of Chalkidiki is found. These layers are preserved in flat and lagoonal areas at least from 100 m of the present-day beach. Within ancient Mende, a high-energy layer was encountered. Besides a vast amount of ceramics, the layer also contains articulated bivalve shells. These were dated to a time span between 712 and 521 cal yrs BC by radiocarbon including a reservoir effect of 400 ± 40 years. Resulting ages resemble the time the tsunami mentioned by Herodotus in 479 BC. Deposits of a further event affecting the Thermaikos Gulf were dated between the 7 th to 10 th cent. AD.

scholarly journals STUDIES AND APPLICATION OF BENT CRYSTALS FOR BEAM STEERING AT 70 GEV IHEP ACCELERATOR

2010 ◽  
Vol 25 (supp01) ◽  
pp. 86-97
Author(s):  
A.G. AFONIN ◽  
V.T. BARANOV ◽  
G.I. BRITVICH ◽  
V.N. CHEPEGIN ◽  
YU.A. CHESNOKOV ◽  
...  
Keyword(s):  
Beam Steering ◽  
High Energy ◽  
Proton Synchrotron ◽  
Beam Extraction ◽  
Reflection Effect ◽  
Light Ions ◽  
Volume Reflection ◽  
High Energy Collider ◽  
Major Attention ◽  
Bent Crystals

This report overviews studies accomplished in the U70 proton synchrotron of IHEP-Protvino during the recent two decades. Major attention is paid to a routine application of bent crystals for beam extraction from the machine. It has been confirmed experimentally that efficiency of beam extraction with a crystal deflector of around 85% is well feasible for a proton beam with intensity up to 1012 protons per cycle. Another trend is to use bent crystals for halo collimation in a high energy collider. New promising options emerge for, say, LHC and ILC based on the "volume reflection" effect, which has been discovered recently in machine study runs at U70 of IHEP (50 GeV) and SPS of CERN (400 GeV). Perspectives to use bent crystals for extraction of light ions from the U70 accelerator are also disclosed.

FEATURES OF PHOTOCONDUCTIVITY OF Ge AND Si WITH DISORDERED REGIONS

2010 ◽  
Vol 24 (31) ◽  
pp. 2985-2996 ◽  
Author(s):  
V. YEVSEYEV
Keyword(s):  
Large Scale ◽  
High Energy ◽  
Fast Neutrons ◽  
Potential Relief ◽  
Photoelectrical Properties ◽  
Recombination Centers ◽  
First Time ◽  
High Energy Particles ◽  
Disordered Regions

Influence of large radiation defects — disordered regions on photoconductivity of semiconductors Ge and Si , compensated as a result of an irradiation with fast neutrons and 1 GeV protons, is investigated. For the first time, the combined role of disordered regions and a large-scale potential relief in photoelectrical properties of Ge and Si , irradiated by high energy particles is defined. The model of photoconductivity that takes into consideration disordered regions as specific sensitizing recombination centers and allows formation of the spatial potential relief is developed.

Observation of multiple volume reflection by different planes in one bent silicon crystal for high-energy negative particles

2011 ◽  
Vol 93 (5) ◽  
pp. 56002 ◽  
Author(s):  
W. Scandale ◽  
A. Vomiero ◽  
E. Bagli ◽  
S. Baricordi ◽  
P. Dalpiaz ◽  
...  
Keyword(s):  
Silicon Crystal ◽  
High Energy ◽  
Volume Reflection

scholarly journals Reconstruction of past marine submersion events (storms and tsunamis) on the North Atlantic coast of Morocco

2019 ◽  
Author(s):  
Otmane Khalfaoui ◽  
Laurent Dezileau ◽  
Jean-Philippe Degeai ◽  
Maria Snoussi
Keyword(s):  
North Atlantic ◽  
Atlantic Coast ◽  
High Energy ◽  
Economic Losses ◽  
The North ◽  
The North Atlantic ◽  
The One ◽  
Sediment Layers ◽  
First Time ◽  
Common Era

Abstract. The North Atlantic coast of Morocco has been affected historically by marine submersion events resulting from both storms and tsunamis and causing human and economic losses. The development of proactive adaptation strategies requires the study of these events over centennial to millennial timescales. Using a 2.7 m sediment core sampled from the Tahaddart estuary, we have been able to reconstruct past marine submersion events on this coastal area of Morocco over the last 4000 years. The high-resolution sedimentological and geochemical analysis conducted on this core allows us to identify 14 sediment layers attributed to marine high-energy events. The core was dated with isotopic techniques (137Cs, 210Pbex, 14C) and the outcomes reveal that three sediment layers are in connection with two major historical marine submersion events. The first layer mentioned as E1 seems to fit with the great Lisbon tsunami in 1755 CE (Common Era), an event dated for the first time on the Atlantic coast of Morocco. The other two layers referred as E13 and E14 were dated between 3464 and 2837 cal BP and correlated with marine submersion deposits found on Spanish and Moroccan coasts, which confirms the existence of a major high-energy event (around 3200 BP) similar to the one in 1755 CE.

scholarly journals First observation of multiple volume reflection by different planes in one bent silicon crystal for high-energy protons

2009 ◽  
Vol 682 (3) ◽  
pp. 274-277 ◽  
Author(s):  
W. Scandale ◽  
A. Vomiero ◽  
E. Bagli ◽  
S. Baricordi ◽  
P. Dalpiaz ◽  
...  
Keyword(s):  
Silicon Crystal ◽  
High Energy ◽  
Volume Reflection
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