STATUS OF STRANGENESS ELECTRO-PRODUCTION AT MAMI

2010 ◽  
Vol 19 (12) ◽  
pp. 2624-2631
Author(s):  
◽  
P. Achenbach ◽  
P. Achenbach ◽  
C. Ayerbe Gayoso ◽  
J. C. Bernauer ◽  
...  
Keyword(s):  
Electron Beam ◽  
Primary Electron ◽  
High Rate ◽  
Liquid Hydrogen Target ◽  
Kaon Production ◽  
Hydrogen Target ◽  
Zero Degree ◽  
Successful Measurement ◽  
Under Construction ◽  
Compact Design

At the Institut für Kernphysik in Mainz, Germany, the microtron MAMI has been upgraded to 1.5 GeV electron beam energy and can now be used to study strange hadronic systems. The magnetic spectrometer KAOS from GSI was dismantled and re-installed in the spectrometer facility operated by the A1 collaboration. The spectrometer's primary purpose is to study strangeness electro-production. Its compact design and its capability to detect negative and positive charged particles simultaneously under forward scattering angles complements the existing spectrometers. In 2008, an important milestone has been reached by the successful measurement of kaon production off a liquid hydrogen target. The identification of Λ and Σ0 hyperons in the missing mass spectra has demonstrated the capability of the extended facility to perform strangeness electro-production spectroscopy. To operate KAOS as a double-arm spectrometer under zero degree scattering angle major modifications are needed. A new vacuum chamber was constructed and installed, a new coordinate detector with many thousands of channels was built and tested, a new trigger system for the high rate environment was developed, and a magnetic chicane for the primary electron beam is under construction.

scholarly journals Probing the nuclear structure in the vicinity of 78Ni

2019 ◽  
Vol 223 ◽  
pp. 01054
Author(s):  
E. Sahin ◽  
K. Hadynska-Kle¸k ◽  
F.L. Bello Garrote ◽  
A. Görgen
Keyword(s):  
Nuclear Structure ◽  
Experimental Studies ◽  
General Concept ◽  
Magic Numbers ◽  
Liquid Hydrogen Target ◽  
Present Contribution ◽  
Hydrogen Target ◽  
Zero Degree ◽  
Knockout Reactions ◽  
Proton Knockout

Theoretical and experimental studies of neutron-rich nuclei have shown that the general concept of shell structure is not as robust and universal as earlier thought, but can exhibit significant changes as a function of neutron excess. New magic numbers appear and some other conventional ones disappear mainly because of a different ordering of the single-particle orbitals. In the present contribution, recent experimental studies of neutron-rich Cu isotopes, performed at RIKEN using β decay and one-proton knockout reactions, will be discussed. Neutron-rich nuclei near 78Ni were populated through in-flight fission of 238U on thick 9Be targets in both experiments. In the β-decay study, 75,77Ni nuclei were implanted into the WAS3ABi silicon array, while γ rays from excited states in 75,77Cu emitted after β decay of the implanted ions were detected with the EURICA Ge detector array that was surrounding the active stopper. In a second experiment within the SEASTAR campaign at RIKEN, the same 75,77Cu nuclei were produced in (p,2p) knockout reactions from 76,78Zn beam particles at around 250 MeV/nucleon impinging onto the MINOS liquid hydrogen target. In the latter experiment the DALI2 NaI array was used to detect de-excitation γ rays measured in coincidence with Cu nuclei identified in the Zero Degree Spectrometer. Both studies are complimentary and greatly contribute to our understanding on the nuclear structure in the 78Ni region.

scholarly journals KY electroproduction at CLAS12

2020 ◽  
Vol 241 ◽  
pp. 01011
Author(s):  
Lucilla Lanza
Keyword(s):  
Electron Beam ◽  
Cross Section ◽  
Simulated Data ◽  
Thomas Jefferson ◽  
Experimental Program ◽  
Event Generator ◽  
Liquid Hydrogen Target ◽  
Accelerator Facility ◽  
Hydrogen Target ◽  
Forward Detector

An experimental program has been approved at the Thomas Jefferson National Accelerator Facility to measure the (ep,e’K+)Y reactions using the CLAS12 setup in Hall B. Data have been obtained using a 7.5 GeV electron beam, impinging upon a liquid hydrogen target in the CLAS12 center. Scattered electrons have been detected in an angle range of 2.5° to 4.5° by the Forward Tagger (FT) and at angles greater than 5° in the CLAS12 Forward Detector, allowing to measure the KY electroproduction differential cross section and to probe the Q2 evolution of the N* resonances electrocouplings in the Q2 range from 0.05 GeV2 to 3 GeV2. The study of the Q2 dependence of the electrocouplings will provide a crucial tool to investigate the possible hybrid nature of the N* resonances. Preliminary results from CLAS12 data are compared with simulated data using a realistic Gent Regge plus resonance event generator

scholarly journals A Liquid Hydrogen Target for Slac's 30 mA Electron Beam

1969 ◽  
Vol 16 (3) ◽  
pp. 631-632 ◽  
Author(s):  
R. Bell ◽  
H. Clay ◽  
J. Mark ◽  
W. Pierce
Keyword(s):  
Electron Beam ◽  
Liquid Hydrogen ◽  
Liquid Hydrogen Target ◽  
Hydrogen Target

MINOS: A vertex tracker coupled to a thick liquid-hydrogen target for in-beam spectroscopy of exotic nuclei

2014 ◽  
Vol 50 (1) ◽  
Author(s):  
A. Obertelli ◽  
A. Delbart ◽  
S. Anvar ◽  
L. Audirac ◽  
G. Authelet ◽  
...  
Keyword(s):  
Liquid Hydrogen ◽  
Exotic Nuclei ◽  
Liquid Hydrogen Target ◽  
Hydrogen Target

Safety Design, Operation, and Control of a Liquid Hydrogen Target at BNL

1998 ◽  
pp. 629-636
Author(s):  
L. X. Jia ◽  
L. Addessi ◽  
V. Castillo ◽  
L. H. Gong ◽  
J. Leskowicz ◽  
...  
Keyword(s):  
Liquid Hydrogen ◽  
Liquid Hydrogen Target ◽  
Hydrogen Target ◽  
Safety Design ◽  
And Control

scholarly journals Surface excitations in the modelling of electron transport for electron-beam-induced deposition experiments

2015 ◽  
Vol 6 ◽  
pp. 1260-1267 ◽  
Author(s):  
Francesc Salvat-Pujol ◽  
Roser Valentí ◽  
Wolfgang S Werner
Keyword(s):  
Electron Beam ◽  
Electron Transport ◽  
Primary Energy ◽  
Primary Electron ◽  
Sizeable Fraction ◽  
The Subject ◽  
Electron Beam Induced Deposition ◽  
The One ◽  
Electron Energy Loss ◽  
General Perspective

The aim of the present overview article is to raise awareness of an essential aspect that is usually not accounted for in the modelling of electron transport for focused-electron-beam-induced deposition (FEBID) of nanostructures: Surface excitations are on the one hand responsible for a sizeable fraction of the intensity in reflection-electron-energy-loss spectra for primary electron energies of up to a few kiloelectronvolts and, on the other hand, they play a key role in the emission of secondary electrons from solids, regardless of the primary energy. In this overview work we present a general perspective of recent works on the subject of surface excitations and on low-energy electron transport, highlighting the most relevant aspects for the modelling of electron transport in FEBID simulations.

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