45 citations · 140 across the 32 of their papers we have counts for
34 papers
First measurement of polarized spin-density matrix elements and differential cross sections d/d in ~photoproduction off the proton for GeV using CLAS at Jefferson Lab
T. Hu, Z. Akbar, V. Crede +147
We report on the differential cross sections d/d, the unpolarized spin-density matrix elements , , Re\,, and the first extraction of the polari…
Optimizing Antihydrogen Production via Slow Plasma Merging
E D Hunter, M Bumbar, C Amsler +29
We measure the time-dependent temperature and density distribution of antiprotons and positrons while slowly combining them to make antihydrogen atoms in a nested Penning-Malmberg…
Measured Properties of an Antihydrogen Beam
E. D. Hunter, M. Bumbar, C. Amsler +29
We report a factor of increase in the antihydrogen beam intensity downstream of ASACUSA's Cusp trap: atoms detected per -minute run. The beam contains many Rydberg…
Towards a Study of Low Energy Antiproton Annihilations on Nuclei
Viktoria Kraxberger, Marcus Bumbar, Angela Gligorova +30
A study of antiproton annihilations at rest on thin solid targets is underway at the ASACUSA facility, which now features a dedicated beam line for slow extraction at 250 eV. The e…
Measurement of the nucleon spin structure functions for 0.01<<1 GeV using CLAS
A. Deur, S. E. Kuhn, M. Ripani +147
The spin structure functions of the proton and the deuteron were measured during the EG4 experiment at Jefferson Lab in 2006. Data were collected for longitudinally polarized elect…
Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations
Claude Amsler, Horst Breuker, Marcus Bumbar +33
The mechanism of antiproton-nucleus annihilation at rest is not fully understood, despite substantial previous experimental and theoretical work. In this study we used slow extract…
First Measurement of Deeply Virtual Compton Scattering on the Neutron with Detection of the Active Neutron
CLAS Collaboration, A. Hobart, S. Niccolai +146
Measuring Deeply Virtual Compton Scattering on the neutron is one of the necessary steps to understand the structure of the nucleon in terms of Generalized Parton Distributions (GP…
Dihadron Azimuthal Correlations in Deep-Inelastic Scattering Off Nuclear Targets
CLAS Collaboration
We measured the nuclear dependence of the di-pion azimuthal correlation function in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) and a 5 GeV…
Injection and capture of antiprotons in a Penning-Malmberg trap using a drift tube accelerator and degrader foil
C. Amsler, H. Breuker, M. Bumbar +33
The Antiproton Decelerator (AD) at CERN provides antiproton bunches with a kinetic energy of 5.3 MeV. The Extra-Low ENergy Antiproton ring at CERN, commissioned at the AD in 2018,…
Beam Charge Asymmetries for Deeply Virtual Compton Scattering on the Proton at CLAS12
E. Voutier, V. Burkert, S. Niccolai +76
The parameterization of the nucleon structure through Generalized Parton Distributions (GPDs) shed a new light on the nucleon internal dynamics. For its direct interpretation, Deep…
Upgrade of the positron system of the ASACUSA-Cusp experiment
A. Lanz, C. Amsler, H. Breuker +35
The ASACUSA-Cusp collaboration has recently upgraded the positron system to improve the production of antihydrogen. Previously, the experiment suffered from contamination of the va…
Slow positron production and storage for the ASACUSA-Cusp experiment
D. J. Murtagh, C. Amsler, H. Breuker +35
The ASACUSA Cusp experiment requires the production of dense positron plasmas with a high repetition rate to produce a beam of antihydrogen. In this work, details of the positron p…
SDR, EVC, and SDREVC: Limitations and Extensions
E. D. Hunter, C. Amsler, H. Breuker +34
Methods for reducing the radius, temperature, and space charge of nonneutral plasma are usually reported for conditions which approximate an ideal Penning Malmberg trap. Here we sh…
Measurement of the helicity asymmetry for the reaction in the resonance region
K. Chan, N. Zachariou, M. Bashkanov +9
The double-spin-polarization observable for has been measured with the CEBAF Large Acceptance Spectrometer (CLAS) at photon beam energies …
First measurement of hard exclusive electroproduction beam-spin asymmetries off the proton
S. Diehl, N. Trotta, K. Joo +142
The polarized cross section ratio from hard exclusive electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asym…
A new direct detection electron scattering experiment to search for the X17 particle
D. Dutta, H. Gao, A. Gasparian +57
A new electron scattering experiment (E12-21-003) to verify and understand the nature of hidden sector particles, with particular emphasis on the so-called X17 particle, has been a…
First CLAS12 measurement of DVCS beam-spin asymmetries in the extended valence region
CLAS Collaboration, G. Christiaens, M. Defurne +168
Deeply virtual Compton scattering (DVCS) allows one to probe Generalized Parton Distributions (GPDs) describing the 3D structure of the nucleon. We report the first measurement of…
A multidimensional study of the structure function ratio from hard exclusive electro-production off protons in the GPD regime
S. Diehl, A. Kim, K. Joo +151
A multidimensional extraction of the structure function ratio from the hard exclusive reaction above the resonance region has been pe…
First Measurement of Electroproduction off Nuclei in the Current and Target Fragmentation Regions
T. Chetry, L. El Fassi, W. K. Brooks +151
We report results of hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Contin…
First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12
H. Avakian, T. B. Hayward, A. Kotzinian +153
We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction, where two hadrons are produced in opp…
Alignment of the CLAS12 central hybrid tracker with a Kalman Filter
S. J. Paul, A. Peck, M. Arratia +131
Several factors can contribute to the difficulty of aligning the sensors of tracking detectors, including a large number of modules, multiple types of detector technologies, and no…
Observation of azimuth-dependent suppression of hadron pairs in electron scattering off nuclei
S. J. Paul, S. Moran, M. Arratia +142
We present the first measurement of di-hadron angular correlations in electron-nucleus scattering. The data were taken with the CLAS detector and a 5.0 GeV electron beam incident o…
Upgrade of ASACUSA's Antihydrogen Detector
V. Kraxberger, C. Amsler, H. Breuker +35
The goal of the ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) CUSP experiment at CERN's Antiproton Decelerator is to measure the ground state hyperfine splitt…
Cyclotron cooling to cryogenic temperature in a Penning-Malmberg trap with a large solid angle acceptance
C. Amsler, H. Breuker, S. Chesnevskaya +35
Magnetized nonneutral plasma composed of electrons or positrons couples to the local microwave environment via cyclotron radiation. The equilibrium plasma temperature depends on th…