wovepaper — the arXiv observatory

papers

Publications (35)

nucl-ex2018

Deuteron photodisintegration by polarized photons in the region of the $d^{*} (2380)$

M. Bashkanov, S. Kay, D. P. Watts +70

We report the first large-acceptance measurement of the beam-spin asymmetry for deuteron photodisintegration ( $I^^{3} d \to p n$ ) in the photon energy range $400 < E_{I^}^{3} < 630$ ~MeV. The m…

hep-ex2017

Measurement of the omega -> pi^0 e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI

P. Adlarson, F. Afzal, P. Aguar-BartolomÃ© +92

The Dalitz decays eta -> e^+e^-g and omega -> pi^0 e^+e^- have been measured in the g p -> eta p and g p -> omega p reactions, respectively, with the A2 tagged-photon facility at t…

nucl-ex2023

First measurement of polarisation transfer $C_{x^{'}}^{n}$ in deuteron photodisintegration

M. Bashkanov, D. P. Watts, S. J. D. Kay +66

A first measurement of the polarisation transfer from a circularly-polarised photon to the final state neutron ( $C_{x^{'}}^{n}$ ) in deuterium photodisintegration has been carried out. T…

physics.ins-det2012

Characterisation and calibration of a scintillating fibre detector with > 4000 multi-anode photomultiplier channels

A. Esser, P. Achenbach, C. Ayerbe Gayoso +3

In the Kaos spectrometer at the Mainz Microtron a high-resolution coordinate detector for high-energy particles is operated. It consists of scintillating fibres with diameters of <…

nucl-ex2019

Cross Section for $I^^{3} n \to I ¨ ^{0} n$ measured at Mainz/A2

W. J. Briscoe, M. Hadzimehmedovi, A. E. Kudryavtsev +89

The $I^^{3} n \to I ¨ ^{0} n$ differential cross section evaluated for 27 energy bins span the photon-energy range 290-813 MeV (W = 1.195-1.553 GeV) and the pion c.m. polar production angle…

nucl-ex2024

First measurement using elliptically polarized photons of the double-polarization observable $E$ for $I^^{3} p \to p I ¨ ^{0}$ and $I^^{3} p \to n I ¨ ^{+}$

A2 Collaboration, F. Afzal, K. Spieker +74

We report the measurement of the helicity asymmetry $E$ for the $p I ¨ ^{0}$ and $n I ¨ ^{+}$ final states using, for the first time, an elliptically polarized photon beam in combination wit…

nucl-ex2022

Neutron polarisation transfer, $C_{x^{'}}^{n}$ , in $I ¨ ^{+}$ photoproduction off the proton

M. Bashkanov, D. P. Watts, S. J. D. Kay +63

We report a first measurement of the double-polarisation observable, $C_{x^{'}}$ , in $I ¨ ^{+}$ photoproduction off the proton. The $C_{x^{'}}$ double-polarisation observable represents the…

nucl-ex2021

Single $I ¨ ^{0}$ Production Off Neutrons Bound in Deuteron with Linearly Polarized Photons

C. Mullen, S. Gardner, D. I. Glazier +79

The quasifree $I^^{3} d \to I ¨ ^{0} n (p)$ photon beam asymmetry, $I^£$ , has been measured at photon energies, $E_{I^}^{3}$ , from 390 to 610 MeV, corresponding to center of mass energ…

nucl-ex2018

Study of the $I^^{3} p \to I ¨ ^{0} I^\cdot p$ reaction with the A2 setup at MAMI

V. Sokhoyan, S. Prakhov, A. Fix +99

The data available from the A2 Collaboration at MAMI were analyzed to select the $I^^{3} p \to I ¨ ^{0} I^\cdot p$ reaction on an event-by-event basis, which allows for partial-wave analyses of thr…

nucl-ex2020

Measurement of the beam-helicity asymmetry in photoproduction of $I ¨ ^{0} I^\cdot$ pairs on carbon, aluminum, and lead

V. Sokhoyan, S. Prakhov, A. Fix +88

The beam-helicity asymmetry was measured, for the first time, in photoproduction of $I ¨ ^{0} I^\cdot$ pairs on carbon, aluminum, and lead, with the A2 experimental setup at MAMI. The resu…

physics.ins-det2021

Operation and characterization of a windowless gas jet target in high-intensity electron beams

B. S. Schlimme, S. Aulenbacher, P. Brand +54

A cryogenic supersonic gas jet target was developed for the MAGIX experiment at the high-intensity electron accelerator MESA. It will be operated as an internal, windowless target…

nucl-ex2026

Measurement of the Gerasimov-Drell-Hearn integrand for proton and deuteron from 200 to 1400 MeV

P. Pedroni, F. Afzal, S. Abt +59

New data for the total inclusive helicity-dependent cross section for the proton and deuteron were obtained in the photon energy interval 200-1400 MeV. The experiment was performed…

nucl-ex2022

Low- $Q^{2}$ elastic electron-proton scattering using a gas jet target

Y. Wang, J. C. Bernauer, B. S. Schlimme +54

In this paper, we describe an experiment measuring low- $Q^{2}$ elastic electron-proton scattering using a newly developed cryogenic supersonic gas jet target in the A1 three-spectrom…

hep-ex2022

Target and beam-target asymmetries for the $I^^{3} p \to I ¨ ^{0} I ¨ ^{0} p$ reaction

S. Garni, V. L. Kashevarov, A. Fix +81

Background: Photoproduction of pion pairs allows to study sequential decays of nucleon resonances via excited intermediate states. Such decays are important e.g. for states which i…

nucl-ex2018

Experimental study of the $I^^{3} p \to K^{0} I^£^{+}$ , $I^^{3} n \to K^{0} I^$ , and $I^^{3} n \to K^{0} I^£^{0}$ reactions at the Mainz Microtron

C. S. Akondi, K. Bantawa, D. M. Manley +78

This work measured $d I ¨ / d I^c ◯$ for neutral kaon photoproduction reactions from threshold up to a c.m.\ energy of 1855MeV, focussing specifically on the $I^^{3} p \to K^{0} I^£^{+}$ , $Î³n…

nucl-ex2018

First measurement of helicity-dependent cross sections in pi0-eta photoproduction from quasi-free nucleons

A. KÃ¤ser, M. Dieterle, L. Witthauer +80

The helicity-dependent cross sections for the photoproduction of $I ¨ ^{0} I^\cdot$ pairs have been measured for the first time. The experiment was performed at the tagged photon facility of…

hep-ex2026

New high-statistics measurement of the $I ¨ ^{0} \to e^{+} e^{-} I^^{3}$ Dalitz decay at the Mainz Microtron

S. Prakhov, L. HeijkenskjÃ¶ld, S. Abt +69

The Dalitz decay $I ¨ ^{0} \to e^{+} e^{-} I^^{3}$ has been measured with the highest statistical accuracy obtained so far in the $I^^{3} p \to I ¨ ^{0} p$ reaction with the A2 tagged-photon facility at t…

nucl-ex2024

Evaluation of the E2/M1 ratio in the $N \to I^ (1232)$ transition from the $I^^{3} p \to p I ¨ ^{0}$ reaction

E. Mornacchi, P. Pedroni, F. Afzal +59

A new data set for the helicity-dependent differential cross section of the single-meson photoproduction reaction $I^^{3} p \to p I ¨ ^{0}$ was obtained for the photon energy interval 150…

nucl-ex2022

Measurement of Compton scattering at MAMI for the extraction of the electric and magnetic polarizabilities of the proton

A2 Collaboration, E. Mornacchi, P. P. Martel +65

A precise measurement of the differential cross-sections $d I ¨ / d I^c ◯$ and the linearly polarized photon beam asymmetry $I^£_{3}$ for Compton scattering on the proton below pion threshold…

physics.ins-det2021

Electron beam studies of light collection in a scintillating counter with embedded fibers

M. LauÃ, P. Achenbach, S. Aulenbacher +28

The light collection of several fiber configurations embedded in a box-shaped plastic scintillating counter was studied by scanning with minimum ionizing electrons. The light was r…

hep-ex2018

High-statistics measurement of the eta->3pi^0 decay at the Mainz Microtron

S. Prakhov, S. Abt, P. Achenbach +85

The largest, at the moment, statistics of 7x10^6 eta->3pi^0 decays, based on 6.2x10^7 eta mesons produced in the gamma p -> eta p reaction, has been accumulated by the A2 Collabora…

nucl-ex2020

Spin polarizabilities of the proton by measurement of Compton double-polarization observables

D. Paudyal, P. P. Martel, G. M. Huber +90

The Compton double-polarization observable $I^£_{2 z}$ has been measured for the first time in the $I^ (1232)$ resonance region using a circularly polarized photon beam incident on a…

nucl-ex2017

Insight into the narrow structure in {\boldmath{ $I^\cdot$ }}-photoproduction on the neutron from helicity dependent cross sections

L. Witthauer, M. Dieterle, S. Abt +83

The double polarization observable $E$ and the helicity dependent cross sections $I ¨ _{1/2}$ and $I ¨ _{3/2}$ were measured for $I^\cdot$ photoproduction from quasi-free protons and neutro…

physics.ins-det2025

Measurement of the $^{40}$ Ar(e,e $^{'}$ ) elastic scattering cross section with a novel gas-jet target

M. Littich, L. Doria, P. Brand +35

We report on a measurement of elastic electron scattering on argon performed with a novel cryogenic gas-jet target at the Mainz Microtron accelerator MAMI. The luminosity is estima…

nucl-ex2023

Helicity dependent cross sections for the photoproduction of $I ¨ ^{0} I ¨ ^{\pm}$ pairs from quasi-free nucleons

A2 Collaboration, D. Ghosal, V. Sokhoyan +71

Photoproduction of $I ¨ ^{0} I ¨ ^{\pm}$ -pairs from quasifree nucleons bound in the deuteron has been investigated to study the helicity dependence of this reaction. Measurements with a l…

physics.ins-det2018

Precision beam energy measurement by undulator radiation at MAMI

P. Klag, P. Achenbach, M. Biroth +10

A novel interferometric method for absolute beam energy measurement is under development at MAMI. At the moment, the method is tested and optimized at an energy of 195 MeV. Despite…

nucl-ex2022

Measurement of the helicity dependence for single $I ¨ ^{0}$ photoproduction from the deuteron

The A2 collaboration, F. Cividini, M. Dieterle +72

The helicity-dependent single $I ¨ ^{0}$ photoproduction cross section on the deuteron and the angular dependence of the double polarisation observable $E$ for the quasi-free single…

nucl-ex2018

Photoproduction of {\boldmath{ $I ¨ ^{0}$ }} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region

M. Dieterle, D. WerthmÃ¼ller, S. Abt +81

Photoproduction of mesons off quasi-free nucleons bound in the deuteron allows to study the electromagnetic excitation spectrum of the neutron and the isospin structure of the exci…

nucl-ex2016

Photon asymmetry measurements of $I^^{3} p \to I ¨ ^{0} p$ for E $_{I^}^{3}$ =320 $-$ 650 MeV

S. Gardner, D. Howdle, M. H. Sikora +97

High statistics measurements of the photon asymmetry $I^£$ for the $I^^{3}$ p $\to I ¨ ^{0}$ p reaction have been made in the center of mass energy range W=1214-…

nucl-ex2017

Helicity-dependent cross sections and double-polarization observable E in eta photoproduction from quasi-free protons and neutrons

L. Witthauer, M. Dieterle, S. Abt +84

Precise helicity-dependent cross sections and the double-polarization observable $E$ were measured for $I^\cdot$ photoproduction from quasi-free protons and neutrons bound in the deuter…

nucl-ex2020

Helicity-dependent cross sections for the photoproduction of $I ¨ ^{0}$ pairs from nucleons

M. Dieterle, L. Witthauer, A. Fix +88

The double-polarization observable $E$ and helicity-dependent cross sections $I ¨ _{1/2}$ , $I ¨ _{3/2}$ have been measured for the photoproduction of $I ¨ ^{0}$ pairs off quasi-free proton…

hep-ex2017

Measurement of the pi^0 -> e^+e^-gamma Dalitz decay at the Mainz Microtron

The Dalitz decay pi^0 -> e^+e^-gamma has been measured in the gamma p -> pi^0 p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the…

nucl-ex2019

Signatures of the $d^{*} (2380)$ hexaquark in d( $I^^{3}$ , $p n$ )

M. Bashkanov, D. P. Watts, S. J. D. Kay +74

We report a measurement of the spin polarisation of the recoiling neutron in deuterium photodisintegration, utilising a new large acceptance polarimeter within the Crystal Ball at…

physics.ins-det2018

Novel optical interferometry of synchrotron radiation for absolute electron beam energy measurements

P. Klag, P. Achenbach, M. Biroth +10

A novel interferometric method is presented for the measurement of the absolute energy of electron beams. In the year 2016, a pioneering experiment was performed using a 195 MeV be…

nucl-ex2017

First measurement of the polarization observable $E$ and helicity-dependent cross sections in single $I ¨ ^{0}$ photoproduction from quasi-free nucleons

M. Dieterle, L. Witthauer, F. Cividini +84

The double-polarization observable $E$ and the helicity-dependent cross sections $I ¨ _{1/2}$ and $I ¨ _{3/2}$ have been measured for the first time for single $I ¨ ^{0}$ photoproduction…

Publications (35)

Deuteron photodisintegration by polarized photons in the region of the d∗(2380)

Measurement of the omega -> pi^0 e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI

First measurement of polarisation transfer Cx′n​ in deuteron photodisintegration

Characterisation and calibration of a scintillating fibre detector with > 4000 multi-anode photomultiplier channels

Cross Section for I^3n→I¨0n measured at Mainz/A2

First measurement using elliptically polarized photons of the double-polarization observable E for I^3p→pI¨0 and I^3p→nI¨+

Neutron polarisation transfer, Cx′n​, in I¨+ photoproduction off the proton

Single I¨0 Production Off Neutrons Bound in Deuteron with Linearly Polarized Photons

Study of the I^3p→I¨0I^⋅p reaction with the A2 setup at MAMI

Measurement of the beam-helicity asymmetry in photoproduction of I¨0I^⋅ pairs on carbon, aluminum, and lead

Operation and characterization of a windowless gas jet target in high-intensity electron beams

Measurement of the Gerasimov-Drell-Hearn integrand for proton and deuteron from 200 to 1400 MeV

Low-Q2 elastic electron-proton scattering using a gas jet target

Target and beam-target asymmetries for the I^3p→I¨0I¨0p reaction

Experimental study of the I^3p→K0I^£+, I^3n→K0I^, and I^3n→K0I^£0 reactions at the Mainz Microtron

First measurement of helicity-dependent cross sections in pi0-eta photoproduction from quasi-free nucleons

New high-statistics measurement of the I¨0→e+e−I^3 Dalitz decay at the Mainz Microtron

Evaluation of the E2/M1 ratio in the N→I^(1232) transition from the I^3p​→pI¨0 reaction

Measurement of Compton scattering at MAMI for the extraction of the electric and magnetic polarizabilities of the proton

Electron beam studies of light collection in a scintillating counter with embedded fibers

High-statistics measurement of the eta->3pi^0 decay at the Mainz Microtron

Spin polarizabilities of the proton by measurement of Compton double-polarization observables

Insight into the narrow structure in {\boldmath{I^⋅}}-photoproduction on the neutron from helicity dependent cross sections

Measurement of the 40Ar(e,e′) elastic scattering cross section with a novel gas-jet target

Helicity dependent cross sections for the photoproduction of I¨0I¨± pairs from quasi-free nucleons

Precision beam energy measurement by undulator radiation at MAMI

Measurement of the helicity dependence for single I¨0 photoproduction from the deuteron

Photoproduction of {\boldmath{I¨0}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region

Photon asymmetry measurements of I^3p→I¨0p for EI^3​=320−650 MeV

Helicity-dependent cross sections and double-polarization observable E in eta photoproduction from quasi-free protons and neutrons

Helicity-dependent cross sections for the photoproduction of I¨0 pairs from nucleons

Measurement of the pi^0 -> e^+e^-gamma Dalitz decay at the Mainz Microtron

Signatures of the d∗(2380) hexaquark in d(I^3,pn)

Novel optical interferometry of synchrotron radiation for absolute electron beam energy measurements

First measurement of the polarization observable E and helicity-dependent cross sections in single I¨0 photoproduction from quasi-free nucleons

Deuteron photodisintegration by polarized photons in the region of the $d^{*} (2380)$

First measurement of polarisation transfer $C_{x^{'}}^{n}$ in deuteron photodisintegration

Cross Section for $I^^{3} n \to I ¨ ^{0} n$ measured at Mainz/A2

First measurement using elliptically polarized photons of the double-polarization observable $E$ for $I^^{3} p \to p I ¨ ^{0}$ and $I^^{3} p \to n I ¨ ^{+}$

Neutron polarisation transfer, $C_{x^{'}}^{n}$ , in $I ¨ ^{+}$ photoproduction off the proton

Single $I ¨ ^{0}$ Production Off Neutrons Bound in Deuteron with Linearly Polarized Photons

Study of the $I^^{3} p \to I ¨ ^{0} I^\cdot p$ reaction with the A2 setup at MAMI

Measurement of the beam-helicity asymmetry in photoproduction of $I ¨ ^{0} I^\cdot$ pairs on carbon, aluminum, and lead

Low- $Q^{2}$ elastic electron-proton scattering using a gas jet target

Target and beam-target asymmetries for the $I^^{3} p \to I ¨ ^{0} I ¨ ^{0} p$ reaction

Experimental study of the $I^^{3} p \to K^{0} I^£^{+}$ , $I^^{3} n \to K^{0} I^$ , and $I^^{3} n \to K^{0} I^£^{0}$ reactions at the Mainz Microtron

New high-statistics measurement of the $I ¨ ^{0} \to e^{+} e^{-} I^^{3}$ Dalitz decay at the Mainz Microtron

Evaluation of the E2/M1 ratio in the $N \to I^ (1232)$ transition from the $I^^{3} p \to p I ¨ ^{0}$ reaction

Insight into the narrow structure in {\boldmath{ $I^\cdot$ }}-photoproduction on the neutron from helicity dependent cross sections

Measurement of the $^{40}$ Ar(e,e $^{'}$ ) elastic scattering cross section with a novel gas-jet target

Helicity dependent cross sections for the photoproduction of $I ¨ ^{0} I ¨ ^{\pm}$ pairs from quasi-free nucleons

Measurement of the helicity dependence for single $I ¨ ^{0}$ photoproduction from the deuteron

Photoproduction of {\boldmath{ $I ¨ ^{0}$ }} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region

Photon asymmetry measurements of $I^^{3} p \to I ¨ ^{0} p$ for E $_{I^}^{3}$ =320 $-$ 650 MeV

Helicity-dependent cross sections for the photoproduction of $I ¨ ^{0}$ pairs from nucleons

Signatures of the $d^{*} (2380)$ hexaquark in d( $I^^{3}$ , $p n$ )

First measurement of the polarization observable $E$ and helicity-dependent cross sections in single $I ¨ ^{0}$ photoproduction from quasi-free nucleons