All

What are you looking for?

All
Projects
Results
Organizations

Quick search

  • Projects supported by TA ČR
  • Excellent projects
  • Projects with the highest public support
  • Current projects

Smart search

  • That is how I find a specific +word
  • That is how I leave the -word out of the results
  • “That is how I can find the whole phrase”

The large COMPASS polarized solid ammonia target for Drell-Yan measurements with a pion beam

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F22%3A00556655" target="_blank" >RIV/68081731:_____/22:00556655 - isvavai.cz</a>

  • Alternative codes found

    RIV/00216208:11320/22:10441078 RIV/00216208:11320/22:10458277

  • Result on the web

    <a href="https://www.sciencedirect.com/science/article/pii/S0168900221009918" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0168900221009918</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.nima.2021.166069" target="_blank" >10.1016/j.nima.2021.166069</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    The large COMPASS polarized solid ammonia target for Drell-Yan measurements with a pion beam

  • Original language description

    The transversely polarized target (PT) of the COMPASS (NA58) collaboration at CERN has been used for Drell-Yan measurements in 2015 and 2018. The transverse spin structure of the proton has been studied using a negative pion beam and a solid ammonia target. Employing the dynamic nuclear polarization (DNP) method, proton polarization values of more than 80% have been routinely achieved after one day, at a homogeneous magnetic field of 2.5 T and using a He-3/He-4 dilution refrigerator. During the data-taking the target operates in a transversely oriented magnetic dipole field at 0.6 T. This so-called frozen spin operation mode without the DNP pumping process leads to a slow depolarization of the target material, which is further accelerated by the heat input of the pion beam, produced secondary particles and radiation damage effects to the target material. Ammonia has the highest resistance against radiation-induced depolarization among known solid target materials. The proton polarization has been measured by the nuclear magnetic resonance (NMR). Relaxation times of about 1100 h have been observed for the proton polarization resulting in an average polarization between 68% and 76% during about two weeks long data-taking periods. To achieve a systematic uncertainty of the polarization Delta P/P as low as 3.2% and a statistical one of less than 1.8% two large target cells with appropriate positioning of the NMR-coils have been built.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10303 - Particles and field physics

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2022

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Nuclear Instruments & Methods in Physics Research Section A

  • ISSN

    0168-9002

  • e-ISSN

    1872-9576

  • Volume of the periodical

    1025

  • Issue of the periodical within the volume

    11 February

  • Country of publishing house

    NL - THE KINGDOM OF THE NETHERLANDS

  • Number of pages

    10

  • Pages from-to

    166069

  • UT code for WoS article

    000777573700004

  • EID of the result in the Scopus database

    2-s2.0-85121588847