Progress on the BL2 beam measurement of the neutron lifetime.

Autor: Hoogerheide SF; National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Caylor J; University of Tennessee, Knoxville, TN 37996, USA., Adamek ER; University of Tennessee, Knoxville, TN 37996, USA., Anderson ES; Indiana University, Bloomington, IN 47408, USA., Biswas R; Tulane University, New Orleans, LA 70118, USA., Chavali SM; University of Maryland, College Park, MD 20742, USA., Crawford B; Gettysburg College, Gettysburg, PA 17325, USA., DeAngelis C; Tulane University, New Orleans, LA 70118, USA., Dewey MS; National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Fomin N; University of Tennessee, Knoxville, TN 37996, USA., Gilliam DM; National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Grammer KB; Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Greene GL; University of Tennessee, Knoxville, TN 37996, USA.; Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Haun RW; Tulane University, New Orleans, LA 70118, USA., Ivanov JA; Georgetown University, Washington, DC 20057, USA., Li F; Gettysburg College, Gettysburg, PA 17325, USA., Mulholland J; University of Tennessee, Knoxville, TN 37996, USA., Mumm HP; National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Nico JS; National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Snow WM; Indiana University, Bloomington, IN 47408, USA., Valete D; Gettysburg College, Gettysburg, PA 17325, USA., Wietfeldt FE; Tulane University, New Orleans, LA 70118, USA., Yue AT; National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Jazyk: angličtina
Zdroj: EPJ web of conferences [EPJ Web Conf] 2019; Vol. 219.
DOI: 10.1051/epjconf/201921903002
Abstrakt: A precise value of the neutron lifetime is important in several areas of physics, including determinations of the quark-mixing matrix element │ V ud │, related tests of the Standard Model, and predictions of light element abundances in Big Bang Nucleosynthesis models. We report the progress on a new measurement of the neutron lifetime utilizing the cold neutron beam technique. Several experimental improvements in both neutron and proton counting that have been developed over the last decade are presented. This new effort should yield a final uncertainty on the lifetime of 1 s with an improved understanding of the systematic effects.
Databáze: MEDLINE