Pregled bibliografske jedinice broj: 397006
Measurement of the neutron-neutron scattering length using the π − d capture reaction
Measurement of the neutron-neutron scattering length using the π − d capture reaction // Physical Review C, 77 (2008), 5; 054002-1 doi:10.1103/PhysRevC.77.054002 (međunarodna recenzija, članak, znanstveni)
CROSBI ID: 397006 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Measurement of the neutron-neutron scattering length using the π − d capture reaction
Autori
Chen, Q. ; Howell, C. R. ; Carman, T. S. ; Gibbs, W. R. ; Gibson, B. F. ; Hussein, A. ; Kiser, M. R. ; Mertens, G. ; Moore, C. F. ; Morris, C. ; Obst, A. ; Pasyuk, E. ; Roper, C. D. ; Salinas, F. ; Setze, H. R. ; Šlaus, Ivo ; Sterbenz, S. ; Tornow, W. ; Walter, R. L. ; Whiteley, C. R. ; Whitton, M.
Izvornik
Physical Review C (0556-2813) 77
(2008), 5;
054002-1
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
neutron-neutron scattering; proton-proton scattering
Sažetak
We have determined a value for the 1S0 neutron-neutron scattering length (ann) from high-precision measurements of time-of-flight spectra of neutrons from the 2H(π − , n γ ) n capture reaction. The measurements were done at the Los Alamos Meson Physics Facility by the E1286 Collaboration. The high spatial resolution of our γ -ray detector enabled us tomake a detailed assessment of the systematic uncertainties in our techniques. The value obtained in the present work is ann = − 18.63 ± 0.10 (statistical) ± 0.44 (systematic) ± 0.30 (theoretical) fm. This result is consistent with previous determinations of ann from the π − d capture reaction. We found that the analysis of the data with calculations that use a relativistic phase-space factor gives a more negative value for ann by 0.33 fm over the analysis done using a nonrelativistic phase-space factor. Combining the present result with the previous ones from π − d capture gives ann = − 18.63 ± 0.27(expt) ± 0.30 fm (theory). For the first time the combined statistical and systematic experimental uncertainty in ann is smaller than the theoretical uncertainty and comparable to the uncertainty in the proton-proton 1S0 scattering length (app). This average value of ann when corrected for the magnetic-moment interaction of the two neutrons becomes − 18.9 ± 0.4 fm, which is 1.6 ± 0.5 fm different from the recommended value of app, thereby confirming charge symmetry breaking at the 1% confidence level.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
Napomena
Art. no. 054002
POVEZANOST RADA
Projekti:
098-0000000-3194 - Nuklearne Interakcije
Ustanove:
Institut "Ruđer Bošković", Zagreb
Profili:
Ivo Šlaus
(autor)
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus