2000/12/15 by T. Siiskonen, M. Hjorth-Jensen, M. Hjorth‐Jensen +1 · 1 citation
Physics and Astronomy · #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #Scientific Research and Discoveries #nucl-th
paper · pdf · doi:10.1103/physrevc.63.055501
published as Phys.Rev. C63 (2001) 055501 · 28 pages, 6 figures
arxiv created 2000/12/15 · openalex publication_date 2001/04/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The renormalization of the weak charge-changing hadronic current as a function of the reaction energy release is studied at the nucleonic level. We have calculated the average quenching factors for each type of current (vector, axial vector, and induced pseudoscalar). The obtained quenching in the axial vector part is, at zero momentum transfer, 19% for the 1s0d shell and 23% in the 1p0f shell. We have extended the calculations also to heavier systems such as 56Ni and 100Sn, where we obtain stronger quenchings, 44% and 59%, respectively. Gamow-Teller-type transitions are discussed, along with the higher-order matrix elements. The quenching factors are constant up to roughly 60 MeV momentum transfer. Therefore the use of energy-independent quenching factors in beta decay is justified. We also found that going beyond the zeroth and first order operators (in inverse nucleon mass) does not give any substantial contribution. The extracted renormalization to the ratio CP/CA at q=100 MeV is \ensuremath-3.5%, \ensuremath-7.1%, \ensuremath-28.6%, and +8.7% for mass 16, 40, 56, and 100, respectively.