Nuclear data sheets for A = 47

Abstract

Level schemes, spin and parity assignments, and decay properties are presented for all nuclei with mass number A = 47. Experimental data and adopted values are given along with conclusions as to the best spin and parity assignments. The presentation of the nuclear properties is given in the light of the data and current theoretical ideas. Inconsistencies in the data are discussed wherever they are noted by the compiler. While a few levels in each of the A = 47 nuclei appear to be well represented as ‘shell model’ states, it is clear that there are may more low-lying complex states than have been accounted for by model calculations. As one views the nuclei from 47K to 47V it may be noted that simple shell properties deteriorate in the sense that (a) the single-particle strengths become increasingly fragmented, (b) the most strongly bound states become no longer the single-particle type (i.e., have small spectroscopic factors), and (c) the 2s 1/2, d 3/2, and 2p shell nucleons become increasingly important for the lowest levels as the proton and neutron numbers increase beyond 20 and decrease below 28, respectively. The experimental data for A = 47 nuclei indicate the need for more measurements such as transition rates and multi-nucleon transfer reaction cross sections in order to determine the more complex nature of the low-lying levels. The gamma-ray properties in 47Ca are poorly known, and only two levels in 47K have been identified. Very little data exist on high-spin (J > 7/2) states expected in this region. All the tabulated C 2S and C 2S direct-reaction strengths are derived from distorted-wave Born approximation reaction theory. The reader is referred to the individual papers for details of the calculations. The adopted level and decay properties are based on data received before March 1970.