Mass predictions by modified ensemble averaging

New island of cluster emitters

“…Otherwise, we try the mass estimations [12] one after the other, and then we compare the results. The following mass codes are conventionally adopted: C = 3 for the estimations of Jänecke and Masson [13], C = 2 for Masson and Jänecke [14], C = 4 for Spanier and Johansson [15], C = 5 for Tachibana et al [16], C = 6 for Satpathy and Nayak [17], C = 7 for Comay, Kelson, and Zidon [18], and C = 8 for Möller et al [19].…”

Essential reduction of discrepancies between mass values of nuclei withZ>N predicted by different approaches

“…Authors [2][3][4] use the results of the phenomenological shell model description for AEc reported in I- 6,7]. In the case of diagonal nuclei, protons and neutrons of which are disposed in the same shell, the shell model expression for AEc takes the form…”

“…However, if one considers nuclei far from stability it turns out that the predictions of M(Z, N) values differ greatly even in works which allow for properties of mirror nuclei. As an example, root-mean-square value (6) which characterizes the differences of mass predictions given in [2] and [5] calculated on 313 nuclei amounts to 0.78 MeV. Considerable discrepancies between mass values of nuclei with Z >N predicted in various works limit their use and raise the question of reasons which account for such discrepancies.…”

“…In the last survey 1-1] of experimental mass values of nuclei and their predictions the results of four papers [2][3][4][5] are presented which account for the charge independence of nuclear forces when calculating masses M(Z, N) of nuclei with Z >N. M(Z, N) values calculated in these papers agree with experimental data much better than in other works which do not take into consideration the properties of mirror nuclei. However, if one considers nuclei far from stability it turns out that the predictions of M(Z, N) values differ greatly even in works which allow for properties of mirror nuclei.…”

“…M(Z, N) values in papers [2][3][4] are defined employing the Garvey-Kelson equation for mirror nuclei…”