Nuclear Data Sheets for A = 25

Si25andS29studied via single neutron knockout rea

“…[15], 25 Si from the USDB shell model, and from the isospin mirror 25 Na from Ref. [18]. The J π values shown correspond to those given by the shell-model calculations.…”

“…Considering the efficiency of detecting a γ ray of energy near 1900 keV, it would be detectable if it had an efficiency-adjusted intensity about equal to that of the 1088-keV γ ray. The states observed in the mirror reaction, 26 Mg(d, 3 He) 25 Na [18] are also shown in Fig. 2.…”

Coulomb dissociation ofP27at 500 MeV/u

“…However, such an intruder state can be expected from the trend of negative-parity states in the neighboring odd-A isobar chains. For A = 27 isobars the situation is unclear [10], but for A = 25 [16] and A = 29 [17] isobars, a shift of negative-parity states to lower excitation energies as compared to positive-parity states is observed when the nuclei become 045811-3 more proton rich. In addition, the splitting of the f 7/2 state in a spherical nucleus into J = 1/2 − ,3/2 − ,5/2 − , and 7/2 − levels for a prolate nucleus as predicted by the Nilsson model [18] suggests a lowering of the 3/2 − level.…”

Excited states in the neutron-rich nucleus F25

“…Adding a single valence proton to the doubly closed-shell nucleus 24 O, 25 F is expected to have a rather simple structure. Its energy spectrum can be described up to the neutron separation energy of 4.36(12) MeV [8] as a few single-proton states coupled to the ground and first excited states of 24 O. Deviations from this straightforward picture may arise from the following: 25 F is expected to be located at the frontier of emerging new structures induced by intruder configurations, possibly leading to cluster configurations at low excitation energy. Recent cluster-model calculations [9] showed that the energy of cluster states associated with proton cross shell excitations increased with increasing neutron number among the fluorine isotopes.…”