Intruder configurations in neutron-richP34

Half-life of theIπ=4−intruder state in34P:MMason1, Alharbi2, Regan3 et al. 2012Phys. Rev. C16150View full textAdd to dashboardCite

“…The previously reported structure of 34 P includes a low-lying, yrast, I = 4 state at 2305 keV above the ground state. Several previous studies of this nucleus [5][6][7][8] have indicated a negative parity for this state, including a firm 4 − assignment by Bender et al [8], though…”

“…Ollier et al [7] suggested that the 2305-keV state had a spin-parity of 4 − and it was based predominantly on a πs 1/2 ⊗ νf 7/2 configuration, with the 2 + state to which it decays having a πs 1/2 ⊗ νd −1 3/2 character. Thus, the transition between these states would be expected to proceed via a νf 7/2 → νd 3/2 single-particle M2 transition.…”

Experimental study of nuclei in the vicinity of the “island of inversion” through the fusion-evaporation reaction

“…Nuclei in and around the "island of inversion" have in general been studied using transfer/deep inelastic reaction [1][2][3][4][5], or β-decay [6] or heavy ion inelastic scattering or deuteron inelastic scattering [7]. However such non-equilibrated reactions have certain limitations, like contamination from dominant fusion-evaporation channels, low production cross-sections, low spin population and coincident emissions from the binary partner.…”

Gamma-ray fast-timing coincidence measurements from the 18O+18O fusion–evaporation reaction using a mixed LaBr3-HPGe array

“…The total projection spectrum of the E γ -E γ coincidences matrices from the 18 O+ 18 O fusion evaporation reaction are shown in Figure 3 The level structure of 34 P has been investigated in a numeber of previous studies [12,9,8]. These studies identified the ground state to have I π = 1 + with the first excited state at excitation energy of 429 keV which has I π = 2 + .…”

“…The lowest lying, negative parity state, which correspond mainly to the 'cross-shell' excitation of a neutron from the d 3 2 orbital into a f 7 2 orbital, has been proposed to be the level at 2305 keV which has been assigned I π = 4 − . These studies assigned this state as negative parity on the basis of (i) gamma-ray angular correlation data which are consistent with an M2 multipole transition, possibly with some small E3 admixture [8,9] and (ii) other experiments using deep-inelastic reactions which have established limits of the lifetime of the decay of this state to the I π =2 + state at 429 keV of between 0.3 and 2.5 ns [12]. Figure 4 shows the resulting prompt coincidence time spectrum for the 429 keV level, resulting from gating on the gamma-ray energies of 1876 and 429 keV in the LaBr 3 (Ce) detectors and projecting their time difference, ∆T.…”