Are There Low-Lying Intruder States in ^8Be?
| dc.creator | Fayache, M. S. | |
| dc.creator | Zamick, L. | |
| dc.creator | Sharon, Y. Y. | |
| dc.date | 1997-06-26 | |
| dc.date.accessioned | 2026-07-07T05:42:03Z | |
| dc.date.available | 2026-07-07T05:42:03Z | |
| dc.description | We allow up to $4 \hbarω$ excitations in $^8Be$ relative to the basic configuration $(0s)^4(0p)^4$ in order to see if there are low-lying intruder states in $^8Be$. We use three interactions $-χQ \cdot Q, -χQ \cdot Q$ + spin-orbit, and a realistic (x,y) interaction, where for $x=1,y=1$ one gets values for the spin-orbit and tensor interactions which correspond closely to those of a non-relativistic $G$ matrix such as Bonn A. For the three interactions considered, if we allow up to $2 \hbar ω$ excitations we get the energy of the lowest $J=0^+$ intruder state to be at 32.1 MeV, 30.1 MeV and 33.8 MeV, respectively. If we allow up to $4 \hbarω$ excitations the corresponding values are 26.5 MeV, 26.5 MeV and 28.7 MeV. We thus support the statement made by E. Warburton in his 1986 $R$ matrix analysis of the $β^{\mp}$-delayed alpha spectra from the decay of $^8Li$ and $^8B$ that ``satisfactory fits are obtained without introducing intruder states below 26-MeV excitations'' (Phys. Rev. C 33, 303(1986)). In $^{10}Be$ however, with the first two ``$Q \cdot Q$'' interactions, we get (with up to $2 \hbar ω$ excitations) low-lying intruder states at 9.7 MeV and 11.9 MeV respectively. Thus the presence of low-lying intruder states in $^{10}Be$ (the $0^+_2$ state at 6.179 MeV may or may not be an intruder) does not imply that there are low-lying intruder states in $^8Be$. | |
| dc.description | 11 pages, no figures | |
| dc.identifier | https://arxiv.org/abs/nucl-th/9706073 | |
| dc.identifier | http://arxiv.org/abs/nucl-th/9706073 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/82796 | |
| dc.subject | Nuclear Theory | |
| dc.title | Are There Low-Lying Intruder States in ^8Be? | |
| dc.type | text |