6533b7d4fe1ef96bd1263301
RESEARCH PRODUCT
X(5) critical-point symmetries in 138Gd
P. RahkilaAndrea VitturiJ. LitzingerMatthew ReedPauli PeuraM. G. ProcterT. GrahnSteffen KetelhutYue ShiMichael TaylorD. M. CullenS Rinta-antillaA. Lopez-martensPaivi NieminenRauno JulinUlrika JakobssonP. J. R. MasonS. JuutinenA. DewaldPaul GreenleesFurong XuM. HacksteinPanu RuotsalainenPeter M. JonesStephen RiceK. HauschildThomas BraunrothMikael SandzeliusJuha UusitaloMatti LeinoJan SarénW. RotherJuha SorriC. ScholeyLorenzo FortunatoC. Fransensubject
PhysicsHistory010308 nuclear & particles physics[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]First order01 natural sciencesCritical point (mathematics)Computer Science ApplicationsEducationBohr modelSphericityKokeellinen ydinfysiikka21.10.Tg Lifetimes widths 27.60.+j 90(less-than-or-equal-to)A(less-than-or-equal-to)149 21.65.-f Nuclear matter 23.20.-g Electromagnetic transitions 21.10.Re Collective levels 21.60.Ev Collective modelssymbols.namesakeQuantum mechanics0103 physical sciencesHomogeneous spacesymbolsExperimental nuclear physics010306 general physicsHamiltonian (quantum mechanics)Axial symmetryExcitationdescription
International audience; The lifetimes of low-lying transitions in 138Gd have been measured using the recoil-distance Doppler-shift technique. The resultant reduced transition probabilities have been compared to X(5) critical-point calculations to assess the potential 'phase-transitional' behaviour of 138Gd. The X(5) symmetry describes the first order 'phase transition' between sphericity, U(5) and an axially deformed nuclear shape, SU(3). Although a high degree of correspondence is observed between the experimental and theoretical excitation energies, the large uncertainties of the experimental B(E2) values cannot preclude contributions from either vibrational or rotational modes of excitation. In order to further examine the nature of low-lying states in 138Gd, ongoing work is aiming to derive solutions to the Bohr Hamiltonian using a more general potential that is not restricted to the X(5) critical point. These results, in parallel to more extensive IBM-1 calculations, will eventually be compared to the experimental results to more accurately locate 138Gd along the U(5) − SU(3) arm of the structure triangle.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-01-01 |