6533b86dfe1ef96bd12ca782
RESEARCH PRODUCT
Migration of Nuclear Shell Gaps Studied in thed(Ne24,pγ)Ne25Reaction
M. RejmundJ.m. CasadjianLuis CaballeroV. P. E. PucknellW. N. CatfordS.d. PainN. A. OrrN. A. OrrN.l. AchouriN.l. AchouriB. Fernández-domínguezCh. TheisenW. GelletlyN. CurtisC. N. TimisN. AmzalH. SavajolsMarielle ChartierN. I. AshwoodT. D. BaldwinD. D. WarnerO. SorlinRobert ChapmanM. BurnsX. LiangB. RubioK. M. SpohrRoy Crawford LemmonM. FreerM. Labichesubject
PhysicsNuclear reactionAngular momentum010308 nuclear & particles physicsAstrophysics::High Energy Astrophysical PhenomenaHadronGeneral Physics and AstronomyElementary particle01 natural sciencesNuclear physicsBaryon0103 physical sciencesNeutronAtomic physics010306 general physicsNucleonRadioactive decaydescription
The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state's identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2- and 3/2- levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-05-10 | Physical Review Letters |