Spectroscopy of {sup 36}Mg: Interplay of Normal and Intruder Configurations at the Neutron-Rich Boundary of the 'Island of Inversion'

Journal Article · Fri Aug 17 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.072502· OSTI ID:21028142

Gade, A; Bowen, M D; Brown, B A; Campbell, C M; Cook, J M; Glasmacher, T; McDaniel, S; Ratkiewicz, A; Siwek, K; Terry, J R ^[1]; Adrich, P; Bazin, D; Ettenauer, S; Obertelli, A; Weisshaar, D ^[1]; Kemper, K W ^[2]; Otsuka, T ^[3]; Tostevin, J A ^[4]; Utsuno, Y ^[5]

---

1. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
2. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
3. Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033 (Japan)
4. Department of Physics, School of Electronics and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH (United Kingdom)
5. Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan)

We report on the first spectroscopy study of the very neutron-rich nucleus {sub 12}{sup 36}Mg{sub 24} using the direct two-proton knockout reaction {sup 9}Be({sup 38}Si,{sup 36}Mg+{gamma})X at 83 MeV/nucleon. The energy of the first excited 2{sup +} state of {sup 36}Mg, E(2{sub 1}{sup +})=660(6) keV, was measured. The magnitude of the partial cross sections to the ground state and the 2{sub 1}{sup +} state is indicative of strong intruder admixtures in the lowest-lying states as suggested by Monte Carlo shell-model calculations.

• OSTI ID: 21028142
• Journal Information: Physical Review Letters, Vol. 99, Issue 7; Other Information: DOI: 10.1103/PhysRevLett.99.072502; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BERYLLIUM 9 TARGET
CROSS SECTIONS
ENERGY-LEVEL TRANSITIONS
GROUND STATES
KEV RANGE 100-1000
KNOCK-OUT REACTIONS
MAGNESIUM 36
MEV RANGE 10-100
MONTE CARLO METHOD
NEUTRON-RICH ISOTOPES
PROTONS
SHELL MODELS
SILICON 38
SPECTROSCOPY