Breakdown of the Z=8 Shell Closure in Unbound {sup 12}O and its Mirror Symmetry

Journal Article · Fri Oct 09 00:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.103.152503· OSTI ID:21370741

Suzuki, D; Iwasaki, H ^[1]; Beaumel, D; Assie, M; Blumenfeld, Y; De Sereville, N; Franchoo, S; Guillot, J; Hammache, F; Marechal, F; Ramus, A; Scarpaci, J -A; Stefan, I ^[2]; Nalpas, L; Pollacco, E; Drouart, A; Gillibert, A; Lapoux, V; Mougeot, X ^[3]; Baba, H ^[4]

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1. Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033 (Japan)
2. Institut de Physique Nucleaire, IN2P3-CNRS, Universite de Paris Sud, F-91406 Orsay (France)
3. CEA-Saclay, DSM/IRFU SPhN, F-91191 Gif sur Yvette Cedex (France)
4. RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)

An excited state in the proton-rich unbound nucleus {sup 12}O was identified at 1.8(4) MeV via missing-mass spectroscopy with the {sup 14}O(p,t) reaction at 51 AMeV. The spin-parity of the state was determined to be 0{sup +} or 2{sup +} by comparing the measured differential cross sections with distorted-wave calculations. The lowered location of the excited state in {sup 12}O indicates the breakdown of the major shell closure at Z=8 near the proton drip line. This demonstrates the persistence of mirror symmetry in the disappearance of the magic number 8 between {sup 12}O and its mirror partner {sup 12}Be.

• OSTI ID: 21370741
• Journal Information: Physical Review Letters, Vol. 103, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.103.152503; (c) 2009 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BERYLLIUM 12
DIFFERENTIAL CROSS SECTIONS
DISTORTED WAVE THEORY
EXCITED STATES
MEV RANGE 01-10
MISSING MASS
OXYGEN 12
OXYGEN 14 TARGET
PARITY
PROTON REACTIONS
PROTONS
SPECTROSCOPY
SPIN
SYMMETRY
ALKALINE EARTH ISOTOPES
ANGULAR MOMENTUM
BARYON REACTIONS
BARYONS
BERYLLIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
FERMIONS
HADRON REACTIONS
HADRONS
ISOTOPES
LIGHT NUCLEI
MASS
MEV RANGE
MILLISECONDS LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
OXYGEN ISOTOPES
PARTICLE PROPERTIES
RADIOISOTOPES
TARGETS