Published September 1, 2006 | Version v1
Journal article Metadata-only

Reduction of the Spin-Orbit Splittings at the N=28 Shell Closure

Creators

  • 1. GANIL, BP 55027, F-14076 Caen Cedex 5 (France)
  • 2. IPN, IN2P3-CNRS, F- 91406 Orsay Cedex (France)
  • 3. Institute of Nuclear Research, H-4001 Debrecen, Pf. 51 (Hungary)
  • 4. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)

Description

The N=28 shell closure has been investigated via the 46Ar(d,p)47Ar transfer reaction in inverse kinematics. Energies and spectroscopic factors of the neutron p3/2, p1/2, and f5/2 states in 47Ar were determined and compared to those of the 49Ca isotone. We deduced a reduction of the N=28 gap by 330(90) keV and spin-orbit weakenings of ≅10(2) and 45(10)% for the f and p states, respectively. Such large variations for the f and p spin-orbit splittings could be accounted for by the proton-neutron tensor force and by the density dependence of the spin-orbit interaction, respectively. This contrasts with the picture of the spin-orbit interaction as a surface term only

Additional details

Identifiers

DOI
10.1103/PhysRevLett.97.092501;

Publishing Information

Journal Title
Physical Review Letters
Journal Volume
97
Journal Issue
9
Journal Page Range
p. 092501-092501.4
ISSN
0031-9007
CODEN
PRLTAO

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
38023704
Subject category
S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
Descriptors DEI
ARGON 46; ARGON 47; CALCIUM 49; DEUTERON REACTIONS; KEV RANGE 100-1000; L-S COUPLING; NEUTRONS; P STATES; PROTON-NEUTRON INTERACTIONS; PROTONS; SPECTROSCOPIC FACTORS; SPIN; TENSOR FORCES; TRANSFER REACTIONS
Descriptors DEC
ALKALINE EARTH ISOTOPES; ANGULAR MOMENTUM; ARGON ISOTOPES; BARYON-BARYON INTERACTIONS; BARYONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CALCIUM ISOTOPES; CHARGED-PARTICLE REACTIONS; COUPLING; DIMENSIONLESS NUMBERS; DIRECT REACTIONS; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; FERMIONS; HADRON-HADRON INTERACTIONS; HADRONS; INTERACTIONS; INTERMEDIATE COUPLING; INTERMEDIATE MASS NUCLEI; ISOTOPES; KEV RANGE; MINUTES LIVING RADIOISOTOPES; NUCLEAR REACTIONS; NUCLEI; NUCLEON-NUCLEON INTERACTIONS; NUCLEONS; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; PROTON-NUCLEON INTERACTIONS; RADIOISOTOPES; SECONDS LIVING RADIOISOTOPES

Optional Information

Notes
(c) 2006 The American Physical Society