Investigation of low-lying electric dipole strength in the semimagic nucleus {sup 44}Ca

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.034304· OSTI ID:21499473

Isaak, J; Fritzsche, M; Hartmann, T; Pietralla, N; Romig, C; Sonnabend, K ^[1]; Savran, D ^[2]; Galaviz, D ^[3]; Kamerdzhiev, S ^[4]; Kelley, J H ^[5]; Kwan, E; Rusev, G; Tonchev, A P; Tornow, W ^[6]; Zilges, A ^[7]

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1. Institut fuer Kernphysik, Technische Universitaet Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt (Germany)
2. ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, Planckstrasse 1, D-64291 Darmstadt (Germany)
3. Centro de Fisica Nuclear, University of Lisbon, P-1649-003 Lisbon (Portugal)
4. Institut fuer Kernphysik, Forschungszentrum Juelich, D-52425 Juelich (Germany)
5. Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202 (United States)
6. Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708 (United States)
7. Institut fuer Kernphysik, Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Koeln (Germany)

The dipole-strength distribution in the semimagic nucleus {sup 44}Ca has been measured up to 10 MeV excitation energy in photon-scattering experiments using bremsstrahlung and monoenergetic 100% linearly polarized photon beams. The combination of both measurements allows a clear determination of spin and parity quantum numbers of the excited states as well as absolute cross sections and transition probabilities. The results show that the majority of the dipole strength in {sup 44}Ca below 10 MeV is due to E1 transitions while M1 strength plays only a minor role. The experimental results are compared to the strength in the neighboring doubly magic nuclei {sup 40,48}Ca and to microscopic calculations within the extended theory of finite Fermi systems in order to investigate the evolution of the low-lying E1 strength in this isotopic chain. Both, experiment and calculations, show a nontrivial dependence of the total E1 strength as a function of the neutron number.

• OSTI ID: 21499473
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevC.83.034304; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BREMSSTRAHLUNG
CALCIUM 40
CALCIUM 44
CALCIUM 48
COMPUTERIZED SIMULATION
CROSS SECTIONS
E1-TRANSITIONS
ELECTRIC DIPOLES
EXCITATION
EXCITED STATES
M1-TRANSITIONS
MAGIC NUCLEI
MEV RANGE 01-10
NEUTRONS
PARITY
PHOTON BEAMS
QUANTUM NUMBERS
SCATTERING
SPIN
ALKALINE EARTH ISOTOPES
ANGULAR MOMENTUM
BARYONS
BEAMS
CALCIUM ISOTOPES
DIPOLES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
FERMIONS
HADRONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LIGHT NUCLEI
MEV RANGE
MULTIPOLE TRANSITIONS
MULTIPOLES
NUCLEI
NUCLEONS
PARTICLE PROPERTIES
RADIATIONS
SIMULATION
STABLE ISOTOPES