Spin decomposition of the responses of Ca-44 and Ca-48 to 300 MeV protons

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Phys. Rev. C

DOI:https://doi.org/10.1103/PhysRevC.44.93· OSTI ID:918878

Baker, F T; Bimbot, L; Fergerson, R W; Glashausser, C; Green, A; Hausser, O; Hicks, K; Jones, K; Miller, C A; Vetterli, M; Abegg, R; Beatty, D; Bonin, B; Castel, B; Chen, X Y; Cupps, V; Djalali, C; Henderson, R; Jackson, K P; Jeppesen, R ; Nakayama, K; Nanda, S K; Sawafta, R; Yen, S

Angular distributions of the double-differential cross section d2σ/dΩ dE(σ) and the spin-flip probability Snn have been measured for inclusive proton inelastic scattering from 44Ca at 290 MeV and from 48Ca at 318 MeV. Excitation energies up to about 50 MeV for 44Ca and 40 MeV for 48Ca have been investigated over the laboratory angular ranges of 3° to 12° for 44Ca and 3° to 9° for 48Ca. Multipole decompositions of angular distributions of both the spin-flip cross section σSnn and the estimated cross section for ΔS=0 transitions have been performed. Distributions of strengths were deduced for ΔL=1, ΔS=0 (the giant dipole), ΔL=2, ΔS=0 (the giant quadrupole), ΔL=0, ΔS=1 (the magnetic dipole), ΔL=1, ΔS=1 (the spin dipole), and ΔL=2, ΔS=1 (the spin quadrupole). The ΔS=0 summed strengths for 44Ca are lower than for 40Ca and 48Ca. The spin-dipole summed strengths are found to be approximately independent of A. For 48Ca, essentially all M1 strength observed was in the 10.23 MeV 1+ state; for 44Ca, M1 strength was observed to be fragmented over a range of 7 to 18 Mev.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA
• Sponsoring Organization: USDOE - Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 918878
• Report Number(s): CEBAF-PR-91-61; DOE/ER/40150-4382
• Journal Information: Phys. Rev. C, Journal Name: Phys. Rev. C Vol. 44; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
CALCIUM ISOTOPES
CROSS SECTIONS
EXCITATION
INELASTIC SCATTERING
MULTIPOLES
PROBABILITY
PROTONS
SPIN
SPIN FLIP