Excitation of giant resonances in the [sup 40]Ca([ital e],[ital e][prime][ital n])[sup 39]Ca reaction

Journal Article · Mon Aug 01 00:00:00 EDT 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.50.845· OSTI ID:7015091

Takakuwa, C; Saito, T; Suzuki, S; Takahisa, K ^[1]; Tohei, T; Nakagawa, T ^[2]; Abe, K ^[3]

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1. Laboratory of Nuclear Science, Tohoku University, Mikamine, Taihakuku, Sendai 982 (Japan)
2. Department of Physics, Tohoku University, Aramaki, Aobaku, Sendai 980 (Japan)
3. Department of Nuclear Engineering, Tohoku University, Aramaki, Aobaku, Sendai 980 (Japan)

Decay neutrons from the [sup 40]Ca([ital e],[ital e][prime][ital n])[sup 39]Ca reaction were studied in the giant resonance region. The cross sections and angular distributions, separated for [ital n][sub 0] and [ital n][sub 1] decays, were obtained for excitation energies between 19 and 27 MeV, at the effective momentum transfer of 0.35 fm[sup [minus]1]. Legendre polynomial coefficients obtained from fitting the data are compared with those from the ([ital e],[ital e][prime][ital p]) reaction. In the energy range 19--21 MeV, the interference coefficients [ital b][sub 1] and [ital b][sub 3] for the ground state transition are in agreement, but the noninterference coefficient [ital b][sub 2] is different. The different behavior of the angular distribution for protons and neutrons may suggest the interference of the decay from a [ital T]=0 quadrupole resonance and the [ital T]=1 giant dipole resonance. A similar tendency was also seen in comparing with the ([ital e],[ital e][prime][ital p][sub 1]) reaction. The Legendre polynomial coefficients for the [ital n][sub 0] decay in the ([ital e],[ital e][prime][ital n]) reaction, transformed to the photon point, agree well with those of the ([gamma],[ital n][sub 0]) reaction. The reduced total cross section is consistent between the ([ital e],[ital e][prime][ital n]) and ([gamma],[ital n]) reactions, but the cross section for ([ital e],[ital e][prime][ital n][sub 0]) is larger than that of ([gamma],[ital n][sub 0]) near the peak of the resonance. The values of the longitudinal-transverse interference term are close to zero in the present region, which is rather small compared with the value near the resonance of the ([ital e],[ital e][prime][ital p]) reaction.

• OSTI ID: 7015091
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 50:2; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CALCIUM 40 TARGET
ELECTRON REACTIONS
NEUTRONS
DIFFERENTIAL CROSS SECTIONS
ANGULAR DISTRIBUTION
CALCIUM 39
GIANT RESONANCE
INELASTIC SCATTERING
MEV RANGE 10-100
MOMENTUM TRANSFER
ALKALINE EARTH ISOTOPES
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CALCIUM ISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
EVEN-ODD NUCLEI
FERMIONS
HADRONS
ISOTOPES
LEPTON REACTIONS
LIGHT NUCLEI
MEV RANGE
MILLISEC LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
RADIOISOTOPES
RESONANCE
SCATTERING
SECONDS LIVING RADIOISOTOPES
TARGETS
663420* - Lepton-Induced Reactions & Scattering- (1992-)
663540 - Nuclear Mass Ranges- A=39-58- (1992-)