A study of low-multipolarity magnetic transitions in [sup 30]Si, [sup 34]S and [sup 32]S by 180[degrees] electron scattering

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1993

OSTI ID:7296040

Petraitis, M

An experiment to study the low-multipolarity magnetic transitions of [sup 30]Si, [sup 34]S and [sup 32]S by 180[degrees] inelastic electron scattering was performed at the Catholic Univ. of America 180[degrees] facility at the Univ. of Illinois microtron lab. Data were taken using a [sup 30]Si target and with both enriched Ca[sup 34]S and normal CaS targets. Two experimental data runs were conducted at a scattering angle of 180[degrees]. Incident electron beam energies of 63.3, 53.2, 42.9, and 32.8 MeV were used during the first run in March 1990, and energies of 56.5, 54.6, 45.7, 34.9 and 28.4 MeV were used during the second run in July 1990. The excitation energy region studied was from 9 MeV to 14 MeV, with the momentum transfer q ranging from 0.3 to 0.5 fm[sup [minus]1]. One forward-angle measurement was also taken for each target to distinguish longitudinal contributions from the transverse magnetic strengths under study. The cross sections were extracted for each transition at all the q values. The multipolarities and the transition strengths were determined in a model-independent analysis. A large fragmentation of M1 strength is observed in the 4N + 2 nuclei [sup 30]Si and [sup 34]S, while more concentration of the strength in fewer strong transitions is seen in the self-conjugate nucleus [sup 32]S. The experimental M1 strength distribution is found to be well predicted by configuration-mixing shell-model calculations. The sum of the transition strengths is in good agreement with recent calculations using an effective M1 operator.

• Research Organization: Catholic Univ. of America, Washington, DC (United States)
• OSTI ID: 7296040
• Country of Publication: United States
• Language: English

Related Subjects

663420* -- Lepton-Induced Reactions & Scattering-- (1992-)
663530 -- Nuclear Mass Ranges-- A=20-38-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
FERMIONS
INELASTIC SCATTERING
LEPTONS
M1-TRANSITIONS
MEV RANGE
MEV RANGE 10-100
MULTIPOLARITY
MULTIPOLE TRANSITIONS
SCATTERING
SILICON 30 TARGET
SULFUR 32 TARGET
SULFUR 34 TARGET
TARGETS