"High resolution study of the Gamow-Teller strength distribution in Sc isotopes"
László Stuhl, Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Hungary, 4026 Debrecen,
(id #76)
Seminar: YesPoster: No
Invited talk: No
The Gamow-Teller (GT) strength distributions are sensitive to changes in shell structure and study the GT strength distribution can be a tool for investigating the changes in the shell structure along an isotopic chain.
Since the extraction of GT strengths from charge exchange (CE) data is nearly model-independent, a detailed and unbiased testing of shell-model interactions is possible. In order to check the shell structure of Sc isotopes, and to discuss the spin-isospin interaction in pf-shell region, high resolution experiment was performed with the (3He,t) reaction on Ca isotopes. The experiment was carried out at the Research Center for Nuclear Physics (RCNP), Osaka University.
The energy of the 3He beam of 400 MeV was achromatically transported to the 40Ca, 42Ca, 44Ca and 48Ca targets with thicknesses of 1.63 - 1.87 mg/cm2. The typical beam intensity was 5 enA. The energy of tritons was measured with
a magnetic spectrometer using complete dispersion matching techniques. The energy resolution obtained was about 20 keV.
The spectrometer was set at 0° and 2.5° with an opening angle of ±20 mrad horizontally and ±20 mrad vertically defined by a slit at the entrance of the spectrometer.
The Jπ of the transitions were determined by comparing the angular distributions to the DWBA predictions. In this way we determined 11 new 1+, 8 new 3+ and 96 new L≥1 levels by the 40Sc, 39 new 1+, 32 new 3+ and 97 new L≥1 levels by the 42Sc, 118 new 1+, 24 new 3+ and 64 new L≥1 levels by the 44Sc and 98 new 1+, 23 new 3+ and 48 new L≥1 levels by the 48Sc.
The GT strength distribution for Sc isotopes was determined and the GT strength distribution for 48Sc was normalized in a similar way as published in Ref. [1]. The corresponding theoretical analysis of the strengths is in progress.
[1] E.-W. Grewe et al., Phys. Rev. C76 (2007) 054307
Since the extraction of GT strengths from charge exchange (CE) data is nearly model-independent, a detailed and unbiased testing of shell-model interactions is possible. In order to check the shell structure of Sc isotopes, and to discuss the spin-isospin interaction in pf-shell region, high resolution experiment was performed with the (3He,t) reaction on Ca isotopes. The experiment was carried out at the Research Center for Nuclear Physics (RCNP), Osaka University.
The energy of the 3He beam of 400 MeV was achromatically transported to the 40Ca, 42Ca, 44Ca and 48Ca targets with thicknesses of 1.63 - 1.87 mg/cm2. The typical beam intensity was 5 enA. The energy of tritons was measured with
a magnetic spectrometer using complete dispersion matching techniques. The energy resolution obtained was about 20 keV.
The spectrometer was set at 0° and 2.5° with an opening angle of ±20 mrad horizontally and ±20 mrad vertically defined by a slit at the entrance of the spectrometer.
The Jπ of the transitions were determined by comparing the angular distributions to the DWBA predictions. In this way we determined 11 new 1+, 8 new 3+ and 96 new L≥1 levels by the 40Sc, 39 new 1+, 32 new 3+ and 97 new L≥1 levels by the 42Sc, 118 new 1+, 24 new 3+ and 64 new L≥1 levels by the 44Sc and 98 new 1+, 23 new 3+ and 48 new L≥1 levels by the 48Sc.
The GT strength distribution for Sc isotopes was determined and the GT strength distribution for 48Sc was normalized in a similar way as published in Ref. [1]. The corresponding theoretical analysis of the strengths is in progress.
[1] E.-W. Grewe et al., Phys. Rev. C76 (2007) 054307
