Spin-isospin strength distributions for [ital fp] shell nuclei: Results for the [sup 55]Mn([ital n],[ital p]), [sup 56]Fe([ital n],[ital p]), and [sup 58]Ni([ital n],[ital p]) reactions at 198 MeV

Cross sections for the reactions [sup 55]Mn([ital n],[ital p]), [sup 56]Fe([ital n],[ital p]), and [sup 58]Ni([ital n],[ital p]) have been measured at an incident energy of 198 MeV, with protons observed over a range of energies corresponding to excitations of up to about 35 meV in the residual nucl...

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Veröffentlicht in:Physical review. C, Nuclear physics Nuclear physics, 1994-06, Vol.49:6
Hauptverfasser: El-Kateb, S., Jackson, K.P., Alford, W.P., Abegg, R., Azuma, R.E., Brown, B.A., Celler, A., Frekers, D., Haeusser, O., Helmer, R., Henderson, R.S., Hicks, K.H., Jeppesen, R., King, J.D., Shute, G.G., Spicer, B.M., Trudel, A., Raywood, K., Vetterli, M., Yen, S.
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Sprache:eng
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Zusammenfassung:Cross sections for the reactions [sup 55]Mn([ital n],[ital p]), [sup 56]Fe([ital n],[ital p]), and [sup 58]Ni([ital n],[ital p]) have been measured at an incident energy of 198 MeV, with protons observed over a range of energies corresponding to excitations of up to about 35 meV in the residual nuclei [sup 55]Cr, [sup 56]Mn, and [sup 58]Co, respectively. Measurements were carried out at center-of-mass angles between 1.6[degree] and 19.9[degree]. A multipole analysis of the results yielded the distribution of Gamow-Teller (GT) and spin-dipole strength for each target. The total GT strength below an excitation energy of 8.5 MeV was 1.7 units for [sup 55]Mn, 2.8 units for [sup 56]Fe, and 3.8 units for [sup 58]Ni. Shell model calculations of the GT strength distribution, carried out in a restricted vector space, show fair to good agreement with the data up to an excitation energy of 8.5 MeV, but overestimate the total strength by a factor of between 3 and 4.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.49.3128