Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 24: Nuclear Physics / Spectroscopy III
HK 24.4: Vortrag
Mittwoch, 13. März 2002, 12:00–12:15, B
Gamow-Teller matrix elements from the (d,2He) reaction at 170 MeV — •S. Rakers, C. Bäumer, D. Frekers, E. Grewe, B. Junk, and R. Schmidt — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 9, D-48149 Münster
The (d,2He) reaction, where 2He denotes the unbound system of two protons being in a 1S0 state, is a charge-exchange reaction of (n→,p→) type. At extreme forward angles, the probe excites Gamow-Teller states with high purity.
We have performed (d,2He) experiments on the N=Z nuclei 12C and 24Mg at Ed=170 MeV. The protons from the 2He decay were detected in coincidence with the BBS-ESN spectrometer/detector setup at the AGOR cyclotron in Groningen. Energy resolutions of 145 keV were achieved, allowing a detailed spectroscopy of the final nuclei 12B and 24Na.
In the talk, we will present spectra, angular distributions, and DWBA calculations. In the case of the 24Mg, the 0∘ spectrum is compared with (p,n) reaction data in which the same levels in the analog nucleus 24Al are populated. A detailed one-to-one correspondence is observed. Spectra can also be compared with (p,p′) data, yielding a complete level scheme for 1+ states in the A=24 (T=1) isospin triplet.