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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 E_d=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.