Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268

Mon., December 05, 2005, at 3:00 p.m.

Dissociation of halo nuclei and the scaling of the nuclear breakup cross section

Mahir Saleh Hussein, University of Sao Paulo, Brazil
Bldg. 6008 Conference Room

The dissociation of halo nuclei through their collisions with light and heavy targets is considered within the Continuum Discretized Coupled Channels theory. The procedure employed to extract the Coulomb dissociation cross section by subtracting the nuclear one is critically assessed, and the scaling law usually assumed for the target mass dependence of the nuclear breakup cross section is tested. We consider the one-proton halo nucleus 8B and the one-neutron halo nucleus 11Be. It is found that the nuclear breakup cross section for these very loosely bound nuclei does indeed behave as a + b* A**1/3, where a is negative, for A larger than 12 (carbon). Owing to the interference effects, however, the subtraction procedure alluded to above can only be used to calculate a theoretical error bar. Consequently, the extracted B(EL) distributions of these halo nuclei are uncertain by the size of this target-dependent error.