INDICATION OF N-P INTERACTION FOR NUCLEAR LEVELS OBSERVED AT HIGH EXCITATION ENERGY
Neutron resonance data are utilized to study properties of highly excited states in nuclei. A level density systematics of compound resonances for a large number of nuclei of different even-odd character is used. The interpretation of the rather complicated structure in the systematics is that there is a step shaped base line for the level density parameter formed by nuclei with minimal effects from residual interaction and no shell effects**1 (Fig. 1). Deviations of the level density parameter from the base line are interpreted as the effect of sort range forces. The assumption that the ground state pairing energy is changed at high excitation energy failed for nuclei in the neighbourhood of A +- 105, where the deviation of the observed level density parameter from the base line increases with the atomic number, i.e. the residual interaction decreases with increasing odd number of neutrons. On the other hand this deviation from the base line is anti- correlated with the energy of the lowest 2**+ state for nuclei with one neutron less (even-even nuclei) and the level desity parameter approaches close to the base line if we assume that there is no effective residual interaction. All these facts are explained by means of n-p interactions in this nuclei.
Bibliographic Reference: INTERNATIONAL CONFERENCE "NUCLEAR PHYSICS", FIRENZE (ITALY), AUG. 29-SEPT. 3, 1983. AVAILABILITY: CEC LUXEMBOURG, DG XIII/A2 MENTIONING PAPER E 31120 ORA
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Record Number: 1989122007200 / Last updated on: 1987-01-01
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