Nuclear structure effects at high spin and excitation from proton spectra using total spectroscopy
- Washington Univ., St. Louis, MO (United States)
The origin of the previously observed nuclear structure effects on the proton evaporation spectra that populate high spin states in different rotational bands of {sup 82}Sr, produced by the ({sup 34}S, 2p2n) and ({sup 24}Mg, 2p2n) reactions, has been investigated further via the {sup 58}Ni({sup 28}Si, 4p) reaction at 130 MeV. A new approach termed {open_quotes}total spectroscopy{close_quotes} has been employed, whereby all charged particles and {gamma}-rays were detected event-by-event. The authors find significant shifts in the entry state populations leading to {sup 82}Sr when high spin states in different rotational bands are populated. In turn these are reflected in differences in the proton energy spectra. These shifts are clearly seen magnified when energy-ordered proton spectra are constructed. Statistical model calculations that do not explicitly include nuclear structure effects cannot explain the data. The persistence of these effects indicates that band mixing in the {open_quotes}structural{close_quotes} entry region (defined after particle and statistical {gamma} emission) may not be very strong in this nucleus. Consequently, a fractionation of the primary entry state population when the yrast and ground bands are fed at I=14, may be responsible for observed shifts in the entry regions associated with these two bands.
- OSTI ID:
- 141205
- Report Number(s):
- CONF-930304-; TRN: 93:003688-0881
- Resource Relation:
- Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of 205th ACS national meeting; PB: 1951 p.
- Country of Publication:
- United States
- Language:
- English
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Nuclear structure effects in entry state population using {open_quotes}total spectroscopy{close_quotes} of {sup 58}Ni({sup 28}Si,4p) {sup 82}Sr at 130 MeV