Emission temperatures from the decay of particle unstable complex nuclei

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.132· OSTI ID:5105652

Nayak, T K; Murakami, T; Lynch, W G; Swartz, K; Fields, D J; Gelbke, C K; Kim, Y D; Pochodzalla, J; Tsang, M B; Xu, H M; Zhu, F ^[1]; Kwiatkowski, K ^[2]

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1. National Superconducting Cyclotron Laboratory and Department of Physics,p Michigan State University, East Lansing, Michigan 48824 (United States)
2. Department of Chemistry and Indiana University Cyclotron Facility, Indiana University, Bloomington, Indiana 47405 (United States)

The relative populations of particle-unstable states of intermediate-mass fragments were measured for the {sup 14}N+Ag reaction at {ital E}/{ital A}=35 MeV with a position-sensitive hodoscope. These measurements were compared to the predictions of statistical calculations which include the sequential decay of heavier particle unstable nuclei. The best overall agreement between the calculated and measured excited-state populations was obtained with calculations which assume emission temperatures of about 3--4 MeV for the primary distributions of the particle unstable intermediate-mass fragments. However, a detailed comparison between calculated and measured excited state populations assuming {ital T}{sub em}=4 MeV reveals significant discrepancies for about one-third to one-half of the measured quantities. Calculations that include rotational effects do not satisfactorily account for this discrepancy. These results suggest the possibility of a breakdown in the assumption of local thermal equilibrium at freezeout.

• OSTI ID: 5105652
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:1; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663560 -- Nuclear Mass Ranges-- A=90-149-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
DATA
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EXPERIMENTAL DATA
HEAVY ION REACTIONS
HIGH SPIN STATES
INFORMATION
MASS SPECTRA
MATHEMATICAL MODELS
METALS
MEV RANGE
MEV RANGE 100-1000
NITROGEN 14 REACTIONS
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUMERICAL DATA
PHYSICAL PROPERTIES
SILVER
SPECTRA
STATISTICAL MODELS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS