Alpha-particle emission as a probe of nuclear shapes and structure effects in proton evaporation spectra

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6692274

Nicolis, N G; Sarantites, D G; Abenante, V; Adler, L A; Dilmanian, F A; Majka, Z; Semkow, T M; Stracener, D W ^[1]; Baktash, C; Beene, J R; Garcia-Bermudez, G; Halbert, M L; Hensley, D C; Johnson, N R; Lee, I Y; McGowan, F K; Riley, M A; Virtanen, A ^[2]; Griffin, H C ^[3]

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1. Washington Univ., St. Louis, MO (USA). Dept. of Chemistry
2. Oak Ridge National Lab., TN (USA)
3. Michigan Univ., Ann Arbor, MI (USA). Dep

Emission barriers and subbarrier anisotropies from {alpha} decay of Sn* and Yb* compound nuclei are examined in the light of calculations incorporating deformation effects in the decay process. For the Yb* systems deformation which increases with spin is necessary to explain the data. For the Sn* systems the spectral shapes and anisotropies can be explained without deformation. For systems lighter than Sn this probe is not sensitive to the deformation. Energy spectra and angular correlations of evaporated protons from the {sup 52}Cr({sup 34}S, 2n2p){sup 82}Sr reaction were measured in coincidence with discrete transitions. Large shifts in proton spectra were observed when high spin states in different rotational bands are populated. They are interpreted as due to near-yrast stretched proton emission preferentially populating the yrast band by subbarrier protons. Simulations show that channel selected proton spectra cannot be used as probes of deformation.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/ER; JIHIR
• DOE Contract Number: AC05-84OR21400; FG02-88ER40406
• OSTI ID: 6692274
• Report Number(s): CONF-900450-9; ON: DE90015787; TRN: 90-025550
• Resource Relation: Conference: Nuclear structure in the '90's, Oak Ridge, TN (USA), 23-27 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHROMIUM 52 TARGET
SULFUR 34 REACTIONS
DEFORMED NUCLEI
PROTON SPECTRA
NEODYMIUM
ALPHA DECAY
TIN 114
YTTERBIUM ISOTOPES
ALPHA PARTICLES
ANGULAR CORRELATION
COMPOUND NUCLEI
EVAPORATION MODEL
NUCLEAR DEFORMATION
NUCLEAR STRUCTURE
YRAST STATES
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CORRELATIONS
DECAY
DEFORMATION
ELEMENTS
ENERGY LEVELS
EVEN-EVEN NUCLEI
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
METALS
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
RARE EARTH ISOTOPES
RARE EARTHS
SPECTRA
STABLE ISOTOPES
TARGETS
TIN ISOTOPES
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