Alpha-particles as probes of nuclear shape and structure effects in proton evaporation spectra

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

OSTI ID:6684135

Sarantites, D G; Nicolis, N G; Abenante, V; Majka, Z; Semkow, T M ^[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)
2. Oak Ridge National Lab., TN (USA)
3. Michigan Univ., Ann Arbor, MI (USA)

The emission barriers and subbarrier anisotropies in the alpha-particle decay with respect to the spin direction on Sn and rare earth compound nuclei are examined in the light of recent calculations incorporating deformation effects in the decay process. For the Sn systems the spectral shapes and anisotropies can be examined without involving deformation. For the rare earth systems deformation which increases with spin is necessary to explain the data. Energy spectra and angular correlations of evaporated protons from the {sup 52}Cr ({sup 34}S, 2p2n){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. These effects cannot be explained by statistical model calculations that do not include explicitly nuclear structure effects in the deexcitation process. They are interpreted as due to near-yrast stretched proton emission, which preferentially populates the yrast band by subbarrier protons.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6684135
• Report Number(s): CONF-9005255-1; ON: DE90015174; TRN: 90-025534
• Resource Relation: Conference: 25. Zakopane school of physics conference, Zakopane (Poland), 5-12 May 1990
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
NUCLEAR DEFORMATION
CHROMIUM 52 TARGET
SULFUR 34 REACTIONS
RARE EARTH ISOTOPES
TIN
ALPHA PARTICLES
ANGULAR CORRELATION
COMPOUND NUCLEI
EVAPORATION MODEL
NUCLEAR STRUCTURE
PROTON SPECTRA
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CORRELATIONS
DECAY
DEFORMATION
ELEMENTS
HEAVY ION REACTIONS
ISOTOPES
MATHEMATICAL MODELS
METALS
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEAR REACTIONS
SPECTRA
TARGETS
653001* - Nuclear Theory- Nuclear Structure
Moments
Spin
& Models