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

Abstract

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.

Authors:
; ; ; ;  [1]; ; ; ; ; ; ; ; ; ;  [2];  [3]
  1. Washington Univ., St. Louis, MO (USA)
  2. Oak Ridge National Lab., TN (USA)
  3. Michigan Univ., Ann Arbor, MI (USA)
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
Sponsoring Org.:
DOE/ER
OSTI Identifier:
6684135
Report Number(s):
CONF-9005255-1
ON: DE90015174; TRN: 90-025534
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Conference
Resource Relation:
Conference: 25. Zakopane school of physics conference, Zakopane (Poland), 5-12 May 1990
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Sarantites, D G, Nicolis, N G, Abenante, V, Majka, Z, Semkow, T M, 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, and Griffin, H C. Alpha-particles as probes of nuclear shape and structure effects in proton evaporation spectra. United States: N. p., 1990. Web.
Sarantites, D G, Nicolis, N G, Abenante, V, Majka, Z, Semkow, T M, 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, & Griffin, H C. Alpha-particles as probes of nuclear shape and structure effects in proton evaporation spectra. United States.
Sarantites, D G, Nicolis, N G, Abenante, V, Majka, Z, Semkow, T M, 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, and Griffin, H C. 1990. "Alpha-particles as probes of nuclear shape and structure effects in proton evaporation spectra". United States. https://www.osti.gov/servlets/purl/6684135.
@article{osti_6684135,
title = {Alpha-particles as probes of nuclear shape and structure effects in proton evaporation spectra},
author = {Sarantites, D G and Nicolis, N G and Abenante, V and Majka, Z and Semkow, T M and Baktash, C and Beene, J R and Garcia-Bermudez, G and Halbert, M L and Hensley, D C and Johnson, N R and Lee, I Y and McGowan, F K and Riley, M A and Virtanen, A and Griffin, H C},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6684135}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1990},
month = {Mon Jan 01 00:00:00 EST 1990}
}

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