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Title: Selective population of states in fission fragments from the [sup 32]S+[sup 24]Mg reaction

Abstract

The symmetric and near-symmetric mass fission yields from the [sup 32]S+[sup 24]Mg reaction have been studied in a particle-particle-[gamma] coincidence measurement. Evidence is presented for a selective population of states in [sup 28]Si fragments arising from the symmetric fission of the [sup 56]Ni compound nucleus. A statistical-model calculation of the expected strength to specific mutual excitations of the fission fragments is presented and compared to the experimental results. This calculation is found to describe the structures observed at high excitation energy in the fission [ital Q]-value spectra quite well. Analysis of the [gamma]-ray spectra indicates, however, that a specific set of states in [sup 28]Si, corresponding to a highly deformed prolate band, is populated more strongly than expected based on a purely spin-weighted, statistical decay of the compound nucleus. It is suggested that the population pattern of states in the fission fragments may reflect nuclear structure effects at the point of scission.

Authors:
; ;  [1]; ; ; ; ; ; ; ; ; ;  [2];  [3];  [4]
  1. The University of Kansas, Department of Physics and Astronomy, Lawrence, Kansas 66045 (United States)
  2. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  3. University of Notre Dame, Department of Physics, Notre Dame, Indiana 46556 (United States)
  4. Purdue University, Lafayette, Indiana 47907 (United States)
Publication Date:
OSTI Identifier:
5261725
DOE Contract Number:  
FG02-89ER40506; W-31109-ENG-38
Resource Type:
Journal Article
Journal Name:
Physical Review, C (Nuclear Physics); (United States)
Additional Journal Information:
Journal Volume: 49:2; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; MAGNESIUM 24 TARGET; SULFUR 32 REACTIONS; NICKEL 56; FISSION; COMPOUND-NUCLEUS REACTIONS; FISSION YIELD; GAMMA SPECTRA; NUCLEAR DEFORMATION; SILICON 28; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CHARGED-PARTICLE REACTIONS; DAYS LIVING RADIOISOTOPES; DEFORMATION; ELECTRON CAPTURE RADIOISOTOPES; EVEN-EVEN NUCLEI; HEAVY ION REACTIONS; INTERMEDIATE MASS NUCLEI; ISOTOPES; LIGHT NUCLEI; NICKEL ISOTOPES; NUCLEAR REACTION YIELD; NUCLEAR REACTIONS; NUCLEI; RADIOISOTOPES; SILICON ISOTOPES; SPECTRA; STABLE ISOTOPES; TARGETS; YIELDS; 663450* - Heavy-Ion-Induced Reactions & Scattering- (1992-); 663300 - Nuclear Reactions & Scattering, General- (1992-)

Citation Formats

Sanders, S J, Hasan, A, Prosser, F W, Back, B B, Betts, R R, Carpenter, M P, Henderson, D J, Janssens, R V.F., Khoo, T L, Moore, E F, Wilt, P R, Wolfs, F L.H., Wuosmaa, A H, Beard, K B, and Benet, P. Selective population of states in fission fragments from the [sup 32]S+[sup 24]Mg reaction. United States: N. p., 1994. Web. doi:10.1103/PhysRevC.49.1016.
Sanders, S J, Hasan, A, Prosser, F W, Back, B B, Betts, R R, Carpenter, M P, Henderson, D J, Janssens, R V.F., Khoo, T L, Moore, E F, Wilt, P R, Wolfs, F L.H., Wuosmaa, A H, Beard, K B, & Benet, P. Selective population of states in fission fragments from the [sup 32]S+[sup 24]Mg reaction. United States. https://doi.org/10.1103/PhysRevC.49.1016
Sanders, S J, Hasan, A, Prosser, F W, Back, B B, Betts, R R, Carpenter, M P, Henderson, D J, Janssens, R V.F., Khoo, T L, Moore, E F, Wilt, P R, Wolfs, F L.H., Wuosmaa, A H, Beard, K B, and Benet, P. 1994. "Selective population of states in fission fragments from the [sup 32]S+[sup 24]Mg reaction". United States. https://doi.org/10.1103/PhysRevC.49.1016.
@article{osti_5261725,
title = {Selective population of states in fission fragments from the [sup 32]S+[sup 24]Mg reaction},
author = {Sanders, S J and Hasan, A and Prosser, F W and Back, B B and Betts, R R and Carpenter, M P and Henderson, D J and Janssens, R V.F. and Khoo, T L and Moore, E F and Wilt, P R and Wolfs, F L.H. and Wuosmaa, A H and Beard, K B and Benet, P},
abstractNote = {The symmetric and near-symmetric mass fission yields from the [sup 32]S+[sup 24]Mg reaction have been studied in a particle-particle-[gamma] coincidence measurement. Evidence is presented for a selective population of states in [sup 28]Si fragments arising from the symmetric fission of the [sup 56]Ni compound nucleus. A statistical-model calculation of the expected strength to specific mutual excitations of the fission fragments is presented and compared to the experimental results. This calculation is found to describe the structures observed at high excitation energy in the fission [ital Q]-value spectra quite well. Analysis of the [gamma]-ray spectra indicates, however, that a specific set of states in [sup 28]Si, corresponding to a highly deformed prolate band, is populated more strongly than expected based on a purely spin-weighted, statistical decay of the compound nucleus. It is suggested that the population pattern of states in the fission fragments may reflect nuclear structure effects at the point of scission.},
doi = {10.1103/PhysRevC.49.1016},
url = {https://www.osti.gov/biblio/5261725}, journal = {Physical Review, C (Nuclear Physics); (United States)},
issn = {0556-2813},
number = ,
volume = 49:2,
place = {United States},
year = {Tue Feb 01 00:00:00 EST 1994},
month = {Tue Feb 01 00:00:00 EST 1994}
}