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Title: Rotational structures and their evolution with spin in {sup 152}Gd.

Abstract

The fusion-evaporation reaction involving a 175 MeV {sup 36}S beam and a {sup 124}Sn target was performed, and the emitted {gamma} rays were observed with the Gammasphere spectrometer. Significant additions to the level scheme of {sup 152}Gd were made in spite of the relative weakness of the {alpha}4n exit channel, being only {approx}2% of the total fusion cross-section. The high-spin behavior of {sup 152}Gd was compared with that of other N=88 nuclei. A striking similarity was observed with {sup 154}Dy and it is therefore suggested that the angular-momentum-induced shape changes that take place in {sup 154}Dy also occur in {sup 152}Gd in the 30--40{h_bar} spin range. This is supported by Cranked Nilsson-Strutinsky calculations which were used to interpret the high-spin bands. It is found that a better agreement between calculation and experiment is obtained if the Z=64 shell gap increases with a decreasing number of valence particles outside the doubly-closed {sub 64}{sup 146}Gd82 nucleus.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); NSF-Florida; UK Engineering and Physical Science Research Council; Swedish Science Research Council
OSTI Identifier:
914961
Report Number(s):
ANL/PHY/JA-58683
Journal ID: ISSN 0556-2813; PRVCAN; TRN: US200817%%36
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. C; Journal Volume: 75; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; MEV RANGE 100-1000; SPIN; DYSPROSIUM 154; GADOLINIUM 152; TIN 124 TARGET; SULFUR 36 REACTIONS; GAMMA RADIATION; HIGH SPIN STATES

Citation Formats

Campbell, D. B., Laird, R. W., Riley, M. A., Simpson, J., Kondev, F. G., Hartley, D. J., Janssens, R. V. F., Brown, T. B., Carpenter, M. P., Fallon, P., Fischer, S. M., Lauritsen, T., Nisius, D., Ragnarsson, I., LLNL, Texas Lutheran Univ., Florida State Univ., Daresbury Lab., U.S. Naval Academy, SRL, LBNL., DePaul Univ., and Lund Univ. Rotational structures and their evolution with spin in {sup 152}Gd.. United States: N. p., 2007. Web. doi:10.1103/PhysRevC.75.064314.
Campbell, D. B., Laird, R. W., Riley, M. A., Simpson, J., Kondev, F. G., Hartley, D. J., Janssens, R. V. F., Brown, T. B., Carpenter, M. P., Fallon, P., Fischer, S. M., Lauritsen, T., Nisius, D., Ragnarsson, I., LLNL, Texas Lutheran Univ., Florida State Univ., Daresbury Lab., U.S. Naval Academy, SRL, LBNL., DePaul Univ., & Lund Univ. Rotational structures and their evolution with spin in {sup 152}Gd.. United States. doi:10.1103/PhysRevC.75.064314.
Campbell, D. B., Laird, R. W., Riley, M. A., Simpson, J., Kondev, F. G., Hartley, D. J., Janssens, R. V. F., Brown, T. B., Carpenter, M. P., Fallon, P., Fischer, S. M., Lauritsen, T., Nisius, D., Ragnarsson, I., LLNL, Texas Lutheran Univ., Florida State Univ., Daresbury Lab., U.S. Naval Academy, SRL, LBNL., DePaul Univ., and Lund Univ. Mon . "Rotational structures and their evolution with spin in {sup 152}Gd.". United States. doi:10.1103/PhysRevC.75.064314.
@article{osti_914961,
title = {Rotational structures and their evolution with spin in {sup 152}Gd.},
author = {Campbell, D. B. and Laird, R. W. and Riley, M. A. and Simpson, J. and Kondev, F. G. and Hartley, D. J. and Janssens, R. V. F. and Brown, T. B. and Carpenter, M. P. and Fallon, P. and Fischer, S. M. and Lauritsen, T. and Nisius, D. and Ragnarsson, I. and LLNL and Texas Lutheran Univ. and Florida State Univ. and Daresbury Lab. and U.S. Naval Academy and SRL and LBNL. and DePaul Univ. and Lund Univ.},
abstractNote = {The fusion-evaporation reaction involving a 175 MeV {sup 36}S beam and a {sup 124}Sn target was performed, and the emitted {gamma} rays were observed with the Gammasphere spectrometer. Significant additions to the level scheme of {sup 152}Gd were made in spite of the relative weakness of the {alpha}4n exit channel, being only {approx}2% of the total fusion cross-section. The high-spin behavior of {sup 152}Gd was compared with that of other N=88 nuclei. A striking similarity was observed with {sup 154}Dy and it is therefore suggested that the angular-momentum-induced shape changes that take place in {sup 154}Dy also occur in {sup 152}Gd in the 30--40{h_bar} spin range. This is supported by Cranked Nilsson-Strutinsky calculations which were used to interpret the high-spin bands. It is found that a better agreement between calculation and experiment is obtained if the Z=64 shell gap increases with a decreasing number of valence particles outside the doubly-closed {sub 64}{sup 146}Gd82 nucleus.},
doi = {10.1103/PhysRevC.75.064314},
journal = {Phys. Rev. C},
number = 2007,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}