Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes

M. Guttormsen; Y. Alhassid; W. Ryssens; K.O. Ay; M. Ozgur; E. Algin; A.C. Larsen; F.L. Bello Garrote; L. Crespo Campo; T. Dahl-Jacobsen; A. Görgen; T.W. Hagen; V.W. Ingeberg; B.V. Kheswa; M. Klintefjord; J.E. Midtbø; V. Modamio; T. Renstrøm; E. Sahin; S. Siem; G.M. Tveten; F. Zeiser

Physics Letters B (May 2021)

Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes

M. Guttormsen,
Y. Alhassid,
W. Ryssens,
K.O. Ay,
M. Ozgur,
E. Algin,
A.C. Larsen,
F.L. Bello Garrote,
L. Crespo Campo,
T. Dahl-Jacobsen,
A. Görgen,
T.W. Hagen,
V.W. Ingeberg,
B.V. Kheswa,
M. Klintefjord,
J.E. Midtbø,
V. Modamio,
T. Renstrøm,
E. Sahin,
S. Siem,
G.M. Tveten,
F. Zeiser

Affiliations

M. Guttormsen: Department of Physics, University of Oslo, N-0316 Oslo, Norway; Corresponding author.
Y. Alhassid: Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, CT 06520, USA
W. Ryssens: Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, CT 06520, USA
K.O. Ay: Department of Physics, Eskisehir Osmangazi University, Faculty of Science and Letters, TR-26040 Eskisehir, Turkey
M. Ozgur: Department of Physics, Eskisehir Osmangazi University, Faculty of Science and Letters, TR-26040 Eskisehir, Turkey
E. Algin: Department of Physics, Eskisehir Osmangazi University, Faculty of Science and Letters, TR-26040 Eskisehir, Turkey; Department of Electrical and Electronics Engineering, AAT Science and Technology University, 01250 Adana, Turkey
A.C. Larsen: Department of Physics, University of Oslo, N-0316 Oslo, Norway
F.L. Bello Garrote: Department of Physics, University of Oslo, N-0316 Oslo, Norway
L. Crespo Campo: Department of Physics, University of Oslo, N-0316 Oslo, Norway
T. Dahl-Jacobsen: Department of Physics, University of Oslo, N-0316 Oslo, Norway
A. Görgen: Department of Physics, University of Oslo, N-0316 Oslo, Norway
T.W. Hagen: Department of Physics, University of Oslo, N-0316 Oslo, Norway
V.W. Ingeberg: Department of Physics, University of Oslo, N-0316 Oslo, Norway
B.V. Kheswa: Department of Physics, University of Oslo, N-0316 Oslo, Norway; Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
M. Klintefjord: Department of Physics, University of Oslo, N-0316 Oslo, Norway
J.E. Midtbø: Department of Physics, University of Oslo, N-0316 Oslo, Norway
V. Modamio: Department of Physics, University of Oslo, N-0316 Oslo, Norway
T. Renstrøm: Department of Physics, University of Oslo, N-0316 Oslo, Norway
E. Sahin: Department of Physics, University of Oslo, N-0316 Oslo, Norway
S. Siem: Department of Physics, University of Oslo, N-0316 Oslo, Norway
G.M. Tveten: Department of Physics, University of Oslo, N-0316 Oslo, Norway
F. Zeiser: Department of Physics, University of Oslo, N-0316 Oslo, Norway

Journal volume & issue: Vol. 816
p. 136206

Abstract

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Understanding the evolution of level densities in the crossover from spherical to well-deformed nuclei has been a long-standing problem in nuclear physics. We measure nuclear level densities for a chain of neodymium isotopes 142,144−151Nd which exhibit such a crossover. These results represent the most complete data set of nuclear level densities to date for an isotopic chain between neutron shell-closure and towards mid-shell. We observe a strong increase of the level densities along the chain with an overall increase by a factor of ≈150 at an excitation energy of 6 MeV and saturation around mass 150. Level densities calculated by the shell model Monte Carlo (SMMC) are in excellent agreement with these experimental results. Based on our experimental and theoretical findings, we offer an explanation of the observed mass dependence of the level densities in terms of the intrinsic single-particle level density and the collective enhancement.

Published in Physics Letters B

ISSN: 0370-2693 (Print); 1873-2445 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/physics-letters-b/

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