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

doi:10.1016/j.physletb.2021.136206

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. SiemG. M. Tveten, F. Zeiser

Physics

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11 Citations (Scopus)

Abstract

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 ^{142,144−151}Nd 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.

Original language	English
Article number	136206
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	816
DOIs	https://doi.org/10.1016/j.physletb.2021.136206
Publication status	Published - 10 May 2021

Keywords

Collective enhancement
Mean-field theory
Nuclear level density
Oslo method
Shell model Monte Carlo

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2021.136206

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Guttormsen, M., Alhassid, Y., Ryssens, W., Ay, K. O., Ozgur, M., Algin, E., Larsen, A. C., Bello Garrote, F. L., Crespo Campo, L., Dahl-Jacobsen, T., Görgen, A., Hagen, T. W., Ingeberg, V. W., Kheswa, B. V., Klintefjord, M., Midtbø, J. E., Modamio, V., Renstrøm, T., Sahin, E., ... Zeiser, F. (2021). Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 816, Article 136206. https://doi.org/10.1016/j.physletb.2021.136206

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title = "Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes",

abstract = "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.",

keywords = "Collective enhancement, Mean-field theory, Nuclear level density, Oslo method, Shell model Monte Carlo",

author = "M. Guttormsen and Y. Alhassid and W. Ryssens and Ay, {K. O.} and M. Ozgur and E. Algin and Larsen, {A. C.} and {Bello Garrote}, {F. L.} and {Crespo Campo}, L. and T. Dahl-Jacobsen and A. G{\"o}rgen and Hagen, {T. W.} and Ingeberg, {V. W.} and Kheswa, {B. V.} and M. Klintefjord and Midtb{\o}, {J. E.} and V. Modamio and T. Renstr{\o}m and E. Sahin and S. Siem and Tveten, {G. M.} and F. Zeiser",

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year = "2021",

month = may,

day = "10",

doi = "10.1016/j.physletb.2021.136206",

language = "English",

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Guttormsen, M, Alhassid, Y, Ryssens, W, Ay, KO, Ozgur, M, Algin, E, Larsen, AC, Bello Garrote, FL, Crespo Campo, L, Dahl-Jacobsen, T, Görgen, A, Hagen, TW, Ingeberg, VW, Kheswa, BV, Klintefjord, M, Midtbø, JE, Modamio, V, Renstrøm, T, Sahin, E, Siem, S, Tveten, GM & Zeiser, F 2021, 'Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 816, 136206. https://doi.org/10.1016/j.physletb.2021.136206

TY - JOUR

T1 - Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes

AU - Guttormsen, M.

AU - Alhassid, Y.

AU - Ryssens, W.

AU - Ay, K. O.

AU - Ozgur, M.

AU - Algin, E.

AU - Larsen, A. C.

AU - Bello Garrote, F. L.

AU - Crespo Campo, L.

AU - Dahl-Jacobsen, T.

AU - Görgen, A.

AU - Hagen, T. W.

AU - Ingeberg, V. W.

AU - Kheswa, B. V.

AU - Klintefjord, M.

AU - Midtbø, J. E.

AU - Modamio, V.

AU - Renstrøm, T.

AU - Sahin, E.

AU - Siem, S.

AU - Tveten, G. M.

AU - Zeiser, F.

PY - 2021/5/10

Y1 - 2021/5/10

N2 - 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.

AB - 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.

KW - Collective enhancement

KW - Mean-field theory

KW - Nuclear level density

KW - Oslo method

KW - Shell model Monte Carlo

UR - http://www.scopus.com/inward/record.url?scp=85102996965&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2021.136206

DO - 10.1016/j.physletb.2021.136206

M3 - Article

AN - SCOPUS:85102996965

SN - 0370-2693

VL - 816

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 136206

ER -

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

Abstract

Keywords

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