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Title: Nuclear level densities and γ -ray strength functions in samarium isotopes

Abstract

The γ-strength functions and level densities in the quasicontinuum of 147,149Sm isotopes have been extracted from particle-γ coincidences using the Oslo method. The nuclei of interest were populated via (p,d) reactions on pure 148,150Sm targets and the reaction products were recorded by the Hyperion array. An upbend in the low-energy region of the γSF has been observed. The systematic analysis of the γSF for a range of Sm isotopes highlights the interplay between scissors mode and the upbend. In conclusion, shell-model calculations show reasonable agreement with the experimental γSFs and confirm the correspondence between the upbend and scissors mode.

Authors:
 [1];  [2];  [3];  [4];  [2];  [2];  [5];  [2];  [5];  [5];  [6]
  1. Univ. of Notre Dame, IN (United States); Univ. of Delhi, New Delhi (India)
  2. Univ. of Notre Dame, IN (United States)
  3. Univ. of Oslo (Norway)
  4. Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. Texas A & M Univ., College Station, TX (United States)
Publication Date:
Research Org.:
Univ. of Notre Dame, IN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1569840
Alternate Identifier(s):
OSTI ID: 1523689
Report Number(s):
LLNL-JRNL-777299
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:  
NA0003780; AC52-07NA27344; NA0002914; FG02-95ER40934; NA0003841
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 99; Journal Issue: 5; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Naqvi, F., Simon, Anna, Guttormsen, M., Schwengner, R., Frauendorf, S., Reingold, C., Burke, J. T., Cooper, N., Hughes, R. O., Ota, S., and Saastamoinen, A. Nuclear level densities and γ-ray strength functions in samarium isotopes. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.99.054331.
Naqvi, F., Simon, Anna, Guttormsen, M., Schwengner, R., Frauendorf, S., Reingold, C., Burke, J. T., Cooper, N., Hughes, R. O., Ota, S., & Saastamoinen, A. Nuclear level densities and γ-ray strength functions in samarium isotopes. United States. doi:10.1103/PhysRevC.99.054331.
Naqvi, F., Simon, Anna, Guttormsen, M., Schwengner, R., Frauendorf, S., Reingold, C., Burke, J. T., Cooper, N., Hughes, R. O., Ota, S., and Saastamoinen, A. Fri . "Nuclear level densities and γ-ray strength functions in samarium isotopes". United States. doi:10.1103/PhysRevC.99.054331.
@article{osti_1569840,
title = {Nuclear level densities and γ-ray strength functions in samarium isotopes},
author = {Naqvi, F. and Simon, Anna and Guttormsen, M. and Schwengner, R. and Frauendorf, S. and Reingold, C. and Burke, J. T. and Cooper, N. and Hughes, R. O. and Ota, S. and Saastamoinen, A.},
abstractNote = {The γ-strength functions and level densities in the quasicontinuum of 147,149Sm isotopes have been extracted from particle-γ coincidences using the Oslo method. The nuclei of interest were populated via (p,d) reactions on pure 148,150Sm targets and the reaction products were recorded by the Hyperion array. An upbend in the low-energy region of the γSF has been observed. The systematic analysis of the γSF for a range of Sm isotopes highlights the interplay between scissors mode and the upbend. In conclusion, shell-model calculations show reasonable agreement with the experimental γSFs and confirm the correspondence between the upbend and scissors mode.},
doi = {10.1103/PhysRevC.99.054331},
journal = {Physical Review C},
number = 5,
volume = 99,
place = {United States},
year = {2019},
month = {5}
}

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Works referenced in this record:

Verification of detailed balance for γ absorption and emission in Dy isotopes
journal, November 2018


Low-energy M1 excitation mode in 172Yb
journal, February 2006


Large Enhancement of Radiative Strength for Soft Transitions in the Quasicontinuum
journal, September 2004


Experimental studies of the Pygmy Dipole Resonance
journal, May 2013


Evidence for the Dipole Nature of the Low-Energy γ Enhancement in Fe 56
journal, December 2013


First observation of low-energy γ -ray enhancement in the rare-earth region
journal, March 2016


The Shell-Model Code NuShellX@MSU
journal, June 2014


Atlas of photoneutron cross sections obtained with monoenergetic photons
journal, March 1988


On superconductivity effects in nuclear level density
journal, March 1968


Photoneutron cross sections for samarium isotopes: Toward a unified understanding of ( γ , n ) and ( n , γ ) reactions in the rare earth region
journal, December 2014


Low-Energy Enhancement of Magnetic Dipole Radiation
journal, December 2013


Electric and Magnetic Dipole Strength at Low Energy
journal, July 2017


Radiative strength functions in Mo 93 98
journal, April 2005


Low-Energy Magnetic Dipole Radiation in Open-Shell Nuclei
journal, March 2017


Shell-model study of the M 1 dipole strength at low energy in the A > 100 nuclei
journal, December 2018


Improved microscopic nuclear level densities within the Hartree-Fock-Bogoliubov plus combinatorial method
journal, December 2008


Microscopic nuclear level densities for practical applications
journal, December 2001


Systematics of nuclear level density parameters
journal, October 2005


Radiative neutron captures by neutron-rich nuclei and the r-process nucleosynthesis
journal, September 1998


An Attempt to Calculate the Number of Energy Levels of a Heavy Nucleus
journal, August 1936


Gogny-HFB+QRPA dipole strength function and its application to radiative nucleon capture cross section
journal, July 2018


Statistical description of a paired nucleus with the inclusion of angular momentum
journal, April 1972


Entry-level spin distributions and relative γ -neutron branching ratios of samarium isotopes populated by the ( p , t ) reaction
journal, October 2018


Gamma decay of pygmy states from inelastic scattering of ions
journal, August 2015


Analysis of possible systematic errors in the Oslo method
journal, March 2011


Geant4—a simulation toolkit
journal, July 2003

  • Agostinelli, S.; Allison, J.; Amako, K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3
  • DOI: 10.1016/S0168-9002(03)01368-8

Consolidating the concept of low-energy magnetic dipole decay radiation
journal, December 2018


The s process: Nuclear physics, stellar models, and observations
journal, April 2011


Examination of the low-energy enhancement of the γ -ray strength function of Fe 56
journal, February 2018


Magnetic dipole excitations in nuclei: Elementary modes of nucleonic motion
journal, September 2010

  • Heyde, Kris; von Neumann-Cosel, Peter; Richter, Achim
  • Reviews of Modern Physics, Vol. 82, Issue 3
  • DOI: 10.1103/RevModPhys.82.2365

The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
journal, September 2007


The Inelastic Scattering of Neutrons
journal, July 1952


Shell-Model Combinatorial Calculations of Nuclear Level Densities
journal, September 1969


Particle-Number Reprojection in the Shell Model Monte Carlo Method: Application to Nuclear Level Densities
journal, November 1999


Large Low-Energy M 1 Strength for Fe 56 , 57 within the Nuclear Shell Model
journal, December 2014


Generalized particle-hole state densities within the equidistant spacing model
journal, March 1998


Combinatorial nuclear level densities based on the Gogny nucleon-nucleon effective interaction
journal, October 2001

  • Hilaire, S.; Delaroche, J. P.; Girod, M.
  • The European Physical Journal A, Vol. 12, Issue 2
  • DOI: 10.1007/s100500170025

The hyperion particle-γ detector array
journal, June 2017

  • Hughes, R. O.; Burke, J. T.; Casperson, R. J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 856
  • DOI: 10.1016/j.nima.2017.03.012

The first generation of γ-rays from hot nuclei
journal, April 1987

  • Guttormsen, M.; Ramsøy, T.; Rekstad, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 255, Issue 3
  • DOI: 10.1016/0168-9002(87)91221-6

Low-Energy Enhancement in the Photon Strength of Mo 95
journal, April 2012


The unfolding of continuum γ-ray spectra
journal, June 1996

  • Guttormsen, M.; Tveter, T. S.; Bergholt, L.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 374, Issue 3
  • DOI: 10.1016/0168-9002(96)00197-0