skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on May 29, 2020

Title: Nuclear level densities and γ -ray strength functions of Ta 180 , 181 , 182

Abstract

Particle-$γ$ coincidence experiments were performed at the Oslo Cyclotron Laboratory with the 181Ta($d, X$) and 181Ta(3He, $X$) reactions to measure the nuclear level densities (NLDs) and $γ$-ray strength functions ($γ$SFs) of 180,181,182Ta using the Oslo method. The back-shifted Fermi-gas, constant temperature plus Fermi gas, and Hartree-Fock-Bogoliubov plus combinatorial models were used for the absolute normalizations of the experimental NLDs at the neutron separation energies. The NLDs and $γ$ SFs are used to calculate the corresponding 181Ta($n, γ$) cross sections and these are compared to results from other techniques. The energy region of the scissors resonance strength is investigated and from the data and comparison to prior work it is concluded that the scissors strength splits into two distinct parts. This splitting may allow for the determination of triaxiality and a $γ$ deformation of 14.9° ± 1.8° was determined for 181Ta.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [6];  [6];  [9];  [9];  [10];  [9];  [11];  [9];  [9];  [1];  [1];  [10] more »;  [11];  [9];  [9];  [9];  [9];  [9];  [9] « less
  1. iThemba LABS, Somerset West (South Africa). Dept. of Subatomic Physics; Stellenbosch Univ., Matieland (South Africa). Physics Dept.
  2. iThemba LABS, Somerset West (South Africa). Dept. of Subatomic Physics; Stellenbosch Univ., Matieland (South Africa). Physics Dept.; Univ. of Western Cape, Bellville (South Africa). Physics Dept.
  3. iThemba LABS, Somerset West (South Africa). Dept. of Subatomic Physics
  4. iThemba LABS, Somerset West (South Africa). Dept. of Subatomic Physics; Univ. of Johannesburg, Doornfontein (South Africa). Dept. of Applied Physics and Engineering Mathematics
  5. Univ. Libre de Bruxelles, Brussels (Belgium). Inst. d'Astronomie et d'Astrophysique
  6. Univ. of Oslo, Oslo (Norway). Dept. of Physics
  7. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  8. Univ. of Oslo, Oslo (Norway). Dept. of Physics; Helmholtz Inst. Mainz, Mainz (Germany); GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany)
  9. Univ. of Olso, Oslso (Norway). Dept. of Physics
  10. Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA), Arpajon (France). Direction des Applications Militaires Île-de-France (DAM DIF)
  11. Shandong Univ., Weihai (China). Inst. of Space Sciences
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1561458
Alternate Identifier(s):
OSTI ID: 1523317
Report Number(s):
LLNL-JRNL-766442
Journal ID: ISSN 2469-9985; 951607
Grant/Contract Number:  
AC52-07NA27344
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

Brits, C. P., Malatji, K. L., Wiedeking, M., Kheswa, B. V., Goriely, S., Garrote, F. L. Bello, Bleuel, D. L., Giacoppo, F., Görgen, A., Guttormsen, M., Hadynska-Klek, K., Hagen, T. W., Hilaire, S., Ingeberg, V. W., Jia, H., Klintefjord, M., Larsen, A. C., Majola, S. N. T., Papka, P., Péru, S., Qi, B., Renstrøm, T., Rose, S. J., Sahin, E., Siem, S., Tveten, G. M., and Zeiser, F. Nuclear level densities and γ -ray strength functions of Ta180,181,182. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.99.054330.
Brits, C. P., Malatji, K. L., Wiedeking, M., Kheswa, B. V., Goriely, S., Garrote, F. L. Bello, Bleuel, D. L., Giacoppo, F., Görgen, A., Guttormsen, M., Hadynska-Klek, K., Hagen, T. W., Hilaire, S., Ingeberg, V. W., Jia, H., Klintefjord, M., Larsen, A. C., Majola, S. N. T., Papka, P., Péru, S., Qi, B., Renstrøm, T., Rose, S. J., Sahin, E., Siem, S., Tveten, G. M., & Zeiser, F. Nuclear level densities and γ -ray strength functions of Ta180,181,182. United States. doi:10.1103/PhysRevC.99.054330.
Brits, C. P., Malatji, K. L., Wiedeking, M., Kheswa, B. V., Goriely, S., Garrote, F. L. Bello, Bleuel, D. L., Giacoppo, F., Görgen, A., Guttormsen, M., Hadynska-Klek, K., Hagen, T. W., Hilaire, S., Ingeberg, V. W., Jia, H., Klintefjord, M., Larsen, A. C., Majola, S. N. T., Papka, P., Péru, S., Qi, B., Renstrøm, T., Rose, S. J., Sahin, E., Siem, S., Tveten, G. M., and Zeiser, F. Wed . "Nuclear level densities and γ -ray strength functions of Ta180,181,182". United States. doi:10.1103/PhysRevC.99.054330.
@article{osti_1561458,
title = {Nuclear level densities and γ -ray strength functions of Ta180,181,182},
author = {Brits, C. P. and Malatji, K. L. and Wiedeking, M. and Kheswa, B. V. and Goriely, S. and Garrote, F. L. Bello and Bleuel, D. L. and Giacoppo, F. and Görgen, A. and Guttormsen, M. and Hadynska-Klek, K. and Hagen, T. W. and Hilaire, S. and Ingeberg, V. W. and Jia, H. and Klintefjord, M. and Larsen, A. C. and Majola, S. N. T. and Papka, P. and Péru, S. and Qi, B. and Renstrøm, T. and Rose, S. J. and Sahin, E. and Siem, S. and Tveten, G. M. and Zeiser, F.},
abstractNote = {Particle-$γ$ coincidence experiments were performed at the Oslo Cyclotron Laboratory with the 181Ta($d, X$) and 181Ta(3He, $X$) reactions to measure the nuclear level densities (NLDs) and $γ$-ray strength functions ($γ$SFs) of 180,181,182Ta using the Oslo method. The back-shifted Fermi-gas, constant temperature plus Fermi gas, and Hartree-Fock-Bogoliubov plus combinatorial models were used for the absolute normalizations of the experimental NLDs at the neutron separation energies. The NLDs and $γ$SFs are used to calculate the corresponding 181Ta($n, γ$) cross sections and these are compared to results from other techniques. The energy region of the scissors resonance strength is investigated and from the data and comparison to prior work it is concluded that the scissors strength splits into two distinct parts. This splitting may allow for the determination of triaxiality and a $γ$ deformation of 14.9° ± 1.8° was determined for 181Ta.},
doi = {10.1103/PhysRevC.99.054330},
journal = {Physical Review C},
number = 5,
volume = 99,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on May 29, 2020
Publisher's Version of Record

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Large-scale mean-field calculations from proton to neutron drip lines using the D1S Gogny force
journal, August 2007


Electron scattering in the interacting boson model
journal, April 1981


RIPL – Reference Input Parameter Library for Calculation of Nuclear Reactions and Nuclear Data Evaluations
journal, December 2009


γ decay from the quasicontinuum of Au 197 , 198
journal, May 2015


Description of multi-quasiparticle bands by the tilted axis cranking model
journal, September 2000


Quasicontinuum γ decay of Zr 91 , 92 : Benchmarking indirect ( n , γ ) cross section measurements for the s process
journal, August 2017


Scissors Mode of 162 Dy Studied from Resonance Neutron Capture
journal, January 2015


Experimentally constrained ( p , γ ) Y 89 and ( n , γ ) Y 89 reaction rates relevant to p -process nucleosynthesis
journal, April 2016


The SiRi particle-telescope system
journal, August 2011

  • Guttormsen, M.; Bürger, A.; Hansen, T. E.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 648, Issue 1
  • DOI: 10.1016/j.nima.2011.05.055

Statistical properties of Pu 243 , and Pu 242 ( n , γ ) cross section calculation
journal, January 2016


Positive parity isovector collective states in deformed nuclei
journal, September 1979


La 137 , 138 , 139 ( n , γ ) cross sections constrained with statistical decay properties of La 138 , 139 , 140 nuclei
journal, April 2017


Neutron Capture Cross Sections from 0.1 to 3 MeV by Activation Measurements
journal, April 1976

  • Lindner, M.; Nagle, R. J.; Landrum, J. H.
  • Nuclear Science and Engineering, Vol. 59, Issue 4
  • DOI: 10.13182/NSE76-A26839

The splitting of giant multipole states of deformed nuclei
journal, October 1977


Direct reactions and Hauser-Feshbach theory
journal, April 1975


Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes
journal, January 2014


A Composite Nuclear-Level Density Formula with Shell Corrections
journal, August 1965

  • Gilbert, A.; Cameron, A. G. W.
  • Canadian Journal of Physics, Vol. 43, Issue 8
  • DOI: 10.1139/p65-139

Statistical Gamma-Decay at Low Angular Momentum
journal, January 1990


Global and local level density models
journal, September 2008


Structure of even-even nuclei using a mapped collective Hamiltonian and the D1S Gogny interaction
journal, January 2010


New Isovector Collective Modes in Deformed Nuclei
journal, November 1978


Experimental energy-dependent nuclear spin distributions
journal, November 2009


The Inelastic Scattering of Neutrons
journal, July 1952


Two-phonon J = 1 states in even-mass Te isotopes with A = 122–130
journal, July 1997


Observation of Large Scissors Resonance Strength in Actinides
journal, October 2012


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

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

Effect of triaxial deformations on the splitting of the M1 isovector rotational state
journal, October 1985


Test of gamma-ray strength functions in nuclear reaction model calculations
journal, May 1990


Dipole strength of Ta 181 for the evaluation of the Ta 180 stellar neutron capture rate
journal, October 2014


Investigation of high spin states in 133Cs
journal, May 2018


Novel technique for Constraining r -Process ( n , γ ) Reaction Rates
journal, December 2014


Modern Nuclear Data Evaluation with the TALYS Code System
journal, December 2012


Galactic production of 138 La: Impact of 138,139 La statistical properties
journal, May 2015


Experimental First Order Pairing Phase Transition in Atomic Nuclei
journal, February 2015


Chirality of Nuclear Rotation
journal, June 2000


Cross section measurements of the 181 Ta ( γ , n ) 180 Ta reaction near neutron threshold and the p -process nucleosynthesis
journal, January 2003


Low-lying dipole excitations in the heavy, odd-mass nucleus 181 Ta
journal, August 1998


Local and global nucleon optical models from 1 keV to 200 MeV
journal, January 2003


Experimental level densities of atomic nuclei
journal, December 2015

  • Guttormsen, M.; Aiche, M.; Bello Garrote, F. L.
  • The European Physical Journal A, Vol. 51, Issue 12
  • DOI: 10.1140/epja/i2015-15170-4

Observation of the 1 + scissors mode in the γ -soft nucleus Ba 134
journal, November 1996


Level density and γ -ray strength function in the odd-odd Np 238 nucleus
journal, April 2014


E 1 and M 1 strength functions from average resonance capture data
journal, May 2017


Probing the nuclear magnetic dipole response with electrons, photons and hadrons
journal, January 1995


Extraction of level density and γ strength function from primary γ spectra
journal, June 2000

  • Schiller, A.; Bergholt, L.; Guttormsen, M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 447, Issue 3
  • DOI: 10.1016/S0168-9002(99)01187-0

First Observation of the Scissors Mode in a γ -Soft Nucleus: The Case of 196 Pt
journal, March 1996


ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data
journal, December 2011


Photoneutron cross sections of La, Tb, Ho and Ta
journal, December 1968


Branching and Fragmentation of Dipole Strength in Ta 181 in the Region of the Scissors Mode
journal, September 2016


Low-lying dipole excitations in the transitional nuclei 1 9 0 , 1 9 2 Os
journal, April 1999


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


Developing reliable reaction gamma-ray data
journal, January 2018


A statistical analysis of excited nuclear states
journal, May 1959


New type of nuclear collective motion: The spin scissors mode
journal, July 2013


Systematics of the pygmy resonance in keV neutron capture γ-ray spectra of nuclei with N ≈ 82–126
journal, September 1986


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


Further evidence for the new collective magnetic dipole mode in heavy deformed nuclei
journal, November 1984


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


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


Sum rules and giant resonances in nuclei
journal, April 1989


Nuclear Properties for Astrophysical and Radioactive-Ion-Beam Applications
journal, July 1997

  • MÖLler, P.; Nix, J. R.; Kratz, K. -L.
  • Atomic Data and Nuclear Data Tables, Vol. 66, Issue 2
  • DOI: 10.1006/adnd.1997.0746

New magnetic dipole excitation mode studied in the heavy deformed nucleus 156Gd by inelastic electron scattering
journal, March 1984


Level density parameters for the back-shifted fermi gas model in the mass range 40 < A < 250
journal, December 1973


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

Investigation of nuclear structure by resonance fluorescence scattering
journal, January 1996


Orbital magnetic dipole strength in Sm 1 4 8 , 1 5 0 , 1 5 2 , 1 5 4 and nuclear deformation
journal, November 1990