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Title: γ-ray decay from neutron-bound and unbound states in 95Mo and a novel technique for spin determination

Journal Article · · Physical Review C
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [5];  [8];  [9];  [6];  [5];  [10];  [5];  [11];  [5];  [5];  [5];  [6] more »;  [12] « less
  1. iThemba LABS, Somerset West (South Africa)
  2. Charles Univ., Prague (Czech Republic)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
  4. Univ. of Richmond, Richmond, VA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  9. Univ. of California, Berkeley, CA (United States)
  10. Univ. of Oslo, Oslo (Norway)
  11. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Wisconsin-La Crosse, La Crosse, WI (United States)
  12. Florida State Univ., Tallahassee, FL (United States)

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC05-00OR22725; AC52-07NA27344; AC02-05CH11231
OSTI ID:
1266017
Alternate ID(s):
OSTI ID: 1236537; OSTI ID: 1379229; OSTI ID: 1474373
Report Number(s):
LLNL-JRNL-678755; KB0401022; ERKBP06
Journal Information:
Physical Review C, Vol. 93, Issue 2; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Study of the surrogate-reaction method applied to neutron-induced capture cross sections journal June 2012
Absolute full-energy peak efficiency calibration of a Clover–BGO detector system
  • Elekes, Z.; Belgya, T.; Molnár, G. L.
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journal May 2003
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  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 621, Issue 1-3 https://doi.org/10.1016/j.nima.2010.04.017
journal September 2010
Level densities and thermodynamical quantities of heated Mo 93 98 isotopes journal March 2006
Effect of Competition between Gamma-Ray and Particle Emission on Excitation Functions journal July 1961
Nuclear Data Sheets for A = 95 journal October 2010
Smarter Use of Nuclear Waste journal December 2005
Gamma-ray decay schemes for Kr 93 , Rb 93 , and Sr 93 journal March 1977
The Mo 96 ( p , d ) Mo 95 reaction at 50 MeV journal September 2004
Neutron interactions as seen by a segmented germanium detector journal April 2008
Particle- γ spectroscopy of the ( p , d γ ) Gd 155 reaction: Neutron single-quasiparticle states at N = 91 journal June 2010
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Spectroscopic Studies of Molybdenum Isotopes with ( d ,   t ) Reactions journal June 1970
β -decay studies of the transitional nucleus Cu 75 and the structure of Zn 75 journal January 2011
Measurement of the Mo 97 ( n , γ ) reaction with the DANCE γ calorimeter array journal July 2015
Gamma-ray competition with neutron emission in the decay of 137I journal January 1975
Measurement of γ -emission branching ratios for Gd 154 , 156 , 158 compound nuclei: Tests of surrogate nuclear reaction approximations for ( n , γ ) cross sections journal March 2010
Statistical γ rays in the analysis of surrogate nuclear reactions journal May 2012
Simulation of γ cascades in complex nuclei with emphasis on assessment of uncertainties of cascade-related quantities journal November 1998
Nuclear Structure Studies in the Molybdenum Isotopes with ( d ,   p ) and ( d ,   t ) Reactions journal August 1964
Systematics of l = 5 (d,p) transitions in nuclei with 89 ⩽ A ⩽ 101 journal October 1969
Indirect determination of neutron capture cross sections on spherical and near-spherical nuclei using the surrogate method journal May 2012
Thermal neutron capture cross sections of the palladium isotopes journal May 2008
Two-step γ cascades following thermal neutron capture in Mo 95 journal May 2008
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Neutron hole states of Mo 9 3 , 9 5 journal June 1977
In-beam gamma-ray spectroscopy of odd-neutron Mo and Ru isotopes journal July 1971
Test of the statistical model in Mo 96 with the BaF 2 γ calorimeter DANCE array journal February 2009
Validating (d,p γ ) as a Surrogate for Neutron Capture journal January 2015
Constraining nuclear photon strength functions by the decay properties of photo-excited states journal December 2013
Gamma-ray emission in competition with neutron emission in the beta decay of 87Br journal January 1972
Gamma competition in the decay of unbound states in 56Fe produced by the 56Fe(n, n′) reaction with 14 MeV neutrons journal October 1977
Low-Energy Enhancement in the Photon Strength of Mo 95 journal April 2012

Cited By (1)

Low-energy enhancement and fluctuations of γ -ray strength functions in 56,57 Fe: test of the Brink–Axel hypothesis journal April 2017

Similar Records

Most theoretical approaches used in nuclear astrophysics to model the nucleosynthesis of heavy elements incorporate the so-called statistical model in order to describe the excitation and decay properties of atomic nuclei. One of the basic assumptions of this model is the validity of the Brink–Axel hypothesis and the related concept of so-called photon strength functions to describe γ-ray transition probabilities. We present a novel experimental approach that allows for the first time to experimentally determine the photon strength function simultaneously in two independent ways by a unique combination of quasi-monochromatic photon beams and a newly implemented γ–γ coincidence setup. This technique does not assume a priori the validity of the Brink–Axel hypothesis and sets a benchmark in terms of the detection sensitivity for measuring decay properties of photo-excited states below the neutron separation energy. The data for the spherical off-shell nucleus 128Te were obtained for γ-ray beam-energy settings between 3 MeV and 9 MeV in steps of 130 keV for the lower beam energies and in steps of up to 280 keV for the highest beam settings. We present a quantitative analysis on the consistency of the derived photon strength function with the Brink–Axel hypothesis. The data clearly demonstrate a discrepancy of up to a factor of two between the photon strength functions extracted from the photoabsorption and photon emission process, respectively. In addition, we observe that the photon strength functions are not independent of the excitation energy, as usually assumed. Thus, we conclude, that the Brink–Axel hypothesis is not strictly fulfilled in the excitation-energy region below the neutron separation threshold (Sn = 8.78 MeV) for the studied case of 128Te.
Journal Article · Tue Jan 01 00:00:00 EST 2019 · Physics Letters B · OSTI ID:1266017

Strong γ-ray emission from neutron unbound states populated in β-decay: Impact on (n,γ) cross-section estimates
Journal Article · Wed Sep 13 00:00:00 EDT 2017 · EPJ Web of Conferences · OSTI ID:1266017

Enhanced γ -Ray Emission from Neutron Unbound States Populated in β Decay
Journal Article · Sat Aug 01 00:00:00 EDT 2015 · Physical Review Letters · OSTI ID:1266017