Photoneutron reaction cross section measurements on Mo94 and Zr90 relevant to the p -process nucleosynthesis

Banu, A.; Meekins, E. G.; Silano, J. A.; Karwowski, H. J.; Goriely, S.

doi:10.1103/physrevc.99.025802

Title: Photoneutron reaction cross section measurements on ${}^{94}{Mo}$ and ${}^{90}{Zr}$ relevant to the $p$ -process nucleosynthesis

Abstract

The photodisintegration cross sections for the 94Mo(gamma,n) and 90Zr(gamma,n) reactions have been experimentally investigated with quasi-monochromatic photon beams at the High Intensity gamma-ray Source (HIgammaS) facility of the Triangle Universities Nuclear Laboratory (TUNL). The energy dependence of the photoneutron reaction cross sections was measured with high precision from the respective neutron emission thresholds up to 13.5 MeV. These measurements contribute to a broader investigation of nuclear reactions relevant to the understanding of the p-process nucleosynthesis. The results are compared with the predictions of Hauser-Feshbach statistical model calculations using two different models for the dipole gamma-ray strength function. The resulting 94Mo(gamma,n) and 90Zr(gamma,n) photoneutron stellar reaction rates as a function of temperature in the typical range of interest for the p-process nucleosynthesis show how sensitive the photoneutron stellar reaction rate can be to the experimental data in the vicinity of the neutron threshold.

Authors:

Banu, A. ^[1]; Meekins, E. G. ^[1]; Silano, J. A. ^[2]; Karwowski, H. J. ^[2]; Goriely, S. ^[3]

James Madison Univ., Harrisonburg, VA (United States)
Triangle Universities Nuclear Laboratory, Durham, NC (United States); Univ. of North Carolina, Chapel Hill, NC (United States)
Université Libre de Bruxelles, Brussels (Belgium)

Publication Date:: Mon Feb 11 00:00:00 EST 2019

Research Org.:: University of North Carolina, Chapel Hill, NC (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1658816

Alternate Identifier(s):: OSTI ID: 1494222; OSTI ID: 1497975; OSTI ID: 1658959

Report Number(s):: LLNL-JRNL-752885
Journal ID: ISSN 2469-9985; arXiv: 1808.04937; TRN: US2203359

Grant/Contract Number:: FG02-97ER41033; AC52-07NA27344; FG02-97ER41041

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 99; Journal Issue: 2; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; photodisintegration; lepton induced nuclear reactions; nuclear astrophysics; nuclear physics of explosive environments; nuclear reactions; nucleosynthesis in explosive environments; thermal & statistical models

Citation Formats


                    Banu, A., Meekins, E. G., Silano, J. A., Karwowski, H. J., and Goriely, S. Photoneutron reaction cross section measurements on Mo94 and Zr90 relevant to the p -process nucleosynthesis.  United States: N. p., 2019. 
Web.  doi:10.1103/physrevc.99.025802.

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                    Banu, A., Meekins, E. G., Silano, J. A., Karwowski, H. J., & Goriely, S. Photoneutron reaction cross section measurements on Mo94 and Zr90 relevant to the p -process nucleosynthesis.  United States.  https://doi.org/10.1103/physrevc.99.025802

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                    Banu, A., Meekins, E. G., Silano, J. A., Karwowski, H. J., and Goriely, S. Mon .  
"Photoneutron reaction cross section measurements on Mo94 and Zr90 relevant to the p -process nucleosynthesis".  United States.  https://doi.org/10.1103/physrevc.99.025802.  https://www.osti.gov/servlets/purl/1658816.

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@article{osti_1658816,

  title        = {Photoneutron reaction cross section measurements on Mo94 and Zr90 relevant to the p -process nucleosynthesis},

  author       = {Banu, A. and Meekins, E. G. and Silano, J. A. and Karwowski, H. J. and Goriely, S.},

  abstractNote = {The photodisintegration cross sections for the 94Mo(gamma,n) and 90Zr(gamma,n) reactions have been experimentally investigated with quasi-monochromatic photon beams at the High Intensity gamma-ray Source (HIgammaS) facility of the Triangle Universities Nuclear Laboratory (TUNL). The energy dependence of the photoneutron reaction cross sections was measured with high precision from the respective neutron emission thresholds up to 13.5 MeV. These measurements contribute to a broader investigation of nuclear reactions relevant to the understanding of the p-process nucleosynthesis. The results are compared with the predictions of Hauser-Feshbach statistical model calculations using two different models for the dipole gamma-ray strength function. The resulting 94Mo(gamma,n) and 90Zr(gamma,n) photoneutron stellar reaction rates as a function of temperature in the typical range of interest for the p-process nucleosynthesis show how sensitive the photoneutron stellar reaction rate can be to the experimental data in the vicinity of the neutron threshold.},

  doi          = {10.1103/physrevc.99.025802},

  journal      = {Physical Review C},

  number       = 2,

  volume       = 99,

  place        = {United States},

  year         = {Mon Feb 11 00:00:00 EST 2019},

  month        = {Mon Feb 11 00:00:00 EST 2019}

}

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Reference database for photon strength functions
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DOI: 10.1140/epja/i2019-12840-1

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Title: Photoneutron reaction cross section measurements on Mo 94 and Zr 90 relevant to the p -process nucleosynthesis

Abstract

Citation Formats

Thep-nuclei: abundances and origins journal, January 1992

Astrophysical Reaction Rates From Statistical Model Calculations journal, May 2000

Enhanced electric dipole strength below particle-threshold as a consequence of nuclear deformation journal, June 2009

OPPORTUNITIES TO CONSTRAIN ASTROPHYSICAL REACTION RATES FOR THE s -PROCESS VIA DETERMINATION OF THE GROUND-STATE CROSS-SECTIONS journal, August 2011

Special features of the isospin splitting of the giant dipole resonance in the 90Zr nucleus journal, February 2009

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

The p-process in supernovae journal, February 1978

Cross-Section Measurements of the Kr 86 ( γ , n ) Reaction to Probe the s -Process Branching at Kr 85 journal, September 2013

Measurement of the Am 241 ( γ , n ) Am 240 reaction in the giant dipole resonance region journal, November 2010

Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of ( γ , n ) and ( n , γ ) reactions in the rare earth region journal, January 2015

Neutrino-Induced Nucleosynthesis of A > 64 Nuclei: The ν p Process journal, April 2006

The giant dipole states in the A = 90 mass region journal, November 1971

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

Photoneutron cross sections for Ni isotopes: Toward understanding ( n , γ ) cross sections relevant to weak s -process nucleosynthesis journal, November 2018

Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section journal, July 2002

Large-scale deformed quasiparticle random-phase approximation calculations of the γ -ray strength function using the Gogny force journal, July 2016

γ -ray strength function for Sn 116 , 117 with the pygmy dipole resonance balanced in the photoneutron and neutron capture channels journal, November 2009

Pygmy resonances and radiative nucleon captures for stellar nucleosynthesis journal, April 2015

Role of deformation on giant resonances within the quasiparticle random-phase approximation and the Gogny force journal, April 2008

Global and local level density models journal, September 2008

Photoneutron Cross Sections for Zr 90 , Zr 91 , Zr 92 , Zr 94 , and Y 89 journal, October 1967

Synthesis of the Elements in Stars journal, October 1957

The p-process of stellar nucleosynthesis: astrophysics and nuclear physics status journal, September 2003

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

A study of the photoneutron contribution to the giant dipole resonance in doubly even Mo isotopes journal, July 1974

Photoneutron cross sections for Mo isotopes: A step toward a unified understanding of ( γ , n ) and ( n , γ ) reactions journal, July 2013

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

Gogny-Hartree-Fock-Bogolyubov plus quasiparticle random-phase approximation predictions of the M 1 strength function and its impact on radiative neutron capture cross section journal, October 2016

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

Pygmy dipole strength in Zr 90 journal, December 2008

Absolute photoneutron cross sections for Zr, I, Pr, Au, and Pb journal, October 1987

Semimicroscopic nucleon-nucleus spherical optical model for nuclei with A >~ 40 at energies up to 200 MeV journal, August 1998

Photon flux monitor for a mono-energetic gamma ray source journal, July 2009

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

Characterization of an INVS model IV neutron counter for high precision () cross-section measurements journal, August 2011

Radiative strength functions in Mo 93 − 98 journal, April 2005

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

TYPE Ia SUPERNOVAE AS SITES OF THE p -PROCESS: TWO-DIMENSIONAL MODELS COUPLED TO NUCLEOSYNTHESIS journal, September 2011

Determination of the Ce 142 ( γ , n ) cross section using quasi-monoenergetic Compton backscattered γ rays journal, March 2014

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

Absolute cross section for the photodisintegration of deuterium journal, December 1985

Measurement of the (γ, n) cross section of the nucleus 197Au close above the reaction threshold journal, August 2002

Geant4—a simulation toolkit journal, July 2003

He-detonation in sub-Chandrasekhar CO white dwarfs: A new insight into energetics and $\mathsf{{\vec p}}$-process nucleosynthesis journal, March 2002

Total Cross Section for Deuteron Photodisintegration between 15 and 75 MeV journal, September 1986

Research opportunities at the upgraded HIγS facility journal, January 2009

Lane-consistent, semimicroscopic nucleon-nucleus optical model journal, January 2001

Induced polarization in the H 2 ( γ , n → ) H 1 reaction at low energy journal, September 2005

TESTING THE ROLE OF SNe Ia FOR GALACTIC CHEMICAL EVOLUTION OF p -NUCLEI WITH TWO-DIMENSIONAL MODELS AND WITH s -PROCESS SEEDS AT DIFFERENT METALLICITIES journal, January 2015

Type Ia Supernovae as Sites of p-process: Two-Dimensional Models Coupled to Nucleosynthesis text, January 2011

Opportunities to constrain astrophysical reaction rates for the s-process through determination of the ground state cross sections text, January 2011

Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section text, January 2002

Reference database for photon strength functions journal, October 2019

Title: Photoneutron reaction cross section measurements on ${}^{94}{Mo}$ and ${}^{90}{Zr}$ relevant to the $p$ -process nucleosynthesis

Thep-nuclei: abundances and origins
journal, January 1992

Astrophysical Reaction Rates From Statistical Model Calculations
journal, May 2000

Enhanced electric dipole strength below particle-threshold as a consequence of nuclear deformation
journal, June 2009

OPPORTUNITIES TO CONSTRAIN ASTROPHYSICAL REACTION RATES FOR THE s -PROCESS VIA DETERMINATION OF THE GROUND-STATE CROSS-SECTIONS
journal, August 2011

Special features of the isospin splitting of the giant dipole resonance in the 90Zr nucleus
journal, February 2009

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

The p-process in supernovae
journal, February 1978

Cross-Section Measurements of the ${}^{86}{Kr} (γ, n)$ Reaction to Probe the $s$ -Process Branching at ${}^{85}{Kr}$
journal, September 2013

Measurement of the ${}^{241}{Am}$ $(γ, n)$ ${}^{240}{Am}$ reaction in the giant dipole resonance region
journal, November 2010

Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of $(γ, n)$ and $(n, γ)$ reactions in the rare earth region
journal, January 2015

Neutrino-Induced Nucleosynthesis of $A > 64$ Nuclei: The $ν p$ Process
journal, April 2006

The giant dipole states in the A = 90 mass region
journal, November 1971

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

Photoneutron cross sections for Ni isotopes: Toward understanding $(n, γ)$ cross sections relevant to weak $s$ -process nucleosynthesis
journal, November 2018

Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section
journal, July 2002

Large-scale deformed quasiparticle random-phase approximation calculations of the $γ$ -ray strength function using the Gogny force
journal, July 2016

$γ$ -ray strength function for ${}^{116, 117}{Sn}$ with the pygmy dipole resonance balanced in the photoneutron and neutron capture channels
journal, November 2009

Pygmy resonances and radiative nucleon captures for stellar nucleosynthesis
journal, April 2015

Role of deformation on giant resonances within the quasiparticle random-phase approximation and the Gogny force
journal, April 2008

Global and local level density models
journal, September 2008

Photoneutron Cross Sections for ${Zr}^{90}$ , ${Zr}^{91}$ , ${Zr}^{92}$ , ${Zr}^{94}$ , and $Y^{89}$
journal, October 1967

Synthesis of the Elements in Stars
journal, October 1957

The p-process of stellar nucleosynthesis: astrophysics and nuclear physics status
journal, September 2003

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

A study of the photoneutron contribution to the giant dipole resonance in doubly even Mo isotopes
journal, July 1974

Photoneutron cross sections for Mo isotopes: A step toward a unified understanding of $(γ, n)$ and $(n, γ)$ reactions
journal, July 2013

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

Gogny-Hartree-Fock-Bogolyubov plus quasiparticle random-phase approximation predictions of the $M 1$ strength function and its impact on radiative neutron capture cross section
journal, October 2016

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

Pygmy dipole strength in ${}^{90}{Zr}$
journal, December 2008

Absolute photoneutron cross sections for Zr, I, Pr, Au, and Pb
journal, October 1987

Semimicroscopic nucleon-nucleus spherical optical model for nuclei with $A >~ 40$ at energies up to 200 MeV
journal, August 1998

Photon flux monitor for a mono-energetic gamma ray source
journal, July 2009

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

Characterization of an INVS model IV neutron counter for high precision () cross-section measurements
journal, August 2011

Radiative strength functions in ${}^{93 - 98}{Mo}$
journal, April 2005

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

TYPE Ia SUPERNOVAE AS SITES OF THE p -PROCESS: TWO-DIMENSIONAL MODELS COUPLED TO NUCLEOSYNTHESIS
journal, September 2011

Determination of the ${}^{142}{Ce}$ $(γ, n)$ cross section using quasi-monoenergetic Compton backscattered $γ$ rays
journal, March 2014

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

Absolute cross section for the photodisintegration of deuterium
journal, December 1985

Measurement of the (γ, n) cross section of the nucleus 197Au close above the reaction threshold
journal, August 2002

Geant4—a simulation toolkit
journal, July 2003

He-detonation in sub-Chandrasekhar CO white dwarfs: A new insight into energetics and $\mathsf{{\vec p}}$-process nucleosynthesis
journal, March 2002

Total Cross Section for Deuteron Photodisintegration between 15 and 75 MeV
journal, September 1986

Research opportunities at the upgraded HIγS facility
journal, January 2009

Lane-consistent, semimicroscopic nucleon-nucleus optical model
journal, January 2001

Induced polarization in the ${}^{2}H$ ( $γ, \vec{n}$ ) ${}^{1}H$ reaction at low energy
journal, September 2005

TESTING THE ROLE OF SNe Ia FOR GALACTIC CHEMICAL EVOLUTION OF p -NUCLEI WITH TWO-DIMENSIONAL MODELS AND WITH s -PROCESS SEEDS AT DIFFERENT METALLICITIES
journal, January 2015

Type Ia Supernovae as Sites of p-process: Two-Dimensional Models Coupled to Nucleosynthesis
text, January 2011

Opportunities to constrain astrophysical reaction rates for the s-process through determination of the ground state cross sections
text, January 2011

Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section
text, January 2002

Reference database for photon strength functions
journal, October 2019