Enhanced γ -Ray Emission from Neutron Unbound States Populated in β Decay

Tain, J. L.; Valencia, E.; Algora, A.; Agramunt, J.; Rubio, B.; Rice, S.; Gelletly, W.; Regan, P.; Zakari-Issoufou, A. -A.; Fallot, M.; Porta, A.; Rissanen, J.; Eronen, T.; Äystö, J.; Batist, L.; Bowry, M.; Bui, V. M.; Caballero-Folch, R.; Cano-Ott, D.; Elomaa, V. -V.; Estevez, E.; Farrelly, G. F.; Garcia, A. R.; Gomez-Hornillos, B.; Gorlychev, V.; Hakala, J.; Jordan, M. D.; Jokinen, A.; Kolhinen, V. S.; Kondev, F. G.; Martínez, T.; Mendoza, E.; Moore, I.; Penttilä, H.; Podolyák, Zs.; Reponen, M.; Sonnenschein, V.; Sonzogni, A. A.

doi:10.1103/PhysRevLett.115.062502

Title: Enhanced $γ$ -Ray Emission from Neutron Unbound States Populated in $β$ Decay

Abstract

Total absorption spectroscopy was used to investigate the β -decay intensity to states above the neutron separation energy followed by γ -ray emission in ^87,88Br and ⁹⁴Rb. Accurate results were obtained thanks to the careful control of systematic errors. An unexpectedly large γ intensity was observed in all three cases extending well beyond the excitation energy region where neutron penetration is hindered by low neutron energy. The γ branching as a function of excitation energy was compared to Hauser-Feshbach model calculations. For ⁸⁷Br and ⁸⁸Br the branching reaches 57% and 20% respectively, and could be explained as a nuclear structure effect. Some of the states populated in the daughter can only decay through the emission of a large orbital angular momentum neutron with a strongly reduced barrier penetrability. In the case of neutron-rich ⁹⁴Rb the observed 4.5% branching is much larger than the calculations performed with standard nuclear statistical model parameters, even after proper correction for fluctuation effects on individual transition widths. The difference can be reconciled introducing an enhancement of one order-of-magnitude in the photon strength to neutron strength ratio. An increase in the photon strength function of such magnitude for very neutron-rich nuclei, if it proved to bemore »« less

Authors:

Tain, J. L. ^[1]; Valencia, E. ^[1]; Algora, A. ^[1]; Agramunt, J. ^[1]; Rubio, B. ^[1]; Rice, S. ^[2]; Gelletly, W. ^[2]; Regan, P. ^[2]; Zakari-Issoufou, A. -A. ^[3]; Fallot, M. ^[3]; Porta, A. ^[3]; Rissanen, J. ^[4]; Eronen, T. ^[4]; Äystö, J. ^[5]; Batist, L. ^[6]; Bowry, M. ^[2]; Bui, V. M. ^[3]; Caballero-Folch, R. ^[7]; Cano-Ott, D. ^[8]; Elomaa, V. -V. ^[4] more »

Univ. of Valencia (Spain). Institute of Corpuscular Physics
Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
Univ. de Nantes, Nantes (France)
Univ. of Jyvaskyla (Finland). Dept. of Physics
Univ. of Helsinki (Finland). Helsinki Institute of Physics
Petersburg Nuclear Physics Institute, Gatchina (Russia)
Universitat Politecnica de Catalunya, Barcelona (Spain)
Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: Sat Aug 01 00:00:00 EDT 2015

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1240585

Alternate Identifier(s):: OSTI ID: 1209177

Report Number(s):: BNL-108020-2015-JA
Journal ID: ISSN 0031-9007; PRLTAO; R&D Project: EST-003-NEFA; KB0301041

Grant/Contract Number:: SC00112704; AC02-06CH11357; FPA2008-06419; FPA2010-17142; FPA2011-24553

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 115; Journal Issue: 6; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Tain, J. L., Valencia, E., Algora, A., Agramunt, J., Rubio, B., Rice, S., Gelletly, W., Regan, P., Zakari-Issoufou, A. -A., Fallot, M., Porta, A., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V. -V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martínez, T., Mendoza, E., Moore, I., Penttilä, H., Podolyák, Zs., Reponen, M., Sonnenschein, V., and Sonzogni, A. A. Enhanced γ -Ray Emission from Neutron Unbound States Populated in β Decay.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevLett.115.062502.

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                    Tain, J. L., Valencia, E., Algora, A., Agramunt, J., Rubio, B., Rice, S., Gelletly, W., Regan, P., Zakari-Issoufou, A. -A., Fallot, M., Porta, A., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V. -V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martínez, T., Mendoza, E., Moore, I., Penttilä, H., Podolyák, Zs., Reponen, M., Sonnenschein, V., & Sonzogni, A. A. Enhanced γ -Ray Emission from Neutron Unbound States Populated in β Decay.  United States.  https://doi.org/10.1103/PhysRevLett.115.062502

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                    Tain, J. L., Valencia, E., Algora, A., Agramunt, J., Rubio, B., Rice, S., Gelletly, W., Regan, P., Zakari-Issoufou, A. -A., Fallot, M., Porta, A., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V. -V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martínez, T., Mendoza, E., Moore, I., Penttilä, H., Podolyák, Zs., Reponen, M., Sonnenschein, V., and Sonzogni, A. A. Sat .  
"Enhanced γ -Ray Emission from Neutron Unbound States Populated in β Decay".  United States.  https://doi.org/10.1103/PhysRevLett.115.062502.  https://www.osti.gov/servlets/purl/1240585.

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@article{osti_1240585,

  title        = {Enhanced γ -Ray Emission from Neutron Unbound States Populated in β Decay},

  author       = {Tain, J. L. and Valencia, E. and Algora, A. and Agramunt, J. and Rubio, B. and Rice, S. and Gelletly, W. and Regan, P. and Zakari-Issoufou, A. -A. and Fallot, M. and Porta, A. and Rissanen, J. and Eronen, T. and Äystö, J. and Batist, L. and Bowry, M. and Bui, V. M. and Caballero-Folch, R. and Cano-Ott, D. and Elomaa, V. -V. and Estevez, E. and Farrelly, G. F. and Garcia, A. R. and Gomez-Hornillos, B. and Gorlychev, V. and Hakala, J. and Jordan, M. D. and Jokinen, A. and Kolhinen, V. S. and Kondev, F. G. and Martínez, T. and Mendoza, E. and Moore, I. and Penttilä, H. and Podolyák, Zs. and Reponen, M. and Sonnenschein, V. and Sonzogni, A. A.},

  abstractNote = {Total absorption spectroscopy was used to investigate the β -decay intensity to states above the neutron separation energy followed by γ -ray emission in 87,88Br and 94Rb. Accurate results were obtained thanks to the careful control of systematic errors. An unexpectedly large γ intensity was observed in all three cases extending well beyond the excitation energy region where neutron penetration is hindered by low neutron energy. The γ branching as a function of excitation energy was compared to Hauser-Feshbach model calculations. For 87Br and 88Br the branching reaches 57% and 20% respectively, and could be explained as a nuclear structure effect. Some of the states populated in the daughter can only decay through the emission of a large orbital angular momentum neutron with a strongly reduced barrier penetrability. In the case of neutron-rich 94Rb the observed 4.5% branching is much larger than the calculations performed with standard nuclear statistical model parameters, even after proper correction for fluctuation effects on individual transition widths. The difference can be reconciled introducing an enhancement of one order-of-magnitude in the photon strength to neutron strength ratio. An increase in the photon strength function of such magnitude for very neutron-rich nuclei, if it proved to be correct, leads to a similar increase in the (n, γ) cross section that would have an impact on r process abundance calculations.},

  doi          = {10.1103/PhysRevLett.115.062502},

  journal      = {Physical Review Letters},

  number       = 6,

  volume       = 115,

  place        = {United States},

  year         = {Sat Aug 01 00:00:00 EDT 2015},

  month        = {Sat Aug 01 00:00:00 EDT 2015}

}

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Works referencing / citing this record:

Total Absorption Spectroscopy
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Algora, A.; Rubio, B.; Tain, J. L.
Nuclear Physics News, Vol. 28, Issue 2
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Similar Records

Title: Enhanced γ -Ray Emission from Neutron Unbound States Populated in β Decay

Abstract

Citation Formats

Gamma-ray emission in competition with neutron emission in the beta decay of 87Br journal, January 1972

Gamma-ray competition with neutron emission in the decay of 137I journal, January 1975

Gamma-ray decay schemes for Kr 93 , Rb 93 , and Sr 93 journal, March 1977

Investigation of beta strength functions by neutron and gamma-ray spectroscopy journal, April 1979

Decay of mass-separated Cs 141 to Ba 141 and systematics of N = 85 isotones journal, September 1982

The beta-decay of95Rb and97Rb journal, March 1983

β decay of the π f 5 / 2 ground state of Cu 77 studied with 225 MeV and 0.2 MeV purified radioactive beams journal, November 2009

β -decay studies of the transitional nucleus Cu 75 and the structure of Zn 75 journal, January 2011

The essential decay of pandemonium: A demonstration of errors in complex beta-decay schemes journal, November 1977

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

Changes in r -process abundances at late times journal, August 2001

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High-energy γ-rays in 87Kr following the decay of 87Br journal, November 1975

Delayed neutrons and high-energy γ-rays from decay of 87Br journal, December 1977

Overlapping β decay and resonance neutron spectroscopy of levels in Kr 87 journal, August 1983

Nuclear Data Sheets for A = 87 journal, March 2002

Nuclear Data Sheets for A = 88 journal, January 2014

Nuclear Data Sheets for A = 94 journal, September 2006

Development and applications of the IGISOL technique journal, October 2001

JYFLTRAP: a cylindrical Penning trap for isobaric beam purification at IGISOL journal, August 2004

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The influence of the unknown de-excitation pattern in the analysis of -decay total absorption spectra journal, February 2007

Algorithms for the analysis of -decay total absorption spectra journal, February 2007

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

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

Reactor Decay Heat in Pu 239 : Solving the γ Discrepancy in the 4–3000-s Cooling Period journal, November 2010

New Antineutrino Energy Spectra Predictions from the Summation of Beta Decay Branches of the Fission Products journal, November 2012

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

Total Absorption Spectroscopy journal, April 2018

Title: Enhanced $γ$ -Ray Emission from Neutron Unbound States Populated in $β$ Decay

Gamma-ray emission in competition with neutron emission in the beta decay of 87Br
journal, January 1972

Gamma-ray competition with neutron emission in the decay of 137I
journal, January 1975

Gamma-ray decay schemes for ${}^{93}{Kr}$ , ${}^{93}{Rb}$ , and ${}^{93}{Sr}$
journal, March 1977

Investigation of beta strength functions by neutron and gamma-ray spectroscopy
journal, April 1979

Decay of mass-separated ${}^{141}{Cs}$ to ${}^{141}{Ba}$ and systematics of $N = 85$ isotones
journal, September 1982

The beta-decay of95Rb and97Rb
journal, March 1983

$β$ decay of the $π f_{5 / 2}$ ground state of ${}^{77}{Cu}$ studied with $225$ MeV and $0.2$ MeV purified radioactive beams
journal, November 2009

$β$ -decay studies of the transitional nucleus ${}^{75}{Cu}$ and the structure of ${}^{75}{Zn}$
journal, January 2011

The essential decay of pandemonium: A demonstration of errors in complex beta-decay schemes
journal, November 1977

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

Changes in r -process abundances at late times
journal, August 2001

Dynamical $r$ -process studies within the neutrino-driven wind scenario and its sensitivity to the nuclear physics input
journal, April 2011

Astrophysical Reaction Rates From Statistical Model Calculations
journal, May 2000

The GT resonance revealed in β+-decay using new experimental techniques
journal, July 1999

$β$ decay of $^{97} Ag$ : Evidence for the Gamow-Teller resonance near $^{100} Sn$
journal, July 1999

High-energy γ-rays in 87Kr following the decay of 87Br
journal, November 1975

Delayed neutrons and high-energy γ-rays from decay of 87Br
journal, December 1977

Overlapping $β$ decay and resonance neutron spectroscopy of levels in ${}^{87}{Kr}$
journal, August 1983

Nuclear Data Sheets for A = 87
journal, March 2002

Nuclear Data Sheets for A = 88
journal, January 2014

Nuclear Data Sheets for A = 94
journal, September 2006

Development and applications of the IGISOL technique
journal, October 2001

JYFLTRAP: a cylindrical Penning trap for isobaric beam purification at IGISOL
journal, August 2004

JYFLTRAP: a Penning trap for precision mass spectroscopy and isobaric purification
journal, April 2012

Geant4—a simulation toolkit
journal, July 2003

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

The sensitivity of LaBr3:Ce scintillation detectors to low energy neutrons: Measurement and Monte Carlo simulation
journal, February 2015

Pulse pileup correction of large NaI(Tl) total absorption spectra using the true pulse shape
journal, July 1999

New Beta-delayed Neutron Measurements in the Light-mass Fission Group
journal, June 2014

The influence of the unknown de-excitation pattern in the analysis of -decay total absorption spectra
journal, February 2007

Algorithms for the analysis of -decay total absorption spectra
journal, February 2007

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

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

Reactor Decay Heat in ${}^{239}{Pu}$ : Solving the $γ$ Discrepancy in the 4–3000-s Cooling Period
journal, November 2010

New Antineutrino Energy Spectra Predictions from the Summation of Beta Decay Branches of the Fission Products
journal, November 2012

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

Total Absorption Spectroscopy
journal, April 2018