Evidence for the dipole nature of the low-energy γ enhancement in Fe56

Larsen, A. C.; Blasi, N.; Bracco, A.; Camera, F.; Eriksen, T. K.; Gorgen, A.; Guttormsen, M.; Hagen, T. W.; Leoni, S.; Million, B.; Nyhus, H. T.; Renstrom, T.; Rose, S. J.; Ruud, I. E.; Siem, S.; Tornyi, T.; Tveten, G. M.; Voinov, A. V.; Wiedeking, M.

doi:10.1103/PhysRevLett.111.242504

Title: Evidence for the dipole nature of the low-energy $γ$ enhancement in ${}^{56}{Fe}$

Abstract

Here, the γ-ray strength function of ⁵⁶Fe has been measured from proton-γ coincidences for excitation energies up to ≈11 MeV. The low-energy enhancement in the γ-ray strength function, which was first discovered in the (³He,αγ)⁵⁶Fe reaction, is confirmed with the (p,p'γ)⁵⁶Fe experiment reported here. Angular distributions of the γ rays give for the first time evidence that the enhancement is dominated by dipole transitions.

Authors:

Larsen, A. C. ^[1]; Blasi, N. ^[2]; Bracco, A. ^[3]; Camera, F. ^[3]; Eriksen, T. K. ^[1]; Gorgen, A. ^[1]; Guttormsen, M. ^[1]; Hagen, T. W. ^[1]; Leoni, S. ^[3]; Million, B. ^[2]; Nyhus, H. T. ^[1]; Renstrom, T. ^[1]; Rose, S. J. ^[1]; Ruud, I. E. ^[1]; Siem, S. ^[1]; Tornyi, T. ^[4]; Tveten, G. M. ^[1]; Voinov, A. V. ^[5]; Wiedeking, M. ^[6]

Univ. of Oslo, Oslo (Norway)
INFN, Milano (Italy)
INFN, Milano (Italy); Univ. of Milano, Milano (Italy)
Univ. of Oslo, Oslo (Norway); MTA ATOMKI, Debrecen (Hungary)
Ohio Univ. Athens, OH (United States)
iThemba LABS, Somerset West (South Africa)

Publication Date:: Wed Dec 11 00:00:00 EST 2013

Research Org.:: Ohio Univ., Athens, OH (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1256982

Grant/Contract Number:: NA0001837; FG02-88ER40387

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 111; Journal Issue: 24; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Gamma strength function

Citation Formats


                    Larsen, A. C., Blasi, N., Bracco, A., Camera, F., Eriksen, T. K., Gorgen, A., Guttormsen, M., Hagen, T. W., Leoni, S., Million, B., Nyhus, H. T., Renstrom, T., Rose, S. J., Ruud, I. E., Siem, S., Tornyi, T., Tveten, G. M., Voinov, A. V., and Wiedeking, M. Evidence for the dipole nature of the low-energy γ enhancement in Fe56.  United States: N. p., 2013. 
Web.  doi:10.1103/PhysRevLett.111.242504.

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                    Larsen, A. C., Blasi, N., Bracco, A., Camera, F., Eriksen, T. K., Gorgen, A., Guttormsen, M., Hagen, T. W., Leoni, S., Million, B., Nyhus, H. T., Renstrom, T., Rose, S. J., Ruud, I. E., Siem, S., Tornyi, T., Tveten, G. M., Voinov, A. V., & Wiedeking, M. Evidence for the dipole nature of the low-energy γ enhancement in Fe56.  United States.  https://doi.org/10.1103/PhysRevLett.111.242504

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                    Larsen, A. C., Blasi, N., Bracco, A., Camera, F., Eriksen, T. K., Gorgen, A., Guttormsen, M., Hagen, T. W., Leoni, S., Million, B., Nyhus, H. T., Renstrom, T., Rose, S. J., Ruud, I. E., Siem, S., Tornyi, T., Tveten, G. M., Voinov, A. V., and Wiedeking, M. Wed .  
"Evidence for the dipole nature of the low-energy γ enhancement in Fe56".  United States.  https://doi.org/10.1103/PhysRevLett.111.242504.  https://www.osti.gov/servlets/purl/1256982.

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@article{osti_1256982,

  title        = {Evidence for the dipole nature of the low-energy γ enhancement in Fe56},

  author       = {Larsen, A. C. and Blasi, N. and Bracco, A. and Camera, F. and Eriksen, T. K. and Gorgen, A. and Guttormsen, M. and Hagen, T. W. and Leoni, S. and Million, B. and Nyhus, H. T. and Renstrom, T. and Rose, S. J. and Ruud, I. E. and Siem, S. and Tornyi, T. and Tveten, G. M. and Voinov, A. V. and Wiedeking, M.},

  abstractNote = {Here, the γ-ray strength function of 56Fe has been measured from proton-γ coincidences for excitation energies up to ≈11 MeV. The low-energy enhancement in the γ-ray strength function, which was first discovered in the (3He,αγ)56Fe reaction, is confirmed with the (p,p'γ)56Fe experiment reported here. Angular distributions of the γ rays give for the first time evidence that the enhancement is dominated by dipole transitions.},

  doi          = {10.1103/PhysRevLett.111.242504},

  journal      = {Physical Review Letters},

  number       = 24,

  volume       = 111,

  place        = {United States},

  year         = {Wed Dec 11 00:00:00 EST 2013},

  month        = {Wed Dec 11 00:00:00 EST 2013}

}

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Works referencing / citing this record:

Combined analysis of the low-energy enhancement of the gamma-strength function and the giant dipole resonance
journal, August 2019

Ngwetsheni, Cebo; Orce, José Nicolás
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Title: Evidence for the dipole nature of the low-energy γ enhancement in Fe 56

Abstract

Citation Formats

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

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

Evidence for M 1 Scissors Resonances Built on the Levels in the Quasicontinuum of Dy 163 journal, April 2004

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

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

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

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

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

Impact of a low-energy enhancement in the γ -ray strength function on the neutron-capture cross section journal, July 2010

γ -strength functions in Ni 60 from two-step cascades following proton capture journal, February 2010

Low-energy limit of the radiative dipole strength in nuclei journal, September 2013

The SiRi particle-telescope system journal, August 2011

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

Characterization of large volume 3.5″×8″ LaBr3:Ce detectors journal, November 2013

Investigation of the properties of a 1″×1″ LaBr3:Ce scintillator journal, November 2007

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

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

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

Level density of Fe 56 and low-energy enhancement of γ-strength function journal, July 2006

Co 59 ( p , α ) Fe 56 and Fe 56 ( p , p ′ ) Reactions journal, September 1966

Experimental energy-dependent nuclear spin distributions journal, November 2009

Photoneutron cross sections for Mn 55 and Co 59 journal, July 1979

Tables of attenuation coefficients for angular distribution of gamma rays from partially aligned nuclei journal, January 1974

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

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

Large enhancement of radiative strength for soft transisitons in the quasicontinuum text, January 2004

Extraction of level density and gamma strength function from primary gamma spectra text, January 1999

Combined analysis of the low-energy enhancement of the gamma-strength function and the giant dipole resonance journal, August 2019

The low-energy M1 γ -strength from radiative proton capture experiment journal, January 2015

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

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

Consolidating the concept of low-energy magnetic dipole decay radiation text, January 2018

Title: Evidence for the dipole nature of the low-energy $γ$ enhancement in ${}^{56}{Fe}$

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

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

Evidence for $M 1$ Scissors Resonances Built on the Levels in the Quasicontinuum of ${}^{163}{Dy}$
journal, April 2004

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

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

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

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

Low-Energy Enhancement in the Photon Strength of ${}^{95}{Mo}$
journal, April 2012

Impact of a low-energy enhancement in the $γ$ -ray strength function on the neutron-capture cross section
journal, July 2010

$γ$ -strength functions in ${}^{60}{Ni}$ from two-step cascades following proton capture
journal, February 2010

Low-energy limit of the radiative dipole strength in nuclei
journal, September 2013

The SiRi particle-telescope system
journal, August 2011

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

Characterization of large volume 3.5″×8″ LaBr3:Ce detectors
journal, November 2013

Investigation of the properties of a 1″×1″ LaBr3:Ce scintillator
journal, November 2007

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

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

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

Level density of ${}^{56}{Fe}$ and low-energy enhancement of γ-strength function
journal, July 2006

${Co}^{59} (p, α) {Fe}^{56}$ and ${Fe}^{56} (p, p^{'})$ Reactions
journal, September 1966

Experimental energy-dependent nuclear spin distributions
journal, November 2009

Photoneutron cross sections for ${}^{55}{Mn}$ and ${}^{59}{Co}$
journal, July 1979

Tables of attenuation coefficients for angular distribution of gamma rays from partially aligned nuclei
journal, January 1974

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

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

Large enhancement of radiative strength for soft transisitons in the quasicontinuum
text, January 2004

Extraction of level density and gamma strength function from primary gamma spectra
text, January 1999

Combined analysis of the low-energy enhancement of the gamma-strength function and the giant dipole resonance
journal, August 2019

The low-energy M1 γ -strength from radiative proton capture experiment
journal, January 2015

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

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

Consolidating the concept of low-energy magnetic dipole decay radiation
text, January 2018