Gamma-ray strength functions and a new dimension of partial GDR cross section measurements Hiroaki Utsunomiya Department of Physics, Konan University Kobe, Japan 1. The gSF Method for a Unified Understanding of (g,n) and (n,g) Reactions 2. New Dimension of Partial GDR Cross Section Measurements 6 th Workshop on Nuclear Level Density and Gamma strength Oslo, May 8 -12, 2017
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Gamma-ray strength functions and a new dimension
of partial GDR cross section measurements
Hiroaki Utsunomiya
Department of Physics, Konan University
Kobe, Japan
1. The gSF Method for a Unified Understanding of
(g,n) and (n,g) Reactions
2. New Dimension of Partial GDR Cross Section
Measurements
6th Workshop on Nuclear Level Density and Gamma strength Oslo, May 8 -12, 2017
IAEA-CRP F41032 5 year-project (2016-2020)
H. Utsunomiya (Konan University, Japan) V. Varlamov (Moscow State University, Russian Federation) N. Iwamoto (JAEA, Japan) Y-S. Cho (KAERI, S. Korea) D. Filipescu (IFIN-HH/ELI-NP, Romania) R. Xu (CIAE, China) R. Schwengner (HZDR, Germany) T. Kawano (LANL, USA) R. Firestone (University of California, Berkely, USA) T. Belgya (CER / Hungarian Academy of Sciences, Hungary) S. Goriely (Universite Libre de Bruxelles, Belgium) V. Plujko (Taras Shevchenko National University, Ukraine) M. Wiedeking (iThemba LABS, S. Africa) S. Siem (University of Oslo, Norway) M. Krticka (Charles University in Prague, Czech Rep.)
International Atomic Energy Agency Coordinated Research Project F41032
Reference database of photon
strength functions
Publication of two compilations in 2020
Updated photonuclear data library
Project Officer: P. Dimitriou
PHOENIX* Collaboration for the IAEA-CRP F41032
*Photo-excitation and neutron emission cross (x) sections
Konan University
H. Utsunomiya
ELI-NP Romania
Moscow State U Russia
U of Oslo Norway
SINAP China
ULB Belgium
NewSUBARU Japan
D. Filipescu I. Gheorghe
V. Varlamov S. Belyshev K. Stopani
S. Siem T. Renström G. Tveten A.-C. Larsen
S. Goriely
S. Miyamoto
G. Fan H. Wang
MoU
MoU MoU
MoU
MoU
MoU
4
SPring8
SACLA
NewSUBARU MeV g
1 GeV e- Linac
8 GeV e- synchroton 8 GeV e- linac
8 GeV e- storage ring LEPS, LEPS2 GeV g
Laser Compton scattering
εL〜 1eV Eγ 〜 16 MeV
LE gg
2472 106.1~4/ gg LE
Energy amplification
g= Ee/mc2 (Lorentz factor) 〜 2 x 103 for Ee=1 GeV
Energy profile of the LCS g-ray beam - high- & meadium-energy g-ray beams
Beam profile monitor: 3.5” x 4.0” LaBr3(Ce)
GEANT4 simulations
Energy spread 1.2 – 1.6% in FWHM
10cm Pb double collimators C1=6mmf, C2=2mmf
The gSF Method for a Unified Understanding of
(g,n) and (n,g) Reactions
The (g,n) and (n,g) Reactions are interconnected through the g-ray strength
function based on the Brink hypothesis of the approximate equality of upward
and downward gSFs.
n+AX
A+1X
E, J, p AX(n,g)A+1X A+1X(g,n)AX
fX (g ) g
2 1
(phc)2X
abs(g )
2 1
g Sn
g Sn
Photoneutron emission Radiative neutron capture
continuum
fX (g ) TX (g )
2pg
(2 1)
fX (g ) fX (g ) Brink Hypothesis
(g,n) cross sections
for Nd isotopes
Gogny HFB + QRPA
D1M interaction
M. Martini et al., Nucl. Data Sheets, 118 (2014)
S. Péru and H. Goutte, PRC 77 (2008)
S. Péru and M. Martini, EPJA 50 (2014)
S. Goriely et al., PRL 102 (2009)
Skyrme HFB + QRPA
BSk7 interaction
S. Goriely, E. Khan and M. Samyn, NPA 739 (2004)
H.-T. Nyhus et al., PRC 91 (2015)
gSF
(n,g) cross sections for Nd isotopes
(g,n) cross sections for Sm isotopes
D.M. Filipescu et al., PRC 90 (2014)
(n,g) cross sections for Sm isotopes
(n,g) cross sections for radioactive nuclei
10.98d 1.93d 153Sm 147Nd
117Sn
H. Utsunomiya et al., PRC 80 (2009)
PRC 84 (2011)
Mo isotopes Sn isotopes
H. Utsunomiya et al., PRC 84 (2011) H. Utsunomiya et al., PRC 88 (2013)
74Ge T. Renstrøm et al., PRC 93 (2016)
New Dimension of Partial GDR Cross Section
Measurements The ultimate goal is to resolve the long-standing discrepancy between the Livermore and Saclay data of (g,xn) cross sections.
The majority of experimental data for partial photonuclear reaction cross sections were
obtained at Livermore (USA) and Saclay (France)
Atlas of Photoneutron cross sections obtained with monoenergetic photons
(S.S.Dietrich, B.L.Berman. Atom. Data and Nucl. Data Tables, 38 (1988) 199)