58 Ni(p, n) 58 Cu E p = 160 MeV 58 Ni( 3 He, t) 58 Cu E = 140 MeV/u Counts Excitation Energy (MeV) 0 2 4 6 8 10 12 14 mparison of (p, n) and ( 3 He,t) 0 o spec Y. Fujita et al., EPJ A 13 (’02) 411 H. Fujita et al., PRC 75 (’07) 03431 J. Rapaport et NPA (‘83) GTGR
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58 Ni(p, n) 58 Cu E p = 160 MeV 58 Ni( 3 He, t) 58 Cu E = 140 MeV/u Counts Excitation Energy (MeV) 0 2 4 6 8 10 12 14 Comparison of (p, n) and ( 3 He,t)
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58Ni(p, n)58Cu Ep = 160 MeV
58Ni(3He, t)58Cu E = 140 MeV/u
Cou
nts
Excitation Energy (MeV)0 2 4 6 8 10 12 14
Comparison of (p, n) and (3He,t) 0 o spectra
Y. Fujita et al.,EPJ A 13 (’02) 411.
H. Fujita et al.,PRC 75 (’07) 034310
J. Rapaport et al.NPA (‘83)
GTGR
*GT () : Important weak response, simple operator
Yoshitaka FUJITA (Osaka Univ.)
New Era of Nuclear Physics in the Cosmos RIKEN August 25-26, 2008
Nuclear Weak and EM Response Studied by Intermediate-energy Nuclear
Reactions (中間エネルギー核反応による原子核弱電磁応答)
-decay : absolute B(GT), but only low-lying states
(-induced reactions: no chance !) CE reaction : relative B(GT), but highly excited region
*GT () : Important weak response, simple operator
*E1 : Important electro-magnetic response (’) [NRF] : up to particle threshold (g, n) : above particle threshold inelastic SC. at 0o : Coulomb Ex. + Nucl. Ex.
Yoshitaka FUJITA (Osaka Univ.)
New Era of Nuclear Physics in the Cosmos RIKEN August 25-26, 2008
Nuclear Weak and EM Response Studied by Intermediate-energy Nuclear Reactions
( 中間エネルギー核反応による原子核弱電磁応答)
-decay : absolute B(GT), but only low-lying states
(-induced reactions: no chance !) CE reaction : relative B(GT), but highly excited region
mainly by &
Langanke & Martinez-PinedoRev.Mod.Phys.75(’04)819
(A,Z)=nuclei in the Fe, Ni region
-decay, e-capture, -induced reactions
Balantekin & FullerJ.Phys.G 29(’03)2513
Crucial Weak Processesduring the
Core Collapse
Gamow-Teller (GT) transitions
Simulation of -decay spectrum
Direct Reactions with Light Projectiles
Projectile3He
Target
Coulomb Excitation
Elastic Scattering
Inelastic Scattering
Pick-up Stripping
Charge-exchange
Similarity with decay!by Berta Rubio
|i> |f>
-int.
Ejectile t
-decay & Nuclear Reaction
)GT(1 2
2/1
BKf
tGT -decay tra. str. =
B(GT) : reduced GT transition strength
(matrix element)2
*Nuclear (CE) Reaction Cross-section= reaction mechanism x operator x structure =(matrix element)2
A simple reaction mechanism should be achieved ! we have to go to high incoming energy
-decay & Nuclear Reaction
)GT(1 2
2/1
BKf
tGT -decay strength =
B(GT) : reduced GT transition strength
(matrix element)2
*Nuclear (CE) Reaction cross-section= reaction mechanism x operator x structure =(matrix element)2
A simple reaction mechanism should be achieved ! we have to go to high incoming energy