-ray spectroscopy of the -ray spectroscopy of the sd sd -shell -shell hypernuclei hypernuclei Graduate school of Science, Toho ku University T. Koike Hyperball-J collaboration • Survey of sd-shell hypernuclear c ores • -ray spectroscopy of well defor med hypernuclei • 25Mg • Summary
g -ray spectroscopy of the sd -shell hypernuclei. Graduate school of Science, Tohoku University T. Koike Hyperball-J collaboration. Survey of sd-shell hypernuclear cores g -ray spectroscopy of well deformed hypernuclei 25 L Mg Summary. E13. Z=20. - PowerPoint PPT Presentation
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-ray spectroscopy of the -ray spectroscopy of the sdsd-shell hypernuclei-shell hypernuclei
Graduate school of Science, Tohoku University
T. Koike
Hyperball-J collaboration
• Survey of sd-shell hypernuclear cores• -ray spectroscopy of well deformed hypernuclei
• 25Mg • Summary
1919FF
2020NeNe
2323NaNa
2424MgMg
2727AlAl
2828SiSi
3131PP
3232SS
3535ClCl
4040ArAr
3939KK
4040CaCa
3737ClCl
2626MgMg2525MgMg
2222NeNe
3030SiSi
3434SS
3939ClCl
3838ArAr
2323MgMg
2222NaNa
2727SiSi
2626AlAl
3030PP
3131SS
3434ClCl
3838KK
3939CaCaPossible sd-shell hypernuclei via -ray spectroscopy with
(K-,-) & (+,K+) reactions
Z
Z=20
Z=9
Most abundant isotopes (target)
abundance
proton decay
neutron decay
N
1919NeNe
1818FF
3939ArAr
3636ClCl
3636SS
2525NaNa2424NaNa
2121FF
2121NeNe
E13
Bound states of Bound states of sdsd-shell nuclei and hypernuclei-shell nuclei and hypernuclei
D. J. Millener et al., Phys. Rev. C, 38 2700 (1988)
• Co-existence of shell (mean field) and cluster-like structures • More valence nucleons
•higher level densities (especially odd-odd)
• Collective (rotational) excitation spectrum → low-lying energy •pstates also bound
• Shell model • Cluster model • Self-consistent calculations (12/4 Hagino)(12/4 Hagino)
•RMF•Hatree-Fcok+BCS
•AMD (12/4 Kimura)(12/4 Kimura)
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
18F
19Ne
22Na
23M
g
24M
g
25M
g
26Al
27Si
30P
32S
34C
l
39Ar
38K
39C
a
(keV
)SnSpEx(plambda)
BnBnBpBpEx(pEx(p
Target A -1ZXn-1
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
18F
19Ne
23M
g
24M
g
25M
g
26Al
27Si
30P
32S
34C
l
39Ar
38K
39C
a
(keV
)
28Si
s
pd
(+,K+) T.Hasegawa et al., Phys. Rev. C 53, 1210 (1996)
AZA-1
Z-1 A-1Z
Weak decay
(mostly via non-mesonic in the sd-shell hypernuclei)
- coincidence with Hyperball-J
SKSMinus?
1919FF
2020NeNe
2323NaNa
2424MgMg
2727AlAl
2828SiSi
3131PP
3232SS
3535ClCl
4040ArAr
3939KK
4040CaCa
3737ClCl
2626MgMg2525MgMg
2222NeNe
3030SiSi
3434SS
3939ClCl
3838ArAr
2323MgMg
2222NaNa
2727SiSi
2626AlAl
3030PP
3131SS
3434ClCl
3838KK
3939CaCaPossible sd-shell hypernuclei via -ray spectroscopy with
(K-,-) & (+,K+) reactions
Z
Z=20
Z=9
Most abundant isotopes (target)
abundance
proton decay
neutron decay
N
1919NeNe
1818FF
3939ArAr
3636ClCl
3636SS
2525NaNa2424NaNa
2121FF
2121NeNe
even-even
mirror
E13
)2cossinsin3)1cos3((cos
16
51),( 22
0
RR
CollectiveCollectiveprolateprolate
(, =0°)
(0,0)
sphericalspherical
triaxialtriaxial
Non collective Non collective oblateoblate
(, =60°)
Skyrme Hartree-Fock +BCSSkyrme Hartree-Fock +BCS
• self-consistent mean field• Skyrme-type N interaction• PES of hypernuclei with triaxial deformation: E(E(,,)) • Angular momentum not good quantum number
Myaing Thi Win et al., submitted to PRC
24Mg, 24Mg+
0+
21+
41+
Spectra of a deformed Spectra of a deformed even-eveneven-even nucleus nucleus (collective excitation mode) (collective excitation mode)