rcnp sunflower spectroscopy of unstable nuclei with fast and slow beam experiments at ribf ―...
TRANSCRIPT
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RCNP
SUNFLOWER Spectroscopy of Unstable Nuclei with Fast and sLOW beam Experiments
at RIBF
― In-beam Gamma-ray Spectroscopy with FastExotic Beams at RIBF
AOI Nori (RCNP, Osaka Univ.)
for SUNFLOWER collaboration
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RCNPSUNFLOWER experiments
2008 DayOne / 48Ca32Ne H. Scheit, P. Doornenbal PRL103(2009)032501, CPL29(2012)10230131,33Na H. Scheit, P. Doornenbal PRC81(2010)041305
2010 48Ca~42Si S. Takeuchi, M. MatsushitaPRL 109(2012)182501
36,38Mg P. Doornenbal, H. Scheit PRL 111(2013)21250229F P. Doornenbal~Al, P D. Steppenbeck33Mg D. Bazin 40Mg test P. Fallon, H.L.Crawford PRC89(2014)04130331Ne, 22C T. Nakamura PRL103(2009)262501,
PRL112(2014) 142501N. Kobayashi PRC86(2012)054604
2011 238U 78Ni K. Yoneda~132Sn H. Wang, NA PRC88(2013)054318
PTEP2014:023D02 , CPL30(2013) 0425012012 124Xe / 70Zn
10xSn A. Obertelli, P. Doornenbal54Ca D. Steppenbeck, S. Takeuchi Nature 502(2013)207
2013 238U74Ni G. de Angelis
2014 238U136Sn H. Wang, NASEASTAR P. Doornenbal, A. Obertelli
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RCNPRegion of Interest
N=28
N=50
N=82
N=126
Z=20
Z=28
Z=50
r-process
86Kr/136Xe/238U 1pμA
Collectivity: B(E2), Ex(2+)Type of Coll.: Ex(2+) / Ex(4+)Single Part.: Ex, Jπ
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RCNPRegion of Interest
N=28
N=50
N=82
N=126
Z=20
Z=28
Z=50
r-process
86Kr/136Xe/238U 1pμA
Collectivity: B(E2), Ex(2+)Type of Coll.: Ex(2+) / Ex(4+)Single Part.: Ex, Jπ
Island ofInversion
N=34Magic#
~100Sn
~132Sn
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RCNPRegion of Interest
N=28
N=50
N=82
N=126
Z=20
Z=28
Z=50
r-process
86Kr/136Xe/238U 1pμA
Collectivity: B(E2), Ex(2+)Type of Coll.: Ex(2+) / Ex(4+)Single Part.: Ex, JπPS1-A004
30Ne H. Liu
PS1-A021 ~78NiY. Shiga
PS1-A024 122-126Pd H. Wang
PS2-A029 35MgS. Momiyama
MINOS A. Obertelli
54Ca D. Steppenbeck
10xSn A. Corsi
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RCNP
F7
F7
F5
F1
IRC
F2 F8
F11
F3
F12
ProductionTarget
SRC
1st stage separation 2nd stage
analysis ZeroDegreeanalysis of 2ndaryreaction products
γ-ray spectroscopy setup @ BigRIPS/ZeroDegree
Target
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RCNP
F7
F7
F5
F1
IRC
F2 F8
F11
F3
F12
ProductionTarget
SRC
1st stage separation 2nd stage
analysis ZeroDegreeanalysis of 2ndaryreaction products
γ-ray spectroscopy setup @ BigRIPS/ZeroDegree
Target
DALI2
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RCNP
F7
F7
F5
F1
IRC
F2 F8
F11
F3
F12
ProductionTarget
SRC
1st stage separation 2nd stage
analysis ZeroDegreeanalysis of 2ndaryreaction products
γ-ray spectroscopy setup @ BigRIPS/ZeroDegree
Target
DALI2Projectile PID@BigRIPS
Ejectile PID@ZeroDegree
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RCNPRegion of Interest
N=28
N=50
N=82
N=126
Z=20
Z=28
Z=50
r-process
86Kr/136Xe/238U 1pμA
Collectivity: B(E2), Ex(2+)Type of Coll.: Ex(2+) / Ex(4+)Single Part.: Ex, Jπ
Island ofInversion
N=34Magic#
~100Sn
~132Sn
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RCNP
20
8
28
34Mg
30Ne
32Mg
Island of Inversion
32Mg: T. Motobayashi et al., PLB 346, 9 (1995).31F: H. Sakurai et al., PLB 448, 180 (1999).34Mg: K. Yoneda et al., PLB 449, 233 (2001).30Ne: Y. Yanagisawa et al., PLB 556, 84 (2003).
Island of deformation
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RCNPγ-ray spectra for 38Mg
P. Doornenbal, et al., PRL 111, 212502 (2013).
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RCNP
20
8
28
34Mg32Mg
Island of Inversion
Island of deformation
36Mg38Mg
36,38Mg: P. Doornenbal, et al., PRL 111, 212502 (2013).
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RCNP
20
8
28
34Mg32Mg
Island of Inversion
Island of deformation
36Mg38Mg
36,38Mg: P. Doornenbal, et al., PRL 111, 212502 (2013).
42Si: S. Takeuchi et al., PRL 109, 182501 (2012) Ex(4+) Large deformation in 42Si
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RCNPEx(2+) and Ex(4+) in Mg/Si @ N=20~28
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RCNPEx(2+) and Ex(4+) in Mg/Si @ N=20~28
Almost identical in34Mg, 36Mg, 38Mg
Smooth transition in Si
Sound magicityin Si @ N=20
Large collectivityin Si/Mg @ N~28
Magicity disappearedin Mg @ N=20
Ex(2+)[MeV]
R4/2
Mg
Si34Si
32Mg 42Si
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RCNP
20
8
28
32Mg
Island of Inversion
32Mg: T. Motobayashi et al., PLB 346, 9 (1995).31F: H. Sakurai et al., PLB 448, 180 (1999).34Mg: K. Yoneda et al., PLB 449, 233 (2001).30Ne: Y. Yanagisawa et al., PLB 556, 84 (2003).
Island of deformation
32Ne: P. Doornenbal et al., PRL 103, 032501 (2009).42Si: S. Takeuchi et al., PRL 109, 182501 (2012).36,38Mg: P. Doornenbal, et al., PRL 111, 212502 (2013).
29F
29F : 28O+p
28O
p
28O
p
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RCNP
USDA/B: B.A.Brown and W.A.Richter, PRC74(2006)034315SDPF-M: Y.Utsuno et al., PRC60(1999)054315
Inclusion of pf-shell necessary
29F belongs to Island of inversion agreement with
BE calculations using SDPF-M
2p-2h configuration seen in IOI
29F : Belongs to Island of inversion
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RCNP
-2003
20
8
28
34Mg32Mg
Island of Inversion
32Mg: T. Motobayashi et al., PLB 346, 9 (1995).31F: H. Sakurai et al., PLB 448, 180 (1999).34Mg: K. Yoneda et al., PLB 449, 233 (2001).30Ne: Y. Yanagisawa et al., PLB 556, 84 (2003).
Island of deformation
32Ne: P. Doornenbal et al., PRL 103, 032501 (2009).42Si: S. Takeuchi et al., PRL 109, 182501 (2012).36,38Mg: P. Doornenbal, et al., PRL 111, 212502 (2013).
36Mg 38Mg
29F
42Si
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RCNP
2013
20
8
28
34,36,38Mg32Mg
31FIsland of Inversion
Mg
32Ne
42Si
32Mg: T. Motobayashi et al., PLB 346, 9 (1995).31F: H. Sakurai et al., PLB 448, 180 (1999).34Mg: K. Yoneda et al., PLB 449, 233 (2001).30Ne: Y. Yanagisawa et al., PLB 556, 84 (2003).
Island of deformation
32Ne: P. Doornenbal et al., PRL 103, 032501 (2009).42Si: S. Takeuchi et al., PRL 109, 182501 (2012).36,38Mg: P. Doornenbal, et al., PRL 111, 212502 (2013).
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RCNP
2013
20
8
28
34,36,38Mg32Mg
31FIsland of Inversion
Mg
32Ne
42Si
32Mg: T. Motobayashi et al., PLB 346, 9 (1995).31F: H. Sakurai et al., PLB 448, 180 (1999).34Mg: K. Yoneda et al., PLB 449, 233 (2001).30Ne: Y. Yanagisawa et al., PLB 556, 84 (2003).
Island of deformation
32Ne: P. Doornenbal et al., PRL 103, 032501 (2009).42Si: S. Takeuchi et al., PRL 109, 182501 (2012).36,38Mg: P. Doornenbal, et al., PRL 111, 212502 (2013).
N=34?
54Ca
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RCNP“New” magic number N=34 in 54Ca
ARIS talk on Friday
David Steppenbeck (CNS, Tokyo)In-Beam Gamma-Ray Spectroscopy of
Very Neutron-Rich N=32 and 34 Nuclei
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RCNPRegion of Interest
N=28
N=50
N=82
N=126
Z=20
Z=28
Z=50
r-process
86Kr/136Xe/238U 1pμA
Collectivity: B(E2), Ex(2+)Type of Coll.: Ex(2+) / Ex(4+)Single Part.: Ex, Jπ
Island ofInversion
N=34Magic#
~100Sn
~132Sn
~78Ni
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RCNPB(E2) Systematics in Sn
ARIS Talk on Monday
Anna Corsi (CEA Saclay) Shell Evolution towards 100Sn
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RCNPRegion of Interest
N=28
N=50
N=82
N=126
Z=20
Z=28
Z=50
r-process
86Kr/136Xe/238U 1pμA
Collectivity: B(E2), Ex(2+)Type of Coll.: Ex(2+) / Ex(4+)Single Part.: Ex, Jπ
Island ofInversion
N=34Magic#
~100Sn
~132Sn
~78Ni
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RCNP
H. Wang
H. Wang
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RCNP
H. Wang
H. Wang
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RCNP
J. Dobaczewski et al., Phys. Rev. C 53,2809(1996)
r-process waiting points corresponding to r-process abundance peak
Significant changes in the shell structure with (very) large N/Z
Shell quenching at N=82 and the r-process abundance
Shell structure of the nuclei beyond 132Sn
N/Z ~1.6N/Z ~ 3 N/Z
Shell reordering
Quenching or NOT Quenching at N=82, this is the question
Quenching
Not Quenching
Shell gap disappear
N=82 magic number disappear in neutron-rich region
StabilityNeutron-drip line
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RCNP
PdAgCdIn
70 76 80 82 84 86 88
SnSbTeIXe
787472
Valley
of sta
bility
2+ excited state known
2+ excited state unknown
126Pd124Pd122Pd
136Sn
Motivation
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RCNP
F7
F7
F5
F1
IRC
F2 F8
F11
F3
F12
ProductionTarget
SRC
1st stage separation 2nd stage
analysis ZeroDegreeanalysis of 2ndaryreaction products
γ-ray spectroscopy setup @ BigRIPS/ZeroDegree
Target
DALI2
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RCNP
137Sb
A-1
A+3
A
ZeroDegree PIDBigRIPS PID
137Sb 136Sn
Particle Identification
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RCNP
Q=Z-1
Q=Z
136Sn50+
ZeroDegree PID
Particle Identification137Sb 136Sn
Charge State ID by TKE
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RCNPThe first 2+ excited state in 136SnOne proton removal reaction
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RCNP
• Z=50 magicity in N=86 isotones• Constant Ex(2+) beyond N=82 Seniority scheme• Asymmetric Ex(2+) pattern around N=82
Systematics of Ex(2+)
• Z=50 magicity in N=86 isotones• Constant Ex(2+) beyond N=82 Seniority scheme• Asymmetric Ex(2+) pattern around N=82
Mass Number A
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RCNP
• Z=50 magicity in N=86 isotones• Constant Ex(2+) beyond N=82 Seniority scheme• Asymmetric Ex(2+) pattern around N=82
Systematics of Ex(2+)
• Z=50 magicity in N=86 isotones• Constant Ex(2+) beyond N=82 Seniority scheme• Asymmetric Ex(2+) pattern around N=82
Mass Number A Mass Number A
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RCNP
• Z=50 magicity in N=86 isotones• Constant Ex(2+) beyond N=82 Seniority scheme• Asymmetric Ex(2+) pattern around N=82
~500 keV
Systematics of Ex(2+)
• Z=50 magicity in N=86 isotones• Constant Ex(2+) beyond N=82 Seniority scheme• Asymmetric Ex(2+) pattern around N=82
Mass Number A Mass Number A
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RCNP
Mean-field calculations cannot reproduce •Constancy•asymmetry with respective to N=82
Comparison with Theory
Mass Number A
Neutron Number N
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RCNP
Δ(3)(N)=(-1)N[B(N-1)+B(N+1)-2B(N)]/2Reduction of pairing ?
N<82
N>82
J. Hakala, et al., PRL 109, 032501(2012)
Possible Reason
A. Jokinen’s talk at ARIS2014
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RCNP
PdAgCdIn
70 76 80 82 84 86 88
SnSbTeIXe
787472
Valley
of sta
bility
2+ excited state known
2+ excited state unknown
126Pd124Pd122Pd
136Sn
Motivation
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RCNPγ-ray spectra for 120,122,124,126Pd
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RCNP
• The collectivity decreases towards N=82 due to the shell effect
• All systematics are similar to those of the Xe (Z=54)
• Overall systematics trends are well reproduced by two IBM-2 calculations using a model space with a good N=82 shell closure
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RCNPRegion of Interest
N=28
N=50
N=82
N=126
Z=20
Z=28
Z=50
r-process
86Kr/136Xe/238U 1pμA
Collectivity: B(E2), Ex(2+)Type of Coll.: Ex(2+) / Ex(4+)Single Part.: Ex, Jπ
Island ofInversion
N=34Magic#
~100Sn
~132Sn
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RCNPRegion of Interest
N=28
N=50
N=82
N=126
Z=20
Z=28
Z=50
r-process
86Kr/136Xe/238U 1pμA
Collectivity: B(E2), Ex(2+)Type of Coll.: Ex(2+) / Ex(4+)Single Part.: Ex, Jπ
Island ofInversion
N=34Magic#
~100Sn
~132Sn
MINOS A. Obertelli
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Shell Evolution and Search for Two-plus EnergiesAt the RIBF (SEASTAR) – a RIKEN Physics program
Spokespersons: P. Doornenbal (RIKEN), A. Obertelli (CEA, RIKEN)
You are welcome to the SEASTAR collaboration! http://www.nishina.riken.jp/collaboration/SUNFLOWER/experiment/seastar/index.html
PSP framework promoted by H. Sakurai (RIKEN, Univ. of Tokyo)
ARIS talk on Wed Alexandre Obertelli (CEA Saclay / RIKEN) EPJ A sponsored lecture : Physics Program with MINOS at RIBF
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RCNPFuture
• Beam intensity will continue increasing
Expansion of region
• More elaborate measurements
Higher excited states
Low energy reactions (OEDO [Shimoura])
• New detectors
Shogun ?
Ge based (tracking array?)
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RCNPCAGRA(Clover Array)
Clover with BGO suppressor x 16
US:10
Tohoku :6
• Approved by DOE
• Transportation
• Digital electronics
• Liq. N2 filling system
CAGRA (Clover Array Gamma-ray spectrometer
at RCNP/RIBF for Advanced research)
M. Carpenter, E. Ideguchi, T. Koike et al.
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RCNPCAGRA@RCNP
High Spin with RI beam at EN course
Giant Resonance/Charge exchangeAt Grand Raiden
不安定核ビームライン
Heavy ion primary beam (Stable)
Various unstable nuclei
Beams of unstable nuclei of interest
Selection
Target
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RCNPCAGRA@RIBF ?
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RCNPGe Tracking Detector in Japan
RCNP One Ge module with
four segmented crystalFunded(To be delivered in 2015 Mar)
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RCNPCollaborators
36,38Mg, 42SiP. Doornenbal, H. Scheit, S. Takeuchi , N. Aoi , K. Li , M. Matsushita, D. Steppenbeck, H. Wang, H. Baba, H. Crawford, C.R. Hoffman, R. Hughes, E. Ideguchi, N. Kobayashi, Y. Kondo, J. Lee, S. Michimasa, T. Motobayashi, H. Sakurai, M. Takechi, Y. Togano, R. Winkler, and K. Yoneda
RIKEN Nishina Center, Peking University, Rikkyo, LBNL, ANL, Richmondm CNS, NSCL/MSU
122,124,126Pd, 136SnH. Wang, N. Aoi, S. Takeuchi, M. Matsushita4, P. Doornenbal, T. Motobayashi, D. Steppenbeck, K. Yoneda, H. Baba, Z. Dombrádi, K. Kobayashi, Y. Kondo, J. Lee, H. Liu1, R. Minakata, D. Nishimura, H. Otsu, H. Sakurai, D. Sohler, Y.L. Sun, Z.-Y. Tian, R. Tanaka, Z. Vajta, Z.-H. Yang, T.Yamamoto, Y.-L. Ye, and R. Yokoyama
Peking, RIKEN Nishina Center, RCNP, Osaka, ,CNS, Tokyo, Rikkyo, TITech, Tokyo Univeristy of Science