Tracking saddle-to-scission dynamics using N/Z in...
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Tracking saddle-to-scission dynamics using N/Z in projectile
breakup reactions
SYLVIE HUDANApril 1, 2012
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Dynamical Breakup
Montoya et al., PRL73, 3070 (1994); Bocage et al., NPA676, 391 (2000)
Davin et al., PRC65, 064614 (2002); Colin et al., PRC67, 064603 (2003)
McIntosh et al., PRC81, 034603 (2010)
From Colin et al.
Observation of strongly aligned decay in mid-peripheral collisions at intermediate energies with:
Large yieldLarge relative velocity relative to fission
S. Hudan et al., PRC71, 05402 (2006)
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Dynamical Breakup
➡ Transiently deformed nuclei➡ Early cluster production
Montoya et al., PRL73, 3070 (1994); Bocage et al., NPA676, 391 (2000)
Davin et al., PRC65, 064614 (2002); Colin et al., PRC67, 064603 (2003)
McIntosh et al., PRC81, 034603 (2010)
From Colin et al.
Observation of strongly aligned decay in mid-peripheral collisions at intermediate energies with:
Large yieldLarge relative velocity relative to fission
S. Hudan et al., PRC71, 05402 (2006)
AMD
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Dynamical Breakup
➡ Transiently deformed nuclei➡ Early cluster production
Montoya et al., PRL73, 3070 (1994); Bocage et al., NPA676, 391 (2000)
Davin et al., PRC65, 064614 (2002); Colin et al., PRC67, 064603 (2003)
McIntosh et al., PRC81, 034603 (2010)
From Colin et al.
Observation of strongly aligned decay in mid-peripheral collisions at intermediate energies with:
Large yieldLarge relative velocity relative to fission
S. Hudan et al., PRC71, 05402 (2006)
AMD
What is the isotopic composition of those fragments?
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Experimental Setup124Xe 124Sn 112Sn1.30 1.48 1.24
FIRST: T. Paduszynski et al., NIMA 547, 464 (2005)
124(,136)Xe + 112, 124Sn @ 49.2 MeV/AExperiment performed at GANIL (France)
N/Z
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BEAM
April 1, 2012Sylvie Hudan, APS April Meeting 2012
Experimental Setup124Xe 124Sn 112Sn1.30 1.48 1.24
FIRST: T. Paduszynski et al., NIMA 547, 464 (2005)
124(,136)Xe + 112, 124Sn @ 49.2 MeV/AExperiment performed at GANIL (France)
N/Z
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BEAM
April 1, 2012Sylvie Hudan, APS April Meeting 2012
Experimental Setup
• T1: Si-Si-CsI(Tl)- 2.8° ≤ θLab ≤ 6.6°- Z = 1-55; A for Z = 1-14
124Xe 124Sn 112Sn1.30 1.48 1.24
273µm Si(IP) 1001µm Si(IP) 3.3cm CsI(Tl)/PD
48 rings 16 “pies”
48 rings 16 “pies” 16 “pies”
FIRST: T. Paduszynski et al., NIMA 547, 464 (2005)
124(,136)Xe + 112, 124Sn @ 49.2 MeV/AExperiment performed at GANIL (France)
N/Z
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BEAM
April 1, 2012Sylvie Hudan, APS April Meeting 2012
Experimental Setup
• T1: Si-Si-CsI(Tl)- 2.8° ≤ θLab ≤ 6.6°- Z = 1-55; A for Z = 1-14
• T2: Si-CsI(Tl)- 7.3° ≤ θLab ≤ 14.3°- Z = 1-24; A for Z=1-8
124Xe 124Sn 112Sn1.30 1.48 1.24
273µm Si(IP) 1001µm Si(IP) 3.3cm CsI(Tl)/PD
48 rings 16 “pies”
48 rings 16 “pies” 16 “pies”
16 rings (x4 quadrants) 16 “pies”
16 “pies”
3.3 cm CsI(Tl)/PD 500µm Si(IP)
FIRST: T. Paduszynski et al., NIMA 547, 464 (2005)
124(,136)Xe + 112, 124Sn @ 49.2 MeV/AExperiment performed at GANIL (France)
N/Z
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BEAM
April 1, 2012Sylvie Hudan, APS April Meeting 2012
Experimental Setup
• T1: Si-Si-CsI(Tl)- 2.8° ≤ θLab ≤ 6.6°- Z = 1-55; A for Z = 1-14
• T2: Si-CsI(Tl)- 7.3° ≤ θLab ≤ 14.3°- Z = 1-24; A for Z=1-8
• LASSA: 36.4° ≤ θLab ≤ 51.5°• DEMON: n TOF
124Xe 124Sn 112Sn1.30 1.48 1.24
273µm Si(IP) 1001µm Si(IP) 3.3cm CsI(Tl)/PD
48 rings 16 “pies”
48 rings 16 “pies” 16 “pies”
16 rings (x4 quadrants) 16 “pies”
16 “pies”
3.3 cm CsI(Tl)/PD 500µm Si(IP)
FIRST: T. Paduszynski et al., NIMA 547, 464 (2005)
124(,136)Xe + 112, 124Sn @ 49.2 MeV/AExperiment performed at GANIL (France)
N/Z
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Aligned Decay Angle between the relative velocity and the fragment “parent” velocity
ZH
ZL
α
TLF*
npvREL
vc.m.
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Aligned Decay
• Asymmetric angular distributions• Larger asymmetry for lighter ZL
• Asymmetry persists up to ZL = 18• Similar yield for n-rich target*
Angle between the relative velocity and the fragment “parent” velocity
ZH
ZL
α
TLF*
npvREL
vc.m.
*: Backward enhancement observed in Sn+Ni for change of target and projectile
P. Russotto et al., PRC 81, 064605 (2010)
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Isotopic Composition vs Rotation Angle
• Backward emission neutron-rich relative to forward emission
• Fragment neutron content enhanced for larger alignment
• No visible target effect of the relative neutron composition
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Relative Velocity Dependence
90°-180°66°-90°37°-66°0°-37°
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Relative Velocity Dependence• ⟨N⟩/Z decreases with vREL for forward decay (Coulomb effect)
• ⟨N⟩/Z increases with vREL for backward decay
90°-180°66°-90°37°-66°0°-37°
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Relative Velocity Dependence• ⟨N⟩/Z decreases with vREL for forward decay (Coulomb effect)
• ⟨N⟩/Z increases with vREL for backward decay
• All backward decays show the same dependence with vREL
90°-180°66°-90°37°-66°0°-37°
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Relative Velocity Dependence
More aligned decay with higher vREL ⇒ observed angular dependence
• ⟨N⟩/Z decreases with vREL for forward decay (Coulomb effect)
• ⟨N⟩/Z increases with vREL for backward decay
• All backward decays show the same dependence with vREL
90°-180°66°-90°37°-66°0°-37°
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Time Extraction
t = 0
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• The rotation angle can be related to time via the rotational frequency ω:
April 1, 2012Sylvie Hudan, APS April Meeting 2012
Time Extraction
t =α
ω
t = 0
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• The rotation angle can be related to time via the rotational frequency ω:
April 1, 2012Sylvie Hudan, APS April Meeting 2012
Time Extraction
t =α
ω
t
t = 0
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• The rotation angle can be related to time via the rotational frequency ω:
•ω in the range 0.7-0.6 1021 rad/s corresponding to based on previous studies*.
� ≈ 40�
April 1, 2012Sylvie Hudan, APS April Meeting 2012
Time Extraction
t =α
ω
*: G. Casini et al., PRL 71, 2567 (1993)
t = T/4
t = 0
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• The rotation angle can be related to time via the rotational frequency ω:
•ω in the range 0.7-0.6 1021 rad/s corresponding to based on previous studies*.
• The correlation between <vREL> and the rotation angle is monotonous (5th degree polynom parametrization).
� ≈ 40�
April 1, 2012Sylvie Hudan, APS April Meeting 2012
Time Extraction
t =α
ω
*: G. Casini et al., PRL 71, 2567 (1993)
t = T/4
t = 0
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• The rotation angle can be related to time via the rotational frequency ω:
•ω in the range 0.7-0.6 1021 rad/s corresponding to based on previous studies*.
• The correlation between <vREL> and the rotation angle is monotonous (5th degree polynom parametrization).
vREL ⇒ angle ⇒ time
� ≈ 40�
April 1, 2012Sylvie Hudan, APS April Meeting 2012
Time Extraction
t =α
ω
*: G. Casini et al., PRL 71, 2567 (1993)
t = T/4
t = 0
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
N/Z Time Dependence
66°-90° 37°-66°0°-37°
1 zs = 10-21 s
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
N/Z Time Dependence
• ZL = 4• Strong time dependence• Two components
66°-90° 37°-66°0°-37°
1 zs = 10-21 s
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
N/Z Time Dependence
• ZL = 4• Strong time dependence• Two components
• ZL = 5,6• Time dependence not as pronounced as for ZL = 4
66°-90° 37°-66°0°-37°
1 zs = 10-21 s
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
N/Z Time Dependence
• ZL = 4• Strong time dependence• Two components
• ZL = 5,6• Time dependence not as pronounced as for ZL = 4
• ZL = 8• Similar dependence for both short and long times
66°-90° 37°-66°0°-37°
1 zs = 10-21 s
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Conclusions
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
ConclusionsThe ⟨N⟩/Z of fragments emitted in dynamical decay is correlated with the rotation angle.Different vREL dependence are observed for forward and backward emission.For backward decays, ⟨N⟩/Z increases with vREL with a similar magnitude for all angles.Evolution of ⟨N⟩/Z over 2-3 zs (600-900 fm/c)
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
ConclusionsThe ⟨N⟩/Z of fragments emitted in dynamical decay is correlated with the rotation angle.Different vREL dependence are observed for forward and backward emission.For backward decays, ⟨N⟩/Z increases with vREL with a similar magnitude for all angles.Evolution of ⟨N⟩/Z over 2-3 zs (600-900 fm/c)
Difference in ⟨N⟩/Z time dependence for different ZL may be related to differences in the initial di-nuclear configuration (different position relative to saddle and scission points).In the future, use of damped reactions at radioactive beam facilities?
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April 1, 2012Sylvie Hudan, APS April Meeting 2012
Collaboration and AcknowledgementsIndiana University: A.B. McIntosh, S. Hudan, J. Black, D. Mercier, C.J. Metelko, R. Yanez, R.T. de Souza
GANIL: A. Chbihi
GSI: S. Bianchin, C. Schwarz, W. Trautmann
Université Laval, Québec: M.O. Frégeau, J. Gauthier, J. Moisan, R. Roy
WMU: M. Famiano
Thanks to:• The support of the GANIL staff and facility• The DEMON collaboration
This work was supported by the DOE Office of Science under the Grant No. DEFG02-88ER-40404