Lifetime measurements with fast-timing arrays

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Ben Crider 1 Lifetime measurements with fast-timing arrays Ben Crider FRIB Decay Workshop January 25-26, 2018

Transcript of Lifetime measurements with fast-timing arrays

Page 1: Lifetime measurements with fast-timing arrays

Ben Crider1

Lifetime measurements with fast-timing arrays

Ben CriderFRIB Decay Workshop

January 25-26, 2018

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Overview

• Shell structure helps lay out a roadmap of interesting structural features

• Experimentally determined properties described in terms of shell structure

• Large-scale shell model calculations and ab initio calculations (NCSM, IM-SRG, and their merger) have exciting prospects as they move towards expanding our understanding of medium-mass nuclei

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Overview

• Shell structure helps lay out a roadmap of interesting structural features

• Experimentally determined properties described in terms of shell structure

• Large-scale shell model calculations and ab initio calculations (NCSM, IM-SRG, and their merger) have exciting prospects as they move towards expanding our understanding of medium-mass nuclei

S. Mukhopadhyay et al, Phys. Rev. C 95, 014327 (2017)

76Ge

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Shell Evolution

• Many shell model calculations predict a modified shell structure in nuclei away from the 𝛽-stability line

T. Otsuka et al., Phys. Rev. Lett. 104, 012501 (2010)

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FRIB Nuclei

M. Thoennessen, Nuclear Data Sheets 118, 85 – 90 (2014)

• FRIB will enable the study of many exotic nuclei

• Even for nuclei near the extremes of the FRIB production rates, 𝛽-decay studies are a viable means for determining their low-lying properties

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Energy Systematics

• Need to go beyond energy systematics to measuring transition strengths and comparing with large-scale theoretical calculations

A. Gade and S. N. Liddick, J. Phys. G: Nucl. Part. Phys. 43 (2016) 024001.

28Ni (E0+/2)

27Co

29Cu

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Lifetimes around the nuclear chart

M. Thoennessen, Nuclear Data Sheets 118, 85 – 90 (2014)

• A lot of useful information can be determined through measuring lifetimes all throughout the nuclear chart

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Lifetimes of proton-rich nuclei

H. Mach et al., Phys. Rev. C 95, 014313 (2017)

M. Thoennessen, Nuclear Data Sheets 118, 85 – 90 (2014)

94Ru, 96Pd

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Lifetimes of neutron-rich nuclei

M. Thoennessen, Nuclear Data Sheets 118, 85 – 90 (2014) S. Suchyta et al., Phys. Rev. C 89, 021301(R) (2014)

068Ni E(keV)

1603

2511

0+

0+

0+

68Ni

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0

68Ni 70Ni

1604

2511

0+

0+

0+

• MCSM calculations also predict shape coexistence in 70Ni• Deepening of the prolate potential well

0+

0+

1525

0http://fustipen.ganil.fr/conferences/2014/workshops/understanding-nuclear-structure-and-reactions-microscopically-including-the-continuum-2/talks/otsuka_fustipen.pdf

Predicted Shape Coexistence in 70Ni

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National Superconducting Cyclotron Laboratory

9Be target

A1900 Fragment Separator

Cocktail beam A~68 delivered to experimental end-station

76Ge 130 MeV/u primary beam

Coupled Cyclotron Facility at NSCL

Fragmentation of a fast-moving, heavy, stable beam on a thin stable target

• 76Ge beam at ~130 MeV/A• 282 µg/cm2 9Be target

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N. Larson et al., Nucl. Instrum. Methods Phys. Res. A 727, 59 (2013)C. J. Prokop, et al., Nucl. Instrum. Methods Phys. Res. A 741, 163 (2014)

• Use beta decay to populate excited states of exotic nuclei near A = 68

• Combine detection systems to simultaneously achieve fast timing information and high-resolution energy measurements

Central Implantation Detectors: Implanted ions from beam and beta decays

M. Alshudifat et al., Physics Procedia 66, 445 (2015).

NSCL Experiment: Detection SystemsIons identified event-by-

event are implanted. Position and arrival time

recorded for all implanted ions

Some characteristic time later a decay is detected. Position and time of decay

recorded.

• Decays are correlated to ions using spatial and temporal information

• Time scales: Beta decay: ~10-3 s, Gamma decay: ~10-15 to 10-9 s

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Half of 16 HPGe SeGA arrayLaBr3(Ce) array

Gamma-ray Detectors

N. Larson et al., Nucl. Instrum. Methods Phys. Res. A 727, 59 (2013)C. J. Prokop, et al., Nucl. Instrum. Methods Phys. Res. A 741, 163 (2014)

W. Mueller et al., Nucl. Instrum. Methods Phys. Res. A 466, 492 (2001)

Central Implantation Detectors: Implanted ions from beam and beta decays

M. Alshudifat et al., Physics Procedia 66, 445 (2015).

Time (~ps or ~ns)

g1 or bg2Dt related to

T1/2

NSCL Experiment: Detection Systems

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Lifetime ResultsB.P. Crider, C.J. Prokop, S.N. Liddick et al., (in prep.)

68Cu

68Zn

β-

1077.4-keVγ ray

2+

0+

1077.4

0

1.61 ps

B. P. Crider et al., Phys. Lett. B 763, 108 (2016).

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Lifetime Results

70Co

70Ni

β-

448-keVγ ray

6+

4+

2677

2229

1.05(3) ns [1]

B. P. Crider et al., Phys. Lett. B 763, 108 (2016)

H. Mach et al., Nucl. Phys. A 719, C213 (2003)

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Lifetime ResultsCorrelated decays into 70Ni

Time (ns)

En

erg

y (

keV

)C

ou

nts

/ 1

keV

Energy (keV)

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Lifetime Results478 keV

B. P. Crider et al., Phys. Lett. B 763, 108 (2016)

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Lifetime Results

307 keV

B. P. Crider et al., Phys. Lett. B 763, 108 (2016)

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Putting it all together for 68,70Ni…S. Suchyta et al., Phys. Rev. C 89, 021301(R) (2014). http://fustipen.ganil.fr/conferences/2014/workshops/understanding-

nuclear-structure-and-reactions-microscopically-including-the-continuum-2/talks/otsuka_fustipen.pdf

B. P. Crider et al., Phys. Lett. B 763, 108 (2016)S. M. Lenzi et al., Phys. Rev. C 82, 054301 (2010)

Y. Tsunoda et al., Phys. Rev. C 89, 031301 (2014)

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Putting it all together for 68,70Ni…S. Suchyta et al., Phys. Rev. C 89, 021301(R) (2014). http://fustipen.ganil.fr/conferences/2014/workshops/understanding-

nuclear-structure-and-reactions-microscopically-including-the-continuum-2/talks/otsuka_fustipen.pdf

B. P. Crider et al., Phys. Lett. B 763, 108 (2016)S. M. Lenzi et al., Phys. Rev. C 82, 054301 (2010)

Y. Tsunoda et al., Phys. Rev. C 89, 031301 (2014)

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Lifetime of the 02+ in 68Ni

C.J. Prokop, B.P. Crider, S.N. Liddick et al., (in prep.)

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Conclusions

• FRIB opens up a large number of nuclei for which 𝛽-decay experiments can provide many details on their low-lying structure

• Lifetime measurements leading to transition strength determinations are critical for understanding the underlying configurations of excited nuclear states.

• A recent experiment at NSCL coupling fast-timing and high-resolution detection systems has enabled an expansion of the information in 68,70Ni.

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Acknowledgements

Collaborators

NSCL: S. N. Liddick, C. J. Prokop, J. Chen, A. C. Dombos, N. Larson, R. Lewis, S. J. Quinn, and A. Spyrou,

ANL: A. D. Ayangeakaa, M. P. Carpenter, H. M. David, R. V. F. Janssens, T. Lauritsen, D. Seweryniak, and S. Zhu.

ARL: J. J. Carroll and C. J. Chiara UMD: J. Harker and W. B. Walters

Padova: F. Recchia UTK: M. Alshudifat, S. Go, R. Grzywacz LBL: S. Suchyta

Funding

This work was supported in part by the National Science Foundation (NSF) under Contract No. PHY-1102511 (NSCL) and Grant No. PHY-1350234 (CAREER), by the Department of Energy National Nuclear Security Administration (NNSA) under Award No. DE-NA0000979 and Grant No. DE-NA0002132, by the U.S Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-AC-06CH11357 (ANL) and Grant Nos. DE-FG02-94ER40834 (Maryland) and DE-FG02-96ER40983 (UT), and by the U.S. Army Research Laboratory under Cooperative Agreement W911NF-12-2-0019.


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