High-precision mass measurements of neutron-rich nuclei Dinko - - PowerPoint PPT Presentation

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High-precision mass measurements of neutron-rich nuclei Dinko - - PowerPoint PPT Presentation

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6 th Workshop on Nuclear Fission and Spectroscopy of Neutron-rich nuclei High-precision mass measurements of neutron-rich nuclei Dinko Atanasov Technische Universitaet Dresden Outline Motivation Ion-trap mass spectrometer ISOLTRAP

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SLIDE 1

High-precision mass measurements

  • f neutron-rich nuclei

Dinko Atanasov Technische Universitaet Dresden 6th Workshop on Nuclear Fission and Spectroscopy of Neutron-rich nuclei

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SLIDE 2
  • Motivation
  • Ion-trap mass spectrometer ISOLTRAP
  • Experimental techniques (TOF-ICR, MR-TOF MS, PI-ICR)
  • Results (neutron-rich Cd, Rb, Sr)

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Outline

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SLIDE 3

Mass surface

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SLIDE 4

Mass filters

132Sn region

A~100 region

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D2N = S2N(N,Z)-S2N(N +2,Z)= 2B Z, N

( )- B Z, N +2 ( )-B Z, N -2 ( )

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SLIDE 5

Radioactive ion-beam facility ISOLDE

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ISOLTRAP

PSB beam E = 1.4 GeV

CRIS IDS MINIBALL COLLAPS TAS

HRS GPS

REX-ISOLDE Low-energy ISOL beams post-accelerated ISOL beams

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SLIDE 6

ISOLTRAP setup

  • M. Mukherjee et al., Eur. Phys. J. A 35, 1 (2008); S. Kreim et al., Nucl. Instrum. Methods B 317, 492 (2013).

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SLIDE 7

Penning-trap mass spectrometry

  • M. KΓΆnig et al., IJMS. 142, 95 (1995); S. Eliseev, PRL 110, 082501

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Time-Of-Flight Ion-Cyclotron Resonance Phase-Imaging Ion-Cycotron Resonance

𝝃𝒅 = π‘ŸπΆ 2𝜌 𝒏

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SLIDE 8

Multi-Reflection Time-Of-Flight Mass Spectrometer

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𝒖 = 𝒃. 𝒏/𝒓 + 𝐜

  • R. N. Wolf et al., IJMS 313, 8 (2012); F.Wienholtz et al., Nature 489, 346 (2013)

Time-structure studies Yield studies

ungated gated

HFS studies

52Cr 52Ca 52K 39K

Mass measurements

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SLIDE 9

Mass measurements in the 132Sn region

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SLIDE 10

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  • Experimental data still missing for

important r-nuclei

  • Rely on theoretical extrapolations
  • Shell evolution far from stability puts

constraints on nuclear interaction used

Nuclear mass models - uncertainties

ISOLTRAP

  • R. Surmann ECT Workshop (2014), M. Mumpower et al. Prog. Part Nucl Phys, 86:86–126, 2016,
  • M. Wang et al., Chinese Phys. C 36, 1603 (2012); M. Bender et al., PRC 73, 034322 (2006); S. Goriely et al., PRC 88, 024308 (2013)

129-132Cd

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SLIDE 11
  • UCx target equipped with quartz insert
  • Masses determined by TOF-ICR and

MR-TOF MS measurements

Measurements of 129-131Cd+

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130Cd+ 131Cd+

  • D. Atanasov et al., PRL 115, 232501 (2015);

129Cd+

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SLIDE 12

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A Ratio r or CToF MEnew (keV) MEAME (keV) Ξ” (AME - new) (keV) 129 0.970 105 338(136) βˆ’63 148(74)

  • 63 510(200)#
  • 452

130 0.977 645 186(180) βˆ’61 118(22)

  • 61 530(160)
  • 412

131 0.482 304 4(539) βˆ’55 215(100)

  • 55 331(196)#
  • 116
  • D. Atanasov et al., PRL 115, 232501 (2015); M. Wang et al., Chinese Physics C 36, 1603 (2012).

Sn(N, Z) = B(N, Z) – B(N-1, Z) Ξ”n = Sn(N, Z) – Sn(N+1, Z)

Results

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SLIDE 13

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Isomeric states in 123,127Cd

ISOLTRAP (keV) AME12 (keV) Eex(123Cd) 149(50) 143(4) Eex(127Cd) 270(50) 0#(100#)

  • M. KΓΆnig et al., IJMS. 142, 95 (1995); S. Eliseev, PRL 110, 082501; A. Kankainen et al. PRC 87, 024307 (2013)
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SLIDE 14
  • M. KΓΆnig et al., IJMS. 142, 95 (1995); S. Eliseev, PRL 110, 082501; A. Kankainen et al. PRC 87, 024307 (2013)

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Isomeric states in 123,127Cd

85Rb

ISOLTRAP (keV) AME12 (keV) Eex(123Cd) 149(50) 143(4) Eex(127Cd) 270(50) 0#(100#)

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SLIDE 15

Mass measurements in the A β‰ˆ 100 region

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SLIDE 16
  • M. Wang et al., Chinese Physics C 36, 1603 (2012). V. Manea, PhD thesis (2014). A. de Roubin, article and thesis.

TITAN: R. Klawitter et al., Phys. Rev. C 93, 045807 (2016). T. R. Rodriguez, Phys. Rev. C 90, 034306 (2014)

Onset of deformation at N = 60

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SLIDE 17

101,102Sr, 98-100Rb, 98Kr measurements

  • S. Naimi et al., Phys. Rev. Lett. 105, 032502 (2010). P. Delahaye et al.,Phys. Rev. C 74, 034331 (2006).
  • V. Manea et al., Phys. Rev. C 88, 054322 (2013). A. de Roubin, article and thesis in preparation.

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  • Three campaigns in the A β‰ˆ 100

region during the last four years.

  • 101,102Sr, 98-100Rb, 97Kr measured

with Penning trap, 100-102Rb, 98Kr with MR-TOF MS.

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SLIDE 18
  • M. Wang et al., Chinese Physics C 36, 1603 (2012). V. Manea, PhD thesis (2014). A. de Roubin, article and thesis.

TITAN: R. Klawitter et al., Phys. Rev. C 93, 045807 (2016). T. R. Rodriguez, Phys. Rev. C 90, 034306 (2014)

Two-neutron Separation energies

  • New ISOLTRAP data continue the previous trends in the Sr and Rb chains.

More precise measurements in the Kr chain are needed.

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  • Beyond-mean-field calculations show that the Kr configurations don’t mix

strongly in the ground state.

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SLIDE 19

Acknowledgements

ISOLDE Target and Technical Group

Grants No.: 05P12HGCI1 05P12HGFNE

http://isoltrap.web.cern.ch Mikhail Goncharov, Achim Czasch

  • N. Althubiti, P. Ascher, G. Audi, D. Atanasov, D. Beck, K. Blaum, G. Bollen,
  • M. Breitenfeldt, R. B. Cakirli, T. Cocolios, S. Eliseev, S. George, F. Herfurth,
  • A. Herlert, J. Karthein, J. Kluge, M. Kowalska, S. Kreim, Yu. A. Litvinov,
  • D. Lunney, V. Manea, E. Minaya-Ramirez, M. Mougeot, D. Neidherr,
  • R. Ringle, M. Rosenbusch, A. de Roubin, L. Schweikhard, M. Wang,
  • A. Welker, F. Wienholtz, R. Wolf, K. Zuber