Laser Spectroscopy at N = 20 and N = 40: Insights and Findings
Explore the fascinating world of laser spectroscopy at N = 20 and N = 40 as Jordan Reilly delves into the Island of Inversion, CRIS Technique, and more. Discover the implications of neutron-rich Al and the PI-LIST technique, shedding light on islands of inversion and the unique characteristics observed. Uncover the crossover at N = 21 and the significance of collinear resonance ionization spectroscopy in gaining model-independent measurements. Join the discussion on nuclear spin, magnetic dipole moment, electric quadrupole moment, and more. Dive deep into the realm of laser spectroscopy and its implications in the field of nuclear physics.
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Laser Spectroscopy at N = 20 and N = 40 Jordan Reilly INPC 2025 25/05/2025 30/05/2025 Daejeon, South Korea
Overview N = 20 Island of inversion Laser Spectroscopy The CRIS Technique Laser spectroscopy of neutron-rich Al Using PI-LIST to study neutron-rich Ni PI-LIST technique Conclusion Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 2 5 June 2025
[1] E. Caurier et al., Phys Rev C (90) 2014 Islands of inversion Increased correlation energy Reduced and weakened shell closures Np-nh excitations permit particles to reside in intruder states Strongly mixed G.S Collections of deformed isotopes referred to as islands of inversion (IoI) Emergence of IoI at N = 8, 20, 28, 40 & 50 (theorized) Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 3 5 June 2025
Figure taken from P. Himpe [4] Islands of inversion N = 20 signatures Strong closure at N = 20 Collapse of N = 20 Deviation from S.P Picture Suppressed E(2) values Increased radii Deviation from S.P picture Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 4 5 June 2025
N = 20 Island of inversion: Al S2n highlights a crossover at N = 21 not seen anywhere else but places 34Al outside IoI [1, 2] 34Al requires 50% G.S mixing to obtain ? [3, 4] >50% required to reproduce ?? [5] ????,? highlights a decreasing trend towards N = 20 [6] Further clarification is required to define the N = 20 IoI northern border! [1] A. A. Kwiatkowski et al., Phys Rev C (92) 2015 [2] A. T. Gallant et al., Phys. Rev. C (96) 2017 [3] P. Himpe et al,. Physics Letters B 643(5) 2006 [4] P. Himpe et al,. Physics Letters B 658(5) 2008 [5] H. Heylen et al., Phys Rev C (94) 2016 [6] H. Heylen et al., Phys Rev C (103) 2021 Only cross over observed in ?2?so far! Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 5 5 June 2025
???,? Laser Spectroscopy Access to model-independent measurements Nuclear spin ?? Magnetic dipole moment ? Electric quadrupole moment ?? Change in mean-square charge radii ????,? ???,? = ?? ???,? ? ??(?) ?? ????= ???? ??? ????= ??? + ??,? ? Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 6 5 June 2025
Collinear Resonance Ionisation Spectroscopy Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 7 5 June 2025
Laser spectroscopy of Neutron-rich Al 150 ions/s 34Al Two experimental campaigns technique Extracted ? consistent with ? - NMR 26-34Al measured using the CRIS 450 ions/s 33Al 26-31Al Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 8 5 June 2025
????,? of Neutron-rich Al Further discussions with theorists and interpretation of the results are ongoing! Mg: D. Yordanov et al., Phys. Rev. Lett. 108 2012. Na: B. Ohayon et al., Phys. Rev. C 105 2022 Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 9 5 June 2025
Laser Spec of neutron-rich Ni Closed proton shell (Z = 28) Isotopic chain spans across N = 40 & 50 Z > 28 (Cu, Zn, Ga) extensively studied with laser spectroscopy up to N = 50 ? and ?? measured up to 67Ni [1] ? ?2 ?,? measured for 58-68,70Ni [2] Investigate possible enhancement of collectivity and weakening of Z = 28 leading towards 74Ni [3] as neutrons populate ?9/2, shown by steep increase in B(E2) [4] Experiment scheduled for Autumn 2025! [1] P. Muller et al., Physics Letters B, 854:138737, 2024. [2] S. Malbrunot-Ettenauer et al., Phys. Rev. Lett., 128:022502, 2022. [3] N. Aoi et al., Physics Letters B,692(5) 2010. [4] O. Perru et al., Phys. Rev. Lett., 96:232501 2006. Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 10 5 June 2025
PI-LIST Tab provided by Reinhard Mass (amu) WL (nm) Temp. (C) Doppler (MHz) FWHM (MHz) Opt? # LIST type Fraction PI-LIST typically deployed in heavy- mass region Large HFS splittings and isotope shifts are favourable due to limited resolution (~100s MHz) Ni in a region of overwhelming Ga contamination (104:1) LIST suppression + highly-sensitive detection methods New laser ionisation scheme, > x 5 more efficient 1 Tc 99 430 1700JGU 98yes 2230 4% 2 Ho 165 410 1000JGU 104yes 1455 7% JGU mirror 3 Ho 165 410 1000 114yes 1455 8% 4 U 238 830 1700JGU 60yes 745 8% JGU mirror 5 Rb 87 780 300 62yes 707 9% 6 Ac 225 418 1500JGU 1442 14% 200 7 Pm 145 452 1500JGU 1661 9% 150 8 Cf 250 417 800JGU 55yes 1067 5% 9 Ac 227 439 2000ISOLDE 200yes 1548 13% Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 11 5 June 2025
[1] R. Heinke et al., high-resolution in-source laser spectroscopy in perpendicular geometry: Development and application of the pi-list. Hyperfine Interactions, 238, 12 2016. PI-LIST Technique Tab from [1] 104:1 ratio of 70Ga:70Ni, major obstacle in the past LIST x106 surface ion suppression, sacrifice x102 ion of interest Perpendicular illumination permits Doppler Broadening suppression Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 12 5 June 2025
PI-LIST Detection Single ion counting! ? Gating Isomer & G.S. Separation in a single scan! Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 13 5 June 2025
Laser Spectroscopy of Pm (Last week!) Laser spectroscopy performed 149-143Pm, 141-136Pm Decay assisted laser spectroscopy performed on 137- 135Pm New decay data on 138-135Pm Hyperfine structure probed with a resolution of ~450 MHz Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 14 5 June 2025
Summary 26-34Al measured Neutron-rich Ni experiment planned for Autumn 2025 Deploying PI-LIST in medium-mass region Opening avenues for future medium/light- mass cases Successful campaign to study 134-149Pm Isotope shifts indicate increasing trend towards and across N = 20 Similar trends observed in Mg and Na Theoretical calculations underestimate experimental observation Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 15 5 June 2025
Thank you for listening! Special Thank you to: CRIS Collaboration J. R. Reilly, . Koszor s, M. Athanasakis-Kaklamanakis, Y. Balasmeh, C. Bernerd, M. L. Bissell, K. Chrysalidis, T. E. Cocolios, R. P. de Groote, A. Dorne, M. Duggan, K. T. Flanagan, R. F. Garcia Ruiz, R. Heinke, D. Hanstorp, J. D. Johnson, J. Karthein, S. Kujanp , L. Lalanne, Y. C. Liu, Y. S. Liu, K. Lynch, G. Neyens, M. Nichols, A. McGlone, J. Trujillo, B. van den Borne, A. R. Vernon, J. Warbinek, S. G. Wilkins, J. Wessolek, X. F. Yang PI-LIST J. R. Reilly, A. Ajayakumar, A. N. Andreyev, M. Au, J. Berbalk, C. Bernerd, J. G. Cubiss, K. Chrysalidis, V. Fedoseev, A. A. H. Jaradat, D. McElroy, D. Lange, K. M. Lynch, R. Heinke, A. Schmidt, C. Schweiger, J. Wessolek, J. Wilson Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 16 5 June 2025
Thank you for listening! Questions? Conclusion 26-34Al measured Neutron-rich Ni experiment planned for Autumn 2025 Successful campaign to study 134-149Pm E/M moments and IS to be extracted Isotope shifts indicate increasing trend towards and across N = 20 Similar trends observed in Mg and Na Theoretical calculations underestimate experimental observation Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 17 5 June 2025
Back Up Slides Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 18 5 June 2025
Shape transition near Z = 62 Abrupt change from spherical to deformed in Tb, Gd, Eu and Sm iOES in Eu indicate the signature of octupole deformation HFB and FRDM calculations indicate a large jump in deformation close to p-dripline Pm is transitional between the smooth to abrupt jump at N = 88-90 Rapid change at N = 75 Smooth transition from spherical to deformed in Nd, Ce and Ba Tentative spin assignments for even-Pm isotopes Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 19 5 June 2025
[1] N. Aoi et al., Physics Letters B,692(5) 2010. [2] O. Perru et al., Phys. Rev. Lett., 96:232501 2006. Laser spectroscopy of neutron-rich Ni Enhancement of collectivity and weakening of Z = 28 as neutrons populate ?9/2 beyond N = 40 Investigate possible enhancement of collectivity leading towards 74Ni [1] Weakening of the Z = 28 shell closure Steep increase in B(E2) between N = 40 to 42 [2] ?,??,? ???,? measurements crucial in mid-shell region to understand development of collectivity Experiment scheduled for Autumn 2025! Jordan Reilly | Laser spectroscopy at N = 20 and N = 40 20 5 June 2025
