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Studies of Heavy Pear-shaped Nuclei / Butler, P A (Liverpool U.)
For certain combinations of protons and neutrons it is expected that the shape of atomic nuclei can undergo octupole deformation, which would give rise to reflection asymmetry or a “pear shape”. Here it is described how recent experiments carried out at CERN using REX-ISOLDE and HIE-ISOLDE and the Miniball gamma-ray spectrometer have provided evidence that several radium and radon isotopes have either stable pear shapes or are octupole vibrational in nature. [...]
2023 - 8 p. - Published in : J. Phys. : Conf. Ser.: 2453 (2023) , no. 1, pp. 012001
Fulltext: PDF;
In : 13th International Spring Seminar on Nuclear Physics: Perspectives and Challenges in Nuclear Structure after 70 Years of Shell Model (ISS2022), Sant’Angelo d’Ischia, Italy, 14 - 20 Apr 2022, pp.012001

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(91)

Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive $^{222}\mathrm{Ra}$ and $^{228}\mathrm{Ra}$ Beams / Butler, P.A. (U. Liverpool (main)) ; Gaffney, L.P. (U. Liverpool (main) ; CERN) ; Spagnoletti, P. (Paisley U.) ; Abrahams, K. (Western Cape U.) ; Bowry, M. (Paisley U. ; TRIUMF) ; Cederkäll, J. (Lund U.) ; de Angelis, G. (INFN, Legnaro) ; De Witte, H. (Leuven U.) ; Garrett, P.E. (Guelph U.) ; Goldkuhle, A. (Cologne U.) et al.
There is sparse direct experimental evidence that atomic nuclei can exhibit stable pear shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole ($E3$) matrix elements have been determined for transitions in $^{222,228}$Ra nuclei using the method of sub-barrier, multi-step Coulomb excitation. [...]
arXiv:2001.09681.- 2020-02-01 - 6 p. - Published in : Phys. Rev. Lett. 124 (2020) 042503 Fulltext: PDF; Fulltext from publisher: PDF;

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(91)

Studies of the shapes of heavy nuclei at ISOLDE / Butler, Peter A (Liverpool U.)
For certain combinations of protons and neutrons there is a theoretical expectation that the shape of nuclei can assume octupole deformation, which would give rise to reflection asymmetry or a “pear-shape” in the intrinsic frame, either dynamically (octupole vibrations) or statically (permanent octupole deformation). In this talk I will briefly review the historic evidence for reflection asymmetry in nuclei and describe how recent experiments carried out at REX-ISOLDE have constrained nuclear theory and how they contribute to tests of extensions of the Standard Model. [...]
2015 - 7 p. - Published in : JPS Conf. Proc. 6 (2015) 010017
In : 2nd Conference on Advances in Radioactive Isotope Science, Tokyo, Japan, 1 - 6 Jun 2014, pp.010017

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(68)

Coulomb excitation of pear-shaped nuclei / Butler, Peter (Liverpool U.) ; Gaffney, Liam (Liverpool U. ; CERN) ; Spagnoletti, Pietro (West Scotland U.) ; Konki, Joonas (CERN) ; Scheck, Marcus (West Scotland U.) ; Smith, John (West Scotland U.) ; Abrahams, Kenzo (Western Cape U.) ; Bowry, Michael (TRIUMF) ; Cederkäll, Joakim (Lund U.) ; Chupp, Timothy (Michigan U.) et al.
There is a large body of evidence that atomic nuclei can undergo octupole distortion and assume the shape of a pear. This phenomenon is important for measurements of electric-dipole moments of atoms, which would indicate CP violation and hence probe physics beyond the Standard Model of particle physics. [...]
2019 - 5 p. - Published in : EPJ Web Conf. 223 (2019) 01007 Fulltext: PDF;
In : IV International Conference on Nuclear Structure and Dynamics (NSD2019), Venice, Italy, 13 -17 May 2019, pp.01007

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(65)

Nuclear-structure studies of exotic nuclei with MINIBALL / Butler, P A (Liverpool U.) ; Cederkall, J (Lund U.) ; Reiter, P (Cologne U.)
High-resolution γ-ray spectroscopy has been established at ISOLDE for nuclear-structure and nuclear-reaction studies with reaccelerated radioactive ion beams provided by the REX-ISOLDE facility. The MINIBALL spectrometer comprises 24 six-fold segmented, encapsulated high-purity germanium crystals. [...]
2017 - 23 p. - Published in : J. Phys. G 44 (2017) 044012 Fulltext: PDF;

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(61)

Hyperdeformed pear-shaped nuclei / Blons, J ; Paya, D
SACLAY-DPHN-2563. - 1989. - 11 p.
CERN library copies

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(50)

The observation of vibrating pear-shapes in radon nuclei / Butler, P.A. (Liverpool U.) ; Gaffney, L.P. (Liverpool U. ; CERN) ; Spagnoletti, P. (West Scotland U.) ; Konki, J. (CERN) ; Scheck, M. (West Scotland U.) ; Smith, J.F. (West Scotland U.) ; Abrahams, K. (Western Cape U.) ; Bowry, M. (TRIUMF) ; Cederkäll, J. (Lund U.) ; Chupp, T. (Michigan U.) et al.
There is a large body of evidence that atomic nuclei can undergo octupole distortion and assume the shape of a pear. This phenomenon is important for measurements of electric-dipole moments of atoms, which would indicate CP violation and hence probe physics beyond the standard model of particle physics. [...]
arXiv:2003.10147.- 2019-06-06 - 6 p. - Published in : Nature Commun. 10 (2019) 2473 Fulltext: 2003.10147 - PDF; 7a6aa522dd658653207485bc1ee38876 - PDF; s41467-019-10494-5 - PDF;

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(42)

HIE-LINAC and Beam lines for HIE-ISOLDE experiments / Pasini, M
The documents gives a brief description of the upgrade of the present REX-ISOLDE linac with a proposal for two possible solutions for the beam lines at high energy..
HIE-ISOLDE-PROJECT-Note-0003 ; CERN-HIE-ISOLDE-PROJECT-Note-0003. - 2008. - 15 p.
Full text

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(41)

HIE-ISOLDE / Lindroos, M (CERN) ; Butler, P A (Liverpool U.) ; Huyse, M (Leuven U) ; Riisager, K (CERN)
2008 - Published in : Nucl. Instrum. Methods Phys. Res., B 266 (2008) 4687-4691

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(39)

Studies of pear-shaped nuclei using accelerated radioactive beams / Gaffney, L P (Liverpool U.) ; Butler, P A (Liverpool U.) ; Scheck, M (Liverpool U. ; Darmstadt, Tech. Hochsch.) ; Hayes, A B (Rochester U.) ; Wenander, F (CERN) ; Albers, M (Cologne U.) ; Bastin, B (GANIL) ; Bauer, C (Darmstadt, Tech. Hochsch.) ; Blazhev, A (Cologne U.) ; Bonig, S (Darmstadt, Tech. Hochsch.) et al.
There is strong circumstantial evidence that certain heavy, unstable atomic nuclei are ‘octupole deformed’, that is, distorted into a pear shape. This contrasts with the more prevalent rugby-ball shape of nuclei with reflection-symmetric, quadrupole deformations. [...]
2013 - Published in : Nature 497 (2013) 199-204

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