Spectroscopy of 252No to Investigate its K-isomer
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1 Spectroscopy of to Investigate its K-isomer Edward Parr
2 Motivation in Superheavies PROTONS Single Particle Energy (MeV) Single Particle Energy (MeV) NEUTRONS Next shell gaps predicted for Superheavy spherical nuclei Quadrupole Deformation ( 2) Cross section to produce these nuclei is too low Quadrupole Deformation ( 2)
3 Motivation in Superheavies PROTONS Single Particle Energy (MeV) Single Particle Energy (MeV) NEUTRONS Quadrupole Deformation ( 2) Cross section to produce these nuclei is too low Quadrupole Deformation ( 2)
4 Motivation in Superheavies PROTONS Single Particle Energy (MeV) Single Particle Energy (MeV) NEUTRONS Deformed shell gaps for transfermium nuclei Quadrupole Deformation ( 2) Quadrupole Deformation ( 2) Cross sections of nb b, production is experimentally viable 0.3
5 K-Isomers of nuclei J R nuclear symmetry axis Total spin of a nucleus I has rotational component R and single particle contribution J
6 K-Isomers of nuclei I nuclear symmetry axis k Total spin of a nucleus I has rotational component R and single particle contribution J I has projection k onto symmetry axis of nucleus
7 K-Isomers of nuclei I k k-isomer state I k decayed state A large change in k will inhibit the decay giving a relatively long lived K-isomer state
8 K-Isomer particle states Excitation Energy (kev) Fm Theoretical results of energy levels in this region conflict
9 Excitation Energy (kev) K-Isomer particle states 1600 Proton excitation 1400 π[514]7/2- π[624]9/2+ Neutron excitation [734]9/2- [624]7/2+ [734]9/2- [624]7/ Fm Theoretical results of energy levels in this region conflict Study K-isomer structures to infer single particle excitations into these levels
10 Experimental Setup Experiment took place at Jyväskylä in Finland Beam Energy = 218MeV JUROGAM target array RITU separator 48 Ca Beam GREAT focal plane array Fusion evaporation reaction; Pb( Ca, 2n)
11 Recoil-Decay Tagging Counts Energy loss (kev) Raw JUROGAM Spectra Time of flight (10ns) Identifying recoils entering gas detector Energy (kev)
12 Recoil-tagged Spectra Counts Energy loss (kev) Recoil-Decay Tagging Energy (kev) Time of flight (10ns) Identifying recoils entering gas detector Gate on events in region of 2D histogram to identify
13 Identifying Decay Events 248 Fm 244 Cf 244 Cf 248 Fm Counts SF -s.f. 253 DSSSD-y Energy (MeV) Then select gated recoils which decay at focal plane with alpha energies or spontaneous fission
14 Ground State Rotational Band Counts Recoil tagged Recoil-Decay tagged Energy (kev) events were identified and in-beam spectra taken at target position
15 Ground State Rotational Band tagged + ( ) (14 12 ) ( ) ( ) (8+ 6+) Recoil-Decay + + (10 8 ) (6+ 4+) ( ) (6) Counts Recoil tagged Energy (kev) Harris model used to fit lower order transitions 453.3(4) 415.6(3) 373.8(5) 328.0(2) 277.6(2) (2) (2) (1) 46.5(1)
16 Recoil-Decay Tagged Isomeric Events Counts conversion electron spectrum DSSSD-x Energy (kev) Lower transitions are highly converted B. Sulignano, et al. Isomeric recoils decay at focal plane conversion electrons paired with RDT events to identify isomeric recoils
17 Half-life of - 8 K-Isomer Decays T1/2 = (29) ms Time (ms) Time between recoil implantation and isomeric decay found Half life found consistent with previous: T1/2 = 110(10)ms
18 - 8 K-Isomer Rotational Band Counts Pb Energy (kev) In-beam spectra of isomer events give prompt gamma at target position
19 - 8 K-Isomer Rotational Band 15- E2 (10-8-) (13-11-) (11-9-) 314 (gs transition) 247 (12-10-) (15-13-) Counts M (11 10 ) (12-11-) Pb Energy (kev) K-Isomer In-beam spectra of isomer events give prompt gamma at target position See rotational band built on K-isomer
20 Comparisons with Dynamic MOI vs angular frequency squared gs bands 2- bands 250 Fm Spin (ħ) Fm ℑ(2) (ħ2/mev) Energy (MeV) Energy vs Spin Fm 8- band 8- band 2 (MeV2/ħ2) Comparing rotational band with similarly structured 250Fm
21 Comparisons with 8- bands Dynamic MOI vs angular frequency squared gs bands 2- bands 250 Fm Spin (ħ) Fm ℑ(2) (ħ2/mev) Energy (MeV) Energy vs Spin Fm 8- band 8- band 2 (MeV2/ħ2) Comparing rotational band with similarly structured 250Fm
22 Configuration of K-Isomer Excitation Energy (kev) 1600 Proton excitation Neutron excitation? ( [734]9/2- [624]7/2+) Fm Use M1/E2 branching ratios to unambiguously assign a configuration to K-isomer
23 Collaborators P.T. Greenlees, M. Leino, U. Jakobsson, P. Jones, R. Julin, S. Juutinen, S. Ketelhut, H. Kettunen, M. Nyman, P. Rahkila, J. Saren, C. Scholey, J. Sorri and J. Uusitalo Department of Physics, University of Jyväskylä, Finland R.-D. Herzberg, P.A. Butler, J. Pakarinen, D. Rostron, P. Papadakis, E. Parr Department of Physics, University of Liverpool B. Sulignano, Ch. Theisen, A. Drouart, A. Görgen, W. Korten, J. Ljungvall, A. Obertelli and M. Zielińska DAPNIA/SPhN CEA-Saclay, France B. S. Hofmann, D. Ackermann, F.P. Heßberger, S. Heinz and J. Khuyagbataar GSI, Darmstadt, Germany S u M. Venhart, S. Antalic l Department of Nuclear Physics and Biophysics, Comenius University, Bratislava, Slovakia i g n a n o,
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