ADOPTED LEVELS for 265Rf

Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 31-OCT-2015 

Authors: R.B. Firestone, and J. Gilat |  Citation: Nucl. Data Sheets 90,269 (2000) |  Cutoff date: 1-Apr-2000 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-1800 keV SYS(n)= 5460 keV SYS(p)= 4980 keV SYQ(α)= 7810 keV SY
Reference: 2012WA38

References:
  A  269Sg α decay (3.1 M) 

General Comments:

265Rf produced in the α-decay chain of 285Fl nuclide (2010El06,2015Ut02): 285Fl --> 281Cn --> 277Ds --> 273Hs --> 269Sg --> 265Rf

2010El06: identification of 265Rf nuclide in the α-decay chain of 285Fl nuclide produced in 242Pu(48Ca,5n) at E=256 MeV from LBNL cyclotron facility. Evaporation residues were separated by BGS based on magnetic rigidities. Signals from multiwire proportional counters (MWPC) and focal plane detector (FPD) were used to distinguish implantation events from radioactive decay events in the FPD. Z=114 events were identified by detecting time and position correlated events corresponding to their implantation and subsequent radioactive decay chain terminating in SF decay of 265Rf

2015Ut02: 285Fl produced in 240Pu(48Ca,3n),E=245,250 MeV at U400 cyclotron of FLNR-JINR facility. Targets=240Pu enriched to 98.97% at ORNL facility, and 92% enriched at JINR facility, with average thickness of 0.39 mg/cm2 4 for mixed ORNL/JINR 240Pu material. Evaporation residues (ERs) were separated from the incident beam ions, scattered particles, and transfer reaction products by the DGFRS based on magnetic rigidities. Recoils passed through a tof system of two multiwire proportional counters (MWPCs), and were implanted in the DSSD detector system (0.3-mm thick double-sided silicon strip detectors) placed at the final focus of the DGFRS. Events related to Z=114 were identified by detecting time and position correlated events corresponding to their implantation and subsequent α-decay chain terminating in SF decay.

The data of 1999Ni03 reporting α-decay chain of 293118 leading to the nuclide 265Rf, and cited in earlier Nuclear Data Sheets evaluation of 2000Fi12 have since been retracted (2002Ni10), and have not been confirmed in an independent experiment at LBNL (2003Gr26)

Q-value: Estimated uncertainties (2012Wa38): 420 for Q(β-), 510 for S(n), 570 for S(p), 300 for Q(α)

Q-value: S(2n)=12240 400, S(2p)=9020 610 (syst,2012Wa38)





E(level)
(keV)
XREF T1/2(level)
  0A 1.0 m +12-3 
% SF ≈ 100

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments

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