ADOPTED LEVELS, GAMMAS for 26P

Authors: M.S. Basunia and A.M. Hurst |  Citation: Nucl. Data Sheets 134, 1 (2016) |  Cutoff date: 1-Feb-2016 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-16110 keV SYS(n)= 16840 keV SYS(p)= 140 keV SYQ(α)= -9650 keV SY
Reference: 2012WA38

References:
  A  C(28Si,X) 

General Comments:

2004Th09: 26P isotope produced in fragmentation of 36Ar18+ ions at E=95 MeV/nucleon on a 357.1-mg/cm2 12C production target at the GANIL facility. Fragment separation with LISE3 spectrometer; ions implanted in a stacked silicon detector and identified through their tof. Measured Eγ, E(p), Jπ, I(p), Iγ, γγ, γβ coin, pβ coin, pγβ coin, half-life using one segmented Ge clover detector and five stacked Si detectors.

1983Ca06 (also 1984Ca29, 1984CaZV thesis): 26P produced and identified in 28Si(3He,p4n) reaction at E=110-130 MeV with intensities 3-7 μA from the 88-Inch Cyclotron of the Lawrence Berkeley National Laboratory. Beta-delayed protons measured using a 3-element ΔE-ΔE-E silicon telescope. Measured beta-delayed two-proton pp-coin, E(p), half-life, %εp, %ε2p.

1983Ho23: 26P produced in 28Si(3He,p4n) using E(3He)=110 MeV with intensity of 3-7 μA from the 88-Inch Cyclotron at the Lawrence Berkeley National Laboratory. Measured β delayed protons using three-element ΔE-ΔE-E silicon telescope. α two-proton group at 4.914 MeV assigned to decay of 24Mg ground state following superallowed β decay of 26P to analogue t=2 state in 26Si. Deduced 2p/1p ratio.

1998Na34: 9Be(26P,p25Si),E≈65 MeV/nucleon and projectile momentum spread of 0.5%. 26P produced via fragmentation of a 100 MeV/nucleon primary 36Ar beam on a 470-mg/cm2 Be production target and selected using the A1200 fragment separator at the National Superconducting Cyclotron Laboratory (NSCL). Two x/y position-sensitive cathode-readout drift chambers recorded momentum and angle information of projectile-residue fragments produced in one-proton removal on a 14-mg/cm2 Be breakup target at focal plane of S800 superconducting spectrograph. Coincident γ rays with breakup events measured using a 38-detector NaI(Tl) array surrounding the target chamber. Measured Eγ, (residue)γ-coin; reconstructed momentum distributions using ion-optics code COSY, deduced proton-halo structure in 26P.

Q-value: Estimated uncertainties (2012Wa38): 630 for Q(β-), 450 for S(n) and Q(α), 200 for S(p)

Q-value: S(2n)=38490 540, S(2p)=3560 200, Q(εp)=12600 200 (syst, 2012Wa38)








E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)
    0.0A (3)+ 43.7 ms 6 
% ε = 100
% εp = 36.8 20
% EC2P = 2.16 24
% εα = 0
  
  164.4 1 A 120 ns 9    164.4 1 
  100

Back to top

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
    0.0(3)+ 43.7 ms 6 
% ε = 100
% εp = 36.8 20
% EC2P = 2.16 24
% εα = 0
T=2
Total branch for the proton-unbound levels is measured as 39% 2; and %ε2p is measured as 2.16 24 (2004Th09); from which %εp=36.8 20. Other measurement: %εp branch to t=2 analogue state ≈1.9% (1984Ca29, 1983Ca06, 1984CaZV thesis); who also estimated 2p/1p ratio for the decay of IAS as ≈1 to within 50% (2p/1p≈1.5 within a factor of two in 1983Ho23). Corresponding εp branch in 2004Th09 is 5.3% 4, and 2p/1p=0.69 9.
E(level): Total branch for the proton-unbound levels is measured as 39% 2; and %ε2p is measured as 2.16 24 (2004Th09); from which %εp=36.8 20. Other measurement: %εp branch to t=2 analogue state ≈1.9% (1984Ca29, 1983Ca06, 1984CaZV thesis); who also estimated 2p/1p ratio for the decay of IAS as ≈1 to within 50% (2p/1p≈1.5 within a factor of two in 1983Ho23). Corresponding εp branch in 2004Th09 is 5.3% 4, and 2p/1p=0.69 9.

Back to top