12C 12N B+ DECAY:11.000 MS 1981Ka31,2009Hy01 18NPA 201808
12C H TYP=FUL$AUT=J.H. KELLEY, J.E. Purcell and C.G. SHEU$
12C 2 H CIT=NP A968, 71 (2017)$CUT=1-Jan-2017$
12C c 1972Al31: {+12}N, measured |b|g-coin. Deduced log| {Ift}, |b-branching.
12C c 1974Mc11: {+12}N,measured E{-|b}, I{-|b}, |b|g-coin. Deduced log|
12C xc {Ift}.
12C c 1978Al01: {+12}N,measured E{-|b}, I{-|b}, |b|g-coin, T{-1/2}. Deduced
12C 2c |b-branching, mirror asymmetries, {Ift}.
12C c 1981Ka31: {+12}N, measured |b|g-coin, |b|g(t). Deduced I{-|b}, log|
12C xc {Ift}.
12C c 1988Na09: {+12}N, measured I{-|b}, I{-|g}, |b|g-coin. Deduced mirror
12C 2c asymmetry. {+12}B, {+12}N deduced Gamow-Teller |b-decay branching
12C xc ratio.
12C c 1990Ca10: {+12}N(|b{++}), measured spectral shape factors.
12C c 1991Li32: {+12}N, measured |b-decay asymmetry.
12C c 1993Mi32: {+12}N(|b{++}), measured I{-|b}(|q). Deduced alignment
12C 2c coefficients.
12C c 1998Mi14: {+12}N(|b{++}), measured |b-ray angular distribution from
12C 2c oriented nuclei.
12C c 1998Se04: {+12}N(|b{++}), measured |b{++} polarization asymmetry from
12C 2c decay of polarized nuclei.
12C c 1999Mi41,2000Mi11: {+12}N(|b{++}), measured E{-|b}, I{-|b}(|q) from
12C 2c aligned nuclei.
12C c 2001Th18: {+12}N(|b{++}), measured positrons longitudinal polarization
12C 2c following decay.
12C c 2002BoZY: {+12}N(|b{++}p), analyzed |b-delayed multi-particle emission
12C 2c data. Deduced branching ratios, decay mechanism features.
12C c 2002Fy02,2003Fy02,2003Fy04,2004Fy02,2004Fy03: {+12}N(EC), measured
12C 2c |b-delayed E{-|a}, |a|a-coin. {+12}C level deduced three-body decay
12C 3c mechanism, excited states.
12C c 2002Mi01,2002Mi03,2002Mi36,2002Mi49,2003Mi24: {+12}N(|b{++}), measured
12C 2c E{-|b}, angular distributions from spin-aligned sources.
12C c 2004Bo43: {+12}N(|b{++}), measured |b-delayed particle spectra, yields.
12C 2c {+12}C deduced excited states particle-decay features.
12C c 2009Di06: {+12}N(|b{++}), measured E{-|a}, E{-|g}, |a|a|a-coin. {+12}C
12C 2c deduced levels, J, |p, triple-|a continuum states and their decay
12C 3c modes. R-matrix analysis.
12C c 2009Hy01,2009Hy02,2010Hy01: {+12}N(|b{++}), measured E{-|a}, I{-|a},
12C 2c E{-|g}, I{-|g}, E{-|b}, |b|g-, |b|a-, |a|a|a-coin. {+12}C deduced
12C 3c levels, |b feedings, and log| {Ift}.
12C c The authors performed two measurements of {+12}N decay into |a
12C 2c unbound states of {+12}C using two different techniques.
12C 3c In addition {+12}B decay was also measured.
12C 4c The first method involved implantation of {+12}N into a thin carbon
12C 5c foil located in the center of a large solid angle
12C 6c Si Strip array (at IGSOL/JYFL)
12C 7c that measured breakup |a particle kinematics;
12C 8c a HPGe detector mesured
12C 9c the {+12}C*(4.44 MeV) de-excitation gamma-rays, and the measurement
12C Ac was normalized to the value presently adopted in ENSDF.
12C Bc The second method involved implantation of {+12}N into
12C Cc a thick Si detector (at TRIuP/KVI) and measuring
12C Dc the total 3|a decay energy.
12C c (2009Hy02) gives details of the JYFL measurement, while (2009Hy01)
12C 2c is reported as giving the most precise analysis of the KVI and JYFL
12C 3c measurements.
12C c (2010Hy01) gives a detailed multi-channel multi-level R-matrix analysis
12C 2c of 0+ and 2+ levels above the E{-x}=7.65 MeV level that may contribute
12C 3c to the shape of the 3|a energy spectrum observed in {+12}B and {+12}N
12C 4c decay to {+12}C. The analysis focuses mainly on these higher-lying
12C 5c state and is difficult to fold in with the analysis given in
12C 6c (2009Hy01,2009Hy02). A significant difference from the prior work is
12C 7c the assumption that the E{-x}=10.3 MeV bump (J{+|p}=0+) is from
12C 8c interference; they suggest instead the J{+|p}=0{++}{-3} state at
12C 9c E{-x}=11.2 MeV {I3} with |G=1.5 MeV {I6}.
12C cL J,T From adopted levels
12C cG E From adopted gammas
12N P 0.0 1+ 11.000 MS 16 17338.1 10
12N cP QP$From (2017Wa10)
12N cP J,T$From adopted levels for {+12}N in ENSDF database
12C N 1.0 1.0 1.0
12C PN 4
12C L 0 0+
12C E 96.17 5 4.1106 7 96.17 5
12C S E EAV=7922.87
12C cE IE unity minus the sum of branching to higher
12C 2cE states. See discussion in (2017Ke05) Table 12.42.
12C L 4439.82 312+ 10.8E-3 EV6
12C E 1.898 32 5.148 8 1.898 32
12C S E EAV=5711.13
12C cE IE I|b(4440) is used as a global normalization
12C 2cE in most measurements.
12C cE IE We adopt I|b=1.898 {I32} from (1981Ka31) since the
12C 2cE experimental approach
12C 3cE aimed to overcome most systematic effects that influence the value.
12C 4cE For other values see Table 12.23 in (2017Ke05).
12C G 4438.91 1.90 3
12C 2 G FL=0
12C L 7654.07 190+ 9.3 EV 9
12C E 1.41 3 4.622 10 1.41 3
12C S E EAV=4113.48 51
12C cE IE from (KVI) in (2009Hy01). See other values in
12C 2cE Table 12.42 of (2017Ke05).
12C G 3213.8 5.9E-4 2
12C 2 G FL=4439.82
12C cG RI$From |G|g/|G=(4.16 {I11})|*10{+-4} and
12C 2cG I|b=(1.41 {I3})%.
12C L 10.3E+3 3(0+) 3.0 MEV 7
12C E 0.403 9 4.42 11 0.403 9
12C S E EAV=2.80E3 15
12C cE IE From weighted average of 0.38 {I5} (JYFL)
12C 2cE and 0.404 {I9} (KVI). In (2009Hy01) this is listed as
12C 3cE the sum of feeding to E{-x}=9-12 MeV.
12C 4cE See discussion in Table 12.42 in (2017Ke05).
12C cE In (2010Hy01) the authors indicate that the J{+|p}=0{++}{-3}
12C 2cE resonance has parameters E{-x}=11.2 MeV {I3} with |G=1.5 MeV {I6},
12C 3cE suggesting that the previously observed E{-x}=10.3 MeV bump results
12C 4cE from interference. They further indicate that the J{+|p}=2{++}{-2}
12C 5cE resonance has parameters E{-x}=11.1 MeV {I3} and |G=1.4 MeV {I4}. In
12C 6cE addition, for these two states (2010Hy01) find B(>)=0.06 {I2} and
12C 7cE B(>)=0.05 {I3} (log| {Ift}=4.82 {I18} and log| {Ift}=4.90 {I40}) for
12C 8cE the J{+|p}=0{++}{-3} and 2{++}{-2} states, respectively.
12C L 12710 1+ 18.1 EV 28
12C E 0.120 3 3.924 11 0.120 3
12C S E EAV=1624.94 49
12C cE IE Mainly from the KVI data in (2009Hy01). See other values in
12C 2cE Table 12.42 of (2017Ke05).
12C L 15110 1+ 43.6 EV 10
12C E 0.0023 15 4.E-6 3 3.6 3 2.3E-3 15
12C S E EAV=495.21 45$CK=0.001824 5$CL=0.0001020 3$
12C cE IE From average of (2009Hy01) and (1967Al03)
12C 2cE See discussion in Table 12.42 of (2017Ke05).