List of levels for 19C

The mass excess adopted by (2012Wa38) is 32.41 MeV 10. See also 1986Vi09, 1987Gi05, 1988Wo09, 1991Or01.

Halo nucleus:

The ¹⁹C nucleus has been suggested as a 1-neutron halo nucleus based on measurements of various reaction cross sections and momentum distributions of breakup products. See discussions in:

1989Sa10: E(¹⁹C)=45.12 MeV/nucleon, Cu target, σ_reaction=2.7 b 15.

1995Ba28: E(¹⁹C)≈77.2 MeV/nucleon, Be target, FWHM(¹⁸C parallel momentum dist)_lab=44 MeV/c 6.

1996Ma25: E(¹⁹C)=30.3 MeV/nucleon, Ta target, σ_1n=2.5 b 4, σ_{charge changing}=0.595 b 10, FWHM(n angular momentum dist)=42 MeV/c.

1998Ba28: E(¹⁹C)≈88 MeV/nucleon, Be and Ta targets, σ(Be)_1n=105 mb 17 and FWHM(¹⁸C parallel momentum dist)=42 MeV/c 4. σ(Ta)_1n=1.1 b 4 and FWHM(¹⁸C parallel momentum dist)=41 MeV/c 3.

1998Ba87: E(¹⁹C)≈910 MeV/nucleon, carbon target, FWHM(¹⁸C parallel momentum dist)=69 MeV/c 3. See (1999Sm01) who suggest the momentum distributions at different energies are affected by the low-lying excited state.

2001Co06: E(¹⁹C)≈910 MeV/nucleon, C and Pb targets, σ(C)_1n=233 mb 51 and σ(Pb)_1n=1967 mb 334. Evaluated relationship between S_1n and the S_1n separation energy. See also (2000Co31).

2001Oz03: E(¹⁹C)=960 MeV/nucleon, carbon target, σ_interaction=1231 mb 28, analyzed relation of σ_i to effective matter radius.

2009Na39: E(¹⁹C)=240 MeV/nucleon, carbon and lead targets, σ(C)_1n=132 mb 4 and σ(Pb)_1n=969 mb 34. Deduced σ_1n(Coulomb)=690 mb 70.

2016To10: E=307 MeV/nucleon, carbon target, σ_interaction=1.125|+0.025(stat)|+0.013(sys) b; find R^matter_rms=3.10^+0.05_-0.03 fm.

2001Ma08, 2001Ma21: E(¹⁹C)≈50 MeV/nucleon, ⁹Be target surrounded by 11 NaI detectors, σ_1n=264 mb 80 on ⁹Be, σ_1n=1.35 b 18 on Au. Deduced (56 9)% of 1n-removal events populate ¹⁸C_g.s. and measured a narrow ¹⁸C_g.s. parallel momentum distribution by gateing on events not in coincidence with γ rays. By considering the relationship between the parallel momentum distribution width and S_n they deduce S_n≈650 keV 150. Their analysis is found consistent only if Jπ(¹⁹C)=1/2⁺.

2010Ta04: E(¹⁹C)=40 MeV/nucleon, ¹H liquid hydrogen target, σ_R=754 mb 22, using the transmission method.

Analyses of the ¹⁹C nuclear halo properties are given in: (1995Gu07, 1998Ri02, 1999Sm01, 2000Ka36, 2002Ka34, 2005Na09, 2013Lu02); discussion on mainly heavy carbon nuclide halos is given in (2000Be58, 2009Ch45, 2011Fo18); and broader discussion on halo nuclei including ¹⁹C (1992La13, 1996Sh13, 1999La04, 2000Gu04, 2000Oz03, 2001Le21, 2001Lo20, 2003Li24, 2003Li31, 2004Ne16, 2010Gu15, 2011Al11, 2013Sh05, 2013Sh17, 2015Ha20, 2016Ya05). See also (1997Or03)

Theoretical analysis:

General theoretical analysis of the ¹⁹C structure properties is given in (2000Ba24, 2008Ka39, 2014La02); analysis of the carbon isotopes is given in (1996Re19, 1997Ka25, 1998Sh16, 2000De35, 2003Sa50, 2003Su09, 2003Th06, 2004Su23, 2004Ta31, 2006Le33, 2006Ta28, 2007Ma53, 2007Sa50, 2009Um05); and broader analyses of light nuclear properties including ¹⁹C are given in (1987Sa15, 1993Po11, 1996Su24, 1997Ba54, 1997Ho04, 2002Gu10, 2002Ka73, 2002Me12, 2003Le34, 2004La24, 2004Sa58, 2004Th11, 2005Sa63, 2006Ko02, 2007Do20, 2010Co05, 2012Yu07, 2013Sh05, 2014Ja14, 2015Sh21).

Q(β-)=1.656×10⁴ keV 10	S(n)= 580 keV 90	S(p)= 2.667×10⁴ keV 23	Q(α)= -1.984×10⁴ keV 19
Reference: 2017WA10

References:
A	¹H(¹⁹C,p’γ)	B	¹H(¹⁹C,¹⁸CN)
C	¹H(¹⁹C,X)	D	¹H(²⁰C,¹⁹CG)
E	⁹Be(²⁰N,¹⁹CG)	F	⁹Be(²²N,¹⁹C)
G	⁹Be(⁴⁰Ar,¹⁹C)	H	⁹Be(⁴⁸Ca,¹⁹C)
I	¹²C(¹⁹C,X)	J	¹²C(²²Ne,¹⁹C)
K	¹²C(²⁵Ne,¹⁹CG)	L	¹⁹B β^- decay
M	¹⁸¹Ta(⁴⁸Ca,¹⁹C)	N	¹⁸¹Ta(⁴⁰Ar,¹⁹C)
O	²⁰⁸Pb(¹⁹C,¹⁹C)	P	TH(p,¹⁹C)
Q	U(p,¹⁹C)	R	²⁴¹Pu(n,F) E=THERMAL

E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
0	A B C D E F G H I J K M N O P Q R	(1/2+)	46.3 ms 40 % β^- = 100 % β^-n = 47 3 % β^-2n = 7 3
209 2	A D E K	(3/2+)	1.34 ns 10	209 2	100	M1	0	(1/2+)
282 5 ?	A			72 4	100		209	(3/2+)
653 95	F	(5/2+)	< 100 keV % n ≈ 100
1.46E3 10	B	5/2+	0.29 MeV 2 % n ≈ 100

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Additional Data
209	(3/2+)	1.34 ns 10	209 2	M1	BM1=0.00321 25 (<a href= "http://www.nndc.bnl.gov/nsr/nsrlink.jsp?2015Wh02 ">2015Wh02</a>), B(M1)(W.u.)=0.00179 14 (<a href= "http://www.nndc.bnl.gov/nsr/nsrlink.jsp?2015Wh02 ">2015Wh02</a>)

E(level)	J^π(level)	T_1/2(level)	Comments
0	(1/2+)	46.3 ms 40 % β^- = 100 % β^-n = 47 3 % β^-2n = 7 3	Decay: Studies of the β-delayed neutron emission have been carried out in (1991Re02: β^-n=β_1n+2(β_2n)+3(β_3n)...=(53 26)%), (1995ReZZ/2008ReZZ: β^-n=(66 9)%), and (1988Du09: β_1n=(47 3)% and β_2n=(7 3)%. Analysis of β-γ coincidences indicate the β_1n decay populates ¹⁹N(6400,6508,7025), which subsequently neutron decay to ¹⁸B(115,587) see (1995Oz02). There is evidence for additional branches that β-2n decay to ¹⁷B with β-2n=(7 3)% (1988Du09). E(level): Decay: Studies of the β-delayed neutron emission have been carried out in (1991Re02: β^-n=β_1n+2(β_2n)+3(β_3n)...=(53 26)%), (1995ReZZ/2008ReZZ: β^-n=(66 9)%), and (1988Du09: β_1n=(47 3)% and β_2n=(7 3)%. Analysis of β-γ coincidences indicate the β_1n decay populates ¹⁹N(6400,6508,7025), which subsequently neutron decay to ¹⁸B(115,587) see (1995Oz02). There is evidence for additional branches that β-2n decay to ¹⁷B with β-2n=(7 3)% (1988Du09).
282			The Jπ of this state had initially been suggested as 5/2⁺ based on expectations from shell model analysis. In this case β₂=0.29 3; deduced from integrated experimental cross section for this state from 0\|’-1.7\|’ and distorted wave analysis (2005El07). However, subsequent observations and discussion in (2011Oz01, 2012Ko38, 2013Th06) support the notion that the first Jπ=5/2⁺ state must be unbound. E(level): The Jπ of this state had initially been suggested as 5/2⁺ based on expectations from shell model analysis. In this case β₂=0.29 3; deduced from integrated experimental cross section for this state from 0\|’-1.7\|’ and distorted wave analysis (2005El07). However, subsequent observations and discussion in (2011Oz01, 2012Ko38, 2013Th06) support the notion that the first Jπ=5/2⁺ state must be unbound.