List of levels for 247CF

Author: C. D. Nesaraja | Citation: Nucl. Data Sheets 125, 395 (2015) | Cutoff date: 31-Mar-2014

Identification:

1956Ch77: Determined ²⁴⁴Cm(α,n) excitation function 1954Gh12: ²⁴⁷Cf produced by irradiating ²³⁸U with ¹⁴N ions

at the Berkeley Crocker Laboratory 60 inch cyclotron. It was then followed by chemical separation. Measured half-life≈2.7 h

1954Hu50: He ion bombardment of ²⁴⁴Cm followed by fast chemical Measured x-rays and determined half-life (2.5 h and ≈3 h)

Other experimental work:

1987Ch30: Measured ²⁴⁹Cf(¹⁶O,¹⁶O 2n) production cross-sections

1987Gr13: Measured ²⁴⁹Cf(¹³⁶Xe,X) production cross-sections

1987We01: Measured ²⁴⁸Cm(¹²⁹Xe,X) and ²⁴⁸Cm(¹³²Xe,X) production cross-sections

Theoretical and systematical studies:

2013Zd01: Calculated half-lives for α and cluster decay using a phenomenological model based on Gamow theory

2012Ni16: Calculated α decay T_1/2 for transitions from ground-state to favored rotational bands using Multicluster Channel Model.

2012Zh01: Comparison of the low-lying one-quasineutron band for n=149 isotones between the experimental values and calculated values using the cranked shell model (CSM) with pairing correlations

2011Ad15,2010Ad17: One-quasiparticle levels using the microscopic-macroscopic modified TCSM, QPM and the self-consistent SHFB approaches

2011Ha06: Systematic analysis of experimental work in n=149 isotones

2011Zh36: Systematics and calculated partial half life of α decay to members of favored band. Accurate expressions are proposed for the evaluation of partial half-lives of these transitions based on microscopic quantum tunneling theory.

2010Ni02: Systematics and calculations of T_1/2 and relative intensities of α decay within the generalized density-dependent cluster model.

2006Sh19: Calculated energy levels of ground-state rotational band in n=149 isotones

2005Pa73: Calculated neutron one-quasiparticle states of heaviest nuclei within a macroscopic-microscopic approach.

2002Du16: Calculated partial half-lives for α and cluster decays

1997Mo25: Calculated ground-state binding energy, proton and neutron pairing gaps, neutron and proton separation energies, Q values and partial half-lives for α and β decays

1995Mo29,1980Ho32: Calculated ground-state masses and nuclear ground-state deformations

1993Bu09: Calculated partial α decay half-life, α branching, and nuclear radius using the cluster model predictions

1985Lo17: Calculation of spontaneous fission half-life of ground-state.

1981Mo24: Calculated ground-state electric multipole moments Q₂, Q₄ and masses

1980Ho32: Calculated fission-barrier heights, deformation and energy at saddle-point were.

Q(β-)=-2475 keV 25	S(n)= 6059 keV 15	S(p)= 5150 keV 60	Q(α)= 6495 keV 15
Reference: 2012Wa38

E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
0.0	A B	(7/2+)	3.11 h 3 % ε = 99.965 5 % α = 0.035 5
55.00 11	A	(9/2+)		55.0 2	100	M1+E2	0.0	(7/2+)
122.09 11	A	(11/2+)		67.1 2 122.1 2	100 18 100 18	M1+E2 E2	55.00 0.0	(9/2+) (7/2+)
201.0 4	A	(13/2+)
383.2 3	A	(5/2+)		383.2 3	100	M1	0.0	(7/2+)
427.2 4	A	(7/2+)		44.0 4 372.2 4			383.2 55.00	(5/2+) (9/2+)
480.40 9	A	(9/2-)		358.3 1 425.4 1 480.4 1	33.0 21 100 6 41.1 21	E1 E1 E1	122.09 55.00 0.0	(11/2+) (9/2+) (7/2+)
531.99 21	A	(11/2-)		51.4 4 331.0 3 410.0 3 477.0 3	65 13 93 13 100 15		480.40 201.0 122.09 55.00	(9/2-) (13/2+) (11/2+) (9/2+)
551.0 10	A	(11/2+)		496 1	100		55.00	(9/2+)
595 4	A	(13/2-)
634 5	A	(13/2+)
678.0 6	A	(7/2-)		623.0 8 678.0 8	27 8 100 23		55.00 0.0	(9/2+) (7/2+)
738.0 8	A	(9/2-)		616 1 683 1	≈100 ≈80		122.09 55.00	(11/2+) (9/2+)

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 1 - 7/2[624] band. α=6.1.
0.0	(7/2+)	3.11 h 3 % ε = 99.965 5 % α = 0.035 5
55.00 11	(9/2+)		55.0 2	100	M1+E2	0.0	(7/2+)
122.09 11	(11/2+)		67.1 2 122.1 2	100 18 100 18	M1+E2 E2	55.00 0.0	(9/2+) (7/2+)
201.0 4	(13/2+)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 2 - 5/2[622] band. α=5.9.
383.2 3	(5/2+)
427.2 4	(7/2+)		44.0 4 372.2 4			383.2 55.00	(5/2+) (9/2+)
551.0 10	(11/2+)		496 1	100		55.00	(9/2+)
634 5	(13/2+)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 3 - 9/2[734] band. α=4.8
480.40 9	(9/2-)
531.99 21	(11/2-)		51.4 4 331.0 3 410.0 3 477.0 3	65 13 93 13 100 15		480.40 201.0 122.09 55.00	(9/2-) (13/2+) (11/2+) (9/2+)
595 4	(13/2-)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 4 - 7/2[743] band. α=6.7
678.0 6	(7/2-)
738.0 8	(9/2-)		616 1 683 1	≈100 ≈80		122.09 55.00	(11/2+) (9/2+)

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Mixing Ratio	Conversion Coefficient	Additional Data
55.00	(9/2+)		55.0 2	M1+E2	0.51 5	122	α=122 11
122.09	(11/2+)		67.1 2	M1+E2	0.45 10	50	α=50 8
122.09	(11/2+)		122.1 2	E2		9.12	α=9.12
383.2	(5/2+)		383.2 3	M1		0.943	α=0.943
480.40	(9/2-)		358.3 1	E1		0.0319	α=0.0319
	(9/2-)		425.4 1	E1		0.0225	α=0.0225
	(9/2-)		480.4 1	E1		0.0178	α=0.0178

E(level)	J^π(level)	T_1/2(level)	Comments
0.0	(7/2+)	3.11 h 3 % ε = 99.965 5 % α = 0.035 5	Branchings were determined by 1984Ah02 from measured α and Cm K x-ray intensity ratio of 4.7×10^-4 5; the K x-ray intensity was taken as 72.3 per 100 ε decays. E(level): Branchings were determined by 1984Ah02 from measured α and Cm K x-ray intensity ratio of 4.7×10^-4 5; the K x-ray intensity was taken as 72.3 per 100 ε decays. 7/2[624] band. α=6.1.
55.00	(9/2+)		E(level): 7/2[624] band. α=6.1.
122.09	(11/2+)		E(level): 7/2[624] band. α=6.1.
201.0	(13/2+)		E(level): 7/2[624] band. α=6.1.
383.2	(5/2+)		E(level): 5/2[622] band. α=5.9.
427.2	(7/2+)		E(level): 5/2[622] band. α=5.9.
480.40	(9/2-)		E(level): 9/2[734] band. α=4.8.
531.99	(11/2-)		E(level): 9/2[734] band. α=4.8.
551.0	(11/2+)		E(level): 5/2[622] band. α=5.9.
595	(13/2-)		E(level): 9/2[734] band. α=4.8.
634	(13/2+)		E(level): 5/2[622] band. α=5.9.
678.0	(7/2-)		E(level): 7/2[743] band. α=6.7.
738.0	(9/2-)		E(level): 7/2[743] band. α=6.7.