NRV: Decay of excited nuclei

Quantity to calculate: Decay widths Survival Probability

Nucleus Spin J, h

E_excitation, MeV min max points

Default parameters

Decay properties	1	1	1	1
g.s. deformation β₂
g.s. shell correction δE
g.s. mass excess δM
saddle point β₂
fission barrier B_fiss

Level-density parameter:

Moment of inertia:

Collective enhancement of level density

K_coll=K_rot(E)·φ(β₂)+K_vib(E)·(1-φ(β₂)) [4]

K_coll=K_rot(E) (deformed nuclei case)

K_coll=K_vib(E) (spherical nuclei case)

Deformation dependence of collective enhancement

	β₂⁰
	Δβ₂

Energy dependence of collective enhancement

	E_cr MeV
	ΔE_cr MeV

K_rot= ·

	K_vib=exp( A^2/3T^4/3) [5]
	K_vib= ·β_eff²· [6]
	β_eff= + ΔN + ΔZ
	ΔN (ΔZ) are the absolute values of the numbers of neutrons (protons) above or below nearest shell closure

Monte-Carlo simulation (all possible channels)
Multifold integration (1n-4n channels)

[1] - P. Möller, et al., Atomic Data and Nuclear Data Tables, 2016, vol.109-110, p.1
[2] - M. Wang, et al. Chinese Physics C 36 (2012), p.1603.
[3] - A.V. Ignatyuk, et al., Sov. J. Nucl. Phys., 1975, vol.21, p.612; ibid., p.255
[4] - V.I. Zagrebaev, et al., Phys. Rev., 2001, vol.C65, p.014607
[5] - A.V. Ignatyuk, The statistical properties of the excited atomic nuclei
(Energoatomizdat, Moscow, 1983)
[6] - A.R. Junghans, et al., Nucl. Phys., 1998, vol.A629, p.635