Average angular momentum in compound nucleus reactions deduced from isomer ratio measurements

CAPURRO, O.A.; DIGREGORIO, D.E.; GIL, S.; ABRIOLA, D.; DI TADA, M.; FERNÁNDEZ NIELLO, J.O.; MACCHIAVELLI, A.O.; MARTÍ, G.V.; PACHECO, A.J.; TESTONI, J.E.; TOMASI, D.; URTEAGA, I.

PHYS. REV. - C

AMER PHYSICAL SOC

Año: 1997 vol. 55 p. 766 - 774

0556-2813

We have measured the ratio of the yields for the metastable and ground states of [Formula Presented]Te produced in the fusion-evaporation reactions [Formula Presented]Pd[Formula Presented]C,3[Formula Presented] and [Formula Presented]In[Formula Presented]Li,3[Formula Presented] by off-line observation of delayed [Formula Presented]-ray emission. The absolute cross sections for the formation of the metastable [Formula Presented] = 11/2[Formula Presented], [Formula Presented] = 4.68 d) and ground [Formula Presented] = 1/2[Formula Presented], [Formula Presented] = 16.05 h) states were determined at energies close to the Coulomb barrier for both systems. We have deduced the average angular momentum from these isomer ratio measurements through statistical model calculations. The deduced mean angular momentum agrees quite well with those calculated by a simple fusion model. The expected constant value of the average total angular momentum at subbarrier energies was confirmed for the [Formula Presented]C+[Formula Presented]Pd system. The predicted variation of the mean orbital angular momentum with the reduced mass of the entrance channel was also verified. © 1997 The American Physical Society.