Summary
We have re-examined the decay of the 16-minute isomer182Tam in order both to look for hitherto undetected transitions and to obtain further evidence on the multipolarities of the already known ones. We have measured γ-ray and conversion-electron spectra. In agreement with a previous result by Sunyar and Axel we have found that the decay scheme of the isomer involves three states at excitation energies of (147.0±0.3), (319.1±0.6), (504.6±1.2) keV. If the ground-state activation cross-section is taken as 21 barn, the corresponding value for the isomer is (13±2) mb. The half-life isT1/2=(15.84±0.10) min. We have further attempted to fit all the presently known data on182Ta in a single level scheme. The experimental results obtained by the decay of the isomer and by181Ta(d, p) reactions have been compared with the predictions of the unified model. The relative positions of the rotational bands in182Ta are strongly affected by the properties of the effective (n, p) residual interaction introduced in the calculation.
Riassunto
È stato studiato il decadimento dell’isomero da 16 min del182Tam mediante spettroscopia γ e di elettroni di conversione, nel tentativo di rivelare nuove transizioni e di determinare le multipolarità di quelle già note. Viene confermato che lo schema di decadimento coinvolge tre stati eccitati alle energie di (147.0±0.3), (319.1±0.6) e (504.6±1.2) keV. La sezione d’urto per attivazione dello stato metastabile risulta essere (13±2) mb; il periodo di dimezzamento (15.84±0.10) min. Si è tentato di costruire lo schema dei livelli del182Ta utilizzando tutti i dati attualmente disponibili; i risultati sperimentali ottenuti dal decadimento dello stato metastabile e dalle reazioni181Ta(d, p) vengono confrontati con le previsioni del modello unificato. I calcoli mostrano che le posizioni relative delle diverse bande rotazionali sono fortemente dipendenti dall’interazione residua fra i due nucleoni dispari.
Similar content being viewed by others
References
J. R. Erskine andW. W. Buechner:Phys. Rev.,133, B 370 (1964).
G. A. Bartholomew, P. J. Campion, J. W. Knowles andG. Manning: TID 7547, 259 (1957).
A. W. Sunyar andP. Axel:Phys. Rev.,121, 1158 (1961).
Nuclear Data Sheets,60, 1, 126.
L. V. Groshev, A. M. Demidov, V. N. Lutsenko andV. I. Pelekhov:Atlas of γ-rays spectra from radiative capture of thermal neutrons (London, 1959).
G. L. Struble, J. Kern andR. K. Sheline:Phys. Rev.,137, B 772 (1965).
See for example the paper byGallagher inVerhaar:Selected topics in nuclear spectroscopy (Amsterdam, 1964).
P. Nunberg andD. Prosperi:Nuovo Cimento,40 B, 318 (1965).
A. Isoya:Phys. Rev.,130, 234 (1963).
H. Daniel, J. Huefner, T. H. Lorenz, O. W. B. Schult andU. Gruber:Nucl. Phys.,56, 147 (1964).
J. Wing, B. A. Swartz andJ. R. Huizenga:Phys. Rev.,123, 1354 (1961).
Nuclear Data Sheets,5, 5, 141 (1963).
Nuclear Data Sheets,6, 6, A 5.
B. R. Mottelson andS. G. Nilsson:Mat. Fys. Skr. Dan. Vid. Selsk.,1 n. 8 (1959).
J. De Boer andJ. D. Rogers:Phys. Lett.,3, 304 (1963).
G. Monsonego andR. Piepenbring: inComptes Rendus du Congrès International de Physique Nucléaire, vol.2 (Paris, 1964), p. 533.
Author information
Authors and Affiliations
Additional information
Supported in part by Euratom/CNEN-INFN Contract No. 002-11-MPAI.
Rights and permissions
About this article
Cite this article
Bizzarri, B., Nunberg, P. & Prosperi, D. Rotational bands in182Ta. Nuovo Cimento B (1965-1970) 46, 13–34 (1966). https://doi.org/10.1007/BF02710634
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02710634