New strongly deformed proton emitter: <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>117</mn></mrow></msup></mrow><mi mathvariant="normal">La</mi></math></span>

F. Soramel; A. Guglielmetti; L. Stroe; L. Müller; R. Bonetti; G. L. Poli; F. Malerba; E. Bianchi; A. Andrighetto; J. Y. Guo; Z. C. Li; E. Maglione; F. Scarlassara; C. Signorini; Z. H. Liu; M. Ruan; M. Ivaşcu; C. Broude; P. Bednarczyk; L. S. Ferreira

doi:10.1103/PhysRevC.63.031304

Rapid Communication

New strongly deformed proton emitter: $^{117} La$

F. Soramel, A. Guglielmetti, L. Stroe, L. Müller, R. Bonetti, G. L. Poli, F. Malerba, E. Bianchi, A. Andrighetto, J. Y. Guo, Z. C. Li, E. Maglione, F. Scarlassara, C. Signorini, Z. H. Liu, M. Ruan, M. Ivaşcu, C. Broude, P. Bednarczyk, and L. S. Ferreira

Phys. Rev. C 63, 031304(R) – Published 14 February 2001

Abstract

The decay by proton emission of the $^{117} La$ nucleus has been studied via the 310 MeV $^{58} Ni +^{64} Zn$ reaction. The nucleus has two levels that decay to the ground state of $^{116} Ba$ with $E_{p} = 783 (6)$ keV ${(T}_{1 / 2} = 22 (5)$ ms] and $E_{p} = 933 (10)$ keV $[T_{1 / 2} = 10 (5)$ ms]. Calculations performed for a deformed proton emitter reproduce quite well the experimental results confirming that $^{117} La$ is strongly deformed $(β_{2} \sim 0.3)$ . Spin and parity of the two p-decaying levels have been determined as well: ${3 / 2}^{+}$ for the ground state and ${9 / 2}^{+}$ for the $E_{x} = 151 (12)$ keV excited state.

Received 3 October 2000

DOI:https://doi.org/10.1103/PhysRevC.63.031304

Authors & Affiliations

F. Soramel¹, A. Guglielmetti², L. Stroe^3,4, L. Müller³, R. Bonetti², G. L. Poli², F. Malerba², E. Bianchi², A. Andrighetto³, J. Y. Guo^3,6, Z. C. Li^3,6, E. Maglione³, F. Scarlassara³, C. Signorini³, Z. H. Liu^5,6, M. Ruan^5,6, M. Ivaşcu⁴, C. Broude⁷, P. Bednarczyk⁸, and L. S. Ferreira⁹

¹Dipartimento di Fisica and INFN, University of Udine, via delle Scienze 208, I-33100 Udine, Italy
²Istituto di Fisica Generale and INFN, University of Milano, via Celoria 16, I-20133 Milano, Italy
³Dipartimento di Fisica and INFN, University of Padova, via Marzolo 8, I-35131 Padova, Italy
⁴NIPNE, P.O. Box MG-6, R.O.-76900 Bucharest - Magurele, Romania
⁵INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Padova, Italy
⁶CIAE, P.O. Box 275(10), Beijing 102413, People’s Republic of China
⁷Weizmann Institute of Science, P.O. Box 26, 76100 Rehovot, Israel
⁸IFJ, ul. Radzikowskiego 152, 31-342 Kraków, Poland
⁹Centro de Física das Interacções Fundamentais, 1096 Lisboa, Portugal

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Vol. 63, Iss. 3 — March 2001

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Physical Review C

covering nuclear physics