ISOLDE Workshop and Users meeting 2012

A Systematic Study of Nuclei in the A=60 -70 Mass Region

17 Dec 2012, 18:05

1h 25m

503/1-001 - Council Chamber (CERN)

Poster Poster session

Speaker

Paula R. P. Allegro (Instituto de Física, Universidade de São Paulo, São Paulo, Brazil and Dipartimento di Fisica e Astronomia dell’Università and INFN, Sezione di Padova, I-35131, Padova, Italy)

Description

One of the most reliable models to describe the nucleus is the Large Scale Shell Model, which has demonstrated to reproduce with very good accuracy detailed nuclear properties (see ref. [1] for a review). In the A=50-80 mass region, many studies have been published attempting to explain the role of the 0g9/2 orbital in the high spin states, especially in the neutron-rich nuclei like, for example, 59-66Fe [2], 65,67Cu [3], 70,80Ge [4,5] and the odd-mass isotopes of As, Ge and Ga [6]. Two different studies have investigated the role of the 0g9/2 orbital in neutron-rich odd-mass Ga isotopes. In ref. [7] band-like structures, where a proton is excited to the 0g9/2 shell are studied. In ref. [8] the importance of this orbital in describing the change in structure along the Ga isotopic chain is shown. More recently, the role of the 1d5/2 orbital has been discussed by Lenzi et al. [9]. Not that far for stability, the role of both 0g9/2 and 1d5/2 orbitals has still to be investigate. In particular, this is put in evidence in the odd and odd-odd-mass nuclei. Recently, the high spin excited states of odd-odd 64,66,68,70Ga have been studied with in-beam gamma-ray spectroscopy experiments performed at University of São Paulo using the SACI-PERERE [10] spectrometer and at Florida State University using the Clover Array System [11]. In this work, we investigate the role of the 0g9/2 and 1d5/2 orbitals in these Ga isotopes by means of Large Scale Shell Model calculations using the Antoine code [12] and three different residual interactions: FPG [13], JUN45 [14] and LNPS [9]. This has been done in the framework of a systematic study of odd-mass Zn, Ga and Ge nuclei in the mass A= 60-70 region. [1] E. Caurier et al., Rev. of Mod. Phys. 77, 427 (2005). [2] S. Lunardi. et al., Phys. Rev. C 76, 034303 (2007). [3] C. J. Chiara et al., Phys. Rev. C 85, 024309 (2012). [4] M. Sugawara et al., Phys. Rev. C 81, 024309 (2010). [5] H. Iwasaki.et al., Phys. Rev. C 78, 021304(R) (2008). [6] N. Yoshinaga et al. Phys. Rev. C 78, 044320 (2008). [7] I. Stefanescu et al., Phys. Rev. C 79, 064302 (2009). [8] B. Cheal et al. Phys. Rev. Lett. 104, 252502 (2010). [9] S. M. Lenzi et al., Phys. Rev. C 82, 054301 (2010). [10] J.A. Alcántara-Núñez, Nucl. Instr. and Meth. A 497, 429 (2003). [11] Web site: http://www.physics.fsu.edu/nuclear/foxlab/nuclear-foxlab.html (2012). [12] E. Caurier and F. Nowacki, Acta Phys. Polonica B 30, 705 (1999). [13] O. Sorlin et al., Phys. Rev. Lett. 88, 092501 (2002). [14] M. Honma et al., Phys. Rev. C 80, 064323 (2009).