Shape Coexistence and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">N</mml:mi><mml:mi mathvariant="italic"/><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>28</mml:mn><mml:mn/></mml:math>Shell Closure Far from Stability
F. SarazinGANIL, BP 5027, F-14076 Caen Cedex 05, FranceH. SavajolsGANIL, BP 5027, F-14076 Caen Cedex 05, FranceW. MittigGANIL, BP 5027, F-14076 Caen Cedex 05, FranceF. NowackiLaboratoire de Physique Théorique, F-67084 Strasbourg Cedex, FranceN. A. OrrLPC, ISMRA et Université de Caen, F-14050 Caen Cedex, FranceZhizhou RenGANIL, BP 5027, F-14076 Caen Cedex 05, FranceP. Roussel‐ChomazGANIL, BP 5027, F-14076 Caen Cedex 05, FranceG. AugerGANIL, BP 5027, F-14076 Caen Cedex 05, FranceD. BaiborodinNuclear Physics Institute, ASCR, 250 68 Řež, Czech RepublicA. V. BelozyorovC. BorceaE. CaurierIRES, Université Louis Pasteur, BP 28, F-67037 Strasbourg Cedex 2, FranceZ. DlouhýNuclear Physics Institute, ASCR, 250 68 Řež, Czech RepublicA. GillibertCEA/DSM/DAPNIA/SPhN, CEN Saclay, F-91191 Gif-sur-Yvette, FranceA. S. LallemanGANIL, BP 5027, F-14076 Caen Cedex 05, FranceM. LewitowiczGANIL, BP 5027, F-14076 Caen Cedex 05, FranceS. M. LukyanovF. de Oliveira SantosGANIL, BP 5027, F-14076 Caen Cedex 05, FranceY. PenionzhkevichD. RidikasGANIL, BP 5027, F-14076 Caen Cedex 05, FranceH. SakuraïRIKEN, Wako, Saitama 351-01, JapanO. TarasovA. de VismesGANIL, BP 5027, F-14076 Caen Cedex 05, France
2000lv
ABI
Abstract
The masses of 31 neutron-rich nuclei in the range $A\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}29--47$ have been measured. The precision of 19 masses has been significantly improved and 12 masses were measured for the first time. The neutron-rich Cl, S, and P isotopes are seen to exhibit a change in shell structure around $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}28$. Comparison with shell model and relativistic mean field calculations demonstrate that the observed effects arise from deformed prolate ground state configurations associated with shape coexistence. Evidence for shape coexistence is provided by the observation of an isomer in ${}^{43}\mathrm{S}$.
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