New excited states in {sup 82}Ge: Possible weakening of the N=50 closed shell

Journal Article · Wed Aug 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.76.027302· OSTI ID:21062013

RzaPca-Urban, T; Urban, W; Durell, J L; Smith, A G; Ahmad, I ^[1]

---

1. Faculty of Physics, University of Warsaw, ul. Hoza 69, PL-00-681 Warsaw (Poland)

Excited states in {sup 82}Ge, populated in the spontaneous fission of {sup 248}Cm, have been studied by means of prompt {gamma} spectroscopy, using the EUROGAM2 multidetector array. The known level at 2287 keV is assigned spin and parity 4{sup +}. Two new excited levels in {sup 82}Ge, with spins and parities 5,6{sup +}, are proposed at 2930 and 3228 keV. At least one of the new levels is expected to be be due to neutron excitations across the N=50 shell gap. Its low energy, as compared to heavier N=50 isotones, supports the suggestion of other works that the N=50 shell closure is weakening when approaching the expected double shell closure at {sup 78}Ni.

• OSTI ID: 21062013
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 76; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CURIUM 248
EXCITATION
EXCITED STATES
GAMMA SPECTROSCOPY
GERMANIUM 82
ISOTONIC NUCLEI
KEV RANGE
NEUTRONS
NICKEL 78
NUCLEAR STRUCTURE
PARITY
PROMPT GAMMA RADIATION
SHELL MODELS
SPIN
SPONTANEOUS FISSION