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Determining the role of non-axial deformation on proton decays; DPUNS - A Differential Plunger for Unbound Nuclear States.

确定非轴向变形对质子衰变的作用；

基本信息

批准号：
ST/G008787/1
负责人：
David Matthew Cullen
金额：
$ 38.28万
依托单位：
University of Manchester
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2009
资助国家：
英国
起止时间：
2009 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=ST%2FG008787%2F1
关键词：
Determining role non axial deformation

项目摘要

This grant will further our understanding of one of the fundamental limits of nuclear stability. As more and more protons are added to a nucleus there comes a point at which the nucleus can no longer hold on to the last proton. This point is called the proton drip line. The last proton will usually be re-emitted in a very short time, on the scale of milliseconds or microseconds, after it has been absorbed. Nevertheless, excited states which decay by gamma-ray emission, on a picosecond time scale, can still exist in proton-unbound nuclei. In this grant we will characterise these excited states by building a new detector, DPUNS, which will uniquely allow the measurement of their lifetimes. This in turn permits, for the first time, the determination of the shapes of proton-unbound nuclei. Since the proton emission half-life depends sensitively on the shape of the nucleus, a consistent understanding of proton decay is our objective. This proposal contains a collaborative aspect with some of the world's experts in proton decays. Together, we will perform new calculations with unique new data to examine the role of asymmetric nuclear shapes on the proton emission rates and thereby, learn about the binding of the nuclear force. This is a challenging proposal which has the potential to bring about a step change in our ability to investigate nuclear structure beyond the proton drip line.

这笔赠款将进一步加深我们对核稳定性的基本限制之一的理解。当越来越多的质子加入到原子核中时，原子核就不能再抓住最后一个质子了。这一点被称为质子滴线。最后一个质子通常会在很短的时间内重新发射，在毫秒或微秒的尺度上，在它被吸收之后。尽管如此，在皮秒时间尺度上通过伽马射线发射而衰变的激发态仍然可以存在于质子未结合的核中。在这项资助中，我们将通过建造一个新的探测器DPUNS来探测这些激发态，这将是唯一允许测量它们寿命的探测器。这反过来又允许，第一次，确定的形状质子未绑定的核。由于质子发射半衰期敏感地依赖于核的形状，一致的理解质子衰变是我们的目标。这项建议包括与世界上质子衰变方面的一些专家进行合作。我们将一起使用独特的新数据进行新的计算，以研究不对称核形状对质子发射率的作用，从而了解核力的结合。这是一个具有挑战性的建议，它有可能使我们研究质子滴线以外的核结构的能力发生一步变化。